HMC490

HMC981 v00.0611 ACTIVE BIAS CONTROLLER Typical Applications • Microwave Radio & VSAT • Military & Space • Test Instrumentation • Fiber Optic Modulator Driver Biasing • CATV Laser Driver Biasing • Cellular Base Station • Wireless Infrastructure Equipment Features Automatic Gate voltage adjustment (No Calibration required) Supply Voltage: 4V to 12V Digital Voltage: 3.3V to 5V Controls both Enhancement and Depletion type devices Adjustable Drain Current up to 200mA Sink/Source Gate Current Capability Optional Internal negative voltage generation that can be disabled to use external negative rail Fast Enable/Disable Trigger-out Output for Daisy Chain Power-Up and Power-Down Sequencing 13 BIAS CONTROLLERS - SMT Functional Diagram General Description HMC981 is an active bias controller that automatically adjusts the gate voltage of an external amplifier to achieve constant bias current. It can be used to bias any enhancement and depletion type amplifiers operating in Class-A regime with Drain voltages from 4V to 12V and drain currents up to 200mA, offering a complete biasing solution. HMC981 achieves excellent bias stability over supply, temperature and process variations, and eliminates the required calibration procedures usually employed to prevent RF performance degradation due to such variations. All data shown herein is taken with appropriate probes. 13 - 1 For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com HMC981 v00.0611 ACTIVE BIAS CONTROLLER Electrical Specifications, TA = +25°C, VDD=8V, VDIG= 3.3V, Depletion Master Unless Otherwise Noted Parameter Supply Voltage Symbol Vdd VDD = 4V VDD Quiescent Current IDD VDD = 8V VDIG Quiescent Current Negative Voltage Output Oscillator Frequency Voltage Reference Enable Input Threshold Switch Input Threshold Short Circuit Disable Input Threshold VDRAIN Characteristics DRAIN Current Adjustment Range DRAIN Current Change Over Digital Voltage DRAIN Current Change Over Temperature DRAIN Range VDRAIN Change Over Temperature VNEG Characteristics Negative Voltage Output VNEG Current Sink VGATE Characteristics GATE Current Supply VGATE Low Level VGATE High Level VG2 Characteristics VG2 Current Supply VG2 Adjustment Range VDIG Characteristics Adjustment Range VDIG Quiescent Current SW Characteristics Internal Switch Resistance RDS_ON SW= GND SW=VDIG 10 5 Ohm Ohm VDIG IDIG VDD= 8 V, VDIG=EN =3.3 V 3.3 3 5 V mA IG2 VG2 VG21.5V -0.1 -1 1 0.1 1 VDD-1.3 mA mA V IG VG_MIN VG_MAX -0.8 VNEG VNEG+4.5 0.8 mA V V VNEG INEG VDD= 4V VDD= 8V 0 0 -2.5 8 15 V mA mA IDRAIN SW=GND SW=VDIG VDRAIN set to 8V, IDRAIN set to 160 mA 4 VDRAIN set to 8V, IDRAIN set to 160 mA 1.5 20 80 0.4 0.02 12 80 200 mA mA %/V %/C V %/C IDIG VNEG FOSC VREF ENTHRS SWTHRS DSCTHRS Vinlow Vinhigh Vinlow Vinhigh Vinlow Vinhigh 1.4 1.4 1 1.4 1 EN = VDIG EN = GND EN = VDIG EN = GND Conditions Min. 4 7 3 7.5 4 3 5 -2.5 300 1.42 1 Typ. Max. 12 Units V mA mA mA mA mA mA V kHz V V V V V V V VDIG= 3.3 V VDIG= 5 V 13 BIAS CONTROLLERS - SMT 13 - 2 ΔIDRAINV VDRAIN ΔVDRAIN For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com HMC981 v00.0611 ACTIVE BIAS CONTROLLER Load Regulation @ VDD=6V, VDIG=3.3V, SW=GND 6.5 Load Regulation @ VDD=8V, SW=VDIG=3.3V 8.5 6 8 +25C +85C -55C VDRAIN (V) +25C +85C -55C VDRAIN (V) 5.5 7.5 5 7 4.5 20 30 40 50 IDRAIN (mA) 60 70 80 6.5 80 100 120 140 IDRAIN (mA) 160 180 200 13 BIAS CONTROLLERS - SMT 55 54 IDRAIN vs. VDIG[1][2] VNEG Line Regulation vs. Supply Voltage -2.45 No load condition +25C +85C -55C -2.47 IDRAIN (mA) VNEG (V) +25C +85C -55C 53 -2.49 52 -2.51 51 -2.53 50 3.3 3.7 4.1 VDIG (V) 4.5 4.9 -2.55 4 6 8 SUPPLY VOLTAGE (V) 10 12 VNEG Load Regulation @ VDD=4V -2.3 VNEG Load Regulation @ VDD=12V -2.3 -2.4 -2.4 VNEG (V) VNEG (V) -2.5 -2.5 -2.6 +25C +85C -55C -2.6 +25C +85C -55C -2.7 0 2 4 6 INEG (mA) 8 10 -2.7 0 4 8 INEG (mA) 12 16 [1] IDRAIN is set to 53 mA [2] HMC465LP5 is used as external amplifier 13 - 3 For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com HMC981 v00.0611 ACTIVE BIAS CONTROLLER Enable Waveform 8 6 4 Disable Waveform 8 6 4 VOLTAGE (V) VOLTAGE (V) 2 0 -2 -4 -6 -8 0 2 4 6 TIME (ms) 8 10 12 EN VDRAIN VG2 VNEG VGATE 2 0 -2 -4 -6 -8 12 EN VDRAIN VG2 VNEG VGATE 14 16 TIME (ms) 18 20 13 VDD VDRAIN VDIG VG2 VNEG VGATE 8 6 VDD VDRAIN VDIG VG2 VNEG VGATE 8 6 VOLTAGE (V) VOLTAGE (V) 4 2 0 -2 -4 0 10 4 2 0 -2 -4 20 30 TIME (ms) 40 50 0 20 40 60 TIME (ms) 80 100 VNEG Load Transient VDD=4V -0.8 20 VNEG Load Transient VDD=6V -2.4 -2.425 15 10 5 -1.3 10 -2.45 VNEG (V) VNEG (V) -1.8 0 -2.475 -2.5 -2.525 0 -5 -2.3 -10 -10 -15 0 0.5 1 TIME (ms) 1.5 2 -2.8 0 0.5 1 TIME (ms) 1.5 2 -20 -2.55 For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com 13 - 4 BIAS CONTROLLERS - SMT Power Up Waveform Shutdown Waveform INEG (mA) INEG (mA) HMC981 v00.0611 ACTIVE BIAS CONTROLLER VGATE Load Regulation @ VDD=6V 1 0.5 0 VG2 Load Regulation @ VDD=6V 5 4.5 4 3.5 VGATE (V) VG2 (V) +25C +85C -55C -0.5 -1 -1.5 -2 -2.5 -3 -1.25 -1 -0.75 -0.5 -0.25 0 0.25 0.5 0.75 3 2.5 2 1.5 1 0.5 VG2=0.9V VG2=1.78V VG2=2.74V VG2=3.71V 1 1.25 0 -2 -1.5 -1 -0.5 0 IG2 (mA) 0.5 1 1.5 2 13 BIAS CONTROLLERS - SMT IG (mA) 13 - 5 For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com HMC981 v00.0611 ACTIVE BIAS CONTROLLER Absolute Maximum Ratings [1] VDD VG2_CONT, VDRAIN SW, EN, CP_OUT, VGATEFB, VNEGFB, TRIG_OUT, DISBL_SC, ISENSE VDIG VNEG VG2 Junction Temperature Continuous Pdiss (T = 85 °C) (Derate 19.19 mW/°C above 85 °C) 12V -0.5V to VDD + 0.5V -0.5V to VDIG + 0.5V 5.5V -4V to GND -0.5V to VDD + 0.5V 125 °C 0.77 Watts NOTES: 1. ALL DIMENSIONS IN INCHES [MILLIMETERS] 2. DIE THICKNESS IS 0.010 (0.254) 3. TYPICAL BOND PAD IS 0.0039 SQUARE 4. BOND PAD METALLIZATION: ALUMINUM 5. NO BACKSIDE METAL 6. NO CONNECTION REQUIRED FOR UNLABELED BOND PADS 7. OVERALL DIE SIZE IS ±.002 Thermal Resistance (RTH) (Junction to package bottom) Storage Temperature Operating Temperature ESD Sensitivity (HBM) 52.1 °C/W -65 to +150 °C -55 to +85 °C Class 1B Note that there are two different voltage domains on HMC981; a high voltage domain Vdd, and a low voltage domain VDIG. Take necessary precautions not to violate ABS MAX ratings of each subdomains. Outline Drawing For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com 13 - 6 BIAS CONTROLLERS - SMT ELECTROSTATIC SENSITIVE DEVICE OBSERVE HANDLING PRECAUTIONS 13 HMC981 v00.0611 ACTIVE BIAS CONTROLLER Pad Descriptions Pad Number 1, 5, 8, 10, 13, 15, 20, 23, 25, 26, Die Bottom 2 3 Function Description These pads and the die bottom must be connected to a high quality RF/DC ground. Enable pad. System is enabled when Ven is HIGH (VDIG). If left floating, Ven defaults to HIGH (enabled). Internal switch resistance control pad. If left floating, VSW defaults to HIGH. Interface Schematic GND EN SW 12 DISBLSC Disables short circuit lock down when pulled to ground. Leave it floating to enable short circuit lock down. 13 BIAS CONTROLLERS - SMT 4 VG2CONT Control voltage of the VG2. Use a resistor divider between VDD and GND to set the voltage. VG2 is typically 1.3V lower than the VG2CONT 19 VG2 Second gate control. 6-7, 29-30 VDD, VDIG Bias supply pan. Connect supply voltage to this pad with appropriate filtering. 9 VREF 1.5V reference voltage. 0.1uF or greater capacitor to GND is needed for noise filtering. 11 ISENSE To adjust the bias current of the external amplifier connect a resistor (Rsense) from ISENSE pad to GND. Use Eqn.2 to determine the required Rsense value. 13 - 7 For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com HMC981 v00.0611 ACTIVE BIAS CONTROLLER Pad Descriptions (Continued) Pad Number Function Description Interface Schematic 14 TRGOUT Trigger out signal. Generates a HIGH (3.5V) signal when the active bias system stabilizes. This signal can be used to trigger next device (ENABLE) if more than one HMC981 is used in a daisy chain. 16, 17 VDRAIN Drain voltage. Should be connected to the supply terminal of the external amplifier. A minimum 100 nF capacitor has to be placed close to the external amplifier to improve load regulation. 13 BIAS CONTROLLERS - SMT 13 - 8 18 VGATE Gate Control pad for external amplifier. Connect to the gate (base) of the external amplifier. In order to guarantee stability,a 10μF capacitor should be connected between the gate (base) terminal of the external amplifier and GND as close to the amplifier as possible. 21 VNEG Negative input to the chip. Should be supplied with CPOUT when negative voltage generator is enabled, or connect to external VSS when negative voltage generator is enabled. For detailed usage please refer to the “Negative Voltage Generator” section. Feedback (Control) pad for Negative Voltage Generator Charge Pump. Float to activate the negative voltage generator / Sort to GND to disable the negative voltage generator. Control pad for VGATEFB. Float VGATEFB when a depletion mode transistor is biased. Selects the mode of operation along with VNEGFB pad. For detailed usage please refer to the Table 2. 22 VNEGFB 24 VGATEFB 27, 28 CPOUT Negative voltage generator charge pump output. Negative voltage generator needs a flying capacitor, a reservoir capacitor and two diodes to operate. Please refer to the application schematic for more info. For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com HMC981 v00.0611 ACTIVE BIAS CONTROLLER Application Circuit 13 BIAS CONTROLLERS - SMT Notes: [1] Adjust R10 with respect to equation (2). 13 - 9 For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com HMC981 v00.0611 ACTIVE BIAS CONTROLLER Mounting & Bonding Techniques for MMICs The die should be attached directly to the ground plane with epoxy (see HMC general Handling, Mounting , Bonding Note). Handling Precautions Follow these precautions to avoid permanent damage. Storage: All bare die are placed in either Waffle or Gel based ESD protective containers, and then sealed in an ESD protective bag for shipment. Once the sealed ESD protective bag has been opened, all die should be stored in a dry nitrogen environment. Cleanliness: Handle the chips in a clean environment. DO NOT attempt to clean the chip using liquid cleaning systems. Static Sensitivity: Follow ESD precautions to protect against ESD strikes. Transients: Suppress instrument and bias supply transients while bias is applied. Use shielded signal and bias cables to minimize inductive pick-up. General Handling: The chip may be handled by a vacuum collet or with a sharp pair of tweezers. Mounting Epoxy Die Attach: Apply a minimum amount of epoxy to the mounting surface so that a thin epoxy fillet is observed around the perimeter of the chip once it is placed into position. Cure epoxy per the manufacturer’s schedule. 13 BIAS CONTROLLERS - SMT For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com 13 - 10 HMC981 v00.0611 ACTIVE BIAS CONTROLLER Application Notes Detailed Description The HMC981 is a fully-integrated Active Bias Controller (ABC) that automatically adjusts the gate voltage of amplifiers operating in the Class-A regime. With an internal feedback the automatic gate voltage control achieves constant quiescent bias through the amplifier under bias, independent of temperature and amplifier threshold variations. The quiescent current is adjusted with a resistor connected externally. The HMC981 employs an integrated control circuitry to achieve safe power-up and power-down sequencing of the targeted amplifier. The HMC981 can provide auto-bias solution virtually any amplifier in the market (both enhancement and depletion type) with a quiescent current of up to 200 mA and a supply voltage of up to 12V. The HMC981 has an integrated negative voltage generator to synthesize negative voltages required to drive depletion mode amplifiers. If an external negative supply is already available or an enhancement mode device is targeted, the negative voltage generator can be disabled. The HMC981 achieves excellent bias stability over supply and temperature variations with low supply voltage down to 4V. The gate control can both sink and source current (±0.8 mA) to achieve constant bias current over input power variations applied to the amplifier. The HMC981 also generates a second gate voltage (VG2). VG2 can be adjusted through a resistor divider connected to VDD for amplifiers which require second gate voltage. The HMC981 ensures the protection of the external amplifier during turn on/off by adjusting the sequence of VDRAIN, VGATE and VG2 outputs. HMC981 controls the bias current of the amplifier under bias with the gate control driver. The current passing through the amplifier is continuously sampled and is used to control the VGATE voltage connected to the gate of the amplifier. The HMC981 employs a SW pad to control RDS_ON resistance of the internal switch between VDD and VDRAIN. Refer to the section under the “Supply and Drain Voltage” section for details. The HMC981 has a built-in short circuit protection feature to protect both itself and the amplifier under bias against short circuit conditions at the VDRAIN output. Refer to the section under the “Short Circuit Protection” section for details. 13 BIAS CONTROLLERS - SMT Digital Power Supply (VDIG) The HMC981 requires an external low voltage bias rail (3.3V to 5.0V). VDIG powers the internal logic circuitry. VDIG draws an average of 3 mA from a 3.3V. VDIG can accept voltages up to 5.0V. Supply and Drain Voltage (VDD and VDRAIN) The VDD supply to the HMC981 is directly connected to the VDRAIN output through an internal MOSFET switch. This internal MOSFET is controlled through power-up sequencing which ensures that no voltage is applied to drain of the external amplifier until the gate voltage is pulled down to VNEG(ensuring external amplifier is pinched-off). The VDRAIN output of the HMC981 should be connected to the drain (collector) of the amplifier under bias for the active bias control feedback and power-up/down sequencing to work. 13 - 11 For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com HMC981 v00.0611 ACTIVE BIAS CONTROLLER There will be a voltage drop from VDD to VDRAIN due to finite RDS_ON resistance of the internal switch. To compensate for this voltage drop choose the VDD value as shown in equation (1). VDD = VDRAIN + IDRAIN x RDS_ON (1) where VDRAIN is the supply voltage of the external amplifier and IDRAIN is the desired constant bias current through the external amplifier. Note that RDS_ON resistance of the internal FET switch can be adjusted through SW pad. RDS_ON is typically equal to 5 Ohms when SW is pulled up to VDIG, and is typically equal to 10 Ohms when SW is pulled down to GND. If SW is left floating, it is pulled up to VDIG through an internal weak pull-up. Recommended settings for the SW position are given in Table-1. Not using the HMC981 in the recommended settings will increase the power dissipation of the part and may increase the part-to-part variation. Table 1. Recommended Current Range Configuration Current Range (mA) 20 to 80 80 to 200 Condition SW=GND SW=VDIG RDS_ON (Ohm) 10 5 13 BIAS CONTROLLERS - SMT 13 - 12 Negative Voltage Generator (VNEGOUT) The HMC981 has an internally regulated charge pump block to generate negative voltage (VNEGOUT) required for depletion mode devices. The HMC981 generates -2.5V at the VNEGOUT output in default configuration. It requires two diodes and two capacitors connected externally as shown in the sample application schematics. The HMC981 is designed to reject the ripple on the VNEGOUT by isolating VNEGOUT from the VGATE. The negative voltage is only required for depletion mode devices, and it can be disabled through the VGATEFB and VNEGFB pads. Where an enhancement device is targeted or a negative supply is already available in the system, simply connect the available negative supply to the VNEG pad. See Table-2 for detail on how to set this operation mode. Enable/Disable (EN) The active bias control loop is enabled when EN is pulled up to VDIG, and it is disabled when it is pulled down to GND. If EN is left floating HMC981 is enabled through an internal weak pull-up. Note that VNEG operation is independent of EN condition. EN signal controls the operation of only VGATE, VG2 and VDRAIN outputs. When EN pulled down to GND, the HMC981 discharges VDRAIN and VG2 down to GND and it pulls the VGATE down to VNEG. Please see the “Active Bias Control Loop” section for detailed explanation. Active Bias Control Loop The HMC981 regulates the bias current (IDRAIN) of the amplifier under bias through VGATE output connected to the gate of the external amplifier. In this closed loop operation the current passing through the amplifier under bias is sampled and is used to adjust VGATE to achieve constant quiescent bias through the external amplifier. The HMC981 continuously compensates for any supply, temperature, process variations and threshold drifts due to aging. The part-to-part, temperature, and supply variation of the HMC981 is excellent. Thus, by using an accurate sense resistor connected to the ISENSE pad, expensive calibration procedures in high volume production could be avoided. For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com HMC981 v00.0611 ACTIVE BIAS CONTROLLER The gate control of the HMC981 is designed to both sink and source current in to the gate of the targeted amplifier (at least ±0.8 mA). This unique feature is important to achieve nearly constant quiescent bias through the amplifier under varying gate current at different input power values. The bias current passing through the external amplifier can be adjusted with RSENSE, where RSENSE is the R10 connected from ISENSE to GND. Use the relation given in equation (2) to set the desired bias current through the external amplifier. IDRAIN=32/Rsense (A) (2) Self Protection Feature 13 BIAS CONTROLLERS - SMT Due to the small resistance of the internal switch FET a large amount of current may flow through the HMC981. HMC981 limits the maximum current to protect itself under such fault conditions, by turnung of VDRAIN and VGATE. The HMC981 will remain in this protection mode until a full power-cycle or enable/disable cycle is applied. VNEG Fault Detection Feature In depletion mode operation VNEG is continuously monitored against short circuit fault to GND. If VNEG rises above a preset value (typically -1V) the system and the external amplifier are disabled by pulling VDRAIN and VG2 to GND and VGATE to VNEG. The system will stay in this stand-by mode until short fault at VNEG is fixed. Power-up and Enable Sequencing To ensure the protection of the external amplifier, the HMC981 provides a power-up sequence for enabling active bias control loop. During start-up VDRAIN and VG2 are kept at GND while VGATE is taken to the most negative supply available (VGATE=VNEG). This ensures that external amplifier is completely pinched-off before VDRAIN is applied. When EN signal is received, VDRAIN is applied and the active bias loop is enabled. After the VDRAIN is applied, VG2 is generated. The final phase of the power-up sequence is completed by increasing the VGATE linearly until the set IDRAIN value is achieved. For power-down and disabling the same sequencing is applied in the reverse order. Daisy-Chain Operation HMC981 produces a trigger out signal (TRIGOUT pad#13) when VDRAIN output is enabled. This trigger signal can be used to enable additional HMC981 chips in a chain of amplifiers. The triggering sequence can be routed in any way, from input to output, or from output to input depending on the use. Figure-1 presents a sample use of three HMC981s in an amplification chain. Please note that, only one of the HMC981 is used to generate the negative voltage and the remaining HMC981 is set to receive external negative voltage (which is provided from the master HMC981). Generating negative voltage from a single HMC981 reduces the number of the components in the system, and decreases the over all current consumption.. Please note that, to ensure proper start-up, the system enable signal should be applied to the chip that has the negative voltage generator. 13 - 13 For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com HMC981 v00.0611 ACTIVE BIAS CONTROLLER 13 BIAS CONTROLLERS - SMT 13 - 14 Figure 1. Daisy Chain Operation Operation Modes HMC981 can be configured to bias both enhancement and depletion mode external amplifiers. The mode of operation can be selected by setting two pads (VNEGFB, VGATEFB) as tabulated in Table-2. The connection to the VNEGIN should be adjusted accordingly. In order not to bias external amplifier in a wrong region, please make sure that the correct mode of operation is selected before powering up the HMC981. The HMC981 does not allow the internal negative voltage generator to work if an enhancement mode is selected. Therefore, if VNEGFB is left floating while VGATEFB is grounded, HMC981 will stay in standby mode. Please note that the external negative voltage should be between -2.5V to -3.5V for HMC981 to operate. If your application requires negative voltages outside this range please contact Hittite application support. Table 2 - Mode Selection VNEGFB MODE1 (Depletion/Master Mode) FLOAT VGATEFB FLOAT VNEGIN Connected to VNEGOUT Description Depletion mode transistor. Internal negative voltage generator is active and generates -2.5V. Sample application schematic given shown in Fig.2a. Depletion mode transistor. Internal negative voltage generator is disabled. An external negative voltage less than -2.3V should be connected to VNEGIN. Sample application schematic given shown in Fig.2b. Not allowed. HMC981 stays in standby. Enhancement mode transistor. Internal negative voltage generator is disabled. Sample application schematic given shown in Fig.2c. MODE2 (Depletion/Slave Mode) --MODE3 (Enhancement Mode) GND FLOAT Connected to External VSS N/A Connected to GND FLOAT GND GND GND For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com HMC981 v00.0611 ACTIVE BIAS CONTROLLER 13 BIAS CONTROLLERS - SMT Figure 2a. Depletion/Master Mode Amplifier Typical Application Circuit (Mode 1) Figure 2b. Depletion/Slave Mode Amplifier Typical Application Circuit (Mode 2) 13 - 15 For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com HMC981 v00.0611 ACTIVE BIAS CONTROLLER 13 Table 3 - List of Bias Settings for Various Hittite Amplifiers Hittite Part Number HMC-ALH140 HMC-ALH216 HMC-ALH244 HMC-ALH310 [1] HMC-ALH311[1] HMC-ALH313 [1] HMC-ALH382 [1] HMC-ALH435 HMC-ALH444 HMC-ALH476 HMC490 HMC490LP5 HMC504LC4B HMC594 HMC594LC3B HMC609 HMC609LC4 HMC752LC4[1] HMC753LP4E HMC772LC4 HMC-ABH209 HMC-ABH264 HMC-AUH317 VDRAIN (V) 4 4 4 2.5 2.5 2.5 2.5 5 5 4 5 5 4 6 6 6 6 3 5 4 5 5 4 VDD (V) 4.60 4.45 4.45 3.02 [1] 3.04 [1] 3.02 [1] 3.14 [1] 5.30 5.55 4.45 6.00 6.00 4.45 6.50 6.50 6.85 6.85 3.70 [1] 5.55 4.45 5.80 5.60 4.80 IDRAIN (mA) LNAs 60 90 45 52 54 52 64 30 55 90 200 200 90 100 100 170 170 70 55 45 Linear & Power 80 120 160 0.40 0.27 0.20 open open open open open open 0.53 0.36 0.71 0.62 0.59 0.62 0.50 1.07 0.58 0.36 0.16 0.16 0.36 0.32 0.32 0.19 0.19 0.46 0.58 0.71 open open open open open open open 5.60 5.09 open open open open open open open open open 5.09 open open open open open open open open 5 5 open open open open open open open open open 5 open 1.5 1.5 1.5 RSENSE (kOhm) R2 (kOhm) R1 (kOhm) VG2 (V) [1] For applications below 4V supply please contact factory. For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com 13 - 16 BIAS CONTROLLERS - SMT Figure 2c. Enhancement Mode Amplifier Typical Application Circuit (Mode 3) HMC981 v00.0611 ACTIVE BIAS CONTROLLER Table 3 - List of Bias Settings for Various Hittite Amplifiers (Continued) Hittite Part Number HMC-AUH318 HMC-AUH320 HMC442 HMC442LC3B HMC442LM1 HMC499 HMC499LC4 VDRAIN (V) 4 4 5 5 5 5 5 VDD (V) 4.80 4.65 5.43 5.42 5.43 6.00 6.00 IDRAIN (mA) 160 130 85 84 85 200 200 RSENSE (kOhm) 0.20 0.25 0.38 0.38 0.38 0.16 0.16 R2 (kOhm) open open open open open open open R1 (kOhm) open open open open open open open VG2 (V) - Wideband (Distributed) HMC-ALH482 HMC-AUH232 4 5 5 8 8 8 5 5 5 8 8 8 5 5 5 5 10 7 8 4.45 5.90 6.00 8.60 8.60 8.75 5.60 5.60 5.60 8.80 8.80 8.80 5.90 5.90 5.90 5.90 10.88 7.83 8.38 45 180 200 60 60 75 60 60 60 160 160 80 180 180 180 180 175 165 75 0.71 0.18 0.16 0.53 0.53 0.43 0.53 0.53 0.53 0.20 0.20 0.40 0.18 0.18 0.18 0.18 0.18 0.19 0.43 open 4.52 4.38 2.82 open open open open open 2.33 2.33 open open open open open 3.95 open open open 5 5 5 open open open open open 5 5 open open open open open 5 open open 1.5 1.5 1.8 1.5 1.5 3.5 - 13 BIAS CONTROLLERS - SMT HMC-AUH249 HMC-AUH312 HMC460 HMC460LC5 HMC463 HMC463LH250 HMC463LP5 HMC465 HMC465LP5 HMC562 HMC633 HMC633LC4 HMC634 HMC634LC4 HMC-930 HMC870LC5 HMC871LC5 Microwave & Optical Drivers 13 - 17 For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com HMC981 v00.0611 ACTIVE BIAS CONTROLLER Notes: 13 BIAS CONTROLLERS - SMT For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com 13 - 18