RMWB11001

RMWB11001 June 2004 RMWB11001 11 GHz Buffer Amplifier MMIC General Description The RMWB11001 is a 2-stage GaAs MMIC amplifier designed as a 10.5 to 11.7 GHz Buffer Amplifier for use in point to point and point to multi-point radios, and various communications applications. In conjunction with other Fairchild RF amplifiers, multipliers and mixers it forms part of a complete 38 GHz transmit/receive chipset. The RMWB11001 utilizes our 0.25µm power PHEMT process and is sufficiently versatile to serve in a variety of medium power amplifier applications. Features • • • • • 4 mil substrate Small-signal gain 21dB (typ.) Saturated Power Out 19dBm (typ.) Voltage Detector Included to Monitor Pout Chip size 2.0mm x 1.3mm Device Absolute Ratings Symbol Vd Vg Vdg ID PIN TC TSTG RJC Parameter Positive DC Voltage (+4V Typical) Negative DC Voltage Simultaneous (Vd–Vg) Positive DC Current RF Input Power (from 50Ω source) Operating Baseplate Temperature Storage Temperature Range Thermal Resistance (Channel to Backside) Ratings +6 -2 8 104 +8 -30 to +85 -55 to +125 180 Units V V V mA dBm °C °C °C/W ©2004 Fairchild Semiconductor Corporation RMWB11001 Rev. C RMWB11001 Electrical Characteristics (At 25°C), 50Ω system, Vd = +4V, Quiescent Current (Idq) = 36mA Parameter Frequency Range Gate Supply Voltage1 (Vg) Gain Small Signal (Pin = -10dBm) Gain Variation vs. Frequency Power Output Saturated: (Pin = 2dBm) Drain Current at Psat (Pin = 2dBm) Power Added Efficiency (PAE): at Psat Input Return Loss (Pin = -10dBm) Output Return Loss (Pin = -10dBm) Noise Figure Detector Voltage (Pout = +18dBm) Note: 1: Typical range of gate voltage is -0.8 to 0.2V to set typical Idq of 36mA. Min 10.5 18 17 Typ -0.5 21 Max 11.7 0.5 19 55 35 13 18 4 0.5 Units GHz V dB dB dBm mA % dB dB dB V Functional Block Diagram1 Drain Supply Drain Supply Vd1 Vd2 MMIC Chip RF IN RF OUT Ground (Back of Chip) Gate Supply Vg Output Power Detector Voltage Vdet Note: 1: Detector delivers approx. 0.5V DC into 3kΩ load resistor for > +18dBm output power. If output power level detection is not desired, do not make connection to detector bond pad. ©2004 Fairchild Semiconductor Corporation RMWB11001 Rev. C RMWB11001 Figure 1. Chip Layout and Bond Pad Locations 0.0 0.11 1.3 0.577 2.0 1.3 1.145 0.873 0.873 0.720 0.720 0.567 0.567 0.106 0.0 0.0 0.5 0.65 1.828 2.0 0.0 Chip Size is 2.0mm x 1.3mm X 100µm. Back of chip is RF and DC Ground. Figure 2. Recommended Application Schematic Circuit Diagram Drain Supply Vd=+4 V L = Bond Wire Inductance L 10,000pF 100pF L 100pF L L RF IN RF OUT MMIC Chip L Ground (Back of Chip) L 100pF L 100pF 3 kΩ Note : Detector delivers approx. 0.5V DC into 3kΩ load resistor for >+18 dBm output power. If output power level detection is not desired, do not make connection to detector bond pad. Gate Supply Vg ©2004 Fairchild Semiconductor Corporation 10,000pF Output Power Detector Voltage Vdet RMWB11001 Rev. C RMWB11001 Figure 3. Recommended Assembly Diagram Vd (Positive) 10,000pF 100pF 100pF 5mil Thick Alumina 50Ω 5 mil Thick Alumina 50Ω Die-Attach 80Au/20Sn RF Input RF Output 100pF 2 mil Gap 10,000pF Vg (Negative) 100pF 3KΩ L< 0.015” (4 Places) Vdet (Positive) Notes: Use 0.003" by 0.0005" Gold Ribbon for bonding.RF input and output bonds should be less than 0.015" long with stress relief. Detector delivers approx. 0.5V DC into 3 kΩ load resistor for >+18 dBm output power. If output power level detection is not desired do not make connection to detector bond pad. Application Information CAUTION: THIS IS AN ESD SENSITIVE DEVICE. Chip carrier material should be selected to have GaAs compatible thermal coefficient of expansion and high thermal conductivity such as copper molybdenum or copper tungsten. The chip carrier should be machined, finished flat, plated with gold over nickel and should be capable of withstanding 325°C for 15 minutes. Die attachment should utilize Gold/Tin (80/20) eutectic alloy solder and should avoid hydrogen environment for PHEMT devices. Note that the backside of the chip is gold plated and is used as RF and DC ground. These GaAs devices should be handled with care and stored in dry nitrogen environment to prevent contamination of bonding surfaces. These are ESD sensitive devices and should be handled with appropriate precaution including the use of wrist grounding straps. All die attach and wire/ribbon bond equipment must be well grounded to prevent static discharges through the device. Recommended wire bonding uses 3 mils wide and 0.5 mil thick gold ribbon with lengths as short as practical allowing for appropriate stress relief. The RF input and output bonds should be typically 0.012" long corresponding to a typical 2 mil gap between the chip and the substrate material. Recommended Procedure for Biasing and Operation CAUTION: LOSS OF GATE VOLTAGE (Vg) WHILE DRAIN VOLTAGE (Vd) IS PRESENT MAY DAMAGE THE AMPLIFIER CHIP. The following sequence of steps must be followed to properly test the amplifier: Step 1: Turn off RF input power. Step 2: Connect the DC supply grounds to the ground of the chip carrier. Slowly apply negative gate bias supply voltage of -1.5V to Vg. Step 3: Slowly apply positive drain bias supply voltage of +4V to Vd. Step 4: Adjust gate bias voltage to set the quiescent current of Idq = 36mA. Step 5: After the bias condition is established, the RF input signal may now be applied at the appropriate frequency band. Step 6: Follow turn-off sequence of: (i) Turn off RF input power, (ii) Turn down and off drain voltage (Vd), (iii) Turn down and off gate bias voltage (Vg). ©2004 Fairchild Semiconductor Corporation RMWB11001 Rev. C RMWB11001 Performance Data RMWB11001, 11GHz Buffer Amplifier, Typical Performance On-wafer Measurements, Vd=4V, Idq=36mA 25 S21 20 S21 (dB) 15 S11 10 S22 5 0 9.5 -20 -25 12 -15 -5 S11, S22 (dB) -10 S21 (dB) 0 30 20 10 0 -10 -20 -30 -40 -15 -50 -60 0 5 10 15 20 25 Frequency (GHz) 30 35 10 10.5 11 Frequency (GHz) 11.5 -20 40 S11 S22 -5 -10 S21 5 S11, S22 (dB) 0 RMWB11001, 11GHz Buffer Amplifier, Typical Performance, Vd=4V, Idq=36mA Chip Bonded into 50Ω Test Fixture 10 RMWB11001, 11GHz Buffer Amplifier, Typical Performance, Vd=4V, Idq=36mA Chip Bonded into 50Ω Test Fixture 25 Output Power (dBm), Gain (dB) Detector DC Voltage (V) 1 0.9 20 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 4 0 10.5 RMWB11001, 11GHz Buffer Amplifier, Typical Performance, Vd=4V, Idq=36mA Detector Voltage into 3kΩ load at Pout=+18dBm 15 Pout @ 10.5GHz Gain @ 10.5GHz Pout @ 11.1GHz Gain @ 11.1GHz Pout @ 11.7GHz Gain @ 11.7GHz -12 -8 -4 Input Power (dBm) 0 10 5 -16 10.7 10.9 11.1 11.3 Frequency (GHz) 11.5 11.7 20 19 18 17 16 15 10.75 Output Power at 3dB Compression (dBm) RMWB11001, Typical Performance Variation with Temperature, Vd=4V, Idq=36mA, Chip Bonded into 50Ω Test Fixture 21 Gain at 3dB Compression (dB) RMWB11001, Typical Performance Variation with Temperature, Vd=4V, Idq=36mA, Chip Bonded into 50Ω Test Fixture 19 18 17 16 11 11.25 11.5 Frequency (GHz) 11.75 12 15 10.75 11 11.25 11.5 Frequency (GHz) 11.75 12 ©2004 Fairchild Semiconductor Corporation RMWB11001 Rev. 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A critical component is any component of a life 1. Life support devices or systems are devices or support device or system whose failure to perform can systems which, (a) are intended for surgical implant into be reasonably expected to cause the failure of the life the body, or (b) support or sustain life, or (c) whose support device or system, or to affect its safety or failure to perform when properly used in accordance with instructions for use provided in the labeling, can be effectiveness. reasonably expected to result in significant injury to the user. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Product Status Formative or In Design Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. Preliminary First Production No Identification Needed Full Production Obsolete Not In Production This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only. Rev. I11