HMC1044LP3E
v01.0712
Programmable Harmonic Filters - SMT
Programmable Harmonic Low Pass Filter
1 - 3 GHz 3 dB BANDWIDTH
Typical Applications
Features
The HMC1044LP3E is ideal for wideband transceiver
harmonic filtering applications including:
Programmable Bandwidth: 1 to 3 GHz
• Filtering LO Harmonics to Reduce Modulator
Sideband Rejection & Demodulator Image Rejection
• Amplifier Harmonic Filtering
Compatible with Narrowband & Wideband:
• PLLs with Integrated VCOs
• Modulators
• Demodulators
• RF Filtering
LO Harmonic Rejection: ~20 dB
Improves Modulator/Demodulator Sideband/Image
Rejection Performance: 20 dB Typical
Single-Ended or Differential Options
Footprint up to 90% Smaller than Current Discrete
Fixed Bandwidth Solutions
16 Lead 3x3 mm SMT Package
Functional Diagram
General Description
The HMC1044LP3E is a programmable bandwidth
LPF (Low Pass Filter) targeted at all applications that
use quadrature modulators and/or demodulators. The
HMC1044LP3E filters out LO harmonics and ensures
little or no LO contribution to modulator sideband
rejection or demodulator image rejection performance.
Although targeted at LO filtering applications, the
HMC1044LP3E can be used to filter all RF harmonics
such as the ones generated by amplifiers.
The HMC1044LP3E offers a choice of 16
programmable bands, optimized for high and low
cellular bands ranging from 1 to 3 GHz, making the
HMC1044LP3E a truly wideband part compatible with
wideband PLLs with Integrated VCOs and wideband
quadrature modulators and demodulators. It enables
wideband multi-standard, multi-carrier designs that
are field configurable on-the-fly for each individual
application.
The HMC1044LP3E is packaged in a compact
3x3 mm QFN leadless package.
1
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For price, 2delivery,
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responsibility
is assumed
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Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are
the property of their
respective owners.
Application
Support:
Phone: 978-250-3343
or apps@hittite.com
HMC1044LP3E
v01.0712
Programmable Harmonic Low Pass Filter
1 - 3 GHz 3 dB BANDWIDTH
Parameter
Min.
Typ.
Max.
Units
Single-Ended
Passband[1]
250
3060
MHz
ƒcutoff[2] Tuning Range (3 dB Loss)
1025
3060
MHz
5
dB
Passband Flatness
2.5
Passband Insertion Loss
3
dB
Return Loss
10
dB
Input/Output Impedance
50
Ω
Input IP3 (inband)
43
dBm
Differential
Passband [1]
250
ƒcutoff[2]
970
Tuning Range (3 dB Loss)
Passband Flatness
3400
MHz
3400
MHz
5
dB
2.5
Passband Insertion Loss
3
dB
Return Loss
10
Input/Output Impedance
100
dB
Ω
Input IP3 (inband)
43
dBm
Supplies
DC Supply
3
Supply Current
3.3
3.5
1
V
uA
Digital Inputs
Digital Input Low Level (VIL)
Digital Input High Level (VIH)
0.4
1.5
V
V
[1] Minimum frequency is limited by external DC blocking capacitor. Displayed value corresponds to default evaluation board configuration of
100 pF.
[2] ƒcutoff defined as the point at which the insertion loss is 3 dB below the passband insertion loss @ 500 MHz.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, 2delivery,
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orders: Analog MA
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and
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responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are
the property of their
respective owners.
Application
Support:
Phone: 978-250-3343
or apps@hittite.com
Programmable Harmonic Filters - SMT
Electrical Specifications, TA = +25 °C, V3 = 3.3 V (3 V to 3.5 V)
2
HMC1044LP3E
v01.0712
Programmable Harmonic Low Pass Filter
1 - 3 GHz 3 dB BANDWIDTH
Figure 1. Single-Ended Insertion Loss [1]
Figure 2. Differential Insertion Loss [1]
0
0
High Bands
-5
-5
Band 8
INSERTION LOSS (dB)
INSERTION LOSS (dB)
Band 8
-10
-15
Band 0
-20
-25
Low Bands
-30
-10
-15
Band 0
-20
-25
Low Bands
Band 15
-30
Band 15
Band 7
-35
Band 7
-35
-40
-40
0
1000
2000
3000 4000 5000 6000
FREQUENCY (MHz)
7000
8000
9000
Figure 3. Single-Ended Insertion Loss
Over Supply Voltage [1]
0
1000
2000
3000 4000 5000 6000
FREQUENCY (MHz)
0
Band 7
8000
9000
-20
-30
Band 8
Band 15
Band 15, 3 V, 3.3 V & 3.5 V
INSERTION LOSS (dB)
INSERTION LOSS (dB)
Band 8, 3 V, 3.3 V & 3.5 V
-10
7000
Figure 4. Single-Ended Insertion Loss
Over Temperature [1]
0
-10
-20
Band 0
-30
Band 0, 3 V, 3.3 V & 3.5 V
25 C
-40
-40
85 C
-40 C
Band 7, 3 V, 3.3 V & 3.5 V
-50
-50
0
1000
2000
3000 4000 5000 6000
FREQUENCY (MHz)
7000
8000
0
9000
Figure 5. Single-Ended Return Loss [1]
0
0
-5
-5
-10
-15
-20
Band0
Band7
Band8
Band15
-25
1000
2000
3000 4000 5000 6000
FREQUENCY (MHz)
7000
8000
2000
3000 4000 5000 6000
FREQUENCY (MHz)
7000
8000
9000
-10
-15
-20
Band0
Band7
Band8
Band15
-25
-30
0
1000
Figure 6. Differential Return Loss [1]
RETURN LOSS (dB)
RETURN LOSS (dB)
Programmable Harmonic Filters - SMT
High Bands
9000
-30
0
1000
2000
3000 4000 5000 6000
FREQUENCY (MHz)
7000
8000
9000
[1] Low frequency performance limited by external DC blocking capacitors at RF input and output.
3
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, 2delivery,
and to
placeChelmsford,
orders: Analog MA
Devices,
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delivery
and
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orders:
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01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are
the property of their
respective owners.
Application
Support:
Phone: 978-250-3343
or apps@hittite.com
HMC1044LP3E
v01.0712
Programmable Harmonic Low Pass Filter
1 - 3 GHz 3 dB BANDWIDTH
Figure 7. Single-Ended
Return Loss vs. V3[1]
Figure 8. Single-Ended
Return Loss vs. Temperature[1]
0
-5
-10
Band 15, 3 V,3.3 V & 3.5 V
-15
Band 8, 3 V, 3.3 V & 3.5 V
-20
RETURN LOSS (dB)
-5
RETURN LOSS (dB)
Band 7
Band 0
Band 0, 3 V, 3.3 V & 3.5 V
-10
-15
Band 15
Band 8
-20
25 C
85 C
-40 C
-25
-25
Band 7, 3 V, 3.3 V & 3.5 V
-30
-30
0
1000
2000
3000 4000 5000 6000
FREQUENCY (MHz)
7000
8000
9000
0
1000
2000
3000 4000 5000 6000
FREQUENCY (MHz)
7000
8000
9000
Figure 9. Single-Ended Filter Group Delay[1]
0.8
Band 0
0.7
GROUP DELAY (ns)
Band 8
Band 7
Band 15
0.6
0.5
0.4
0.3
0
500
1000
1500
2000
2500
3000
3500
4000
FREQUENCY (MHz)
Programmable Harmonic Filters - SMT
0
[1] Low frequency performance limited by external DC blocking capacitors at RF input and output.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, 2delivery,
and to
placeChelmsford,
orders: Analog MA
Devices,
Inc.,
For price,
delivery
and
to place
orders:
Microwave
Corporation,
Elizabeth
Drive,
01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are
the property of their
respective owners.
Application
Support:
Phone: 978-250-3343
or apps@hittite.com
4
HMC1044LP3E
v01.0712
Programmable Harmonic Low Pass Filter
1 - 3 GHz 3 dB BANDWIDTH
HMC1044LP3E Frequency Bands
Programmable Harmonic Filters - SMT
HMC1044LP3E Band Setting
5
Typical 3 dB Cutoff Frequency Relative to 500 MHz
Single-Ended
Differential
0
1025
970
1
1050
1000
2
1075
1030
3
1105
1055
4
1130
1085
5
1160
1120
1155
6
1195
7
1225
1195
8
2230
2335
9
2300
2430
10
2380
2530
11
2465
2655
12
2550
2770
13
2675
2940
14
2805
3145
15
3060
3400
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, 2delivery,
and to
placeChelmsford,
orders: Analog MA
Devices,
Inc.,
For price,
delivery
and
to place
orders:
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Corporation,
Elizabeth
Drive,
01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are
the property of their
respective owners.
Application
Support:
Phone: 978-250-3343
or apps@hittite.com
HMC1044LP3E
v01.0712
Programmable Harmonic Low Pass Filter
1 - 3 GHz 3 dB BANDWIDTH
Parameter
V3
Reliability Information
Rating
-0.3 to +3.6 V
Maximum Junction Temperature
125 °C
Operating Temperature
-40 to +85 °C
RF Power Input
18 dBm
ESD Rating (HBM)
Class 2
Digital Input Voltage Range
-0.3 to +3.6 V
Thermal Resistance
90 °C/W
Storage Temperature
-65 to +150 °C
Reflow Soldering
Peak Temperature
260 °C
Time at Peak Temperature
40 sec
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Outline Drawing
NOTES:
[1] PACKAGE BODY MATERIAL: LOW STRESS INJECTION MOLDED PLASTIC
SILICA AND SILICON IMPREGNATED.
[2] LEAD AND GROUND PADDLE MATERIAL: COPPER ALLOY.
Programmable Harmonic Filters - SMT
Absolute Maximum Ratings
[3] LEAD AND GROUND PADDLE PLATING: 100% MATTE TIN.
[4] DIMENSIONS ARE IN INCHES [MILLIMETERS].
[5] LEAD SPACING TOLERANCE IS NON-CUMULATIVE.
[6] PAD BURR LENGTH SHALL BE 0.15 mm MAX. PAD BURR HEIGHT SHALL BE
0.05 mm MAX.
[7] PACKAGE WARP SHALL NOT EXCEED 0.05 mm
[8] ALL GROUND LEADS AND GROUND PADDLE MUST BE SOLDERED TO PCB
RF GROUND.
[9] REFER TO HITTITE APPLICATION NOTE FOR SUGGESTED PCB LAND PATTERN.
Package Information
Part Number
Package Body Material
Lead Finish
HMC1044LP3E
RoHS-compliant Low Stress Injection Molded Plastic
100% matte Sn
MSL Rating
MSL1
[2]
Package Marking [1]
1044
XXXX
[1] 4-Digit lot number XXXX
[2] Max peak reflow temperature of 260 °C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, 2delivery,
and to
placeChelmsford,
orders: Analog MA
Devices,
Inc.,
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and
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orders:
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Corporation,
Elizabeth
Drive,
01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
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• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are
the property of their
respective owners.
Application
Support:
Phone: 978-250-3343
or apps@hittite.com
6
HMC1044LP3E
v01.0712
Programmable Harmonic Low Pass Filter
1 - 3 GHz 3 dB BANDWIDTH
Pin Descriptions
Programmable Harmonic Filters - SMT
Pin Number
7
Function
Description
1, 4, 5, 6, 7, 8, 9, 12
GND
These pins and exposed paddle
must be connected to RF/DC ground.
2
OUT_N
3
OUT_P
10
IN_P
11
IN_N
13
SEN
Serial Port Enable (CMOS) Logic Input
14
SCK
Serial Port Clock (CMOS) Logic Input
15
SDI
Serial Port Data (CMOS) Logic Input
16
V3
DC Power Supply
Interface Schematic
This pin is DC coupled and matched to 50 Ohms.
External voltage must not be applied to this pin. [1]
This pin is DC coupled and matched to 50 Ohms.
External voltage must not be applied to this pin. [1]
This pin is DC coupled and matched to 50 Ohms.
External voltage must not be applied to this pin. [1]
This pin is DC coupled and matched to 50 Ohms.
External voltage must not be applied to this pin. [1]
[1] Although the pins are DC coupled they require external AC coupling for proper operation. Please refer to Evaluation PCB Schematic for more
information.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, 2delivery,
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orders:
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Corporation,
Elizabeth
Drive,
01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are
the property of their
respective owners.
Application
Support:
Phone: 978-250-3343
or apps@hittite.com
HMC1044LP3E
v01.0712
Programmable Harmonic Low Pass Filter
1 - 3 GHz 3 dB BANDWIDTH
The circuit board used in the application should use RF circuit design techniques. Signal lines should have 50
Ohms impedance while the package ground leads and exposed paddle should be connected directly to the
ground plane similar to that shown. A sufficient number of via holes should be used to connect the top and
bottom ground planes. The evaluation circuit board shown is available from Hittite upon request.
Programmable Harmonic Filters - SMT
Evaluation PCB
Evaluation Order Information
Item
Contents
Part Number
Evaluation PCB Only
HMC1044LP3E Evaluation PCB
EVAL01-HMC1044LP3E
Evaluation Kit
HMC1044LP3E Evaluation
PCB USB Interface Board
6’ USB A Male to USB B Female Cable
CD ROM (Contains User Manual, Evaluation PCB Schematic, Evaluation Software)
EKIT01-HMC1044LP3E
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For price, 2delivery,
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orders: Analog MA
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orders:
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Drive,
01824
responsibility
is assumed
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Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
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Application
Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are
the property of their
respective owners.
Application
Support:
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8
HMC1044LP3E
v01.0712
Programmable Harmonic Low Pass Filter
1 - 3 GHz 3 dB BANDWIDTH
9
2
1
REVISIONS
REV
ECN#
ZONE
1
QC111299
-----
ENGINEERINGRELEASE
CP120371
----
PRODUCTIONRELEASE
A
DESCRIPTION
NAME
DATE
D. ACEVAL
20/10/2011
D. ACEVAL
03/05/2012
3.3V
R1
SSW-106-01-T-D
B
SCK
SD1
3.3V
TP2
2
3
4
5
6
7
8
9
3
C3
J4
0.001UF
C5
10UF
B
12
4
SEN 13
SCK 14
SPI
GND
U1
0.001UF
GND
OUT_N
IN_N
OUT_P
IN_P
GND
GND
GND
J2
12
C1
11
10
C2
9
J3
A
0.001UF
8 GND
2
SDI 15
V3 16
C4
1
5 GND
0.001UF
0
0.1UF
7 GND
C6
3.3V
R2
0
10
J1
C7
6 GND
1K
J5
GND
1
11
10UF
A
SEN
FB1
3.3V
NOTICEOF PROPRIETARYPROPERTY: THISDOCUMENT ANDTHEINFORMATIONCONTAINEDINIT ARETHEPROPRIETARYPROPERTY
OF HITTITEMICROWAVECORPORATION. IT MAYNOT BECOPIEDINANYMANNERNORMAYANYOF THEINFORMATIONINORUPONIT BEUSED
FORANYPURPOSEWITHOUT THEEXPRESSEDWRITTENCONSENT OF ANAUTHORIZEDAGENT OF HITTITEMICROWAVECORPORATION.
Programmable Harmonic Filters - SMT
Evaluation PCB Schematic
HMC1044LP3E
HITTITEMICROWAVECORPORATION
TP1
20 Alpha Rd Chelmsford, MA01824
TITLE
SCH, CUSTOMEREVALUATION
PROJECT
DRAWING#:
HMC1044LP3E
DRAWNBY
2
130-00329-00
D. ACEVAL
1
DATE
SHEET
SHEET 1 OF 1
CODEIDNO.
01/01/2010
SIZE
1CN88
REV
A
A
15-03-2012_13:47
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, 2delivery,
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orders: Analog MA
Devices,
Inc.,
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delivery
and
to place
orders:
Microwave
Corporation,
Elizabeth
Drive,
01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are
the property of their
respective owners.
Application
Support:
Phone: 978-250-3343
or apps@hittite.com
HMC1044LP3E
v01.0712
Programmable Harmonic Low Pass Filter
1 - 3 GHz 3 dB BANDWIDTH
The HMC1044LP3E is an ideal LO harmonic filter for wideband applications featuring quadrature modulators and/or
demodulators. The HMC1044LP3E’s 16 user programmable bands enable the user to optimally attenuate 2nd and/
or 3rd LO harmonics in order to maximize quadrature modulator/demodulator sideband/image rejection performance.
Typical diagrams with the HMC1044LP3E are shown in Figure 10 and Figure 11.
Figure 10. Typical HMC1044LP3E transmitter application
Figure 11. Typical HMC1044LP3E receiver application
Background, LO Harmonics and Modulator/Demodulator Sideband/Image Rejection
Most wideband quadrature modulators/demodulators in the market use some form of a filter to create the required
in-phase and quadrature LO components at the fundamental frequency of the LO (1xLO). Others, less common
modulators/demodulators accept LO input at 2xLO frequency and are not based upon filters. The 1xLO types are
particularly sensitive to LO 3rd harmonic levels, while the 2xLO types are more sensitive to 2nd harmonic levels.
Programmable Harmonic Filters - SMT
HMC1044LP3E Application Information
Harmonics are normally present in all VCOs and especially in RFICs with integrated VCOs. High LO harmonic content
causes amplitude and phase mismatches, and ultimately performance degradation in modulator sideband rejection
and demodulator image rejection, as shown in Figure 12.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, 2delivery,
and to
placeChelmsford,
orders: Analog MA
Devices,
Inc.,
For price,
delivery
and
to place
orders:
Microwave
Corporation,
Elizabeth
Drive,
01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are
the property of their
respective owners.
Application
Support:
Phone: 978-250-3343
or apps@hittite.com
10
HMC1044LP3E
v01.0712
Programmable Harmonic Low Pass Filter
1 - 3 GHz 3 dB BANDWIDTH
hmc701 Sweeper Plot 11:18:12 AM 3/19/2012
MODULATOR SIDEBAND REJECTION (dBc)
Programmable Harmonic Filters - SMT
0
-10
Targeted minimum LO harmonic level
-20
Targeted maximum modulator
sideband rejection
-30
-40
3rd LO Harmonic
-50
-60
2nd LO Harmonic
-70
-80
-80
-70
-60
-50
-40
-30
-20
-10
0
LO HARMONIC LEVEL (dBc)
Figure 12. Typical impact of 2nd and 3rd LO harmonic on modulator sideband rejection.[1]
Figure 12 shows a typical modulator with 1xLO input, where both the 2nd and 3rd LO harmonics affect the modulator
sideband rejection performance at levels > -20 dBc relative to the LO signal power. It also shows that the 3rd LO
harmonic has greater impact on modulator sideband rejection performance than the 2nd, and that there is little effect
of the 2nd LO harmonic on modulator sideband rejection once the 2nd LO harmonic is below -20 dBc levels, relative
to the LO signal level.
The HMC1044LP3E is designed to ensure that the 2nd and the 3rd LO harmonics are below -20 dBc relative to the
LO signal level across the entire operating range of Hittite’s wideband PLLs with integrated VCOs. Thereby ensuring
little or no LO contribution is added to modulator/demodulator sideband/image rejection performance degradation.
Using the HMC1044LP3E
Modulator/demodulator sideband/image rejection performance is specific to each individual modulator/demodulator,
and depends on a number of other variables including: type (1xLO or 2xLO input), balance (amplitude and phase
matching), signal path matching and interface to other components, board layout, input signal bandwidth, and LO
harmonics.
Figure 12 shows that typically the LO harmonics stop being a dominant contributor to modulator/demodulator
sideband/image rejection performance degradation once they are below approximately -20 dBc relative to the LO
signal level. However, the exact level at which harmonics cease being the dominant contributor to sideband/image
rejection performance depends on each individual modulator/demodulator and each individual design. Hence, the
optimal band selection of the HMC1044LP3E may be different for different designs.
Figure 13 shows optimal 3rd harmonic attenuation achieved with the HMC1044LP3E without optimizing the 2nd
harmonic, when the HMC830LP6GE PLL with Integrated VCO is used as an LO to drive the HMC697LP4E quadrature
modulator. The corresponding HMC1044LP3E band selections are shown in Figure 14.
[1] Measured with HMC697LP4E direct modulator at 2 GHz, with LO input power = 0 dBm, 1xLO type.
11
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for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
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HMC1044LP3E
v01.0712
Programmable Harmonic Low Pass Filter
1 - 3 GHz 3 dB BANDWIDTH
16
0
-10
12
-20
-30
SELECTED BAND
HARMONIC LEVEL (dBc)
14
3rd LO Harmonic
2nd LO Harmonic
Targeted Harmonic Levels
-40
8
6
4
Filtered
-50
-60
500
10
2
0
1000
1500
2000
2500
3000
500
1000
1500
2000
2500
3000
LO FREQUENCY (MHz)
LO FUNDAMENTAL FREQUENCY (MHz)
Figure 13. Maximum HMC1044LP3E attenuation of 3rd harmonic of the
LO[2]
Figure 14. HMC1044LP3E band selection corresponding to
Figure 13
Observing the results shown in Figure 13 in the context of targeted performance in Figure 12; It is apparent that the
HMC1044LP3E attenuates both the 3rd and the 2nd LO harmonics to well below the targeted maximum LO harmonic
level shown in Figure 12, ensuring that the targeted modulator sideband rejection performance is achieved.
Figure 15 shows the optimal 2nd harmonic attenuation achieved with the HMC1044LP3E, when the HMC830LP6GE
PLL with Integrated VCO is used as an LO to drive the HMC697LP4E quadrature modulator. The corresponding
HMC1044LP3E band selection is shown in Figure 16.
20
0
Unfiltered
3rd LO Harmonic
2nd LO Harmonic
15
-20
Targeted Harmonic Levels
-30
-40
-50
-60
500
SELECTED BAND
HARMONIC LEVEL (dBc)
-10
10
5
0
Filtered
-5
1000
1500
2000
2500
LO FUNDAMENTAL FREQUENCY (MHz)
Figure 15. Maximum HMC1044LP3E attenuation of 2nd
harmonic of the LO [2]
3000
500
1000
1500
2000
2500
3000
LO FREQUENCY (MHz)
Figure 16. HMC1044LP3E band selection corresponding to
Figure 15
Programmable Harmonic Filters - SMT
Unfiltered
Observing the results shown in Figure 15 in the context of the targeted performance in Figure 12; it is apparent that the
HMC1044LP3E attenuates both the 3rd and the 2nd LO harmonics to well below the targeted maximum LO harmonic
level shown in Figure 12, ensuring that the targeted modulator sideband rejection performance shown in Figure 12 is
achieved.
Using the relationship between sideband/image rejection vs. LO harmonic distortion in Figure 12 as a reference, it can
be observed that both approaches (maximizing 2nd harmonic attenuation in Figure 13, and maximizing 3rd harmonic
attenuation in Figure 14) achieve sideband/image rejection performance improvement, and effectively remove any
LO contribution to sideband/image rejection performance degradation. However, Figure 12 suggests that, when using
a 1xLO type modulator, more emphasis should be placed on attenuating the 3rd harmonic than the second because
the 2nd harmonic ceases to be a contributor at levels ~
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