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HMC173MS8 Datasheet(PDF) 5 Page - Hittite Microwave Corporation

Part # HMC173MS8
Description  GaAs MMIC VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz
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Manufacturer  HITTITE [Hittite Microwave Corporation]
Direct Link  http://www.hittite.com
Logo HITTITE - Hittite Microwave Corporation

HMC173MS8 Datasheet(HTML) 5 Page - Hittite Microwave Corporation

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2 - 30
12 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Web Site: www.hittite.com
MICROWAVE CORPORATION
FEBRUARY 2001
2
Part
Description
Manufacturer
AD822
Op-Amp
Analog Devices
R1
10K ohms
Panasonic
R2
200K ohms
Panasonic
R3
7.5K ohms
Panasonic
R4
39K ohms
Panasonic
R5
220K ohms
Panasonic
R6
91K ohms
Panasonic
R7
910 ohms
Panasonic
R8
51 ohms
Panasonic
R9
100 ohms
Panasonic
D1, D2
LL4148 D-35
Digikey
Attenuation Linearizing Control Circuit For The
HMC173MS8 Voltage Variable Attenuator
A driver circuit to improve the attenuation linearity of the HMC173MS8 can be implemented with a simple op-amp
configuration. A breakpoint linearization circuit will scale the voltage supplied to the control line of the HMC173MS8,
so that a more linear attenuation vs. control voltage slope can be achieved. A -5V and +5V supply is required.
Diode and resistor values which define the op-amp gain, and breakpoint were selected to optimize a measured
production lot of attenuators at 825 MHz. R7 may be varied to optimize the performance of any given attenuator. If the
input voltage to the linearizing circuit will not drop below 1.0V, then R9 and D2 may be omitted, and this will greatly reduce
the overall power consumption of the driver circuit.
The linearizing circuit has been optimized for 825 MHz attenuation applications. A similar approach may be used at other
frequencies by adjusting RI - R9 resistor values.
Required Parts List
Schematic
VCTL IN
R5
R8
R6
R1
R7
0
+5
0
3
7
2
D1
-5V
R4
R3
R2
4
AD820/AD
V+
V-
+
_
U3
6
D2
VCTL OUT
R9
+5V
-5V
HMC173MS8 VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz
Attenuation vs. Control Voltage
@ 825 MHz
-60
-50
-40
-30
-20
-10
0
01
2
3
CONTROL VOLTAGE (Vdc)
Without
Linearizer
With
Linearizer
Return Loss vs. Control Voltage
@ 825 MHz
-19
-18
-17
-16
-15
-14
-13
-12
0.5
1
1.5
2
2.5
3
CONTROL VOLTAGE (Vdc)
With
Linearizer
Without
Linearizer
HMC173MS8


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