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Attenuation Linearizing Control Circuit
For The HMC473MS8 / HMC473MS8E Voltage Variable Attenuator
A driver circuit to improve the attenuation linearity of the HMC473MS8 & HMC473MS8E can be implemented with a
simple op-amp confi guration. A breakpoint linearization circuit will scale the voltage supplied to the control line of the
HMC473MS8 & HMC473MS8E, so that a more linear attenuation vs. control voltage slope can be achieved. A -3.3V
and +3.3V supply is required.
Diode and resistor values which defi ne the op-amp gain, and breakpoint were selected to optimize a measured
production lot of attenuators at 0.9 GHz. 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, the 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 0.9 GHz attenuation applications. A similar approach may be used at
other frequencies by adjusting R1 - R9 resistor values.
Required Parts List
Application Circuit
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
Digi-Key
GaAs MMIC VOLTAGE VARIABLE
ATTENUATOR, 0.45 - 2.2 GHz
HMC473MS8 / 473MS8E
v01.1105
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制造商:Hittite Microwave Corp 功能描述:ATTENUATOR VOLT VARIABLE 8MSOP 制造商:Hittite Microwave Corp 功能描述:HMC473 Series 0.45 - 2.2 GHz GaAs MMIC Voltage Variable Attenuator - MSOP-8
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制造商:HITTITE 制造商全称:Hittite Microwave Corporation 功能描述:SiGe HBT GAIN BLOCK MMIC AMPLIFIER, DC - 6.0 GHz
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制造商:HITTITE 制造商全称:Hittite Microwave Corporation 功能描述:SiGe HBT GAIN BLOCK MMIC AMPLIFIER, DC - 6 GHz
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制造商:HITTITE 制造商全称:Hittite Microwave Corporation 功能描述:SiGe HBT GAIN BLOCK MMIC AMPLIFIER, DC - 6 GHz
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制造商:HITTITE 制造商全称:Hittite Microwave Corporation 功能描述:SiGe HBT GAIN BLOCK MMIC AMPLIFIER, DC - 6 GHz
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制造商:Hittite Microwave Corp 功能描述:IC MMIC AMP HBT 6GHZ SC-70-6