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LogTrue (True Logarithmic Amplifier)

Symbol

Available in ADS

Parameters

Name

Description

Units

Default

NumStages

Number of stages

None

5

StageGain

Gain per stage

dB

10

VoltLimit

Limiting voltage of each stage

V

1

Z1

Reference impedance for port 1

Ohm

50

Notes/Equations
  1. LogTrue accepts inputs of either polarity and generates an output whose sign follows that of the input. A progressive compression technique is used, in which the logarithmic response can be approximated through the use of cascaded amplifier stages that have signal-dependent gain.
  2. Several logarithmic amplifiers are available in ADS: LogACDemod, LogDC, LogSuccDetect, and LogTrue. These components accept an RF input and generate a DC output voltage proportional to the log of the input voltage.
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