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
- 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.
- 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.