AGC_Amp (Voltage-Controlled Amplifier for AGC loops)
Symbol
Available in ADS
Parameters
Name |
Description |
Units |
Default |
|---|---|---|---|
ZRef |
Reference resistance for all ports |
Ohm |
50 |
S11 |
Forward reflection coefficient, use x + j × y, polar(x,y), dbpolar(x,y), vswrpolar(x,y) for complex value |
None |
polar(0,0) |
S22 |
Reverse reflection coefficient, use x + j × y, polar(x,y), dbpolar(x,y), vswrpolar(x,y) for complex value |
None |
polar(0,180) |
Min_dB |
Minimum gain; occurs when _v3 = Min_dB volt |
dB |
−40 |
Max_dB |
Maximum gain; occurs when _v3 = Max_dB volt |
dB |
40 |
NF |
Noise Figure [NF mode used for NFmin=0] |
dB |
0 |
SOI |
Second Order Intercept |
dBm |
1000 |
TOI |
Third Order Intercept |
dBm |
1000 |
Range of Usage
ZRef > 0
| Sij | > 0 (ij=11; 22)
Min_dB < Max_dB
NF ≥ 0 dB
Notes/Equations
- AGC_Amp is a voltage-controlled amplifier with user-defined input and output reflection coefficients, minimum and maximum gain limits, and nonlinearity.
- This component uses internal components TwoPort, Noisy2Port, AmplifierVC, and Amplifier2, as shown in the schematic.
- Control voltage at pin 3 is used to set gain. Under small signal conditions, gain in dB as a function of the control voltage at port 3: _v3 is:
Gain_dB = max( Min_dB, min( Max_dB, _v3)) - The input impedance at pin 3 is infinite.
- Regarding NF, component noise parameters (NFmin, Rn, Sopt) are related to NF by setting NFmin=NF, Sopt=0, and Rn=max( ZRef/4 × (10NF/10-1), tinyreal), where tinyreal is an internal simulator value for the smallest real value allowed.
- Regarding SOI and TOI, AGC_Amp must be output-matched in order to validate SOI and TOI.
By default, SOI and TOI are blank resulting in no nonlinearity. TOI can be set without setting SOI; if SOI is set, TOI must be set.
For more information about SOI and TOI, refer to Amplifier2 documentation. - AGC_Amp is required for defining AGC control loops in designs to be simulated with Budget Controller. Such Budget simulation requires AGC_PwrControl; refer to AGC_PwrControl for AGC control loop usage details.
- Example designs demonstrating AGC_Amp in AGC control loops are located in ADS; access the designs from the ADS Main window: File > Example Project > Tutorial > RF_Budget_Examples_prj ; see Budget_AGC.dsn and AGC_loop_CE_test.dsn .