Model variable gain amplifier
RF Blockset / Circuit Envelope / Elements
The VGA block models a RF Blockset™ variable gain amplifier (VGA). The Simulink® signal controls the non-linear gain.
The three Simulink input ports are
(second-order intercept point), and
IP3 (third-order intercept
point). The port,
In is the RF Blockset voltage input and the port
OUT is RF Blockset voltage output.
Gain — Power gain signal
Power gain signal, specified as a scalar in dB. The power gain signal is a Simulink signal.
IP2 — Second-order intercept point signal
Second-order intercept point signal, specified as a scalar in dBm. The second-order intercept point signal is a Simulink signal.
IP3 — Third-order intercept point signal
Third-order intercept point signal, specified as a scalar in dBm. The third-order intercept point signal is a Simulink signal.
Input impedance (Ohm) — Input impedance of VGA
50 (default) | scalar
Input impedance of the VGA, specified as a scalar in ohms.
Output impedance (Ohm) — Output impedance of VGA
50 (default) | positive scalar
Output impedance of the VGA, specified as a scalar in ohms.
Intercept points convention — Input-referred or output-referred convention
Output (default) |
Input-referred or output-referred convention for IP2 or IP3 intercept
points, specified as
Ground and hide negative terminals — Ground and hide negative terminals
on (default) |
Ground and hide negative terminals, specified as
off. Select this parameter to internally ground and
hide the negative terminals. Clear the option to expose the negative
terminals. By exposing these terminals, you can connect them to other parts
of your model.
VGA output voltage is a function of the
The table shows the formulas for the coefficients, g, c2, and c3
|Input Referred||Output Referred|
Introduced in R2015b