volt_gain()

Returns the voltage gain

Syntax
y= volt_gain(S, Zs, Zl, Zref)

Arguments

Name	Description	Range	Type	Required
S	2 2 scattering matrix measured with equal terminations of Zref		complex	yes
Zs	input impedance	(-∞, ∞)	real, complex	yes
Zl	Output impedance	(-∞, ∞)	real, complex	yes
Zref	reference impedance	(-∞, ∞)	real, complex	yes

Examples

a = volt_gain(S, 50, 75)

Defined in

$HPEESOF_DIR/expressions/ael/circuit_fun.ael

See Also

pwr_gain(), volt_gain_max()

Notes/Equations

This function calculates the ratio of the voltage across the load impedance to the voltage applied at the input port of the network. The network-parameter transformation function stos() can be used to change the normalizing impedance of the scattering matrix.

Signal Flow Diagram used for volt_gain Calculation illustrates the volt_gain measurement.

Signal Flow Diagram used for volt_gain Calculation

1. In the S-parameter simulation setup, the source and load impedances must be identical.
2. For a case of unequal source and load impedances, S-parameter analysis should be performed with identical source and load impedances. Voltage gain can then be computed with the actual source and load impedances as the second and third arguments.
   For example, compute voltage gain with Zs=100 and Zl=50. Perform an S-parameter analysis with both the Zs=Zl=50 ohms. The voltage gain is computed as follows:
   volt_gain(S, 100, 50, 50)
   This expression gives the voltage gain when the source impedance is 100 ohms and the load impedance is 50 ohms. The fourth argument in volt_gain is the reference impedance, which is the value of the Z parameter of the Term components used in the S-parameter analysis.