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System Simulator >
System Component Models >
Miscellaneous >
Voltage Controlled Amplifier (VCA)

Voltage Controlled Amplifier (VCA)

Property	Description	Units	Default	Range/Type
G	Gain of amplifier	None	1	(-Inf, Inf)/Real
FORMAT_G	Format of gain: 0 for linear scale, 1 for dB	None	0	[0, 1]/Integer
RIN1	Input1 impedance	Ohm	Inf	(0, Inf]/Real
RIN2	Input2 impedance	Ohm	Inf	(0, Inf]/Real
ROUT	Output impedance	Ohm	0	[0, Inf)/Real
Ports
Input1	Input1 signal (Complex)
Input2	Input2 signal (Complex)
Output	Output signal (Complex)

Notes

1. This model performs voltage-controlled amplification. The gain of the amplifier could be a function of the control voltage determined by an equation given in G. The control voltage is represented by _V2

_V2 = V₂_I ^. cos (2pf_2ct) - V₂_Q^.sin (2pf_2ct),

where V₂_I+ jV₂_Q is the voltage complex envelope at the second input port, and f_2c is its carrier frequency. The output carrier frequency equals to the carrier frequency of the first input signal. The voltage complex envelope at the output port (V₃_I+jV₃_Q) is calculated by
V₃_I ⁺V₃_Q= GAIN ^. (V₁_I+ V₁_Q).

Where, V₁_I+ jV₁_Q is the voltage complex envelope at the first input port, and GAIN is calculated by the given equation G.

2. Case 1: The default equation format
If FORMAT_G isn’t specified, then GAIN = G. For example, if G = (10+_V2) and if FORMAT_G isn’t specified, then GAIN=(10+_V2).

3. Case 2: The dB format:
If FORMAT_G is set to 1, then the equation is calculated in dB. For example, if
G = (10 +_V2) and FORMAT_G = 1, then

Netlist Form

VCA:Name n1 n2 n3 G=(equation) [FORMAT_G=val] [Rin1=val] [Rin2=val] [Rout=val]

Netlist Example

VCA:1 1 2 3 G=(-10+ V2) FORMAT_G=1

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