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System Simulator >
System Component Models >
Modulators >
Amplitude Modulator (AMMOD)

Amplitude Modulator (AMMOD)

Property	Description	Units	Default	Range
FC	Carrier frequency	Hz	1000000	[0, Inf)/Real
P	Carrier power	Watt	0	[0, Inf)/Real
REF	Input signal voltage level for 100 percent AM	Volt	1	[-1e6, 1e6]/Real
TYPE	Type of AM modulator (optional): 1: Conventional AM modulator 2: Suppressed carrier	None	1	[1, 2]/Integer
RIN	Input impedance	Ohm	Inf	(0, Inf]
ROUT	Output impedance	Ohm	0	[0, Inf)
Ports
Input	Input signal (complex)
Output	Output of amplitude modulator (complex)

Notes

1. This model performs amplitude modulation (AM). The input to this model is assumed to be a baseband signal v_in(t). The output is an amplitude modulated bandpass signal with a carrier frequency FC and a carrier power P.

There are two different types of amplitude modulation. The output in-phase and quad-phase envelopes are given as follows, respectively

1.TYPE = 1 for conventional AM modulation
v_out,i(t) = A · (1 + v_in(t)/REF)
v_out,q(t) = 0

2.TYPE = 2 for suppressed carrier
v_out,i(t) = A · v_in(t)/REF
v_out,q(t) = 0

A = SQRT(8 · ROUT · P) for FC < input sampling rate/2 (i.e., sampled carrier output)

A = SQRT(4 · ROUT · P) for FC > input sampling rate/2 (i.e., complex envelope output)

Netlist Form

AMMOD:Name n1 n2 FC=val P=val REF=val [TYPE=val][Rin=Val] [Rout=Val]

Netlist Example

AMMOD:1 1 2 FC=1MHz P=0.002W RFE=1mV TYPE=1

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