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Ansoft Designer / Ansys Designer 在线帮助文档：

System Simulator >
System Component Models >
Demodulators >
   Synchronous Amplitude Demodulator (AMDEM)       

Synchronous Amplitude Demodulator (AMDEM)

 

 


Property

Description

Units

Default

Range/Type

SEN

Demodulation sensitivity,

in voltage units per volt

None

1V

[-1e6, 1e6)/Real

PHAS

Carrier phase offset

Deg

0

[-180, 180]/Real

TYPE

Type of Synchronous AM demodulator
1: In-phase AM demodulator
2: Quad-phase AM demodulator

None

1

[1, 2]/Integer

RIN

Input impedance

Ohm

Inf

(0, Inf]/Real

ROUT

Output impedance

Ohm

0

[0, Inf)/Real

Ports

Input

The input AM modulated signal (complex)

Output

The output of AM demodulator (complex)

 

Notes

1. This model performs AM demodulation. The input to this model is assumed to be an AM mod­ulated bandpass signal with in-phase and quad-phase envelopes vin,i(t) and vin,q(t). The output is a baseband signal.

There are two different AM demodulators. The output quad-phase is always 0, and the in-phase signal is given as follows, respectively

(1) TYPE = 1 for In-phase AM demodulator, vout,i(t) = SEN · I(t)
(2) TYPE = 2 for Quad-phase AM demodulato, vout,i(t) = SEN · Q(t)

where
I(t) = vin,i(t) · cos(q) + vin,q(t) · sin(q)
Q(t) = -vin,i(t) · sin(q) + vin,q(t) · cos(q)
q = PHAS · p / 180

Netlist Form

AMDEM:Name n1 n2 SEN=val [PHAS=val] [TYPE=val] [Rin=Val] [Rout=Val]

Netlist Example

AMDEM:1 1 2 SEN=1.2 PHAS=0DEG TYPE=1



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