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Ansoft Designer / Ansys Designer 在线帮助文档：

System Simulator >
System Component Models >
Demodulators >
   Frequency Demodulator (FMDEM)       

Frequency Demodulator (FMDEM)

 

 


Property

Description

Units

Default

Range/Type

SEN

Frequency demodulation sensitivity, in voltage units per Hz

None

0

[-1e6 1e6]/Real

PHAS

Carrier phase offset

Deg

0

[-180, 180]/Real

RIN

Input impedance

Ohm

Inf

(0, Inf]/Real

ROUT

Output impedance

Ohm

0

[0, Inf)/Real

Ports

Input

The input FM modulated signal (complex)

Output

The output of FM demodulator (complex)

 

Notes

1. This model performs FM demodulation. The input to this model is assumed to be an FM mod­ulated bandpass signal with in-phase and quad-phase envelopes vin,i(t) and vin,q(t). The output is a baseband signal. The output quad-phase is 0, and the in-phase signal is given as follows

vout,i(t) = SEN · (I(t) · d[Q(t)]/dt - Q(t) · d[I(t)]/dt) / (2p ·(I(t)2 + Q(t)2)) 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

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

Netlist Example

FMMOD:1 1 2 SEN=1.2 PHAS=90DEG



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