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Ansoft Designer / Ansys Designer 在线帮助文档：

System Simulator >
System Component Models >
Demodulators >
   Logarithmic Detector (LOGDET)       

Logarithmic Detector (LOGDET)

 

 


Property

Description

Units

Default

Range/Type

SEN

Log sensitivity, in voltage units per dB

None

0

[0, Inf)/Real

PL

Low input power

Watt

0W

[1e-23, 1e7]/Real

E

Peak log error, in dB

dB

0

[0, 200]/Real

EC

Log error cycle, in dB

dB

1

[0, 200]/Real

RIN

Input impedance

Ohm

Inf

(0, Inf]/Real

ROUT

Output impedance

Ohm

0

[0, Inf)/Real

Ports

Input

The input signal (complex)

Output

The output signal (complex)

 

Notes

1. This model performs logarithmic detection. The input to this model is assumed to be a 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) = M2(t) where
A1(t) = SQRT(vin,i(t)2 + vin,q(t)2)
M2(t) = 20 · SEN · LOG10(A1(t)/VL)+ SEN · E · sin(q) for A1(t) > VL
M2(t) = 0 for A1(t) £ VL
VL = SQRT(2 · 50 · PL)
q = 2 · p · (PA - 10 · LOG10(PL))/EC
PA = 10 · LOG10(A1(t)2/(2 · 50))

Netlist Form

LOGDET:Name n1 n2 SEN=val PL=val E=val EC=val [Rin=val] [Rout=val]

Netlist Example

LOGDET:1 1 2 SEN=1.2 PL=10W E=0.75dB EC=10dB



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