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Ansoft Designer / Ansys Designer 在线帮助文档：

System Simulator >
System Component Models >
Modulators >
   Logarithmic Amplifier (LOGAMP)       

Logarithmic Amplifier (LOGAMP)

 

 


Property

Description

Units

Default

Range

SEN

Log sensitivity, in voltage units per dB

V/dB

0

[0, Inf)/Real

PL

Low input power

Watt

0

[1e-23, 1e17]/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]

ROUT

Output impedance

Ohm

0

[0, Inf)

Ports

Input

Input signal (complex)

Output

Output signal (complex)

 

Notes

1. This model performs logarithmic amplification. 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 bandpass signal and has same carrier frequency as the input. The output in-phase and quad-phase envelopes are logarithmically amplified as follows
vout,i(t) = M2(t) · vin,i(t)/A1(t)
vout,q(t) = M2(t) · vin,q(t)/A1(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

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

Netlist Example

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



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