Questions on two-port network

promach · Sep 26, 2017

For z-parameter model:

a) How to derive the two equations in the screenshot below which are retrieved from https://en.wikipedia.org/wiki/Impedance_parameters#Impedance_relations ?

b) Why is output impedance, Zout computed with input node shorted to ground ?

promach · Sep 26, 2017

For Y-parameter model:

a) As shown below , why "Though allowing simpler algebra, the Y model does not provide intuitive results." ?

BigBoss · Sep 26, 2017

promach said:
For z-parameter model:
a) How to derive the two equations in the screenshot below which are retrieved from https://en.wikipedia.org/wiki/Impedance_parameters#Impedance_relations ?
View attachment 141462
b) Why is output impedance, Zout computed with input node shorted to ground ?

They are coming from this representation.

If you do the math, you'll get the same result.

promach · Sep 26, 2017

For Y-parameter model:

b) As in **broken link removed**

, why " y21 =gm - yμ " ?

BigBoss · Sep 27, 2017

promach said:
For Y-parameter model:

b) As in **broken link removed**

, why " y21 =gm - yμ " ?

View attachment 141490

Can't you calculate so simple circuit equation ?? You should work hard..

promach · Sep 27, 2017

why is y21 not depending on yπ (parallel with yμ) ?

promach · Sep 28, 2017

@BigBoss , I got it now.

How can the second slide on https://ocw.nthu.edu.tw/ocw/upload/12/237/05handout.pdf#page=16 be reciprocal ?

I am not sure how to proceed from these equations to prove that it is reciprocal.

Anyone ?

Questions on two-port network

promach

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