Electronics > Beginners

Measuring transconductance of any circuit

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promach:

--- Quote ---No.  I am calculating Gm.  Certainly Gm has some frequency dependence...you can factor that in when you pick the sine frequency.
--- End quote ---

Sorry, I still do not get why the capacitor is not included in the test circuit ?

Ideal Leq using gyrator implementation = CL*s/(Gm1*Gm2)

Are you saying that the sine frequency of the current source I1 helps to emulate a capacitor ?

Wimberleytech:

--- Quote from: promach on December 16, 2018, 01:52:00 am ---
--- Quote ---No.  I am calculating Gm.  Certainly Gm has some frequency dependence...you can factor that in when you pick the sine frequency.
--- End quote ---

Sorry, I still do not get why the capacitor is not included in the test circuit ?

Ideal Leq using gyrator implementation = CL*s/(Gm1*Gm2)

Are you saying that the sine frequency of the current source I1 helps to emulate a capacitor ?

--- End quote ---

In your equation...is Gm1 a function of the capacitor??

No, the sine is not emulating a capacitor.

promach:

--- Quote ---In your equation...is Gm1 a function of the capacitor??
--- End quote ---

The answer is no. Gm1 is the overall transconductance of cmos inverter. Gm1 is independent of capacitor. Same applies to Gm2

Wimberleytech:

--- Quote from: promach on December 16, 2018, 02:31:07 am ---
--- Quote ---In your equation...is Gm1 a function of the capacitor??
--- End quote ---

The answer is no. Gm1 is the overall transconductance of cmos inverter. Gm1 is independent of capacitor. Same applies to Gm2

--- End quote ---

Great!  We are making progress.  That is why my method to calculate Gm has no reactive components.

promach:

--- Quote --- That is why my method to calculate Gm has on reactive components.
--- End quote ---

Investigate the Gm blocks separately as suggested by the forum title itself
This is my personal opinion as of now but please bear in mind that I could be wrong as well

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