what is the difference between input noise and equvalient noise in cadence

[afujian]

Hi all,
The noise terms are confusing me in cadence,such as input noise and equvalient input noise,,output noise and equvalient output noise,who can tell the difference between them?

What is the meaning of squared output(input )noise?

I also have a question about how to simulate the linearity(gm vs Vpeak to peak) of Gm cell for OTA-C filter?

I'm sorry for so many questions and thanks for your help.

 

[erikl]

Re: what is the difference between input noise and equivalent noise

... input noise and equvalient input noise,,output noise and equvalient output noise,who can tell the difference between them? ...

Equivalent noise simply represents a noise source (current, voltage, or resistor) at the input, output, or any other terminal of a noiseless circuit, which replaces the existing (real) noise at the respective otherwise open terminal of the real circuit.

Hence the equivalent input noise is identical (or equivalent) to the input noise of the open input circuit (meaning: no other noise sources present than that/those from the circuit itself); accordingly the same is valid for the open (no load) output, or any other open terminal of the circuit.

 

[afujian]

thank you erikl,they are indeed identical according to the simulation.