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Noise simulation in Cadence

EthanRFIC

 Hi,

 I'm learning Noise Simulation in Cadence.  The circuit is just a simple common source amplifier with a noise-less resistor as the load. What I want to do is to observe the noise situation for the nmos transistor.

 

However, when I do the simulation, spectre is always terminated due to a fatal error showing: 

"ERROR(SFE-51): name conflict: value 'M0' of type 'scalar subcircuit instance' encountered. Expected value is of type 'scalar instance'.

 ---I've checked out the manual reference, but I still have no idea what the error is there.

 

So if anyone can help me out? Thank you so much!

 

The simulation setup is :

 Analysis: noise

Sweep Range: start=1, stop=100G.

Output noise: probe, output probe instance: /M0

Input Noise: None

 I'm using Cadence version of IC6.1.5-64bit

Parents
  • EthanRFIC

     Thank you so much Andrew! It helps a lot! However, I'm still not very sure what to probe if I want to measure the output noise current. You mentioned "a voltage source/iprobe", then what is 'iprobe'?

    My test circuit is shown below. I want to test the thermal current noise "ID^2" of the NMOS transistor. Do you mean that I can just set up "probe the \VD" in the noise simulation setup (probe the voltage souece VD)? 

    I did probe the "VD" and it gave me a current plot, in the "result browser", there are some parameters which I want to confirm:

    fn: flicker current noise?

    id: thermal current noise?

    igb/igd/igs: current noise from gate to bulk/drain/souece?

    Am I right with those? Thank you very much! I'm very appreciate for your correcting.

    Best Regards,

    Ethan

Reply
  • EthanRFIC

     Thank you so much Andrew! It helps a lot! However, I'm still not very sure what to probe if I want to measure the output noise current. You mentioned "a voltage source/iprobe", then what is 'iprobe'?

    My test circuit is shown below. I want to test the thermal current noise "ID^2" of the NMOS transistor. Do you mean that I can just set up "probe the \VD" in the noise simulation setup (probe the voltage souece VD)? 

    I did probe the "VD" and it gave me a current plot, in the "result browser", there are some parameters which I want to confirm:

    fn: flicker current noise?

    id: thermal current noise?

    igb/igd/igs: current noise from gate to bulk/drain/souece?

    Am I right with those? Thank you very much! I'm very appreciate for your correcting.

    Best Regards,

    Ethan

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