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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

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  • Andrew Beckett

    You cannot measure noise with a transistor as the output. You can measure the output noise at a node, or probing a port (in which case it gives the noise voltage across the port, but can then exclude the noise in the load when computing noise figure), or probing a resistor or a voltage source/iprobe, in which case it will measure the output noise current.

    So, you can measure the noise voltage at a suitable point, and then look at the noise contributions from the transistor (either with the results->print->noise summary, or with the results browser).

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    You cannot measure noise with a transistor as the output. You can measure the output noise at a node, or probing a port (in which case it gives the noise voltage across the port, but can then exclude the noise in the load when computing noise figure), or probing a resistor or a voltage source/iprobe, in which case it will measure the output noise current.

    So, you can measure the noise voltage at a suitable point, and then look at the noise contributions from the transistor (either with the results->print->noise summary, or with the results browser).

    Regards,

    Andrew.

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