Simulating Offset of Chopper Amplifier

[hsharghi]

Hi,

I'm trying to simulate a Chopper Amplifier Input Offset Voltage in Cadence?

Does anyone know how to perform this operation? Is there a way to do this using PSS? If so, how?

Your responses would be greatly appreciated.

Thanks.

 

[chuckey]

Feed in a couple of microvolts one one input?
Frank

 

[hsharghi]

Hi Chucky,

Usually, in continuous time mode, I measure the op amp's offset by taking the difference between the two inputs and running a monte carlo to introduce mismatch into the circuit. That difference would be my offset. However, in a sample-hold environment, the dc operating point at the inputs are not well defined due to the switching operation.

I read somewhere that you can perform this measurement using PSS analysis. But I'm not sure how. My sampling frequency is 200 KHz and I'm chopping at 100 KHz. Does PSS replace the DC analysis in the switching mode?

 

[frankiejiang]

Hi,

I usually add an DC offset voltage in the input pin,then run a transient response,and average the output voltage,so the different is the residual offset.

Hi,

I'm trying to simulate a Chopper Amplifier Input Offset Voltage in Cadence?

Does anyone know how to perform this operation? Is there a way to do this using PSS? If so, how?

Your responses would be greatly appreciated.

Thanks.