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OpAmp Simulation in Cadence Spectre

Shahnaf
Hi, I have used OpAmp symbol from Solutions library (default library of cadence). As an initial step, I have simulated a basic circuit in Op Amp. But I am not getting the desired output. Moreover, I have checked the cadence simulation manual for Op Amp. I found something difference in the symbol (from Solutions library) to that of the Cadence manual. Can you please let me know where I am wrong and what needs to be corrected? Thanks, Shahnaz
Parents

  • Hi Andrew,

    I would like to model an ideal integrator in Cadence. Currently, I am using "VCVS" as an amplifier shown in the attachment.

    When I simulate the circuit, apparently, capacitive-feedback does not work properly, however, I have added a large resitor in series with the capacitor. The opamp model acts like a comparator, i.e. As long as negative input has a larger voltage than the positive input, output shows the minimum voltage and Vice versa. I am wondering if you might how to resolve the issue!

    Do you have any suggestion how to model an ideal integrator in Cadence? Preferably, I do not want to use Verilog-A opamp. 

    Thanks.

Reply

  • Hi Andrew,

    I would like to model an ideal integrator in Cadence. Currently, I am using "VCVS" as an amplifier shown in the attachment.

    When I simulate the circuit, apparently, capacitive-feedback does not work properly, however, I have added a large resitor in series with the capacitor. The opamp model acts like a comparator, i.e. As long as negative input has a larger voltage than the positive input, output shows the minimum voltage and Vice versa. I am wondering if you might how to resolve the issue!

    Do you have any suggestion how to model an ideal integrator in Cadence? Preferably, I do not want to use Verilog-A opamp. 

    Thanks.

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