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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 have attached the snapshots of the "Solutions" library which is the default library from Cadence.
    I am using Cadence version 6.1.5.

    I found op_amp schematic in Solutions library with differential amplifier and CS amplifier as blocks.
    Then I got to see the schematic of the differential amplifier and CS amplifier in the "Solutions" folder.

    I have attached the circuit I have used. My intention is to use OpAmp as linear multiplier for ASK modulation. But I had never used Opamp in my design. Moreover, I had never used any symbols from "Solutions" library. In order to test whether the symbol suits to my application, I had simulated a simple voltage amplifier circuit which amplifies the input signal by 10 times.

    The last two are the sample circuit I simulated and the plot I got. But the expected plot is 10 times the input signal.

    Hope you understand my point now.

    Please let me know where I was wrong and how to correct the same.

    Thanks,
    Shahnaz.

Reply

  •  Hi Andrew,

    I have attached the snapshots of the "Solutions" library which is the default library from Cadence.
    I am using Cadence version 6.1.5.

    I found op_amp schematic in Solutions library with differential amplifier and CS amplifier as blocks.
    Then I got to see the schematic of the differential amplifier and CS amplifier in the "Solutions" folder.

    I have attached the circuit I have used. My intention is to use OpAmp as linear multiplier for ASK modulation. But I had never used Opamp in my design. Moreover, I had never used any symbols from "Solutions" library. In order to test whether the symbol suits to my application, I had simulated a simple voltage amplifier circuit which amplifies the input signal by 10 times.

    The last two are the sample circuit I simulated and the plot I got. But the expected plot is 10 times the input signal.

    Hope you understand my point now.

    Please let me know where I was wrong and how to correct the same.

    Thanks,
    Shahnaz.

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