Tags: architectures, cascode, cascoded, class A, current mirror, folded cascode, opamp, operational amplifier, subtractor

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List of operational amplifier (opamp) architectures:

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Circuits with opamps:

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List of operational amplifier parameters:

  • input voltage range

  • output voltage range

  • offset

  • maximum output sourced/sinked current

  • AC parameters:

    • DC gain

    • 3 dB frequency

    • bandwidth (unity frequency)

    • phase margin

    • gain margin

  • current consumption (power consumption)

  • rectangular waveform test on the input – how the output behaves

  • CMR (common-mode range on the input)

    • [Camenzind]: “Describes the minimum to maximum DC level at which the two inputs are functional. Desirable is rail-to-rail, i.e. from the negative supply to the positive one, but many op-amps only work with the inputs a volt or two above -V(or ground for a single supply) to some voltage below +V.”

  • CMRR (common-mode rejection ratio)

    • [Camenzind]: “If you connect both inputs together, bias them at a functional DC level and superimpose on the bias a small AC voltage, no signal should ideally appear at the output. In reality a small signal leaks through and the measure describes how much smaller this signal is (in dB) compared to the input.”

  • PSRR (power supply rejection ratio)