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Two-stage rail-to-rail operational amplifier

  • US 5,293,136 A
  • Filed: 09/17/1992
  • Issued: 03/08/1994
  • Est. Priority Date: 09/17/1992
  • Status: Expired due to Term
First Claim
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1. An operational amplifier, comprising:

  • a differential input circuit adapted to receive a differential input signal to produce an amplified differential output signal for application to first and second nodes;

    said differential input circuit having a common-mode control circuit that produces first and second common-mode control voltages on said first and second nodes, whereby said common-mode control voltages are combined with said amplified differential output signal on said first and second nodes to produce a first stage differential output signal;

    and a high-swing output stage connected to receive the first stage differential output signal.

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