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Amplifier

  • US 6,586,995 B1
  • Filed: 09/19/2002
  • Issued: 07/01/2003
  • Est. Priority Date: 04/03/2002
  • Status: Expired due to Fees
First Claim
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1. An amplifier comprising:

  • a first voltage follower circuit that includes a plurality of P-type MOS transistors and outputs a current having a magnitude equivalent to a value obtained by dividing a difference voltage between an input bias voltage, applied to a positive-phase input terminal of the first voltage follower circuit, and an input signal voltage, applied to a negative-phase input terminal of the first voltage follower circuit, supplied directly with feedback from an output terminal via a first resistor, by resistance of the first resistor;

    a first current mirror circuit that receives the current output by the first voltage follower circuit;

    a second voltage follower circuit that includes a plurality of N-type MOS transistors and outputs a current having a magnitude equivalent to a value obtained by dividing a difference voltage between an input bias voltage applied to a positive-phase input terminal of the second voltage follower circuit, and the input signal voltage, applied to a negative-phase input terminal of the second voltage follower circuit, supplied directly with feedback from an output terminal, via a second resistor, by resistance of the second resistor; and

    a second current mirror circuit that receives the current output by the second voltage follower circuit.

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