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Amplifier input stage with charge pump supplying a differential transistor pair

  • US 5,422,600 A
  • Filed: 06/23/1994
  • Issued: 06/06/1995
  • Est. Priority Date: 06/23/1994
  • Status: Expired due to Term
First Claim
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1. An input stage of amplifier circuit, comprising:

  • a differential transistor pair operating in response to a differential input signal for developing first and second voltages;

    circuit means responsive to said first and second voltages for providing an output signal of the input stage of the amplifier circuit;

    a charge pump coupled for receiving an operating potential from a first power supply conductor and having an output for providing a pump voltage;

    a first current source for providing a predetermined current at an output; and

    a current mirror circuit having first and second conduction paths, said first conduction path being coupled between said output of said first current source and said output of said charge pump, said second conduction path being coupled between said output of said charge pump and a conduction path of said differential transistor pair.

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