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Switching amplifiers into and out of circuits with reduced output noise

  • US 5,764,103 A
  • Filed: 07/17/1996
  • Issued: 06/09/1998
  • Est. Priority Date: 07/17/1996
  • Status: Expired due to Term
First Claim
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1. An amplifier circuit, comprising:

  • an input lead to receive an input signal;

    a main amplifier including;

    a first stage having a first input coupled to the input lead to receive the input signal, and a first output to provide a first stage output signal; and

    a second stage having a second input switchably coupled to the first output to receive the first stage output signal, and a second output to provide an output signal to an output lead of the amplifier circuit; and

    a catching amplifier coupled to the second stage during at least one time interval so as to cause a gain of approximately zero to result between the input lead and the output lead during the at least one time interval, the main amplifier being arranged such that the first output is uncoupled from the second input during at least a portion of the at least one time interval.

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