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Amplifying circuit

  • US 7,106,131 B2
  • Filed: 01/13/2004
  • Issued: 09/12/2006
  • Est. Priority Date: 04/14/2003
  • Status: Active Grant
First Claim
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1. A circuit comprising:

  • an operational amplifier comprising a positive input end, a negative input end, and an output end;

    a first input impedance coupled between the negative input end and a first input signal;

    a second input impedance coupled between the negative input end and a second input signal; and

    a first output impedance coupled between the negative input end and the output end;

    wherein resistances of the first and second input impedances are controlled by a first and a second control signals respectively, so that the resistances of the first and second input impedances are substantially different from each other and are close to each other.

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