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Peak hold circuit with improved linearity

  • US 5,315,168 A
  • Filed: 04/28/1993
  • Issued: 05/24/1994
  • Est. Priority Date: 04/28/1993
  • Status: Expired due to Term
First Claim
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1. Apparatus for detecting peak values in an input signal, said apparatus comprising:

  • operational amplifier means having a first amplifier input for receiving said input signal, a second amplifier input for receiving a feedback signal, and an amplifier output for providing an amplified signal;

    first transistor means for receiving said amplified signal and having a first transistor output for providing said feedback signal;

    current sink means coupled to said first transistor output for drawing a current from said first transistor means so that said feedback signal is continually provided from said first transistor means to said second amplifier input;

    peak hold capacitor means for storing a charge representing a peak amplitude of said input signal;

    second transistor means for receiving said amplified signal and for coupling said amplified signal to said peak hold capacitor means; and

    discharge means for discharging said peak hold capacitor means.

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