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High dynamic range closed loop automatic gain control circuit

  • US 5,283,536 A
  • Filed: 04/16/1993
  • Issued: 02/01/1994
  • Est. Priority Date: 11/30/1990
  • Status: Expired due to Term
First Claim
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1. A linear closed loop automatic gain control (AGC) circuit comprising:

  • amplifier means for receiving an input signal which is susceptible to variations in signal power, receiving a control signal, amplifying said input signal at a gain level in dB as a linear function of said control signal and providing a corresponding amplifier means output signal wherein said amplifier means comprises;

    input amplification means for, receiving said input signal and said control signal, amplifying said input signal at an input gain level in dB as a linear function of said control signal and providing a corresponding input amplification means output signal;

    filter means for receiving and filtering said input amplification means output signal; and

    output amplification means for, receiving said filtered input amplification means output signal and said control signal, amplifying said filtered input amplification means output signal at an output gain level in dB as a linear function of said control signal and providing a corresponding output amplifier means output signal;

    measurement means coupled to said amplifier means for measuring logarithmic signal power of said amplifier means output signal and providing a corresponding linear measurement signal; and

    integration means for receiving said measurement signal and a reference signal, integrating a difference between said measurement signal and said reference signal, and providing as a result of said integration said control signal.

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