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Synchronous logarithmic amplifier

  • US 5,298,811 A
  • Filed: 08/03/1992
  • Issued: 03/29/1994
  • Est. Priority Date: 08/03/1992
  • Status: Expired due to Term
First Claim
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1. A logarithmic amplifier (40) comprising:

  • a plurality of N serially coupled amplifier stages (14) each having an input and an output, wherein N is an integer greater than one, and wherein the input of a first amplifier stage forms a logarithmic amplifier input;

    a plurality of N multiplier stages (26) each having a first input coupled to the output of a corresponding amplifier stage, a second input for receiving a control signal, and an output; and

    summing means (24) having a plurality of inputs coupled to the outputs of each of the multiplier stages and an output forming a logarithmic amplifier output.

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