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Variable-gain circuit

  • US 20010033199A1
  • Filed: 02/06/2001
  • Published: 10/25/2001
  • Est. Priority Date: 02/07/2000
  • Status: Active Grant
First Claim
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1. A variable-gain circuit comprising a functional circuit for receiving an input signal to output an output signal having a gain with respect said input signal, a first gain control section for receiving a first control signal to control said functional circuit to operate based on a first gain curve of decibel gain plotted in a graph against said first control signal, said first gain curve being convex toward a bottom of the graph, a second gain control section for receiving a second control signal to control said functional circuit to operate based on a second gain curve of decibel gain plotted in a graph against said second control voltage, said second gain curve being convex toward a top of the graph, said first and second control signals being applied so that said first gain curve and said second gain curve cancel each other in non-linearity.

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