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Low-Cost Receiver Using Automatic Gain Control

  • US 20100130153A1
  • Filed: 11/25/2008
  • Published: 05/27/2010
  • Est. Priority Date: 11/25/2008
  • Status: Active Grant
First Claim
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1. A receiver, comprising:

  • a first programmable gain element having an input for receiving a radio frequency (RF) input signal, an output, and a control input, said first programmable gain element having gain steps of a first magnitude;

    a signal processing circuit having an input coupled to said output of said first programmable gain element, and an output;

    a second programmable gain element having an input coupled to said output of said signal processing circuit, an output, and a control input, said second programmable gain element having gain steps of a second magnitude that is smaller than said first magnitude; and

    a controller having a first output coupled to said control input of said first programmable gain element, and a second output coupled to said control input of said second programmable gain element, wherein said controller adjusts a gain of the receiver by a first desired gain by changing a gain of said first programmable gain element by a first amount and also changing a gain of said second programmable gain element by substantially a corresponding inverse first amount, and subsequently changing said gain of said second programmable gain element incrementally by steps of said second magnitude to achieve said first desired gain.

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