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Single chip CMOS transmitter/receiver and method of using same

  • US 6,781,424 B2
  • Filed: 09/25/2002
  • Issued: 08/24/2004
  • Est. Priority Date: 07/24/1998
  • Status: Expired due to Term
First Claim
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1. A system for demodulating communications signals, comprising:

  • a mixer which mixes a received signal with an oscillator signal, said oscillator signal being at least substantially equal to a carrier frequency of the received signal;

    a amplifier which amplifies first and second signals output from the mixer, said first signal lying within a desired channel and said second signal lying within an adjacent channel, the amplifier increasing an amplitude of said second signal to a value substantially corresponding to a desired linearity limit and increasing an amplitude of said first signal to a value less than the desired linearity limit; and

    a gain controller which reduces the amplitude of said second signal and increases the amplitude of said first signal, said gain controller being positioned after the amplifier along a signal path.

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