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Direct conversion receivers and filters adapted for use therein

  • US 6,335,656 B1
  • Filed: 09/30/1999
  • Issued: 01/01/2002
  • Est. Priority Date: 09/30/1999
  • Status: Expired due to Term
First Claim
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1. A filter, comprising:

  • a first high pass filter stage; and

    a second high pass filter stage, said second high pass filter stage being serially coupled to said first high pass filter stage to maintain a low cut-off frequency;

    said first high pass filter including, an amplifier, and a low pass filter coupled in a negative feedback arrangement with said amplifier, said low pass filter switching a cutoff frequency thereof from an initial high cutoff frequency to a subsequent lower cutoff frequency;

    said second high pass filter including, an amplifier, and a low pass filter coupled in a negative feedback arrangement with said amplifier, said low pass filter switching a cutoff frequency thereof from an initial high cutoff frequency to a subsequent lower cutoff frequency.

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