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Even harmonic direct-conversion receiver, and a transmitting and receiving apparatus using the same

  • US 6,600,911 B1
  • Filed: 05/30/2000
  • Issued: 07/29/2003
  • Est. Priority Date: 09/30/1998
  • Status: Expired due to Fees
First Claim
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1. An even harmonic direct-conversion receiver, comprising:

  • an antenna configured to receive and output a received wave having a received wave frequency;

    an amplifier configured to amplify said received wave and to output an amplified signal;

    a bandpass filter disposed after said amplifier and configured to output a bandpass limited amplified signal;

    a local oscillator configured to output a local oscillation wave having an oscillation wave frequency at approximately half said received wave frequency;

    an even harmonic quadrature mixer configured to mix said bandpass limited amplified signal with said local oscillation wave and to output a baseband signal;

    a signal processing circuit configured to demodulate said baseband signal; and

    a filter device disposed before said amplifier, said filter device configured to pass said received wave and to substantially suppress a frequency band corresponding to said oscillation wave frequency.

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