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Apparatus and methods for quadrature clock signal generation

  • US 8,760,209 B2
  • Filed: 09/27/2012
  • Issued: 06/24/2014
  • Est. Priority Date: 09/27/2012
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a sine-shaping filter configured to receive a clock input signal and to filter the clock input signal to generate a sinusoidal clock signal; and

    a polyphase filter configured to receive the sinusoidal clock signal and to generate an in-phase clock signal and a quadrature-phase clock signal based on the sinusoidal clock signal,wherein the in-phase clock signal and the quadrature-phase clock signal have a quadrature phase relationship,wherein the polyphase filter comprises a first stage including a first plurality of resistors and a first plurality of capacitors, wherein the first stage is associated with a first pole of a transfer function of the polyphase filter.

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