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Phase interpolators and push-pull buffers

  • US 9,899,994 B2
  • Filed: 02/13/2017
  • Issued: 02/20/2018
  • Est. Priority Date: 12/16/2010
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a first buffer configured to receive a first clock signal having a first phase from a first push-pull buffer;

    a second buffer configured to receive a second clock signal having a second phase from the first push-pull buffer;

    a third buffer configured to receive a third clock signal having a third phase from a second push-pull buffer;

    a fourth buffer configured to receive a fourth clock signal having a fourth phase from the second push-pull buffer; and

    a controller configured to selectively activate the first buffer or second buffer based on a select signal and to selectively activate the third buffer or fourth buffer based on the select signal, wherein outputs of the first, second, third, and fourth buffers are coupled together to provide an output signal.

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