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Voltage sampler driver with enhanced high-frequency gain

  • US 10,498,305 B2
  • Filed: 06/19/2018
  • Issued: 12/03/2019
  • Est. Priority Date: 01/25/2016
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a voltage sampler driver connected to a pair of output nodes, the voltage sampler driver configured to generate an output differential current through the pair of output nodes from at least a first and a second differential current, the voltage sampler driver comprising;

    an input differential branch pair configured to receive a set of input signals corresponding to symbols of a codeword and to responsively generate the first differential current, the input differential branch pair comprising a first branch having a plurality of transistors connected in parallel to a first output node of the pair of output nodes, the plurality of transistors of the first branch configured to receive corresponding input signals of the set of input signals and to responsively generate a plurality of partial currents that are summed via the first output node to form a portion of the first differential current; and

    an offset voltage branch pair, each branch of the offset voltage branch pair configured to receive (i) an offset voltage control signal and (ii) one or more input signals of the set of input signals via respective high-pass filtered inputs, each branch of the offset differential branch pair comprising one or more transistors configured to generate the second differential current having an offset correction component and a supplemented high-frequency component of the set of input signals; and

    an amplifier stage connected to the voltage sampler driver, the amplifier stage configured to generate a differential output voltage on the pair of output nodes based on the output differential current.

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