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Tunable filters, cancellers, and duplexers based on passive mixers

  • US 9,800,278 B2
  • Filed: 09/06/2016
  • Issued: 10/24/2017
  • Est. Priority Date: 09/04/2015
  • Status: Active Grant
First Claim
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1. A tunable duplexer comprising:

  • one or more antennas;

    an isolator electrically coupled to the one or more antennas for isolating a received signal and a transmitted signal on the one or more antennas;

    a combiner comprising a first input electrically coupled to the one or more antennas; and

    a feedforward path, between a coupler of the transmitted signal and a second input of the combiner, configured to cancel leakage across the isolator, wherein the feedforward path comprises a tunable delay cell comprising a plurality of passive mixers electrically coupled together for receiving an input signal and outputting a delayed signal, each passive mixer comprising a plurality of mixer switches.

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