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Tunable radio frequency (RF) equalizer

  • US 10,097,381 B2
  • Filed: 06/12/2017
  • Issued: 10/09/2018
  • Est. Priority Date: 05/29/2015
  • Status: Active Grant
First Claim
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1. An equalizing system, comprising:

  • a wireless communication system for receiving at least one service, the wireless communication system comprising a plurality of optical fiber cables and a plurality of remote units connected by the optical fiber cables, the plurality of remote units being distributed over a deployment site, at least one service being routed to the plurality of remote units; and

    a RF equalizer comprising;

    a coupler comprising an input port, an output port, a coupling port, and an isolation port; and

    a combination circuit, comprising;

    a coupling node electrically coupled to the coupling port;

    a first digitally tunable capacitor (DTC) connected between the coupling node and ground;

    a resistor connected between the coupling node and ground that controls a quality factor of resonance;

    an isolation node coupled to the isolation port; and

    a second DTC, whereinone of the first DTC and the second DTC is configured as a coarse DTC and the other one of the first DTC and the second DTC is configured as a fine DTC.

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