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Method and apparatus for reducing charge and discharge time of capacitive elements

  • US 9,337,875 B2
  • Filed: 09/10/2013
  • Issued: 05/10/2016
  • Est. Priority Date: 06/05/2013
  • Status: Active Grant
First Claim
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1. A communication device, comprising:

  • an antenna;

    a transceiver coupled with the antenna;

    an RF capacitive device coupled with the antenna and the transceiver, wherein the RF capacitive device comprises;

    a device capacitor;

    a first resistive device coupled between a biasing node and one end of the device capacitor; and

    a second resistive device coupled between another end of the device capacitor and electrical ground; and

    an operational amplifier coupled with the RF capacitive device by way of the biasing node, wherein the RF capacitive device operates according to a first time constant; and

    a mirror circuit comprising a capacitive portion, wherein the capacitive portion comprises;

    a mirror capacitor;

    a first mirror resistive device coupled between the biasing node and one end of the mirror capacitor; and

    a second mirror resistive device coupled between another end of the mirror capacitor and electrical ground, wherein the capacitive portion operates according to a second time constant, wherein the mirror circuit emulates a time and frequency response of the RF capacitive device, wherein the second time constant is based on the first time constant, and wherein feedback signals from the mirror circuit are provided to an input of the operational amplifier via a feedback node coupled with the mirror circuit.

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