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Power dissipation reduction in wireless transceivers

DC
  • US 9,838,962 B2
  • Filed: 03/24/2016
  • Issued: 12/05/2017
  • Est. Priority Date: 03/01/2003
  • Status: Expired due to Term
First Claim
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1. A method for power dissipation reduction in a receiver of a wireless transceiver of a battery powered portable wireless device, and a corresponding improvement in a drain on battery life of the battery powered portable wireless device, the method comprising:

  • receiving a wireless signal having a desired signal and an interferer signal, by the wireless transceiver of the battery powered portable wireless device, the wireless transceiver having a receiver signal path comprising a plurality of circuits, wherein the plurality of circuits includes an amplifier, a filter, and a mixer, and wherein the wireless transceiver comprises a circuit for determining a signal strength of the interferer signal and a signal strength of the desired signal at a first node in the receiver signal path; and

    varying an impedance and a bias current of one or more of the plurality of circuits in the receiver signal path of the wireless transceiver as the signal strength of the interferer signal and the signal strength of the desired signal vary;

    wherein the bias current and the impedance of the circuit in the receiver signal path of the wireless transceiver are varied according to the following;

    (i) when the signal strength of the interferer signal is high and the signal strength of the desired signal is low, the bias current of the circuit in the receiver signal path of the wireless transceiver is increased and the impedance of the circuit in the receiver signal path of the wireless transceiver is reduced, resulting in a first current drain;

    (ii) when the signal strength of the interferer signal is high and the signal strength of the desired signal is high, the bias current of the circuit in the receiver signal path of the wireless transceiver is increased while the impedance of the circuit in the receiver signal path of the wireless transceiver is increased, resulting in a reduction in current drain when compared to the first current drain;

    (iii) when the signal strength of the interferer signal is low and the signal strength of the desired signal is low, the bias current of the circuit in the receiver signal path of the wireless transceiver is reduced and the impedance of the circuit in the receiver signal path of the wireless transceiver is reduced resulting in reduced current drain when compared to the first current drain; and

    (iv) when the signal strength of the interferer signal is low and the signal strength of the desired signal is high, the bias current of the circuit in the receiver signal path of the wireless transceiver is increased and the impedance of the circuit in the receiver signal path of the wireless transceiver is increased, resulting in a reduction in current drain compared to the first current drain.

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