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Multiple bandwidth phase lock filters for multimode radios

  • US 6,819,197 B2
  • Filed: 01/29/2002
  • Issued: 11/16/2004
  • Est. Priority Date: 01/29/2002
  • Status: Active Grant
First Claim
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1. An apparatus for filtering a phase error signal, comprising:

  • a first filter subcircuit receiving a phase error signal from a phase comparator and filtering the error signal with the first filter subcircuit when enabled;

    a second filter subcircuit receiving the phase error signal from the phase comparator and filtering the error signal with the second filter subcircuit when enabled;

    a first enable switch and a second enable switch which are activated in combination to control filtering of the error signal;

    a fast acquisition subcircuit including a fast acquisition enable switch for changing a charge pump current through at least one of the first and second filter subcircuits; and

    wherein the first filter subcircuit is enabled by activating a first combination of the first and second enable switches and the second filter subcircuit is enabled by activating a second combination of the first and second enable switches.

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