Adaptive method and apparatus to control loop bandwidth of a phase lock loop
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United States of America Patent
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Dec 27, 2005
Grant Date -
Apr 28, 2005
app pub date -
Oct 23, 2003
filing date -
Oct 23, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a PLL (Phase Lock Loop) reducing the lock-in-time of the phase lock loop by altering the impedance of the damping resistor portion of the included LPF (Low Pass Filter) as a function of the difference in frequency or phase between a PLL applied reference frequency and the output frequency provided by the VCO (Voltage Controlled Oscillator) portion of the PLL. This variable impedance is accomplished by introducing a feed forward path that switches a capacitor in and out of the circuit in accordance with the difference frequency. One embodiment uses a mixer to provide the difference frequency signal.
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