G - Physics – 01 – R
Patent
G - Physics
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G01R 23/14 (2006.01) H03D 13/00 (2006.01) H03L 7/089 (2006.01) H03L 7/091 (2006.01) H03L 7/099 (2006.01) H03L 7/14 (2006.01) H03L 7/18 (2006.01) H04B 1/26 (2006.01) H04L 27/02 (2006.01) H04L 27/00 (2006.01)
Patent
CA 2290862
Disclosed is a frequency-locked loop (FLL), which attempts to bring about frequency and phase synchronization between two signals over the control bandwidth of the loop: a reference signal and a voltage-controlled oscillator (VCO) signal. For example, the FLL employs a reference signal generated by a crystal oscillator of frequency .function. REF and a VCO signal generated by the oscillations of an unquenched SRG resonator with tunable resonant frequency .function. RES. These signals are connected to the inputs of a phase/frequency detector (PFD) which produces output pulses in response to the relationship between .function.REF and .function.RES. These pulses are applied to a loop filter (LF) which creates a voltage using some kind of charge-storage element. This loop filter voltage is a so-called error voltage whose value is used to control the frequency of the resonator to bring the reference signal and VCO signal into phase synchrony.
Cherry James Andrew
Cloutier Mark Miles
Swaminathan Ashok
Gowling Lafleur Henderson Llp
Philsar Electronics Inc.
Skyworks Solutions Inc.
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