Frequency and/or phase lock loops with beat frequency estimation
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United States of America Patent
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-
Aug 12, 2008
Grant Date -
Feb 15, 2007
app pub date -
Mar 4, 2004
filing date -
Mar 4, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control loop (10) for producing an output signal with a stable nominal frequency is provided. The control loop includes inputs for reference (11) and oscillator (25) output signals, a beat frequency generator (12) for producing a signal with a frequency that is the difference between the oscillator and reference signal frequencies, an ADC (14) to convert the beat frequency to a digital beat frequency signal, an estimator (17) for estimating the frequency or phase of the beat signal, an adder (18) for combining an offset and modulation signal and the estimated frequency or phase of the beat signal into an added signal, and a DAC (23) for generating an analogue control signal for controlling the oscillator output frequency.
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