Frequency diverse discrete-time phase-lock device and apparatus

Details Frequency diverse discrete-time phase-lock device and apparatus Frequency diverse discrete-time phase-lock device and apparatus

2011-02-22

2011-02-22

Pascal, Robert (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

C331S00100A, C327S156000, C327S159000

Reexamination Certificate

active

07893775

ABSTRACT:
A discrete-time phase lock loop (DTPLL) includes an analog section comprising a digital-to-analog converter (DAC) and an oscillator, operative to provide a clock signal based on an input from the DAC. The DTPLL also includes a digital signal processor (DSP). The DSP includes a loop controller state machine; a phase detector; a counter, operative to receive clock signals from the oscillator and to provide a count value to the phase detector; a divider, operative to receive a reference signal and to provide a reference pulse output to the phase detector; and a loop filter operative to provide a control effort value based on an output from the phase detector. Based on the phase error value, an output of the oscillator is changed to reduce the phase error to a steady state value.

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Tim Wescott, “Applied Control Theory for Embedded Systems,” ISBN-13:978-0-7506-7839-1, Chapter 9, Section 3 entitled “In Loop Measurement,” pp. 229-234, Apr. 2006.

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