Circuit for detecting phase errors and generating control...

Details Circuit for detecting phase errors and generating control... Circuit for detecting phase errors and generating control...

2007-10-09

2007-10-09

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

C331S00100A

Reexamination Certificate

active

11188626

ABSTRACT:
A circuit for detecting phase errors and generating control signals includes a digital phase detector and a digital filter. The digital phase detector receives an input signal and a reference signal and generates a set of phase error control signals, and the digital filter receives the phase error control signals to generate control data. The digital filter can include a lookup table, an adder, and a register. The lookup table receives the phase error control signals and outputs a lookup value. The adder receives the lookup value and a register value and generates the control data. The register receives and stores the control data and outputs the stored control data as the register value.

REFERENCES:
patent: 5266907 (1993-11-01), Dacus
patent: 5552727 (1996-09-01), Nakao
patent: 6259278 (2001-07-01), Huang

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