Oscillators – Automatic frequency stabilization using a phase or frequency... – Tuning compensation
Patent
1992-05-27
1993-12-07
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Tuning compensation
331 17, 331 25, H03L 7093
Patent
active
052686558
ABSTRACT:
A self-adjusting phase-locked loop (PLL) parameter adjusting device (APAD) (100) and method that automatically adjusts a phase-locked loop to provide tracking ability when and where needed, as opposed to utilizing a PLL adjusting device with preset parameters, thus maintaining minimal possible noise bandwidth. The method utilizes (1) successively integrating the PLL error output signal over a number of samples to provide a plurality of sums, (2) checking a predetermined number of sums and recording and counting the sign of each sum, (3) comparing the counted record to a predetermined threshold value, and (4) automatically adjusting PLL parameter(s) and the sample number in accordance with a predetermined strategy, such that adjusted PLL parameters are provided to the PLL.
REFERENCES:
patent: 3983498 (1976-09-01), Malek
patent: 4107624 (1978-08-01), Turner
patent: 4117410 (1978-09-01), Bender
patent: 4117420 (1978-09-01), DeConinck et al.
patent: 4479091 (1984-10-01), Yoshisato
patent: 4668917 (1987-05-01), Levine
patent: 4672632 (1987-06-01), Andersen
Codex Corporation
Grimm Siegfried H.
Stockley Darleen J.
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