Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1985-11-14
1987-09-01
LaRoche, Eugene R.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 17, 331DIG2, H03L 0706
Patent
active
046911758
ABSTRACT:
An adaptive phase locked loop being particularly useful with low frequency input signals, the adaptive phase locked loop including a phase comparison unit (12) for comparing a component of the input signal with the reference signal having an average phase, a polarity detection unit (14) for providing a polarity indication signal dependent upon the polarity of the output signal, and a reference signal unit (13) for providing a reference signal having an average phase to the phase comparison unit (12). In response to the polarity indication signal, the reference signal unit (13) can vary the rate at which the average phase of the reference signal can be changed at either of two rates, with the first rate representing a relatively slow rate and the second rate representing a relatively fast rate. The device (10) also includes a reset unit (16) that also responds to the polarity indication signal to reset and reinitialize the reference signal unit (13) in response to a preselected phase comparison unit output polarity.
REFERENCES:
patent: 4503397 (1985-03-01), Schultz
patent: 4541109 (1985-09-01), Shimizu et al.
patent: 4570131 (1986-02-01), Lingstaedt
LaRoche Eugene R.
Mis David
Motorola Inc.
Southard Donald B.
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