Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1998-01-26
2000-11-14
Kinkead, Arnold
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 12, 331 4, 329304, 329307, 329308, 342194, 342199, 342200, H03B 2300, H03L 700
Patent
active
061475602
ABSTRACT:
The present invention relates to methods and devices for such control and supervision of an oscillator signal from a controllable oscillator that is done mainly to control the frequency variation of the oscillator signal. According to the invention, the controllable oscillator is controlled by a controlling voltage, which in turn is modified by a correction signal, generated in a control loop. A time discrete representation of a secondary phase is generated in the control loop, the secondary phase corresponding to a frequency being the difference between the frequency of the oscillator signal and a constant frequency. A time discrete approximation signal is generated in dependence of the time discrete representation of the secondary phase. A time discrete error signal is generated in dependence of the time discrete approximation signal, the time discrete error signal indicating the difference between the actual frequency slope of the oscillator signal and a desired frequency slope. The correction signal is generated in dependence of the time discrete error signal. The control loop can also be adaptive, meaning that data from one control sequence is being used in a later control sequence.
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International Search Report issued on Sep. 2, 1998 in connection with counterpart PCT Application No. SE97/02118.
Erhage Lars I.
Erikmats Osten E.
Karlsson H.ang.kan L.
Rizell Svenolov
Kinkead Arnold
Telefonaktiebolget LM Ericsson
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