Oscillating circuit with limitation function of oscillation freq

Details Oscillating circuit with limitation function of oscillation freq Oscillating circuit with limitation function of oscillation freq

1998-03-04

1999-08-10

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 27, H03L 7087

Patent

active

059364726

ABSTRACT:
In an oscillating circuit, an oscillator generates an oscillation signal with a frequency, increases the frequency of the oscillation signal in response to a frequency increase signal and decreases the frequency of the oscillation signal in response to a frequency decrease signal. A detecting unit receives the oscillation signal and a reference signal. The detecting unit outputs the frequency increase signal to the oscillator when a ratio of the frequency of the oscillation signal to a frequency of the reference signal is smaller than a first predetermined value, and outputs the frequency decrease signal to the oscillator when a ratio of the frequency of the oscillation signal to the frequency of the reference signal is larger than a second predetermined value.

REFERENCES:
patent: 4404530 (1983-09-01), Stryer
patent: 4914404 (1990-04-01), Ernst
Messerschmitt (Sep. 1979) "Frequency Detectors for PLL Acquisition in Timing and Carrier Recovery", IEEE Transactions on Communications COM-27 (9) :1288-1295.

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