Voltage controlled oscillator and PLL circuit

Details Voltage controlled oscillator and PLL circuit Voltage controlled oscillator and PLL circuit

2007-11-27

2007-11-27

Kinkead, Arnold (Department: 2817)

Oscillators

With frequency adjusting means

Step-frequency change

C331S016000, C331S057000, C331S074000

Reexamination Certificate

active

10939513

ABSTRACT:
A voltage comparing circuit activates a first voltage comparison signal when a control voltage is lower than a first reference voltage and a second voltage comparison signal when the control voltage is higher than a second reference voltage. In synchronization with a count clock, a counter decrements a counter value during activation of the first voltage comparison signal and increments the counter value during activation of the second voltage comparison signal. An oscillating circuit selects one of oscillation frequency bands by the counter value and regulates an oscillation frequency according to the control voltage within the selected oscillation frequency band to output an output clock. This makes it possible to secure a wide oscillation frequency range in response to variance in operating conditions or a reduction in a range of the control voltage and to regulate the oscillation frequency of the voltage controlled oscillator by the control voltage alone.

REFERENCES:
patent: 5382922 (1995-01-01), Gersbach et al.
patent: 6188289 (2001-02-01), Hyeon
patent: 6949981 (2005-09-01), Natonio et al.
patent: 6952124 (2005-10-01), Pham
patent: 7030711 (2006-04-01), Steinbach et al.
patent: 8-180676 (1996-07-01), None
patent: 9-284130 (1997-10-01), None

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