Oscillators – Relaxation oscillators
Reexamination Certificate
2007-10-30
2009-11-03
Pascal, Robert (Department: 2817)
Oscillators
Relaxation oscillators
C331S034000, C331S03600C, C331S179000
Reexamination Certificate
active
07612624
ABSTRACT:
An RC oscillation circuit and method capable of adjusting an oscillation frequency includes: an RC oscillator including a variable resistor and a variable capacitor, the RC oscillator generating an RC oscillating signal having a frequency determined by a resistance of the variable resistor and a capacitance of the variable capacitor; a counter counting a clock number of a reference oscillating signal corresponding to one period of the RC oscillating signal to generate a first count value, the reference oscillating signal having a preset frequency; and a frequency controller controlling a frequency of the RC oscillating signal by determining the resistance of the variable resistor and the capacitance of the variable capacitor such that a difference between the first count value and a preset second count value is smaller than a preset first critical value.
REFERENCES:
patent: 5180991 (1993-01-01), Takashima
patent: 5543754 (1996-08-01), Onodera
patent: 5702426 (1997-12-01), Pons et al.
patent: 6882235 (2005-04-01), Kappes et al.
patent: 2008/0150646 (2008-06-01), Chen
patent: 2001285056 (2001-10-01), None
Cho Koon Shik
Lee Kwang Mook
Lim Joon Hyung
Park Tah Joon
Johnson Ryan J.
Lowe Hauptman & Ham & Berner, LLP
Pascal Robert
Samsung Electro-Mechanics Co. Ltd.
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