Oscillators – Relaxation oscillators
Reexamination Certificate
2006-12-01
2008-09-02
Chang, Joseph (Department: 2817)
Oscillators
Relaxation oscillators
C331S144000, C331S111000, C331S11300A
Reexamination Certificate
active
07420431
ABSTRACT:
An RC oscillator integrated circuit includes: an active current mirror connected to an external resistor, for receiving a current signal corresponding to a voltage signal applied to the external resistor, performing 1/N-times division of the received current signal according to an input clock signal, and generating a 1/N-times current signal; an oscillation circuit for generating an output voltage corresponding to a charging- or discharging-operation of a capacitor via a current path formed by the active current mirror; a feedback switching circuit for controlling a charging- or discharging-path of the capacitor by a feedback of an output signal Vo of the oscillation circuit; and a divider for generating not only a first clock signal capable of driving the active current mirror according to the output signal of the oscillation circuit, but also a second output clock signal having a compensated mismatch of the active current mirror.
REFERENCES:
patent: 4714901 (1987-12-01), Jain et al.
patent: 6680656 (2004-01-01), Chen
patent: 6873216 (2005-03-01), Seya
patent: 6917249 (2005-07-01), Kuo et al.
patent: 2006/0181360 (2006-08-01), Mirow
Hwang Jong-Tae
Jung Moon-Sang
Kim Dae-Ho
Kim Dong-Hwan
Chang Joseph
Fairchild Korea Semiconductor Ltd.
Sidley Austin LLP
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