Oscillators – Ring oscillators
Reexamination Certificate
2008-06-03
2008-06-03
Chang, Joseph (Department: 2817)
Oscillators
Ring oscillators
C331S185000
Reexamination Certificate
active
07382203
ABSTRACT:
A delay circuit, which is included in a ring oscillator, comprises a current source for providing a current; a first circuit coupled to the current source for receiving an input signal and producing an output signal; a second circuit coupled to the current source and the first circuit; a first adjustable impedance element coupled to the first circuit; a second adjustable impedance element coupled to the second circuit; and a control circuit coupled to the first adjustable impedance element and the second adjustable impedance element for producing a first control signal to control a first resistance of the first adjustable impedance element and producing a second control signal to control a second resistance of the second adjustable impedance element; wherein the first adjustable impedance element includes at least one transistor operated in linear region, and the second adjustable impedance element also includes at least one transistor operated in linear region.
REFERENCES:
patent: 2006/0091967 (2006-05-01), Iozsef et al.
patent: 2006/0097805 (2006-05-01), Bas et al.
Behzad Razavi, Design of Analog CMOS Integrated Circuits, Jan. 1, 2001, p. 510-521, Chapter14, McGraw-Hill, Boston.
Chang Joseph
Hsu Winston
REALTEK Semiconductor Corp.
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