Oscillators – With particular source of power or bias voltage
Reexamination Certificate
2006-09-12
2008-10-07
Chang, Joseph (Department: 2817)
Oscillators
With particular source of power or bias voltage
C331S17700V
Reexamination Certificate
active
07432773
ABSTRACT:
Current sources are selectively coupled to a current controlled frequency determining circuit of an oscillator. A buffer amplifier has an input coupled to the current controlled frequency determining circuit of the oscillator and the buffer amplifier output is selectively coupled to the current sources not coupled to the frequency determining circuit of the oscillator. The buffer amplifier output maintains substantially the voltage of the current controlled frequency determining circuit on each of the current sources not coupled to the frequency determining circuit so that when any current source is coupled thereto, there is substantially no voltage difference therebetween. This substantially prevents generation of undesirable frequency spikes during coupling of the current sources to the frequency determining circuit of the oscillator.
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Howard C. Yang et al; “A Low Jitter 0.3-165 MHz CMOS PLL Frequency Synthesizer for 3 V/5 V Operation”; IEEE Journal of Solid-State Circuits, IEEE Service Center, Piscataway, NJ, US, vol. 32, No. 4, Apr. 1997.
International Search Report for PCT/US2006/041585 Mailed Apr. 12, 2007.
Kuppusamy Vanitha
Rogers Clark
Baker & Botts L.L.P.
Chang Joseph
Microchip Technology Incorporated
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