Capacitive tuning network for low gain digitally controlled...

Details Capacitive tuning network for low gain digitally controlled... Capacitive tuning network for low gain digitally controlled...

2007-05-01

2007-05-01

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

C331S179000, C331S17700V

Reexamination Certificate

active

11049560

ABSTRACT:
According to one exemplary embodiment, a digitally controlled oscillator includes a capacitive tuning network, where the capacitive tuning network controls a frequency of an output signal of the digitally controlled oscillator. The capacitive tuning network includes a switched capacitor array, where a change of a first capacitance of the switched capacitor array causes the capacitive tuning network to change by a second capacitance, and where the first capacitance is larger than the second capacitance. According to this exemplary embodiment, the capacitive tuning network further includes a first capacitor coupled in parallel with the switched capacitor array. The first capacitor has a third capacitance, which is larger than the first capacitance. The capacitive tuning network further includes a second capacitor coupled in series with the first capacitor and the switched capacitor array. The second capacitor can have a fourth capacitance, where the third capacitance is larger than the fourth capacitance.

REFERENCES:
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patent: 6882064 (2005-04-01), Glenn
Staszewski et al,Just-in-time Gain Estimation of an RF Digitally-Controlled Oscillator for Digital Direct Frequency Modulation, 50 IEEE Transactions on Circuits and Systems, 887-892 (2003).
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McMahill, et al,A 2.5 MB/s GFSK 5.0Mb/s 4-FSK Automatically calibrated Sigma Delta Frequency synthesizer, 37 IEEE Journal of Solid State Circuits, (Jan. 2002).
Staszewski et al,All-Digital Phase Domain TX Frequency Synthesizer for Bluetooth Radios in 0.13um CMOS, §15.3, IEEE ISSCC (2004).

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