Oscillators – Solid state active element oscillator – Transistors
Reexamination Certificate
2005-07-12
2005-07-12
Le, Dinh T. (Department: 2816)
Oscillators
Solid state active element oscillator
Transistors
C331S17700V, C331S17700V
Reexamination Certificate
active
06917248
ABSTRACT:
VCO (voltage controlled oscillator) circuits typically exhibit a frequency dependent variation in their output signal with respect to a tuning voltage applied to a tuning port on the VCO circuit. For a fixed tuning voltage the VCO circuit forms a stable oscillator. However, the stable oscillator formed is susceptible to both internal and external noise sources. Forming a VCO circuit from components such as varactors facilitates frequency stability and decreased noise susceptibility of the VCO circuit. A VCO formed from such components advantageously uses a summed capacitance of two or more varactors to provide decreased phase noise. Using a summed capacitance of the varactors reduces changes in output signal frequency with respect to changes in tuning voltage and thereby reduces the effects of noise by reducing a slope of this dependence.
REFERENCES:
patent: 4904964 (1990-02-01), Peng et al.
patent: 4918406 (1990-04-01), Baumbach et al.
patent: 4999589 (1991-03-01), DaSilva
patent: 5694092 (1997-12-01), Oba et al.
patent: 6204734 (2001-03-01), Zhang et al.
patent: 6268778 (2001-07-01), Mucke et al.
patent: 6323736 (2001-11-01), Janson
patent: 6545555 (2003-04-01), Justice et al.
patent: 6621364 (2003-09-01), Grewing et al.
patent: 6650195 (2003-11-01), Brunn et al.
patent: 2003/0076139 (2003-04-01), Miyagawa et al.
patent: 0899866 (1999-03-01), None
A.M. Niknejad, J.L. Tham, and R.G. Meyer, “Fully-Integrated Low Phase Noise Bipolar Differential VCOs at 2.9 and 4.4 GHz”, Proceedings of the 25thEuropean Solid-State Circuits Conference, 1999, p. 198-201.
A. Kral, F. Behbahani and A.A. Abidi, “RF-CMOS Oscillators with Switched Tuning”, IEEE 1998 Custom Integrated Circuits Conference, p. 555-558.
Freedman & Associates
Le Dinh T.
SiGe Semiconductor Inc.
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