Oscillators – With frequency adjusting means – Step-frequency change
Patent
1998-05-29
2000-11-14
Mis, David
Oscillators
With frequency adjusting means
Step-frequency change
331 16, 331 36C, 331117FE, 331177V, 455260, H03B 512, H03L 7099, H03L 716
Patent
active
06147567&
ABSTRACT:
A method and apparatus for synthesizing high-frequency signals is disclosed that overcomes integration problem associated with prior implementations while meeting demanding phase noise and other impurity requirements. In one embodiment, a phase-locked loop (PLL) frequency synthesizer is disclosed having a voltage controlled oscillator (VCO) with a variable capacitance that includes a discretely variable capacitance in conjunction with a continuously variable capacitance. The discretely variable capacitance may provide coarse tuning adjustment of the variable capacitance, and the continuously variable capacitance may provide a fine tuning adjustment of the variable capacitance. In a further detail, a digital control signal is disclosed to control the overall capacitance for the discretely variable capacitance circuit, and a variable control signal is disclosed to control an overall capacitance for the continuously variable capacitance circuit. In addition, the output frequency may be varied by adjusting either the digital control word or the variable control word.
REFERENCES:
patent: 3538450 (1970-11-01), Andrea et al.
patent: 3571743 (1971-03-01), Menkes
patent: 3899746 (1975-08-01), Gammel
patent: 4009448 (1977-02-01), Hopwood et al.
patent: 4099137 (1978-07-01), Alm, Jr. et al.
patent: 4179670 (1979-12-01), Kingsbury
patent: 4204174 (1980-05-01), King
patent: 4205272 (1980-05-01), Kumagai
patent: 4258724 (1993-11-01), Tanis et al.
patent: 4484153 (1984-11-01), Borras et al.
patent: 4602220 (1986-07-01), Kurihara
patent: 4686488 (1987-08-01), Attenborough
patent: 4713631 (1987-12-01), Enderby et al.
patent: 4758802 (1988-07-01), Jackson
patent: 4800432 (1989-01-01), Barnett et al.
patent: 4805198 (1989-02-01), Stern et al.
patent: 4888564 (1989-12-01), Ishigaki
patent: 4893087 (1990-01-01), Davis
patent: 4905306 (1990-02-01), Anderson
patent: 4926140 (1990-05-01), Schenberg
patent: 4926144 (1990-05-01), Bell
patent: 4980653 (1990-12-01), Shepherd
patent: 4998077 (1991-03-01), Nanni et al.
patent: 5034703 (1991-07-01), Schumacher
patent: 5036295 (1991-07-01), Kamitani
patent: 5038117 (1991-08-01), Miller
patent: 5055802 (1991-10-01), Hietala et al.
patent: 5079521 (1992-01-01), Gaskell et al.
patent: 5117206 (1992-05-01), Inamura
patent: 5157358 (1992-10-01), Benson
patent: 5175884 (1992-12-01), Suarez
patent: 5224132 (1993-06-01), Goldberg
patent: 5258720 (1993-11-01), Tanis et al.
patent: 5281927 (1994-01-01), Parker
patent: 5315269 (1994-05-01), Fujii
patent: 5369376 (1994-11-01), Leblebicioglu
patent: 5379003 (1995-01-01), Bizen
patent: 5446767 (1995-08-01), Nakagawa et al.
patent: 5495205 (1996-02-01), Parker et al.
patent: 5517534 (1996-05-01), Knierim
patent: 5534825 (1996-07-01), Goma et al.
patent: 5539359 (1996-07-01), Goma
patent: 5576667 (1996-11-01), Goma
patent: 5581584 (1996-12-01), Inoue et al.
patent: 5625325 (1997-04-01), Rotzoll et al.
patent: 5644270 (1997-07-01), Moyer et al.
patent: 5648744 (1997-07-01), Prakash et al.
patent: 5686864 (1997-11-01), Martin et al.
patent: 5691669 (1997-11-01), Tsai et al.
patent: 5705955 (1998-01-01), Freeburg et al.
patent: 5739730 (1998-04-01), Rotzoll
patent: 5740524 (1998-04-01), Pace et al.
patent: 5748043 (1998-05-01), Koslov
patent: 5758276 (1998-05-01), Shirakawa
patent: 5808531 (1998-09-01), Nakano
patent: 5844868 (1998-12-01), Takahashi et al.
patent: 5852384 (1998-12-01), Sakakura et al.
patent: 5856763 (1999-01-01), Reeser et al.
patent: 5867069 (1999-02-01), Kiser
patent: 5898345 (1999-04-01), Namura et al.
patent: 5909150 (1999-06-01), Kosteinik et al.
patent: 5936474 (1999-08-01), Rousselin
patent: 5963100 (1999-10-01), Tolson et al.
Kral et al., "RF-CMOS Oscillators with Switched Tuning," Custom IC Conference, Santa Clara, CA, 4 sheets appearing on pp. 555-558 of the proceedings (May 1998).
Cong, et al., "Multigigahertz CMOS Dual-Modulus Prescalar IC" IEEE Journal of Solid-State Circuits, vol. 23, No. 5 (Oct. 1988) p. 1189-1194.
Duncan, et al., "A 1 GHz Quadrature Sinusoidal Oscillator," IEEE 1995 Custom Integrated Circuits Conference (1995) p. 6.2.1-6.2.4.
Craninckx, et al., "A 1.8-GHz CMOS Los-Phase-Noise Voltage-Controlled Oscillator with Prescaler," IEEE Journal of Solid-State Circuits, vol. 30, No. 12 (Dec. 1995) p. 1474-1482.
Chang, et al., "A 1.2 GHz CMOS Dual-Modulus Prescaler Using New Dynamic D-Type Flip-Flops," IEEE Journal of Solid-State Circuits, vol. 31, No. 5 (May 1996) p. 749-752.
Rudell, et al., "Second Generation Multi-Standard Monolithic CMOS RF Transceiver," University of California, Berkeley, Slides 1 through 9 (Jun. 1996).
Cho, et al., "Multi-Standard Monolithic CMOS RF Transceiver," University of California, Berkeley, Slides 1 through 26 (Jun. 1996).
Craninckx et al., "A 1.75-GHz/3-V Dual-Modulus Divide-by-128/129 Prescaler in 0.7-.mu.m CMOS," IEEE Journal of Solid-State Circuits, vol. 31, No. 7 (Jul. 1996) p. 890-897.
National Semiconductor Corp,. "LMX2330L/LMX2331L/LMX2332L PLLatinum .TM. Low Power Dual Frequency Synthesizer for RF Personal Communications" Datasheet (Feb. 1998) p. 1-16.
Scott Jeffrey W.
Welland David R.
Mis David
Peterman Brian W.
Silicon Laboratories Inc.
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