Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Patent
1996-06-26
1997-09-02
Mis, David
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
331 8, 331 25, 327157, 330281, 4552341, H03L 7089, H03G 320
Patent
active
056636890
ABSTRACT:
A charge pump that receives complimentary metal-oxide semiconductor (CMOS) input signals, has high noise immunity, low static error and works at low power supply voltages. The charge pump includes a current switch for receiving a control signal from a control circuit and for generating a charge signal, a loop filter having a first and second node, and a common-mode loop for sensing the charge signal from the current switch and for providing a voltage level adjustment signal to the first node of the loop filter in response thereto. The common-mode loop includes a sensing circuit for sensing the voltage level at the first and second node, an averaging circuit for producing an averaged voltage signal, a comparing circuit for comparing the averaged voltage signal to a reference signal to produce a feedback control output signal, and a feedback current source for adjusting the voltage level at the first node of the loop in response to the feedback control output signal.
REFERENCES:
patent: 4636748 (1987-01-01), Latham, II
patent: 4885554 (1989-12-01), Wimmer
patent: 4987387 (1991-01-01), Kennedy et al.
patent: 5126692 (1992-06-01), Shearer et al.
patent: 5166641 (1992-11-01), Davis et al.
patent: 5208546 (1993-05-01), Nagaraj et al.
patent: 5285114 (1994-02-01), Atriss et al.
patent: 5319320 (1994-06-01), Abe et al.
patent: 5363066 (1994-11-01), Chen et al.
patent: 5384502 (1995-01-01), Volk
patent: 5416691 (1995-05-01), Croughwell
patent: 5424689 (1995-06-01), Gillig et al.
patent: 5548833 (1996-08-01), Townsend
patent: 5592120 (1997-01-01), Palmer et al.
M. B. Ebler, D. W. Siljenberg and J. T. Trnka, "Charge Pump," IBM Technical Disclosure Bulletin, vol. 33, No. 4, Sep. 1990, pp. 252-254.
R. D. Gillingham, J. F. Mikos and J.D. Strom, "Differential Charge Pump," IBM Technical Disclosure Bulletin, vol. 33, No. 9, Feb. 1991, pp. 332-333.
Baumgartner Steven J.
Philpott Rick A.
Siljenberg David W.
International Business Machines - Corporation
Lynch David W.
Mis David
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