Electronic device for controlling a reactance value for a reacti

Details Electronic device for controlling a reactance value for a reacti Electronic device for controlling a reactance value for a reacti

1997-01-03

1998-07-07

Nelms, David C.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

331135, 331158, 331117R, H03L 700, H03B 520, H03B 100

Patent

active

057775222

ABSTRACT:
A capacitor (200) having an actual physical capacitance value of Cact and is coupled to an oscillator (36). The oscillation frequency of the oscillator (36) can be changed by changing the effective capacitance of the capacitor (200). The actual capacitance (Cact) of capacitor (200) can be altered to appear to be any effective capacitance (Ceff) between zero and a value much greater than Cact by using a Miller effect. In order to alter the effective capacitance of the capacitor (200), a representation of the output osculation signal (16) is provided to a frequency adjust stage (22). The frequency adjust stage either passed the signal (16) with 0.degree. phase shift or with 180.degree. phase shift. In addition to shifting the phase, the stage (22) will amplify or attenuate the signal (16) to result in the phase shifted and amplified/attenuated frequency adjusting signal (24). By providing the signals (16 and 24) to opposite ends of the capacitor (200), Miller affect will alter the effective capacitance of the capacitor (200) thereby altering a frequency of the oscillator (36).

REFERENCES:
patent: 3614649 (1971-10-01), Gerig
patent: 4234858 (1980-11-01), Gomi
patent: 4583059 (1986-04-01), Konno
patent: 4916412 (1990-04-01), Nordholt et al.
patent: 5030926 (1991-07-01), Walden
patent: 5596301 (1997-01-01), Rybicki et al.
Rybicki et al., Application No. 08/435,104 filed May 4, 1995.
Paul R. Gray, et al., "Anaylsis and Design of Analog Integrated Circuits --3rd Edition", pub. by John Wiley & Sons, Inc., Canada 1993, Chapter 9.42 Methods of Compensation, pp. 612-621.

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