Low noise oscillators and tracking filters

Details Low noise oscillators and tracking filters Low noise oscillators and tracking filters

1993-06-03

1994-12-06

Gross, Anita Pellman

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330252, 330253, 330305, 330306, H03H 100, H03H 300

Patent

active

053714750

ABSTRACT:
A gyrator based resonator comprises first and second differential amplifiers cross coupled to form a quadrature phase voltage controlled oscillator. The differential amplifier circuits include matched transistor pairs and associated transconductance adjusting components to control the resonant frequency of the resonator. Transconductance delay and admittance loss elements are also provided and these elements serve to control the loop gain of the resonator. A loop gain greater than unity results in the resonator oscillating while a loop gain less than unity produces a bandpass filter. A resonator having gain less than unity may be slaved to a similar resonator having gain adjusted to be greater than unity thus creating a low noise oscillator and tracking filter.

REFERENCES:
patent: 4460872 (1984-07-01), Mattisson
patent: 5172076 (1992-12-01), Brown
patent: 5185581 (1993-02-01), Brown
"Phase Noise in Signal Sources (Theory and Applications)", W. P. Robins, 1982, Peter Peregrinus Ltd.
"Design Considerations in High-Frequency CMOS Transconductance Amplifier Capacitor (TAC) Filters", Krummenacher, 1989 IEEE Int'l Symposium on Circuits and Systems.
"Analog Integrated Circuit Design", Van Nostrand Reinhold Ltd., Canada, 1972, pp. 291-292.
"Electronic and Radio Engineering", F. E. Terman, 4th Edition, McGraw Hill Book Company Inc., 1955, New York, p. 45.
"Synthesizing Active Filters", S. Mitra, IEEE Spectrum, Jan. 1969, pp. 47-63.

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