Variable impedance circuit providing reduced distortion

Details Variable impedance circuit providing reduced distortion Variable impedance circuit providing reduced distortion

1993-03-03

1995-01-03

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

334 15, H03H 700, H03H 512

Patent

active

053790081

ABSTRACT:
An electronic circuit (300) includes first (302) and second (304) variable impedance devices coupled together. The first (302) and second (304) variable impedance devices are designed such that each exhibits a transfer function which is substantially inverse with respect to the other about the operating point of the electronic circuit. This provides for an electronic circuit which exhibits very low distortion characteristics. Circuits such as tunable filters, voltage-controlled oscillators (VCOs), receivers, etc. will benefit from using an electronic circuit (300) which exhibits such low distortion characteristics.

REFERENCES:
patent: 3217096 (1965-11-01), Caprio et al.
patent: 3723884 (1973-03-01), Asplin
patent: 4588958 (1986-05-01), Katz et al.
patent: 4839617 (1989-06-01), Speake
patent: 5166646 (1992-11-01), Avanic et al.
patent: 5173835 (1992-12-01), Cornett et al.
Article: "Distortion in Variable-Capacitance Diodes" by Robert G. Meyer and Mark L. Stephens, IEEE Journal of Solid-State Circuits, vol. SC-10, No. 1, Feb. 1975 (pp. 47-54).

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