Filter control circuit

Details Filter control circuit Filter control circuit

1990-05-11

1991-04-09

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307491, 3072966, 328167, H03K 500, H03K 301

Patent

active

050067338

ABSTRACT:
A filter control circuit uses a compound FET as a resistance element. The compound FET includes parallel FETs having different gate widths to provide different drain-source resistance characteristics, which overlap to provide an extended operating region, that approaches a linear curve for the combined resistance characteristic. The control voltage used to control the compound FET may be coupled to like compound FETs in the filter being controlled.

REFERENCES:
patent: 3604947 (1971-09-01), Puthuff
patent: 4263519 (1981-04-01), Schade, Jr.
patent: 4509019 (1985-04-01), Banu et al.
patent: 4918338 (1990-04-01), Wong
"On-Chip Automatic Tuning for CMOS Continuous Time Filter", M. Banu et al., Digest, IEEE 1985 International Solid-State Circuit Conference, New York.
"Design of MOS VLSI Circuits for Telecommunications", Y. Tsividis et al., Prentice Hall, N.J., p. 348.

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