Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1992-01-14
1993-01-26
Westin, Edward P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307498, 307555, 307562, 328160, 330252, 330260, 330306, H03F 345, H03K 520
Patent
active
051824779
ABSTRACT:
The present invention is a new design for transconductance elements useful in high-frequency filters such as fully differential state-variable biquads. The present invention enjoys a large dynamic range. It is built with simple circuitry to reduce parasitic capacitance which impedes high-frequency operation. It is easily tunable for use in programmable filters. It is configured in a fully differential circuit and operates on five volts. The present invention is also very useful for implementing dual-input or multiple input transconductance elements. By incorporating additional current sources in the present invention, another degree of freedom is added to the determination of pole frequency and pole quality factors, when the transconductance is used as a biquad filter building block.
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patent: 4292597 (1981-09-01), Niimura et al.
patent: 4823092 (1989-04-01), Pennock
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De Veirman Geert A.
Yamasaki Richard G.
Roseen Richard
Silicon Systems Inc.
Westin Edward P.
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