Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1990-06-15
1992-06-09
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307522, 328167, H03K 500, H03K 906
Patent
active
051210096
ABSTRACT:
An electrical signal filter composed of a pair of cascaded filter sections in which the group delays of the two filter sections are matched so that their non-linear effects cancel in the passband, resulting in an overall linear phase. In addition, the attenuation slope after the first null in one filter section's stopband response is complemented by the other filter's stopband attenuation. This prevents the overall stopband attenuation from falling to extremely low values as with some filters, which, in turn, limits the time domain overshoot. The passband group delay and stopband attenuation characteristics are controlled by appropriate selection of the passband ripple and filter order number parameters of the filter. In a preferred embodiment, the two filter sections are of the elliptic and Chebyschev type. The invention can be implemented as analog-component active filter circuit or as a digital filter.
REFERENCES:
patent: 3609567 (1971-09-01), Webb
patent: 3736517 (1973-05-01), Lim
patent: 3845423 (1974-10-01), Scheine
patent: 4050023 (1977-09-01), Edgar
patent: 4179665 (1979-12-01), Gregorian
patent: 4257006 (1981-03-01), Schaumann
patent: 4338530 (1982-07-01), Six et al.
patent: 4752902 (1989-06-01), Goldberg
patent: 4890065 (1989-12-01), Laletin
patent: 4924189 (1990-05-01), Senn et al.
Mitra; "Synthesizing active Filters"; Jan. 1969.
Cunningham Terry D.
Miller Stanley D.
NovAtel Communications Ltd.
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