Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1988-10-24
1991-03-12
Callahan, Timothy P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328167, 328155, H03K 500, H03B 100
Patent
active
049995227
ABSTRACT:
A circuit forming an active RC filter for use as a band-stop filter in high and very-high frequency domains, having a second order transfer function, comprising a circuit that includes a building block for performing a filtering and amplifying function, and a building block S.sub.3 for performing the summation V.sub.S of the circuit output signal and the signal V.sub.E applied to the input E of the circuit, characterized in that the filter building block is formed by a series arrangement of two filter building blocks F.sub.1 and F.sub.2 each having a first order all-pass function, and in that the circuit also includes an amplifier building block A.sub.1 in a series arrangement with the filter building blocks F.sub.1, F.sub.2, inserted between the output of the latter building blocks and the output of the circuit, in that the input signal V.sub.E is applied on the other hand to the summation building block S.sub.3 through an amplifier A.sub.2, and in that the summation building block S.sub.3 is formed by coupling the outputs of the amplifier building blocks A.sub. 1 and A.sub.2 for forming the circuit output S at which the output signal V.sub.S is available and in that each building block F.sub.1 and F.sub.2 comprises a phase-shifting bridge associated to an amplifier stage.
REFERENCES:
patent: 3932819 (1976-01-01), Spencer
patent: 4137510 (1979-01-01), Iwahara
patent: 4388595 (1983-06-01), Brooks
patent: 4716388 (1987-12-01), Jacobs
Callahan Timothy P.
Lobato Emmanuel J.
U.S. Philips Corp.
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