Polyphase filter with integrators

Details Polyphase filter with integrators Polyphase filter with integrators

2008-05-20

2008-05-20

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C455S313000

Reexamination Certificate

active

07375582

ABSTRACT:
Polyphase filters comprise a plurality of filters each filter having passive elements. The filters are provided with integrators comprising amplifiers with admittance elements in feedback paths to create one or more other poles not situated on the negative imaginary axis in the plane-zero plot. A conductance element couples an output of an integrator of the integrators to an input of a previous integrator for introducing a frequency shift for at least one pole in the plane pole-zero plot. A capacitor couples an output of the integrator to an input of a next integrator for improving the quality factor of the polyphase filter. A signal inversion allows conductance elements to have negative values necessary for locating at least one pole at the most optimal location in the plane pole-zero plot.

REFERENCES:
patent: 4355335 (1982-10-01), Imaide et al.
patent: 6009349 (1999-12-01), Mouchawar et al.
patent: 6236847 (2001-05-01), Stikvoort
patent: 6346850 (2002-02-01), Essink
patent: 6388543 (2002-05-01), Molnar et al.
patent: 6590943 (2003-07-01), Ali
patent: 6987966 (2006-01-01), Wu et al.

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