Phase-compensated filter circuit with reduced power consumption

Amplifiers – Signal feedback – Phase shift means in loop path

Reexamination Certificate

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Details

C330S257000, C341S143000

Reexamination Certificate

active

11058194

ABSTRACT:
A filter circuit includes a plurality of integrator stages, each stage including a voltage-to-current converter to convert an input voltage into a current supplied to an output thereof and a capacitor coupled to the output of the voltage-to-current converter, a voltage charged in the capacitor being supplied to a next stage as an output of each stage, and a capacitor serving as a feed-forward coupling that couples the output of at least one stage of the plurality of integrator stages to a last output node.

REFERENCES:
patent: 4812779 (1989-03-01), Wagner
patent: 5155447 (1992-10-01), Huijsing et al.
patent: 5486790 (1996-01-01), Huijsing et al.
patent: 6150884 (2000-11-01), Fattaruso
patent: 6421257 (2002-07-01), MacKay et al.
patent: 6573790 (2003-06-01), Steensgaard-Madsen
patent: 6646426 (2003-11-01), Terashi
patent: 6750715 (2004-06-01), Allott et al.
Lucien J. Brecms, et al. “A 1.8-mW CMOS ΣΔ Modulator with Intergrated Mixer for A/D Conversion of IF Signals”; IEE Journal of Solid-State Circuits, vol. 35, No. 4, Apr. 2000.

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