Amplifiers – Signal feedback – Phase shift means in loop path
Reexamination Certificate
2007-02-06
2007-02-06
Barnie, Rexford (Department: 2819)
Amplifiers
Signal feedback
Phase shift means in loop path
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.
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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.
Barnie Rexford
Fujitsu Limited
Mai Lam T.
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