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US 7,173,485 B2Granted
Phase-compensated filter circuit with reduced power consumption
AssigneeFujitsu Limited
InventorToshiaki Nagai
Life of this patent
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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.
Claims5
A filter circuit, comprising:
- 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;
- a capacitor serving as a feed-forward coupling that couples the output of at least one stage of said plurality of integrator stages to a last output node;
- and
- a voltage-to-current converter having an input thereof coupled to the output of a last stage of said plurality of integrator stages and an output thereof coupled to said last output node,
- wherein the voltage-to-current converter having the output thereof coupled to the last output node is a resistor.
2 more elements
A filter circuit, comprising:
- 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 said plurality of integrator stages to a last output node,
- wherein a first integrator stage of said plurality of integrator stages includes:
- an operational amplifier;
- a resistor coupled to an input of the operational amplifier;
- and
- a capacitor coupling an output of the operational amplifier to the input of the operational amplifier.
5 more elements
Dependencies are inferred from the claim text.