Analog-to-digital converter
AssigneeSanyo Electric Co., Ltd.
InventorsTakashi Asano, Atsushi Wada, Shigeto Kobayashi
Life of this patent
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Abstract
In an analog-to-digital (A-D) converter, an A-D conversion circuit samples an analog signal and converts it to a digital value of a predetermined bit number less than a targeted bit number. An amplifier circuit is provided in parallel to the A-D conversion circuit, and holds the signal sampled by the A-D conversion circuit or amplifies it by a predetermined gain. A first source follower circuit for the amplifier circuit and a second source follower circuit for the A-D conversion circuit are provided separately at the output side of a sample-and-hold circuit.
Claims16
An analog-to-digital (A-D) converter, which converts an analog signal to a digital signal of a predetermined bit number a plurality of times, the A-D converter comprising:
- an A-D conversion circuit which samples an inputted analog signal and converts it to a digital value of a bit number less than the predetermined bit number;
- a first holding circuit which holds the inputted analog signal;
- and
- a buffer circuit provided on a path connecting an input side of said A-D conversion circuit with an input side of said first holding circuit.
An analog-to-digital (A-D) converter, which converts an analog signal to a digital signal a plurality of times, the A-D converter comprising:
- a predetermined circuit element which outputs an analog signal;
- an A-D conversion circuit which samples the analog signal outputted from said predetermined circuit element and converts it to a digital value of a predetermined bit number less than a targeted bit number;
- and
- a first holding circuit, provided in parallel with said A-D conversion circuit, which at least holds the analog signal sampled by said A-D conversion circuit,
- wherein a buffer circuit for said first holding circuit and a buffer circuit for said A-D conversion circuit are separately provided at an output side of said predetermined circuit element.
Dependencies are inferred from the claim text.