Sample and hold circuit
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorTsuguyasu Hatsuda
Life of this patent
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Abstract
A sample and hold circuit has an analog switch, a hold capacitor, a voltage-follower type operational amplifier, and a ringing cancel circuit. The ringing cancel circuit is interposed between a non-inverted input terminal of the operational amplifier and a signal ground so that the ringing cancel circuit is connected in parallel with the hold capacitor. The ringing cancel circuit is made up of a resistance and a capacitor connected in series with each other. With this arrangement, a high-speed, highly accurate, low power consumptive sample and hold circuit can be realized.
Claims8
A sample and hold circuit comprising:
- an analog switch having two terminals, one of which is connected to a signal input line;
- a voltage-follower type operational amplifier having a non-inverted input terminal connected to the other terminal of said analog switch;
- a hold capacitor interposed between said non-inverted input terminal of said operational amplifier and a constant-potential line;
- and
- a ringing cancel circuit interposed between said non-inverted input terminal of said operational amplifier and said constant-potential line said ringing cancel circuit comprising a resistance and a capacitor connected in series with each other.
Dependencies are inferred from the claim text.