Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1997-01-23
1998-12-29
Young, Brian K.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341155, H03M 112
Patent
active
RE0360147
ABSTRACT:
A voltage storage circuit, for use for example in an analogue-to-digital converter, includes an input switch element connected between an input node (IN) of the circuit and a first plate of a storage capacitor. The other plate of the capacitor is connected to a common terminal 3 of the circuit. A high-impedance amplifier element is connected to the first plate for providing at an output node (OUT) of the circuit an output voltage (V.sub.o) dependent upon the first plate potential (V.sub.c). The amplifier element has an FET input device whose gate electrode is connected to the first plate and whose source and drain electrode potentials are fixed in relation to the first plate potential (V.sub.c). Such a voltage storage circuit avoids charge injection to/from the amplifier element, with consequential charging/discharging of the storage capacitor, which would otherwise result from operation of the amplifier element
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Fujitsu Limited
Young Brian K.
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