Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1997-12-23
1999-11-16
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
327 94, H03M 134
Patent
active
059865997
ABSTRACT:
At a sampling operation, an analog signal and an inverted signal thereof are respectively supplied to first and second sampling capacitor elements, DC components of input signals are supplied to first and second capacitors, and reference voltages are supplied to third and forth capacitors. At the time of the comparison operation, the reference voltages are respectively supplied to the first and the second sampling capacitor elements, the first and the third capacitors and the second and the forth capacitors are connected in parallel, respectively. Voltages of connection nodes thereof are input to an operational amplifier, therefore an A/D converter is obtained wherein a fluctuation of operation points of the operational amplifier at the time of the sampling operation and at the time of the comparison operation can be kept small, an improvement of a conversion precision and an operation stability can be achieved without being influenced by fluctuation of the DC component of the analog signal, and a high precision can be achieved.
REFERENCES:
patent: 4845383 (1989-07-01), Lida
patent: 5654713 (1997-08-01), Mayes et al.
patent: 5821780 (1998-10-01), Hasegawa
Kananen Ronald P.
Sony Corporation
Williams Howard L.
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