Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1996-03-19
1998-07-14
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341146, H03M 166
Patent
active
057811393
ABSTRACT:
In a switched capacitor type digital-to-analog (D/A) converter, a group of n bits of the binary word are applied to n parallel branches of the D/A converter, respectively. In a given branch, the corresponding bit is applied to a control terminal of a corresponding switch associated with a corresponding switched capacitor. Depending on the logic level of the bit, the switched capacitor is charged to a reference voltage or remains discharged. Then, the switched capacitor of the given branch is coupled by a transfer switch in parallel with a summing capacitor to provide for charge redistribution. The capacitances of the switched capacitor and of the summing capacitor are equal. The time allocated for either discharging the switched capacitor or charge redistribution is made shorter than the time allocated for charging the capacitor. Charging/discharging the capacitor is accomplished via a common transistor.
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Henig Sammy S.
Hoff Marc S.
Laks Joseph J.
Thomson Multimedia S.A.
Tripoli Joseph S.
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