H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/97
H03M 1/66 (2006.01) H03M 1/00 (2006.01)
Patent
CA 1194238
INTEGRATABLE D/A CONVERTER By CHRISTOPHER W. KAPRAL Abstract of Disclosure A D/A converter having a feedback capacitor Cl between the inverting input and output of an operational amplifier Al having a virtual ground on the inverting input. First switch means is sequentially responsive to binary values of bits of a digital input word for connecting a bus line to either a reference voltage or ground. Second switch means alternately connects opposite sides of a second capacitor C2=Cl between ground and the bus line for sampling the logic level of a bit, and across Cl for redistributing sampled charge during each bit. The charge on Cl is transferred to a storage capacitor and then reset to zero at the end of each word. In an alternate embodiment, one of a pair of switched capacitors samples the logic level while the other is connected across Cl for redistributing stored charge. In another embodiment, binary weighted capacitors sample the logic levels of bits in pairs and are simultaneously connected across Cl for redistributing charge. In another embodiment, n switched capacitors simultaneously sample the logic levels of associated bits and are sequentially connected across Al for redistributing charge.
406314
Kapral Christopher W.
Gte Automatic Electric Incorporated
R. William Wray & Associates
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