H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/102, 354/90
H03M 1/00 (2006.01)
Patent
CA 1130921
ABSTRACT A monolithic digital/analog converter comprising N current sources provides weighted currents to associated switching circuits which steer the weighted currents either to an output summing line or to a dump line under control of the bits of the word to be converted. Set of the pairs comprising a current source and a switching circuit are divided into two groups of distinct structures. The first group comprises n pairs and the second one comprises m pairs with N = n+m. The continuity between the currents provided by the sources of the two groups and their scaling are assured by three auxiliary sources, namely a master source for monitoring the n high order currents, an high order image source and a master source for monitoring the m low order currents, and two scaling circuits, namely a high order current scaling circuit and a low current scaling circuit for controlling the value of the current provided by the low order current monitoring source from the current provided by the high order image source. In addition to the bit controls, the converter has two controls called "Force" and "Inhibit". The "Force" control forces the currents provided by all the sources into the output summing line whatever the converter input bit pattern. The "Inhibit" control causes the currents provided by all the sources to be sent into the dump line.
307013
Azzis Daniel
Delaporte Francois X.
International Business Machines Corporation
Na
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