Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1981-11-06
1983-04-26
Miller, C. D.
Communications: electrical
Audible indication
Percussion-type sound producer
307571, H03K 1302
Patent
active
043814999
ABSTRACT:
A monolithic integrable R-2R resistor network comprises a number of series resistors connected to a terminal resistor; and a plurality of 2R resistor units each capable of being switched by two electronic switches either to ground or to another reference point, a different plurality of 2R resistor units being coupled to the nodes between each of the series resistors, to the node between the terminal resistor and the last resistor of the series resistors and to the node ahead of the first resistor of the series resistors. To compensate for the effects of the variations of the switch resistances caused during manufacture by process parameter fluctuations upon the accuracy of a D/A converter, a switch structure is inserted at each of the nodes which, with respect to the two electronic switches, is of the same kind, and which is permanently in an electrically conducting state. Preferably, there are used insulated-gate field-effect transistors and insulated-gate field-effect transistor structures, the identical electrodes of which, for example, the source electrodes, are directly connected to each of the nodes.
REFERENCES:
patent: 3755807 (1973-08-01), Brown
patent: 3940760 (1976-02-01), Brokaw
patent: 4267550 (1981-05-01), Cecil
patent: 4308467 (1981-12-01), Kolluri
Hill Alfred C.
IT&T Industries, Inc.
Miller C. D.
O'Halloran John T.
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