Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1974-07-05
1976-01-13
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
H03K 1304
Patent
active
039328635
ABSTRACT:
A digital-to-analog converter utilizing a set of high-speed current switches each comprising a buffer transistor and a switching transistor interconnected with a common resistor in such a fashion that the buffer transistor in the normal "off" state supplies the common resistor with a current of predetermined magnitude to bias the switching transistor to cut-off; a control pulse coupled through an input diode cuts off the buffer transistor, the bias at the switching transistor is thereby eliminated, and the switching transistor immediately conducts. The magnitude of current supplied to a summing point by each switching transistor is fixed in accordance with a weighted relationship determined by the order of the binary bit represented by the respective transistor; for one group of switching transistors, the current levels are determined by current-dividing networks individual to each transistor; in a second group, the current levels are determined by a ladder network interconnecting the transistors to the summing point; in a third group, each transistor is arranged to conduct the correct amount of current by appropriate loading of its output circuit. Special means are provided for assuring smooth transitions between positive and negative outputs, and to compensate for the effects of ambient temperature variations.
REFERENCES:
patent: 2736889 (1956-02-01), Kaiser et al.
patent: 2945220 (1960-07-01), Lesti et al.
patent: 3247397 (1960-04-01), Kopek et al.
Analog Devices Inc.
Miller Charles D.
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