Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1988-07-26
1990-02-27
Wong, Peter S.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
341136, 307448, 307576, G05F 308
Patent
active
049049224
ABSTRACT:
Output members in a matrix relationship having x and y inputs respectively receive signals in first and second pluralities cumulatively representing a digital value. These signals are decoded and are respectively introduced to the x and y inputs to activate a particular output member common to a selected x row and a selected y column. The output members in the preceding rows and preceding the activated output member in the selected row are also activated. Three-transistor (all of the same type) current sources provide constant currents to the activated output members. In each current source, a first transistor provides the constant current, a second transistor in each current source constitutes a switch operative in response to binary input signals, and a third transistor receives the constant current dependent upon the binary input to the second transistor. A circuit providing first and second reference voltages and including an operational amplifier produces a resultant voltage representing the difference between the reference voltages. The resultant voltage controls the current flowing through fourth and fifth transistors, preferably in series, thereby regulating the value of the first reference voltage. The amplifier output also regulates the current in the first transistor of each current cell, and the voltage from the fifth transistor biases the third transistor in each current cell toward a conductive state. The three transistors in each current source and the fourth and fifth transistors may be C-MOS transistors of the p type.
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patent: 4384274 (1983-05-01), Mao
patent: 4638241 (1987-01-01), Colles
patent: 4689607 (1987-08-01), Robinson
patent: 4706013 (1987-11-01), Kuo
patent: 4733196 (1988-03-01), Menniti et al.
Brooktree Corporation
Roston Ellsworth R.
Schwartz Charles H.
Wong Peter S.
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