Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1981-04-06
1982-06-01
Pellinen, A. D.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
307499, 323901, G05F 316
Patent
active
043330479
ABSTRACT:
A current control circuit which can be used to provide starting current during the build-up of an input voltage, and terminate the starting current when the input voltage has reached a predetermined level. The preferred embodiment employs three FETs and one bipolar transistor, located in a total of only two isolation pockets on an integrated circuit chip. The first FET, which is scaled to operate in its saturated region while the second FET is in its resistive region, transmits a current received from the second FET as an output starting current during the initial portion of the input voltage build-up. During this time the second FET holds the gate-source voltage of the first FET to a level less than its pinch-off voltage. The third FET has its gate and source terminals connected in parallel with the first FET, and its drain connected to the base of the bipolar transistor, which is also connected to shunt current away from the first FET when appropriately gated. When the input voltage reaches a predetermined amount, the gate-source voltage of the third FET is elevated to the pinch-off voltage of the first FET, turning that device off. At the same time the bipolar transistor is gated into conduction and shunts the starting current which had previously been transmitted through the first FET.
REFERENCES:
patent: 3984761 (1976-10-01), Edington et al.
Ronald W. Russell and Thomas M. Frederiksen, "Automotive and Industrial Electronic Building Blocks", IEEE Journal of Solid-State Circuits, vol. SC-7, No. 6, Dec. 1972, pp. 446 to 454.
Adib R. Hamade and Jose F. Albarran, "A JFET/Bipolar Eight-Channel Analog Multiplexer", IEEE Journal of Solid-State Circuits, Dec. 1975, pp. 399 to 406.
Kiyoshi Fukahori, Yukio Nishikawa and Adib R. Hamade, "A High Precision Micropower Operation Amplifier", IEEE Journal of Solid-State Circuits, vol. SC-14, No. 6, Dec. 1979, pp. 1048 to 1058.
U.S. patent application Ser. No. 06/160,674, Filed Jun. 18, 1980, "Powerless Starting Circuit", Yukio Nishikawa.
Koppel Richard S.
Pellinen A. D.
Precision Monolithics, Inc.
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