Electricity: power supply or regulation systems – Remote sensing
Patent
1977-09-21
1979-11-27
Goldberg, Gerald
Electricity: power supply or regulation systems
Remote sensing
307297, 307303, 323 9, 323 19, 323 22T, G05F 158, G05F 160
Patent
active
041763084
ABSTRACT:
A voltage regulator including a current regulator for maintaining predetermined currents in the voltage regulator is disclosed. The voltage regulator includes an output terminal for providing an output voltage; an adjustment terminal; and a control circuit connected to the output terminal at a level that differs from the voltage at the adjustment terminal by a predetermined voltage difference. The control circuit of the voltage regulator includes a resistive divider coupled between the output terminal and the adjustment terminal; a pair of transistors having their collectors connected in common and their bases respectively coupled to the resistive divider to provide a portion of the voltage difference between the output terminal and the adjustment terminal across their bases. The two transistors are adapted for operating at different current densities for providing a predetermined ratio in current flow through the pair of transistors when the voltage difference between the output terminal and the adjustment terminal is the predetermined voltage difference. The control circuit further includes a high-gain amplifier circuit connected to the emitters of the pair of transistors and to the output terminal for driving the output terminal to a maintained voltage level at which the current flow through the pair of transistors is at the predetermined current ratio and the voltage difference between the output terminal and the adjustment terminal is the predetermined voltage difference. The disclosed voltage regulator is useful as a negative voltage regulator.
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Nat. Semi-Conductor Corp. Application Note: AN-42, Feb. 1971, "IC Provides On-Card Regulation for Logic CK7S" by Widlar.
Nat. Semi-Conductor Corp. Application Note: AN-56, Dec. 1971, "1.2 Volt Reference" by R. C. Dobkin.
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Dobkin Robert C.
Pease Robert A.
Goldberg Gerald
National Semiconductor Corporation
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