Constant-voltage generator for integrated circuits
AssigneeU.S. Philips Corporation
InventorGilbert Y. M. Gloaguen
Life of this patent
Estimating the term…
Abstract
A constant voltage generator includes means for compensating for deviations of its output voltage that are due to variations in the supply voltage or changes in ambient temperature. The generator features a negative feedback resistor connected in the emitter circuit of a transistor between whose emitter and collector branches said output voltage appears. A current flows through this resistor which is supplied by another transistor whose current varies as a function of supply voltage variations. The generator may be used for supplying bias voltages to logic circuits.
Claims12
A constant voltage generator for integrated circuits comprising, first and second transistors each having emitter, collector and base electrodes, means coupling the collector of the second transistor to the base of the first transistor, a coupling network coupling the collector of the first transistor to the base of the second transistor, said coupling network comprising a first resistor connected between a first circuit point and the base of the second transistor and a diode connected between said first point and a second circuit point, a second resistor connected between the emitter of the second transistor and the second point, and means connecting a tap point on the second resistor to the emitter of the first transistor.
A voltage generator as claimed in any of the preceding claims, characterized in that said second resistor comprises two separate resistor elements connected in series.
A voltage regulator circuit comprising, first and second terminals for receiving operating voltages for the circuit, an output terminal for supplying a stabilized voltage independent of the operating voltages and ambient temperature, first and second transistors each having emitter, collector and base electrodes, a diode, first means coupling the collector of the second transistor to the base of the first transistor, a coupling network including a first resistor for coupling the collector of the first transistor to the base of the second transistor, first means connecting said diode in series with the first resistor between the second terminal and the base of the second transistor, a second resistor connected between the emitter of the second transistor and the second terminal thereby forming an emitter circuit for the second transistor, second means coupling the collector of the first transistor to said first terminal and to said output terminal, and second means connecting the emitter of the first transistor to the emitter circuit of the second transistor so as to produce a negative feedback component in said emitter circuit of the second transistor.
Dependencies are inferred from the claim text.