Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1988-02-16
1989-03-28
Wong, Peter S.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
323316, 323907, G05F 322
Patent
active
048167428
ABSTRACT:
Various voltage and current sources which are substantially independent of the positive supply rail are provided, some of which are also temperature independent. The basic NPN-type transistor circuit common to all provided sources generally comprises: a cross-coupled current stabilizer having first and second cross-coupled transistors where the emitter area of the first transistor is larger than the emitter area of the second transistor, a third transistor having an emitter coupled to the collector of the second cross-coupled transistor, a fourth transistor arranged as a diode and having a base coupled to the base of the third transistor and an emitter coupled to the collector of the first transistor; a first resistor coupled between the emitter of the first cross-coupled transistor and the negative rail; a second resistor coupled between the positive rail and the collector of said third transistor; a fifth transistor having its base and emitter coupled to the base and emitter of the second cross-coupled transistor to act as a current mirror thereof; and a sixth transistor coupled between the positive rail and the collector of the fifth current mirror transistor and in cascode relationship therewith. A current source is further created by coupling the base of an additional transistor to the emitter of the fifth transistor. Additional transistors and resistors are utilized in accord with various embodiments of the invention to provide multiple current sources, and voltage and current sources which are stabilized with respect to temperature.
REFERENCES:
patent: 3930172 (1975-12-01), Dobkin
patent: 4460865 (1984-07-01), Bynum et al.
patent: 4491780 (1985-01-01), Neidorff
patent: 4682098 (1987-07-01), Seevinck et al.
Peter H. Saul, "An 8-bit, 5 ns Monolithic D/A Converter Subsystem", IEEE Journal of Solid-State Circuits, vol. SC-15, No. 6, Dec. '80, pp. 1033-1039.
Briody T.
Meetin R.
North American Philips Corporation Signetics Division
Treacy D.
Wong Peter S.
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