Current stabilizing circuit operable at low power supply voltage

Details Current stabilizing circuit operable at low power supply voltage Current stabilizing circuit operable at low power supply voltage

1984-06-29

1986-12-16

Shaw, Clifford C.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323312, G05F 156

Patent

active

046299734

ABSTRACT:
Arranged between a first and a second common terminal, the circuit includes a first circuit formed by the series arrangement of a first PNP-transistor and a second NPN-transistor, and a second circuit formed by the series arrangement of a third PNP-transistor, a fourth NPN-transistor and a first resistor. The commonly-connected bases of the second and fourth transistors are driven by a first differential amplifier, whose non-inverting input is coupled to the collector of the second transistor and whose inverting input is coupled to a tap of a voltage divider formed by a second and a third resistor. The commonly-connected bases of the first and third transistors are driven by a second differential amplifier, whose non-inverting input is coupled to the collector of the third transistor and inverting input to the tap of the voltage divider. Because of the drive by means of the first and second amplifiers, the collector-base voltages of the first and third transistors and of the second and fourth transistors vary to an equal extent in the event of supply voltage variations, as a consequence of which the symmetry of the circuit is preserved.

REFERENCES:
patent: 3914683 (1975-10-01), van der Plassche
patent: 4412186 (1983-10-01), Nagano

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