Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1994-05-12
1995-09-26
Stephan, Steven L.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
323315, G05F 316
Patent
active
054536790
ABSTRACT:
A bandgap constant voltage circuit employs a resistor network to pass the currents conducted by a pair of PN junction transistors. These two transistors are operated at differential current densities. A resistor is connected in series with the lower current density transistor. A comparator has its input terminals coupled to the circuit nodes representing the higher current density transistor and the combined lower current density transistor and series-connected resistor. The comparator output is a current that is coupled to the resistor network which is proportioned with respect to the series-connected resistor to produce a voltage that, when combined with the voltage drop across the high current density transistor, is equal to the semiconductor bandgap. A negative feedback loop, employing re-entrant connected current mirrors, is employed to adjust all of the circuit currents and is incorporated into the comparator so that the voltage applied to the resistor network is maintained at the bandgap value. The circuit described also produces P-channel and N-channel transistor reference voltages. A start-up circuit ensures that, when power is applied, the circuit will be forced to conduct its designed currents. If desired, the start-up circuit can be disabled by a control potential.
REFERENCES:
patent: 4287439 (1981-09-01), Leuschner
patent: 4816742 (1989-03-01), van de Plassche
patent: 4935690 (1990-06-01), Yan
patent: 5063342 (1991-11-01), Hughes et al.
patent: 5229710 (1993-06-01), Kraus et al.
patent: 5291122 (1994-03-01), Audy
National Semiconductor Corporation
Nelson H. Donald
Nguyen Matthew V.
Pitruzzella Vincenzo D.
Stephan Steven L.
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