Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1990-10-26
1991-09-24
Wong, Peter S.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
323314, 3072966, G05F 322
Patent
active
050516868
ABSTRACT:
A bandgap voltage reference of a unique design is disclosed. The reference utilizes a pair of transistors operating at different current densities to provide a current component through a resistor at the .DELTA.V.sub.BE of the two transistors. A second current component through the resistor is provided through another resistor connected to the common emitter connection of another pair of transistors, the collectors of the last named pair of transistors each being connected to one input of a operational amplifier, the output of which is the output of the circuit. In operation, the base of one of the last named pair of transistors is connected to a resistor divider on the circuit output and held at the bandgap voltage, the base of the other of the last named pair of transistors also being held at the bandgap voltage by being connected to a resistor divider between the collector of one of the two transistors operating at different current densities and the emitter of a fifth transistor, the base of the fifth transistor being connected to the resistor divider on the circuit output at a point corresponding to a voltage of two bandgap voltages. By proper selection of transistor size ratios and resistor ratios, a high degree of symmetry can be achieved.
REFERENCES:
patent: 3887863 (1975-06-01), Brokaw
patent: 4249122 (1981-02-01), Widlar
patent: 4250445 (1981-02-01), Brokaw
patent: 4348633 (1982-09-01), Davis
patent: 4447784 (1984-05-01), Dobkin
patent: 4795961 (1989-01-01), Neidorff
patent: 4902959 (1990-02-01), Brokaw
Maxim Integrated Products
Wong Peter S.
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