Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1982-08-30
1984-07-17
Beha, Jr., William H.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
307475, 323907, G05F 308
Patent
active
044608659
ABSTRACT:
A variable temperature coefficient level shifter includes a circuit which generates a voltage V.sub.BE having a negative temperature coefficient and a voltage .DELTA.V.sub.BE having a positive temperature coefficient. A control current is generated by placing a first resistor between V.sub.BE and ground and a second resistor between .DELTA.V.sub.BE and ground. Each of these currents forms a component of the control current which then has some net temperature coefficient. By properly scaling the resistors the control current may have any desired temperature coefficient between 2800 ppm and 3000 ppm. Once the temperature coefficient is set, a third resistor is provided through which the control current flows. The amplitude of the shift is then selected by selecting the value of resistor R.sub.S.
REFERENCES:
patent: Re30586 (1981-04-01), Brokaw
patent: 3781648 (1973-12-01), Owens
patent: 4079308 (1978-03-01), Brown
patent: 4287439 (1981-09-01), Leuschner
patent: 4325017 (1982-04-01), Schade
patent: 4325018 (1982-04-01), Schade
Bynum Byron G.
Gray Randall C.
Jarrett Robert B.
Beha Jr. William H.
Ingrassia Vincent B.
Motorola Inc.
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