Temperature insensitive CMOS precision current source

Details Temperature insensitive CMOS precision current source Temperature insensitive CMOS precision current source

1984-09-26

1986-06-17

Beha, Jr., William H.

Electricity: power supply or regulation systems

Self-regulating

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

323313, 323907, G05F 316

Patent

active

045958742

ABSTRACT:
A CMOS precision current source which is insensitive to changes in both ambient temperature and processing conditions. In particular, a CMOS circuit exhibits both a temperature dependent voltage (V(T)) and a temperature dependent on-chip resistance (R(T)) where the dependencies of both voltage and resistance are linear functions of temperature of the form y=mx+b. The ratio of the slopes (m.sub.V /m.sub.R) is constructed to be equal to the ratio of the y-intercepts (b.sub.v /b.sub.R), where this ratio is a constant value, denoted s. Therefore, since a constant output current I.sub.o is equal to V(T)/R(T), I.sub.o will be equal to the constant value s. Additionally, a constant reference voltage (V.sub.o) may also be provided with a minimal increase in the circuitry needed to provide the constant current.

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"A Highly Stable Current . . . ", Journal of Physics E: Scientific Instruments, May 1972, L. E. MacHattie, pp. 1016-1017.

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