Temperature compensated voltage reference for low and wide volta

Details Temperature compensated voltage reference for low and wide volta Temperature compensated voltage reference for low and wide volta

1992-09-03

1994-05-24

Sterrett, J. L.

Electricity: power supply or regulation systems

Self-regulating

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

323907, G05F 316

Patent

active

053152301

ABSTRACT:
A reference voltage generator which compensates for temperature and V.sub.CC variations includes a constant current source and a MOS P-channel transistor. The constant current source provides a constant current over a wide range of V.sub.CC that corresponds to biasing a p-channel transistor in a region where its resistance is constant. The output of the current source is supplied to the P-channel transistor, which is in saturation. The constant current provides a constant voltage drop across the P-channel transistor. Hence, a stable reference voltage is generated. Temperature compensation is provided by biasing the P-channel transistor to saturation and supplying a constant current that the corresponds to biasing a p-channel transistor where the resistance is substantially constant over a temperature range. The current causes a voltage drop across the P-channel transistor to maintain a stable reference voltage. Also, temperature compensation is further provided by utilizing the negative temperature coefficients of the resistors included in the constant current source.

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Michejda et al., "A Precision CMOS Bandgap Reference," IEEE Journal of Solid-State Circuits, vol. sc-19, No. 6, pp. 1014-1021 (Dec. 1984).

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