Reference voltage generator device

Details Reference voltage generator device Reference voltage generator device

H - Electricity

01

L

324/59

H01L 27/02 (2006.01)

Patent

CA 1143010

REFERENCE VOLTAGE GENERATOR DEVICE Abstract of the Disclosure The specification discloses a reference voltage generator device which detects a voltage corresponding to an energy gap of a semiconductor, or a voltage of a value close thereto, or a voltage based on an energy level of a semi-conductor, and generates the detected voltage as a reference voltage. The reference voltage is generated by detecting the difference of threshold voltages of first and second insulated gate field-effect transistors (IGFETs). Gate electrodes of the first and second IGFETs are formed on gate insulating films which are formed on different surface areas of an identical semiconductor substrate under substantially the same conditions. The gate electrodes of the first and second IGFETs are respec- tively made of two semiconductors which are selected from among a semiconductor of a first conductivity type, a semiconductor of a second conductivity type and an intrinsic semiconductor made of an identical semi- conductor material, and which have Fermi energy levels of values different from each other. The channels of the first and second IGFETs have an identical conductivity type. On the basis of a self-alignment structure, at least those parts of first and second polycrystalline semiconductor regions being the gate electrodes of the first and second IGFETs which are proximiate to source and drain regions are doped with the same impurity as that of the source and drain regions, and a central part of one of the first and second polycrystalline semiconductor regions is doped with an impurity of a selected one of the first conductivity type and the second conductivity type. The reference voltage is applicable to a differential - 1 - amplifier circuit and operational amplifier of the offset type, a voltage comparator, a constant-current circuit, a voltage regulator, a Schmitt trigger circuit, an oscillation circuit, a battery checker, and so on. In particular, the reference voltage generator device is relatively insensitive to changes of temperature. - 2 -

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