CMOS voltage reference

Details CMOS voltage reference CMOS voltage reference

1990-09-28

1992-04-28

Stephan, Steven L.

Electricity: power supply or regulation systems

Self-regulating

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

323315, 3072961, 3072966, 3072968, 36518909, 365226, G05F 324, G05F 326

Patent

active

051091879

ABSTRACT:
A circuit is described as a generating supply-independent voltage reference. In MOS technology, a current mirror section incorporating a pair of N-channel and W-channel tracking devices are coupled to a power supply V.sub.cc for generating a voltage reference output that is directly proportional to V.sub.tn -V.sub.tw. V.sub.tn is the gate threshold voltage of the N-channel device, while V.sub.tw is the gate threshold voltage of W-channel device. A start-up circuit is further coupled to the power supply V.sub.cc and to the current mirror section for maintaining the operating point V.sub.1 of the circuit that is independent of supply voltage. The degree of supply independence can be further increased by adding a pair of P-channel device to the output of the present invention. Thus, the present invention generates a voltage reference that is independent from power supply, temperature and process while minimizing power dissipation. When the present invention replaces the power supply to the sensing circuit of non-volatile memory devices such as an EPROM the overshoot encountered during the read mode is minimized. It follows that the present invention not only solves one of the key yield losses seen on non-volatile memory devices but also improves the access time for the same devices.

REFERENCES:
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patent: 4203158 (1980-05-01), Frohman-Bentchkowsky et al.
patent: 4742292 (1988-05-01), Hoffman
patent: 4837459 (1989-06-01), Bukowski et al.
P. R. Gray and R. G. Meyer, Analysis and Design of Analog Integrated Circuits, Chapter 12.3, pp. 730-737, (Wiley, Second Edition) (1984).

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