Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1998-10-14
2000-06-20
Wells, Kenneth B.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327540, 327541, 330282, 330284, H02J 338
Patent
active
060782102
ABSTRACT:
The present invention relates to an internal voltage generating circuit. The internal voltage generating circuit comprises a reference voltage generating circuit for generating a reference voltage, which does not depend on an external power supply; and a comparator including a first input terminal, to which the reference voltage is supplied, a second input terminal, for comparing the voltages of the first and second input terminals and generating an output voltage according to the difference thereof at the output terminal; and an impedance element, which is selectively inserted between the output terminal and the second input terminal of the comparator according to an operation mode. An internal power supply voltage, which has a constant voltage during normal operation and has an accurate higher voltage during acceleration test, can be generated at the output terminal by inserting or not inserting a suitable impedance element between the second input terminal and output terminal according to the operation mode. The above-described comparator can be realized by a common differential amplifying circuit, for example. Further, a reference voltage value at normal operation can be fine-tuned by subdividing the impedance element. In the same way, the voltage value at acceleration test can be also fine-tuned by subdividing the impedance element.
REFERENCES:
patent: 3742384 (1973-06-01), Breitzmann et al.
patent: 4479097 (1984-10-01), Larson et al.
patent: 5166550 (1992-11-01), Matsubara et al.
patent: 5703529 (1997-12-01), Ghaffaripour et al.
patent: 5856756 (1999-01-01), Sasahara et al.
Matsuzaki Yasurou
Uchida Toshiya
Fujitsu Limited
Luu An T.
Wells Kenneth B.
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