Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Patent
1998-05-27
2000-04-18
Zweizig, Jeffrey
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
H03L 700
Patent
active
06052006&
ABSTRACT:
The present disclosure encompasses the use of a current mirror to control the trip point for a power-on-reset circuit. The current mirror is designed to turn on at a multiple of a transistor threshold voltage V.sub.t. The power-on-reset circuit asserts a power-on signal in response to mirror current provided by the current mirror when the supply voltage ramps up above the V.sub.t multiple. Since the transistor threshold voltage may be tightly controlled during the fabrication process, the trip point for the power-on-reset circuit may be precisely and accurately adjusted to match the minimum operating supply voltage level specified for an integrated circuit device such as a microprocessor. Also, a feedback path may be provided in the power-on-reset circuit to turn off the current mirror once the power-on signal is asserted so that there is no current draw in the power-on-circuit for static conditions. The lack of current draw at static power conditions prevents unnecessary power consumption and false stuck-at faults during I.sub.ddq testing.
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patent: 5203867 (1993-04-01), Love et al.
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Horrowitz and Hill, "The Art of Electronics," Cambridge University Press, 1980, pp. 71-74 and 374.
Hershbarger Russell
Talaga, Jr. Ronald F.
Advanced Micro Devices , Inc.
Kowert Robert C.
Zweizig Jeffrey
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