Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1998-11-18
2000-11-21
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327543, 36518909, G05F 110
Patent
active
061508705
ABSTRACT:
A substrate voltage applying circuit selectively controls a level of a substrate voltage supplied to a memory cell unit of a semiconductor device, for example, after fabrication. In a semiconductor device preferably fabricated by a triple-well process, a substrate voltage applying circuit of the semiconductor device can include an oscillation circuit unit that generates an oscillation signal and a pumping unit that outputs a substrate voltage based on the oscillation signal. A vendor test mode generating unit outputs sense level selecting signals by coding preferably signals that are externally supplied. A level sense unit senses a level of the substrate voltage using a plurality of preset sensing points and supplies a corresponding sensing signal to the oscillation circuit unit based on the sense level selecting signals from the vendor test mode generating unit.
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Syuso Fujii, et al., "FAM 16.6: A 45ns 16Mb DRAM with Triple-Well Structure," Session 16; IEEE International Solid-State Circuits Conference, pp. 248-249, Feb. 1989.
Callahan Timothy P.
Englund Terry L.
Hyundai Electronics Industries Co,. Ltd.
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