Adjustable substrate voltage applying circuit of a semiconductor

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage

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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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patent: 6011743 (2000-01-01), Khang
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.

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