Substrate generator

Details Substrate generator Substrate generator

1978-10-24

1980-06-17

Anagnos, Larry N.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307200B, 307304, 307DIG1, 307DIG4, H03K 102

Patent

active

042085950

ABSTRACT:
An FET substrate voltage generator circuit is disclosed for converting a single power supply and ground potential to a negative potential having an absolute value whose magnitude is greater than the power supply potential and applying that potential to the substrate of an integrated circuit upon which it is formed. The circuit dissipates less power per unit of current supplied by the circuit and occupies less space than do prior art circuits. The circuit applies the principle of voltage doubling to a first capacitor to achieve the desired voltage magnitude across a second capacitor and then applies the principle of a.c. coupling to that second capacitor connected through an impedance to the first capacitor, to achieve the desired polarity inversion for the substrate voltage to be generated. This circuit provides the current generating capacity necessary to drive the substrate to a negative voltage and sink the required current so as to maintain the substrate at an adequate negative bias.

REFERENCES:
patent: T954006 (1977-01-01), Lee et al.
patent: 3609414 (1971-09-01), Pleshko
patent: 3790812 (1974-02-01), Fry
patent: 3794862 (1974-02-01), Jenne
patent: 3806741 (1974-04-01), Smith
patent: 3956714 (1976-05-01), Luscher
patent: 4016476 (1977-04-01), Morokawa et al.
patent: 4049980 (1977-09-01), Maitland
patent: 4115710 (1978-09-01), Lou
patent: 4123671 (1978-10-01), Aihara et al.
patent: 4142114 (1979-02-01), Green
Jensen, "Substrate Voltage Generator Circuit," IBM Tech. Discl. Bull., vol. 21, No. 2, pp. 727-728, Jul. 1978.
Kubo et al., 1976 IEEE Int'l Solid-State Circuits Conference, (Digest of Technical Papers); "Session VI, MOS Techniques," pp. 54-55, Feb. 18, 1976.
Hummel, "Sentry Circuit for Substrate Voltage Control," IBM Tech. Discl. Bull., vol. 15, No. 2, pp. 478-479, Jul. 1972.
Electronics, (pub.), "Fast MOSTEK ROM has 350-ns Access," pp. 42-43, Sep. 16, 1976.

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