Antisaturation circuit for integrated PNP transistor with interv

Details Antisaturation circuit for integrated PNP transistor with interv Antisaturation circuit for integrated PNP transistor with interv

1986-06-26

1988-11-22

Miller, S. D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307297, 307270, 323289, H03K 333, H03K 301, G05F 140

Patent

active

047868279

ABSTRACT:
Described is an antisaturation circuit for an integrated PNP transistor characterized by a comparator circuit comprising two transistors and a current generator whose output current corresponds to a pre-established function, e.g., an exponential function, of the emitter current of said transistor. The changing of state of the comparator circuit, as determined by said pre-established function of said current generator, is determined by the drop of the V.sub.CE voltage of the transistor below a preset minimum value, with a portion of the conduction current of one of the two transistors of the comparator circuit utilized for increasing the forced .beta. of the transistor. This limits the degree of its saturation, as well as the leakage current toward the substrate.

REFERENCES:
patent: 3697860 (1972-10-01), Baker
patent: 4064448 (1977-12-01), Eatock
patent: 4479052 (1984-10-01), Suzki

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