Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1995-10-27
1998-02-03
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327540, G05F 110, G05F 302
Patent
active
057149054
ABSTRACT:
A method, and associated circuit, which can prevent the latch-down phenomenon in transistors which are protected from going out of their SOAs.
By supplementing the first protection circuit (against moving out of the SOA) with a second protection circuit which can drive the control terminal of the transistor such that when, upon the voltage across the main conduction path of the transistor being increased, the value of the current flowing through said path would tend, due to the first protection, to drop below a predetermined lower limit, that value can be kept approximately constant and unaffected by the load as seen from the output terminal of the transistor; the transistor will at all events supply the load with some current up to the acceptable limit VMAX by the transistor.
REFERENCES:
patent: 3536958 (1970-10-01), Sondermeyer
patent: 4021701 (1977-05-01), Davies
patent: 4355341 (1982-10-01), Kaplan
patent: 4495537 (1985-01-01), Laude
patent: 5047988 (1991-09-01), Mizuta
patent: 5130883 (1992-07-01), Edwards
patent: 5357089 (1994-10-01), Prentice
patent: 5382839 (1995-01-01), Shinohara
patent: 5550462 (1996-08-01), Nakajima
Galli Giovanni
Scilla Giuseppe
Callahan Timothy P.
Carlson David V.
Consorzio per la Ricerca sulla Microelettronica nel Mezzogiorno
Nu Ton My-Trang
Stewart John C.
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