Fast PNP transistor turn-off circuit

Details Fast PNP transistor turn-off circuit Fast PNP transistor turn-off circuit

1987-08-31

1989-07-11

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307255, 307300, 307630, 323289, H03K 333, H03K 3013, H03K 458, H03K 1704

Patent

active

048475203

ABSTRACT:
A circuit is provided for reducing the turn-off transition time of a switching PNP transistor by providing a reverse drive current to the base of the PNP transistor after the drive current has been removed from the base. The reverse drive current is generated by an NPN transistor, the emitter of which is connected to the base of the PNP transistor. A capacitor coupled to the base of the NPN transistor is charged and during the conducting period of the PNP transistor and discharged after the drive current is removed from the base of the PNP transistor to enable the base of the NPN transistor to be driven above the supply voltage connected to the emitter of the PNP transistor.

REFERENCES:
patent: 3766414 (1973-10-01), Blackburn et al.
patent: 3784844 (1974-01-01), McGrogan, Jr.
patent: 3825774 (1974-07-01), Van Kessel et al.
patent: 4006370 (1977-02-01), Erler
"Inductor and Emitter Follower Remove Stored Charge to Turn Off 4 A in 20 ns", By Erick Burwen, from Electronic Design, 19, Sep. 13, 1979; p. 154.
"Turn Off Circuit", by D. E. Norton, from IBM Technical Disclosure Bulletin, vol. 7, No. 6, Nov. 1964; p. 428.

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