Antisaturation circuit

Details Antisaturation circuit Antisaturation circuit

1990-03-21

1991-07-30

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307254, H03K 1760

Patent

active

050362186

ABSTRACT:
An antisaturation circuit comprising a differential input pair monitors the collector-base voltage of a protected transistor to detect the condition prior to the protected transistor going into saturation mode. To prevent the protected transistor from operating in the saturation mode, the differential input pair sinks a portion of the protected transistor's collector current. This reduction in collector current causes an increase in the collector voltage thus keeping the collector-base junction reverse biased and the protected transistor out of the saturation mode. This antisaturation technique does not steal base current from the protected transistor, hence leaving its input impedance unaffected. This antisaturation technique is thus useful in higher performance non-linear circuits as well as in linear circuits.

REFERENCES:
patent: 4021687 (1977-05-01), Yoshimura
patent: 4338646 (1982-07-01), Davis et al.
patent: 4675548 (1987-06-01), Eshbaugh
patent: 4701638 (1987-10-01), Marchio et al.
patent: 4710793 (1987-12-01), Gray
patent: 4755741 (1988-07-01), Nelson
patent: 4764686 (1988-08-01), Rischmuller
patent: 4914320 (1990-04-01), Zhang
patent: 4980578 (1990-12-01), Shaffer et al.
patent: 4988899 (1991-01-01), Jansson

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