Bipolar logic circuit

Details Bipolar logic circuit Bipolar logic circuit

1987-08-04

1989-06-20

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307443, 307458, 307557, 307561, 307573, H03K 19088, H03K 508, H03K 17687

Patent

active

048411736

ABSTRACT:
In a bipolar logic circuit, an ouptut Darlington transistor and a first transistor are connected in series between a high potential source and a low potential source. A second transistor has a collector connected to a base of the output Darlington transistor and to the high potential source through a resistor, an emitter connected to a base of the first transistor, and a base connected to the high potential source through a resistor. A third transistor has an emitter connected to the low potential source and a base supplied with a signal corresponding to an input signal. A first diode has an anode connected to the base of the second transistor and a cathode connected to a collector of the third transistor. The bipolar logic circuit comprises a second diode whose anode is connected to the emitter of the second transistor and whose cathode is connected to the collector of the third transistor to provide a discharge path for base charges of the first transistor and to lessen transient current of the first transistor. The discharge path improves the high speed performance of the bipolar logic circuit and reduces transient current.

REFERENCES:
Mitsubishi LSTTLs M74LS245P.

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