ECL circuit with feedback circuitry for increased speed

Details ECL circuit with feedback circuitry for increased speed ECL circuit with feedback circuitry for increased speed

1992-05-11

1993-08-03

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307455, H03K 19013, H03K 19086

Patent

active

052332390

ABSTRACT:
An ECL output circuit comprises a current switching circuit of the differential circuit type including a first transistor having a base connected to receive an input voltage and a second transistor having a base connected to a first reference voltage. A third transistor of an emitter follower has a base connected to a collector of the second transistor and an emitter connected to an output terminal. There is also provided an output level detection and feedback circuit including a differential circuit composed of fourth and fifth transistors having their emitters connected in common to a constant current. The fourth transistor has a base connected to the output terminal and a collector connected to the common-connected emitters of the first and second transistors. The fifth transistor has a base connected to a second reference voltage which determines a low level voltage of an output voltage. A sixth transistor is connected in parallel to the fifth transistor and has a base connected to receive the input voltage. Thus, it becomes unnecessary to lower the low level voltage of the output voltage, and the operating margin is not reduced. In addition, a high switching speed can be obtained.

REFERENCES:
patent: 4329597 (1982-05-01), Yamagiwa
patent: 4532440 (1985-07-01), Barre
patent: 4818896 (1989-04-01), Cavanna

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