Emitter-coupled logic output circuit

Details Emitter-coupled logic output circuit Emitter-coupled logic output circuit

1991-09-23

1992-06-23

Pascal, Robert J.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307455, 307475, H03K 1900

Patent

active

051245817

ABSTRACT:
An ECL output circuit comprises a current-switching type logic circuit formed by differentially connected first and second bipolar transistors whose common emitters are connected to a lower potential power supply, and an emitter follower circuit formed by a third bipolar transistor whose collector is connected to a higher potential power supply and whose base is connected to a collector of one of the first and second bipolar transistors. The ECL output circuit further comprises a first N-type MOS transistor having a source connected to the lower potential power supply, and a gate and a drain commonly connected to the higher potential power supply through a resistor and to a collector of the other one of the first and second bipolar transistors through a capacitor, and a second N-type MOS transistor having a gate connected to the gate of the first MOS transistor, a source connected to the lower potential power supply, and a drain connected to the emitter of the third bipolar transistor. The circuit enables the discharging current of an output load to be increased only in the falling period of the output thereby realizing the high-speed operation, and where no logical change occurs, a very small constant-current flows in the circuit resulting in low power consumption.

REFERENCES:
patent: 4835420 (1989-05-01), Rosky
patent: 5003199 (1991-03-01), Chuang et al.
patent: 5006731 (1991-04-01), Denda
patent: 5023479 (1991-06-01), Jeffery et al.
patent: 5047670 (1991-09-01), Tran
patent: 5059827 (1991-10-01), Phan et al.
patent: 5066876 (1991-11-01), Fukuda et al.

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