Output driver circuit for LSI and VLSI ECL chips with an active

Details Output driver circuit for LSI and VLSI ECL chips with an active Output driver circuit for LSI and VLSI ECL chips with an active

1984-08-31

1987-07-14

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307310, 307455, 3072471, H03K 19013, H03K 19003, H03K 19086, H03K 1704

Patent

active

046804803

ABSTRACT:
An output drive circuit for LSI and VLSI ECL chips is presented. The drive circuit converts the logic levels of the ECL chip to those required by an external circuit being driven. The driver circuit includes a differential amplifier (21) having a selectable switching threshold level. One output signal line from the differential amplifier is coupled to an emitter follower output transistor (Q10) having a resistor (R17) placed in series with an output node (26). An active pulldown transistor (Q11) is connected between the output node and a negative voltage reference level. The base terminal of the pulldown transistor is driven from a current source. A capacitor (C1) is connected between the base of the pulldown transistor and the other output signal line of the differential amplifier. A temperature compensation circuit (23) causes the output signal levels appearing on the output node to track the variations in signal levels of the external circuit caused by temperature changes.

REFERENCES:
patent: 3660676 (1972-05-01), Fleischhammer et al.
patent: 3766406 (1973-10-01), Bryant et al.
patent: 4347446 (1982-08-01), Price
patent: 4456838 (1984-06-01), Taguchi et al.
patent: 4476403 (1984-10-01), Allen
patent: 4490630 (1984-12-01), Freeman
patent: 4533838 (1985-08-01), Fujita
patent: 4551642 (1985-11-01), Aizawa et al.
patent: 4565976 (1986-01-01), Campbell

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