Active termination network for clamping a line signal

Details Active termination network for clamping a line signal Active termination network for clamping a line signal

1974-04-05

1976-02-10

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307297, 307299A, 307313, H03K 508

Patent

active

039379884

ABSTRACT:
An active termination network for clamping a line signal near the receiving end of a data path. The termination network comprises an NPN transistor, a PNP transistor, the emitter electrodes of the transistors being coupled together to form an input terminal which is connected to the data path, a first bias source for biasing the base of the NPN transistor such that the NPN transistor is caused to turn on when the line signal is below a low state, a second bias source for biasing the PNP transistor such that the PNP transistor is caused to turn on when the line signal is above a high state, a third bias source biasing the collector of the NPN transistor at ground, and a fourth bias source for biasing the collector of the PNP transistor with a negative voltage such that when the line signal fluctuates, the PNP and NPN transistors selectively turn on so as to appropriately clamp the line signal at the high and the low states so as to dissipate ringing energy and thus prevent the detrimental undershoot toward the threshold level. This network lends itself for usage in ECL circuits in which the logic states have a peak-to-peak amplitude of about one volt. In the preferred embodiment the first and second bias sources are developed from a temperature and voltage compensating network connected between the third and fourth bias sources.

REFERENCES:
patent: 2980806 (1961-04-01), Ort
patent: 3246080 (1966-04-01), Ritchey, Jr.
patent: 3466463 (1969-09-01), Moses

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