TTL-to-ECL input translator/driver circuit

Details TTL-to-ECL input translator/driver circuit TTL-to-ECL input translator/driver circuit

1987-11-20

1989-02-21

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307362, 307455, 307494, H03K 19092

Patent

active

048068004

ABSTRACT:
The present invention provides a high speed low power electrical circuit for converting true TTL level signals to true ECL level signals. The circuit only has a single buffer delay with some small additional delay due to an input emitter follower stage. The circuit includes a clamped, switched emitter follower which acts as a level shifting comparator; a self-centering reference threshold translator; a clamped level shifted input translator; and, an ECL Buffer Driver. The circuit also includes a TTL reference and an ECL reference which are tied together. If the TTL reference level shifts slightly due to temperature changes, supply voltage shifts or other factors, the ECL voltage reference will automatically shift by an appropriate percentage to compensate for the original shift in the TTL reference.

REFERENCES:
patent: 4533842 (1985-08-01), Yang et al.
patent: 4593211 (1986-06-01), Belforte
patent: 4642482 (1987-02-01), Kasperkovitz et al.
patent: 4698527 (1987-10-01), Matsumoto
patent: 4700087 (1987-10-01), Stroberger
patent: 4736125 (1988-04-01), Yuen
patent: 4739194 (1988-04-01), Glasby et al.

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