Ttl-to-ecl input translator/driver circuit

Details Ttl-to-ecl input translator/driver circuit Ttl-to-ecl input translator/driver circuit

H - Electricity

03

K

328/125

H03K 19/00 (2006.01) H03K 19/003 (2006.01) H03K 19/018 (2006.01)

Patent

CA 1292783

TTL-TO-ECL INPUT TRANSLATOR/DRIVER CIRCUIT ABSTRACT OF THE INVENTION 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 addi- tional delay due to an input emitter follower stage. The circuit includes a clamped, switched emitter fol- lower 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 refer- ence will automatically shift by an appropriate per- centage to compensate for the original shift in the TTL reference. T7/10577-131

583472

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