Ttl-to-ecl input translator/driver circuit

Abstract From the Canadian patent

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 fol-, lower which acts as a level shifting comparator; a selfcentering 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-, …