Disclosed is an output buffer which utilizes CMOS components to convert from CMOS to ECL voltages. The circuit includes a field effect transistor and an external resistor for providing both high and low voltages by applying to the gate of the field effect transistor appropriate control voltages....http://www.google.de/patents/US5043605?utm_source=gb-gplus-sharePatent US5043605 - CMOS to ECL output buffer
