Low-Cost Emitter-Coupled Logic Pulse Driver
Original Publication Date: 1988-Jul-01
Included in the Prior Art Database: 2005-Feb-15
A triple-line emitter coupled logic (ECL) receiver is used as a high performance pulse driver to generate a fast transition pulse having precision up and down levels while driving into a 50-ohm load. A circuit, with three receivers, is used to generate precision tester pulses. Referring to the figure, the three receivers Z2, ZA, and ZB each have complementary outputs and when built on a single chip have very closely matched transistor characteristics. By using receiver ZA for DC steering, ZB will follow within + 5 mv. Voltage Vcc, generated by operational amplifier A4, controls output offset voltage on outputs of ECL receivers ZA and ZB to within + 5 mv. Voltage Vee, which is generated by operational amplifier A2, controls the gain of ZA and ZB within + 1%.