ABSTRACT
ECL, which stands for emitter-coupled logic, is based on bipolar transistors and is currently the logic family with the highest speed and a high output power capability, although power consumption is also the highest. ECL is more complicated to fabricate, covers a larger chip area, and is more expensive than any other logic family. As the speed of CMOS improves, ECL is less often used but is still useful for the cases where high speed, along with large output power, are necessary, such as high-speed transmission over communication lines. ECL has three types of transistor circuits: standard ECL logic gates, their
modification with wired logic, and ECL series-gating.
