Emitter-coupled logic
(重定向自Current steering logic)
![Motorola ECL 10,000 basic gate circuit diagram[1]](/uploads/202501/07/ECL.svg4929.png)
![Yourke's current switch, c. 1955.[9]](/uploads/202501/07/CurrentSwitchLogic.svg4929.png)

In electronics, emitter-coupled logic (ECL) is a high-speed integrated circuit bipolar transistor logic family. ECL uses an overdriven BJT differential amplifier with single-ended input and limited emitter current to avoid the saturated (fully on) region of operation and its slow turn-off behavior. As the current is steered between two legs of an emitter-coupled pair, ECL is sometimes called current-steering logic (CSL), current-mode logic (CML) or current-switch emitter-follower (CSEF) logic.