Emitter-coupled logic
(重定向自Emitter Coupled Logic)
![Motorola ECL 10,000 basic gate circuit diagram[1]](/uploads/202501/11/ECL.svg1447.png)
![Yourke's current switch, c. 1955.[9]](/uploads/202501/11/CurrentSwitchLogic.svg1447.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.