Serializer (MUX)

The serializer, also known as a multiplexer (MUX), is a critical digital circuit component within transmitters that aggregates multiple parallel input signals into a single high-speed serial output stream. It operates by sequentially sampling each parallel input channel and transmitting the data over a single transmission line, enabling efficient bandwidth utilization and reduced interconnect complexity in communication systems.

The serializer operates on time-division multiplexing principles, where parallel data inputs are sampled at a controlled clock rate. An internal shift register sequentially loads parallel data bits, then shifts them out serially at a higher frequency synchronized to the transmission clock. Clock data recovery circuits ensure proper synchronization between parallel-to-serial conversion and transmission timing.