PRE-CLOCK/DATA RECOVERY MULTIPLEXING OF INPUT SIGNALS IN A HDMI VIDEO RECEIVER

摘要

High Definition Multimedia Interface (HDMI) receivers use digital multiplexer at the input stage after equalization, clock and data recovery for each channel of each port. Described herein, ref : fig. 2, is the use of an analog multiplexer 210 for HDMI receiver. The purpose of the analog multiplexer 210 is to reduce the die size and power consumption by selecting the input signal from one port out of a set of input ports, 110, 120, 130, right after the equalization 150 and hence use only one block of clock and data recovery (CDR) circuits 160 for the receiver. This sharing of one block of CDR circuits 160 between all input ports requires the use of analog multiplexer circuits 210, as the signals presented to the analog multiplexer 210 after equalization 150 are of low signal strength and have insufficient signal-to-noise ratio to allow handling by digital multiplexer circuitry.