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1. A receiver circuit configured to operate in a DisplayPort (DP) mode and a High-Definition Multimedia Interface (HDMI) mode, comprising:
termination circuitry configured to receive a DP signal in the DP mode and an HDMI signal in the HDMI mode, wherein the termination circuitry comprises:
a plurality of pads for receiving the DP signal in the DP mode and the HDMI signal in the HDMI mode;a plurality of termination resistors connected to the plurality of pads;a DC termination voltage;a target common-mode voltage; anda first switch configured to:
connect the plurality of termination resistors to the DC termination voltage in the HDMI mode; andconnect the plurality of termination resistors to the target common-mode voltage in the DP mode; and voltage common-mode (VCM) level shifter circuitry configured to operate as a pass-through for the DP signal in the DP mode and generate a converted HDMI signal from the HDMI signal in the HDMI mode, wherein the VCM level shifter circuitry comprises:
a plurality of extraction resistors configured to extract an actual common-mode voltage from the converted HDMI signal;a comparator configured to generate a control signal based on a difference between the target common-mode voltage and the actual common-mode voltage;a plurality of transistors configured to reduce the actual common-mode voltage in the converted HDMI signal based on the control signal; anda second plurality of switches configured to:
connect, during the HDMI mode, the plurality of transistors to an output of the VCM level shifter circuitry; anddisconnect, during the DP mode, the plurality of transistor from the output. |
