Techniques for switching between AC-coupled connectivity and DC-coupled connectivity

摘要

A circuit for switching between an AC-coupled connectivity and DC-coupled connectivity of a multimedia interface. The circuit comprises a current source connected in series to a wire of the multimedia interface and a coupling capacitor; and a termination resistor connected to the current source and to the coupling capacitor, wherein the circuit is connected in series between a source line driver and a sink line receiver of the multimedia interface, wherein the source line driver supports both the AC-coupled connectivity and the DC-coupled connectivity and the sink line receiver supports any one of the AC-coupled connectivity and the DC-coupled connectivity, wherein the current source and the termination resistor allows the setting of voltage levels of signals received at the sink line receiver to voltage levels defined by the multimedia interface thereby to switch to the coupling connectivity type required by the multimedia interface at which the sink line receiver operates.

主权项

1. A circuit for switching between an AC-coupled connectivity and a DC-coupled connectivity of a multimedia interface, comprising:
a first current source connected in series to a first wire of the multimedia interface and a first tap of a first coupling capacitor; a first termination resistor connected to the first current source and to the first tap of the first coupling capacitor, wherein the circuit is connected between a source line driver and a sink line receiver of the multimedia interface, the sink line receiver supporting either the AC-coupled connectivity or the DC-coupled connectivity; and a controller configured to set the first current source to an off-state to support the AC-coupled connectivity to the sink line receiver and to set the first current source to an on-state to support the DC-coupled connectivity to the sink line receiver, in the sink line receiver being connected to the first tap of the first coupling capacitor and the source line driver being connected to a second tap of the first coupling capacitor.