Patent ID: 6850091

Claim:
A bi-directional impedance matching apparatus, the bi-directional impedance matching apparatus couplable through an interface to a channel for signal transmission and reception, the channel having a channel impedance, the bi-directional impedance matching apparatus comprising: a first switchable impedance having an output impedance substantially matching the channel impedance; a second switchable impedance having an input impedance substantially matching the channel impedance; and an impedance controller coupled to the first switchable impedance and the second switchable impedance, the impedance controller having a plurality of operating modes, the impedance controller capable of selectively coupling the first switchable impedance to the interface in a transmit mode of the plurality of operating modes, the impedance controller further capable of selectively coupling the second switchable impedance to the interface in a receive mode of the plurality of operating modes, the impedance controller further capable of uncoupling the first switchable impedance and the second switchable impedance from a power supply potential and from a ground potential in a low power mode of the plurality of operating modes.