Ropes & Gray LLP
Versatile common-mode driver methods and apparatus
Methods and apparatus are provided for selectively setting a CM voltage for a transceiver, reducing the effect of current mismatch, and generating a voltage step that can be used for receiver detection. A circuit of the invention can include voltage generator circuitry operable to generate a plurality of voltage signals of substantially different voltages. The circuit can also include multiplexer circuitry with voltage inputs coupled to the voltage signals. The multiplexer circuitry can be operable to select a reference signal from among the voltage inputs. In addition, the circuit can include operational amplifier (“op-amp”) circuitry with a first input coupled to the reference signal and a second input coupled to an output signal of the op-amp circuitry.
Altera Corporation
H H
H04L H03K
inventional inventional
Simardeep Thungoc M. Mei Sergey
Maangat Tran Luo Shumarayev