Transmitter with active differential termination

A method of high speed data transmission, comprising the steps of:

• (a) providing a plurality of drivers each having series terminating resistor, wherein the resistors are connected at a common point;
• (b) providing a data signal;
• (c) providing a control signal for operating the drivers in two modes, wherein:
• (d) in the first mode, a control unit supplies drivers with a signal which is a function of input data, to provide the plurality of drivers drives a communication line with an output impedance equal to the parallel effect of all the terminating resistors;
• (e) in the second mode, the control unit generates a signal to make the plurality of drivers with respective series terminating resistors acting as a parallel termination circuit, while no actual data is transmitted in this mode;
• (f) repeating steps (d) and (e).

A transceiver comprising:

• a transmitting circuit comprising a plurality of drivers each having series terminating resistor;
• wherein the series terminating resistors for all drivers are joined in a common point;
• a receiving circuit comprising at least one receiver;
• and
• a control unit provided by a data signal and a control signal, the control unit capable of driving the plurality of drivers in two modes, wherein
• in the first mode, the control unit supplies drivers with a signal which is a function of input data, to provide the transmitter drives a communication line with an output impedance equal to the parallel effect of all the terminating resistors;
• in the second mode, the control unit generates a signal to make the plurality of drivers with respective series terminating resistors acting as a parallel termination circuit, while no actual data is transmitted in this mode.