Patent ID: 6825686
Filing Date: 2004-11-30
Classification: H03F,H04L

Abstract:
A line driver for use with a power dissipating load, the line driver comprising:a hybrid circuit, a signal portion for connection to the load; and a termination portion connected to an output of the hybrid circuit for load matching, the termination portion comprises: a power dissipating termination impedance which is supplied in use by the hybrid circuit with a termination current, a back termination transformer, a first winding of the transformer being coupled in series with said termination impedance, and a second winding of the transformer being coupled in parallel with said termination impedance, wherein a portion of a voltage dropped across the termination portion is dropped across the first winding to thereby cause the power dissipated in said termination impedance to be less than the power available to the signal transmission portion for signal transmission to the load.