Patent ID: 6704365
Filing Date: 2004-03-09
Classification: H03F,H04L

Abstract:
A data transmission system including:a pair of electrical transmission lines; a current source connected to each of said lines; a transmission regulator which is arranged to receive data as two opposite input signals, and to transmit the data along the transmission lines as a difference between the currents at a first end of the lines; and measurement means for the difference between the currents at a second end of the lines, and from the difference extracting the data; wherein the transmission regulator is arranged to divide each input signal into two components, and for each input signal: to modify the current in a respective first on of the transmission lines using a first component of that input signal, and to apply a low-pass filter to the other component of that input signal, and using the output of the low-pass filter to modify the current in the respective other one of the transmission lines; whereby the difference between the currents in the two lines is greater for higher frequency components than for low frequency components.