US Patent 7212044 Network transmitting unit with correction function

A signal transmitting apparatus being used in a network device includes a voltage-controlled current source for outputting a current signal according to an input digital signal; a line driver for outputting a voltage signal according to the current signal; at least one impedance-matching unit, which is coupled to the line driver, for impedance-matching at the output of the line driver; and a first correction unit, which is coupled to the voltage-controlled current source, for outputting a first correction signal to adjust the current signal outputted from the voltage-controlled current source.