Patent ID: 6574576
Filing Date: 2003-06-03
Classification: H04B

Abstract:
A transmission line length estimation circuit with continuous feedback equalizer, said transmission line length estimation circuit comprising:a direct-current (DC) bias circuit and a peak detector circuit for generating a direct-current voltage according to a cable length, said peak detector circuit used for a first signal in first time and a second signal in second time; an equalizer core circuit for receiving said first signal and generating said second signal; a transmission line length detector circuit coupled to said peak detector circuit, said transmission line length detector circuit for generating a plurality of first parameters for phase shift and amplitude losses according to said cable length; an internal pattern calibration circuit multiplexed to said first signal, said internal pattern calibration circuit for generating a plurality of second parameters for calibration of close loop; and a feedback control circuit connected to said equalizer core circuit, said feedback control circuit for continuously fine tuning of said equalizer core circuit according to said first parameters and said second parameters.