Patent ID: 6393069
Filing Date: 2002-05-21
Classification: H03K,H04L

Abstract:
A circuit for compensating for the degradation in pulse width of burst data having a header area with a predetermined mark-to-space ratio and a data area for storing data, comprising:an initial potential generating unit providing an initial potential when starting to detect a threshold in order to compensate for the degradation in a pulse width; a switch unit switching the initial potential to a burst data signal when the burst data signal is inputted; a low-pass filter unit possessing a similar cut-off frequency to a signal transmission speed for smoothing the waveform of an output from the switch unit; a limiting amplifier unit amplifying the output of said low-pass filter unit and inputting the output of said low-pass filter to a signal input terminal; a threshold generating unit starting a threshold detection for compensating the degradation in pulse width by switching the switch unit when the burst data signal is inputted, terminating the threshold detection before the detection of the header area of the burst data is completed, and storing the threshold until the burst data signal is completed, wherein the output of the threshold generating unit is connected to a reference potential terminal of said limiting amplifier unit, and the degradation in pulse width of the burst data signal is compensated for with the initial potential inputted to the reference potential terminal as the threshold.