Patent ID: 6160851
Filing Date: 2000-12-12
Classification: H04L

Abstract:
An apparatus including a calibration circuit for calibrating an output signal from a line driver, the calibration circuit comprising:a sample and hold circuit configured to sample an output signal from a line driver circuit and hold a signal representative of the output signal;a comparator circuit coupled to the sample and hold circuit and configured to compare the held signal from the sample and hold circuit with a reference signal and generate a comparator signal indicating when the held signal transcends the reference signal;a control circuit coupled to comparator circuit and configured to receive the comparator signal and in accordance therewith generate a control signal; anda current source circuit coupled to the control circuit and configured to receive the control signal and in accordance therewith generate a calibration signal for combining with an input signal to the line driver circuit to calibrate the line driver circuit output signal with respect to the reference signal.