Patent ID: 7538586
Filing Date: 2009-05-26
Classification: H03K,H04L

Abstract:
1. A transmitter for a controlled-shape switched signal on a communication line comprising signal generator means including capacitor means and signal producing means responsive to a capacitor voltage across said capacitor means for applying said switched signal to said line, and charging means responsive to an input signal for supplying a charging current to said capacitor means so as to define an edge of said switched signal, characterized in that said charging means comprises feedback loop means responsive to said capacitor voltage for generating a feedback current having a continuous magnitude that is a progressive function of said capacitor voltage, said charging current being a function of said feedback current so that the rate of change of said capacitor voltage is a continuous function of time, said feedback loop means comprises first and second feedback loop elements for generating first and second feedback voltages whose magnitudes are respective functions of said capacitor voltage and selection means for generating said feedback current first as a function of a selected one of said first and second feedback voltages and subsequently as a function of the other of said feedback voltages.