| 摘要 |
<p>An improved variable voltage transition circuit of the type that switches a capacitor (C) between charging and discharging current sources (I1, I2) when an input voltage (Vin) transitions, the capacitor being coupled via respective Schottky diodes (D5, D6) to tracking clamp circuits (16, 18), has a compensation circuit (20, 22) that includes second current sources (I3, I4) that match the charging and discharging current sources and uses regenerative feedback to turn on and off the Schottky diodes virtually instantaneously when the input voltage transitions. A fixed clamp circuit (24, 26) and a bias switch circuit (28, 30) are coupled between the clamp circuits and one side of the transition switch to provide a conductive path for the second current sources that results in a change in the bias of the tracking clamp circuits such that when the input voltage transitions the "on" Schottky diode is instantaneously turned off, and the "off" Schottky diode is turned completely on very quickly after it starts to conduct at the end of the transition. <IMAGE></p> |
