OUTPUT BUFFER HAVING PREDRIVER FOR COMPENSATING SLEW RATE AGAINST PROCESS VARIATION

摘要

<P>PROBLEM TO BE SOLVED: To provide an output buffer incorporating a compensation circuit and a predriver and having a slew rate which is compensated against process variations. Ž<P>SOLUTION: A compensation circuit 370 includes an operational amplifier 250, a second NFET 240, a third NFET 371 having a gate connected to an output of the amplifier, and an execution resistance 381. In an output buffer 300, the core 150 of an IC chip asserts a control signal to a predriver 310. In response thereto, the predriver 310 asserts the control signal buffered in a first NFET 320, turns on the first NFET 320, and asserts an output signal of a VSS level to a pad 230. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž