公开(公告)号：US20030080781A1

公开(公告)日：2003-05-01

申请号：US10282487

申请日：2002-10-28

Applicant: STMICROELECTRONICS S.r.I.

Inventor： Giacomo Curatolo ,  Ignazio Martines ,  Davide Torrisi

IPC: H03K019/094

CPC classification number: H03K19/00361 ,  H03K17/167

Abstract: An output buffer for causing a voltage (Vout) of an integrated circuit output line (OUT,OUT13 PAD) to switch from a voltage of a first voltage line (VDD) to a voltage of a second voltage line (GND) and vice versa, comprises a current path switch circuit (111a,111b) activatable for causing a prescribed current (Is) to constantly flow between the first and second voltage lines during a time between two successive switchings of the output line, and for causing the prescribed current to be deviated (Ic1) to the output line during at least an initial phase of an output line switching from the first voltage line voltage to the second voltage line voltage or vice versa. A current delivered by the first and second voltage lines is thus kept substantially constant in the output line switching. In this way, the time derivative of the current flowing between the first and the second voltage lines is kept small and low switching noise is induced.

Abstract translation: 一种用于使集成电路输出线（OUT，OUT13 PAD）的电压（Vout）从第一电压线（VDD）的电压切换到第二电压线（GND）的电压的输出缓冲器，反之亦然， 包括电流路径切换电路（111a，111b），其能够在输出线的两次连续切换之间的时间内使规定电流（Is）恒定地在第一和第二电压线之间流动，并且使规定电流为 在从第一电压线电压切换到第二电压线电压的输出线的至少初始相位期间偏离（Ic1）到输出线，反之亦然。 因此，输出线切换中由第一和第二电压线传递的电流基本保持恒定。 以这种方式，在第一和第二电压线之间流动的电流的时间导数保持较小，并且引起低的开关噪声。