| 摘要 |
<p>An output buffer circuit for limiting ground bounce or output signal ringing. The output buffer utilizes two pull down transistors connected to two separate grounds as well as two pull up transistors connected to two separate VDD power supplies. When the buffer output is switched from high to low, a one shot switching means is provided for switching on a first pull down transistor connected to a noisy ground for a short time delay period allowing ground bounce to occur on the noisy ground, and then switching on the second pull down transistor connected to a quiet ground while switching the first pull down transistor off. Similarly, the one shot switching means switches between the two pull up transistors to limit output signal ringing on a quiet VDD power supply. The buffer circuit further includes a lead frame with separate noisy and quiet ground leads terminating in a single pin, with the noisy and quiet ground leads overlying a floating conductive plane to reduce mutual inductance. Further, buffer input signal polarity control is provided with a limited number of gate delays.</p> |
