Output buffer design for low noise and load adaptability

A new output buffer design for low switching noise and load adaptability is presented. Instead of using a current source, a current limiter is proposed to reduce the switching noise and static power dissipation. Output ringing is lowered by turning off the driver stage near the end of the output transition automatically. Compared with previous designs, the proposed buffer has less switching noise and improved output ringing and speed. The proposed method is simple and effective, without the necessity for a feedback control circuit.