BigPatents India

The present invention provides a low noise output buffer capable of operating at high speeds. High-speed I/O buffers require delicate handling of the noise on the supply buffers; this requires the control of current slew rate not only on the rising edge of current but also on the falling edge of the current. A novel method/apparatus has been proposed for controlling the current slew rate on falling edge in high speed output driver charging/discharging heavy load widthout affecting the speed of the driver, which otherwise would have created supply/ground bounce due to parasitics present in the bonding wires, package pins and on-chip metal interconnects in the IO ring. In one embodiment of the invention, a simple circuit has also been proposed which suppresses the supply/ground noise by a very significant level while incurring small penalty in terms of silicon area and power dissipation.