Importance

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Abstract

A high speed CMOS current switching circuit suitable for use in digital to analog converters for graphic interfaces having high pixel clock rates (high display resolutions), and such interfaces as may be used in portable and other battery operated or low power consumption applications. In operation, the current switching circuit normally steers an idle current to ground. If the bit of the digital to analog converter input digital signal represented by the respective source is a 1, the input signal representing the bit is delayed slightly while the current steered to ground is increased from the idle value to the full desired output current, whereupon at the end of the delay, the device coupling the output current to ground is turned off, thereby forcing the output current through an output device. A MOS transistor connected as a capacitor between the delayed signal input and the node determining the gate-source voltage of the output device reduces the time required to steer the output current from ground to the output device at the beginning of the pixel display time, and from the output device back to ground at the end of the pixel time. A specific circuit implementation is disclosed.

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First Claim