Bias current network for IC digital-to-analog converters and the like

DETAILED DESCRIPTION In accordance with one important aspect of the invention, there is disclosed herein a digital-to-analog converter incorporating a superior buffer amplifier capable of producing an output voltage between zero and some nominal value while operating from a single supply.
In accordance with another aspect of the invention, there is provided a simplified one-transistor current-source cell capable of operation directly with I.
sup.
2 L switching logic, to permit a significant reduction in part count of the chip.
In still another aspect of this invention, a converter is provided having a novel simplified reference supply for regulating the gain of the current sources to stabilize the output current of the converter.
In yet another aspect of the invention, a converter bias current network is provided having high efficiency, and thus reducing the required power while still achieving excellent performance.
Other objects, aspects and advantages of the invention will be pointed out in, or apparent from, the following detailed description of a preferred embodiment of the invention, considered together with the accompanying drawings.