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1992
Conference Paper
Titel
Mismatch of current sources and accuracy of D/A converters in 0.5 mu m GaAs/GaAlAs HEMT technology
Abstract
GaAs/GaAlAs HEMT current source mismatch and digital-to-analog converter (DAC) accuracy have been analysed and measured. Using Raytheon's semi-empirical model and experimental based data, the mismatches in devices and current sources are predicted and their results agree with measurements. The high-precision DACs are also analysed in the cases of mismatching in the current sources and resistors. An 8-bit DAC has been implemented in a 0.5 mu m HEMT technology and its measured accuracy is verified to be identical to the prediction.