1-GS/s, 12-bit SiGe BiCMOS D/A converter for high-speed DDFs

This paper presents a 1-GS/s, 12-bit SiGe BiCMOS D/A converter combined with high-speed low-spurious BiCMOS current switches and an efficient calibration method for current mismatch. Experimental results show a reduction in INL and DNL errors from +35.5/-62.2 LSB to +4.1/-3.4 LSB and from +8.1/-10.3 LSB to +6.2/-1.2 LSB, respectively, after calibration. SFDR performance is 72.3 dBc at output frequency of 1.82 MHz and 50.0 dBc at output frequency of 334.39 MHz, when the sampling clock frequency is 1 GHz. Power consumption is about 950 mW at 100.48MHz output frequency and -3.3 V power supply.