Design of a 1.1 GSps 12 bit digital to analog convertor with 56 dBc SFDR at Nyquist frequency
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High speed digital to analog convertor (DAC) is a key component in software defined radio systems, digital radars and wide band arbitrary waveform generators. In those applications, the performance of the DAC, especially the wideband dynamic range, is important in determining the system performance. In this paper we present a high speed 12 bit current steering DAC with optimized wideband performance. Theoretical analysis and optimizing strategy are present in this paper along with circuit details and measurement results. Experimental results reveal the proposed circuit is capable to operate up to 1.1 GSps. The measured spurious free dynamic range (SFDR) at low frequency is above 70 dBc at 1.1 GHz of sample rate. The SFDR is better than 56 dBc from DC to Nyquist frequency.
KeywordsDigital-to-analog converter (DAC) Spurious free dynamic range (SFDR) Wide-band GaAs HBT
- 4.Razavi, B. (1995). Priciple of data conversion system design. New York: Wiley-IEEE Press.Google Scholar
- 7.Jewett, B., Liu, J., Poulton, K. (2005). A 1.2 GS/s 15 b DAC for precision signal generation. In: IEEE ISSCC Dig. Tech. Papers, pp. 110–112.Google Scholar
- 8.Baek, K. H., Choe, M. J., Merlo, E., & Kang, S. M. (2003). 1 GS/s, 12-bit SiGe BiCMOS D/A convertor for high-speed DDFs. Proceedings—International Symposium on Circuits and Systems, 1, 901–904.Google Scholar