A Novel Interpolation Scheme and Apparatus to Extend DAC Usable Spectrum over Nyquist Frequency

Authors: Wang liguo, Wang zongmin, Kong ying

Abstract:

A novel interpolation scheme to extend usable spectrum and upconvert in high performance D/A converters is addressed in this paper. By adjusting the pulse width of cycle and the production circuit of code, the expansion code is a null code or complementary code that is interpolation process. What the times and codes of interpolation decide DAC works in one of a normal mode or multi-mixer mode so that convert the input digital data signal into normal signal or a mixed analog signal having a mixer frequency that is higher than the data frequency. Simulation results show that the novel scheme and apparatus most extend the usable frequency spectrum into fifth to sixth Nyquist zone beyond conventional DACs.

Keywords: interpolation, upconversion, modulation, switching function, duty cycle.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1055088

References:

[1] A. V. den Bosch, M. A. F. Borremans, M. S. J. Steyaert, and W. Sansen, A 10-bit 1-GSample/s Nyquist Current-Steering CMOS D/A Converter, IEEE J. Solid-State Circuits vol. 36, no. 3, 2001, pp. 315-324.
[2] G. A. M. V. der Plas, J. Vandenbussche, W. Sansen, M. S. J. Steyaert, and G. G. E. Gielen,A 14-bit Intrinsic Accuracy Q2 Random Walk CMOS DAC, IEEE J. Solid-State Circuits vol. 34, no. 12, 1999, pp. 1708-1718.
[3] C.-H. Lin, F. M. der Goes, J. R. Westra, J. Mulder, Y. Lin, E. Arslan, E. Ayranci, X. dong Liu, and K. Bult,A 12 bit 2.9GS/s DAC With IM3- 60dBc Beyond 1 GHz in 65nm CMOS, IEEE J. Solid-State Circuits vol. 44, no. 12, 2009, pp. 3285-3293.
[4] D. A. Mercer,LOW POWER APPROACHES TO HIGH SPEED CMOS CURRENT STEERING DACS, IEEE Custom Intergrated Circuits Conference 2006, pp. 153-160.