C. Su, D.G. Chen, and R.L. Geiger (USA)
Dynamic performance, Spurious free dynamic range (SFDR), nonlinearities, dynamic calibration.
High accuracy Digital to Analog Converters (DACs) are becoming increasingly important as the common used building block in communication systems. Dynamic performance of such DACs at high frequencies is of particular interest with the increasing of the update rate. For the DACs’ performance, the dynamic performance is often characterized by the spurious free dynamic range (SFDR) and the SFDR is limited by the spectral harmonics that are attributed by system nonlinearities. In this paper, the dynamic nonlinearity is analyzed and its effect on the output waveform is discussed. A novel approach is proposed to calibrate the dynamic errors. The validity of this technique is demonstrated with a 12-bit current steering DAC. Simulation results show the SFDR can be correspondingly significantly improved by using this calibration scheme.
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