Showing papers in "IEEE Transactions on Circuits and Systems in 2010"
TL;DR: This paper presents a 10-bit 5-5 segmented current- steering digital-to-analog converter implemented in a standard 130-nm CMOS technology that achieves full-Nyquist performance up to 1 GS/s and maintains 54-dB SFDR over a 550-MHz output bandwidthup to 1.6GS/s.
Abstract: This paper presents a 10-bit 5-5 segmented current- steering digital-to-analog converter implemented in a standard 130-nm CMOS technology. It achieves full-Nyquist performance up to 1 GS/s and maintains 54-dB SFDR over a 550-MHz output bandwidth up to 1.6 GS/s. The power consumption for a near-Nyquist output signal sampled at 1.6 GS/s equals 27 mW. To enable the presented performance a design strategy is proposed that introduces a switch-driver power consumption aware analysis of the switched current cell. The analysis of the major distortion mechanisms in the switched current cell allows the derivation of a design strategy for maximum linearity. This strategy is extended to include the power consumption of the switch drivers in function of the switched current cell design. To minimize the digital power consumption, low-power implementations of the thermometer decoder and switch driver circuits are introduced.
87 citations
Journal Article•
TL;DR: A sum of the absolute transformed differences (SATD)-based mode decision algorithm, which incorporates both SATD and the variance information into the RDO mode decision method, is proposed, which can achieve a significant improvement in computation and time saving.
Abstract: In this letter, a rate estimation technique using transform coefficient variance is proposed in the rate-distortion cost function for intra mode decision. The new cost function achieves better coding performance than the cost function using the ?-domain model. The new cost function brings out an average speed-up factor of 13 when compared with the rate-distortion optimization (RDO) mode decision, but with considerable degradation in rate-distortion performance. To improve the coding performance, we propose a sum of the absolute transformed differences (SATD)-based mode decision algorithm, which incorporates both SATD and the variance information into the RDO mode decision method. The results show that the SATD-based mode decision scheme can achieve a significant improvement in computation (with 21% of total encoding time, or a speed-up factor of 5) with negligible peak signal-to-noise ratio loss. The proposed algorithm is also compared with two other distinct algorithms , and the results indicate that the proposed algorithm outperforms these two edge detection algorithms in coding performance, as well as time saving.
49 citations