A 12 bit 1 GS/s Dual-Rate Hybrid DAC With an 8 GS/s Unrolled Pipeline Delta-Sigma Modulator Achieving > 75 dB SFDR Over the Nyquist Band

作者：Su Shiyu^*; Tsai Tu I; Sharma Praveen Kumar; Chen Mike Shuo Wei

来源：IEEE Journal of Solid-State Circuits, 2015, 50(4): 896-907.

DOI：10.1109/JSSC.2014.2385752

• Calibration
• current steering
• DAC
• delta-sigma modulator
• dual-rate
• high resolution
• high speed
• hybrid
• pre-distortion

A 12 bit Dual-Rate Hybrid digital-to-analog converter (DAC) architecture with a split Nyquist (1 GS/s) and delta-sigma modulator path (8 GS/s) is proposed and implemented in 65 nm CMOS. Based on the hybrid architecture, the delta-sigma-assisted pre-distortion scheme compensates for the current steering cell mismatch, which further reduces the analog circuit complexity and area. The proposed 8X unrolled pipeline delta-sigma modulator allows for high-speed third-order noise shaping with a digital standard cell design flow. The measured spurious-free dynamic range achieves 91-76 dB over the 500 MHz Nyquist band. The proposed DAC architecture is mostly digital and hence favors future technology scaling.

• 出版日期2015-4