12b 100MS/s 1.1V 0.43mm 2 ADC optimized in a 45nm CMOS technology

This paper proposes a 12b 100MS/s four-step pipeline ADC optimized in a 45nm CMOS for low-power communication systems. The input SHA employs a gatebootstrapping switch to sample wide band input signals with an accuracy of 12 bits or more. The SHA and MDACs adopt a two-stage amplifier with gain-boosting circuits to achieve the required DC gain and high signal swing range. Cascode and Miller frequency-compensation schemes are selectively used for wide bandwidth and stable signal settling. The constant gate and drain voltages of cascode current mirror transistors based on on-chip reference currents minimize current mismatch by process and supply variations. The prototype ADC shows a measured DNL and INL within 0.88LSB and 1.46LSB, while consuming 29.8mW at 1.1V and 100MS/s with a maximum SNDR and SFDR of 61.0dB and 74.9dB, respectively.

[1]  Un-Ku Moon,et al.  Low voltage high-SNR pipeline data converters , 2004, The 2nd Annual IEEE Northeast Workshop on Circuits and Systems, 2004. NEWCAS 2004..

[2]  Man-Kay Law,et al.  Ultra-area-efficient three-stage amplifier using current buffer Miller compensation and parallel compensation , 2012 .

[3]  Hae-Seung Lee,et al.  A zero-crossing based 12b 100MS/s pipelined ADC with decision boundary gap estimation calibration , 2010, 2010 Symposium on VLSI Circuits.

[4]  Ho-Young Lee,et al.  A 3.0V 12b 120 Msample/s CMOS pipelined ADC , 2006, 2006 IEEE International Symposium on Circuits and Systems.

[5]  Seung-Hoon Lee,et al.  A Single Amplifier-Based 12-bit 100 MS/s 1 V 19 mW 0.13 µm CMOS ADC with Various Power and Area Minimized Circuit Techniques , 2011, IEICE Trans. Electron..

[6]  Michael P. Flynn,et al.  A SAR-Assisted Two-Stage Pipeline ADC , 2011, IEEE Journal of Solid-State Circuits.

[7]  Seung-Hoon Lee,et al.  A 0.31 pJ/Conversion-Step 12-Bit 100 MS/s 0.13 µm CMOS A/D Converter for 3G Communication Systems , 2009, IEICE Trans. Electron..

[8]  Seung-Hoon Lee,et al.  A 1.2-V 12-b 120-MS/s SHA-Free Dual-Channel Nyquist ADC Based on Midcode Calibration , 2009, IEEE Transactions on Circuits and Systems I: Regular Papers.