Circuits

Charge-Sharing SAR ADCs for Low-Voltage Low-Power by Taimur Rabuske, Jorge Fernandes

By Taimur Rabuske, Jorge Fernandes

This publication introduces readers to the possibility of charge-sharing (CS) successive approximation sign up (SAR) analog-to-digital converters (ADCs), whereas delivering huge research of the standards that restrict the functionality of the CS topology. The authors current guidance and beneficial suggestions for mitigating the restrictions of the structure, whereas targeting the implementation lower than limited strength budgets and voltage supplies.

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Once the sampling is finished, these capacitors are disconnected from the input. Then, in the top array, the MSB-capacitor is connected to VREF while the remaining capacitors are connected to ground. On the bottom-array, the opposite is done. For the 3-bit example, this 2 operation results in an energy consumption of 4CVREF . The comparator is activated, and the result dictates the MSB of the output word. Depending on whether the MSB is “0” or “1,” the DAC takes the “up” or “down” transition, as depicted in Fig.

P. 4- to-1 V power scalable SAR ADC, in IEEE International Solid-State Circuits Conference (ISSCC) (2011), pp. 190–192, isbn:978-1-61284-303-2. 5746277 (cit. on p. 14) 26. M. Goodall, Telephony by pulse code modulation. Bell Syst. Tech. J. 26(3), 395–409 (1947). x (cit. on p. 21) 27. B. Gordon, R. Talambiras, Signal conversion apparatus, US patent 3,108,266, 1963 (cit. on p. 21) 28. W. ), Data Conversion Handbook (Newnes, Oxford, UK, 2005). isbn:978-0-75067841-4. (cit. on p. 21) 29. -H. -J. -H.

3 VCM -Based Capacitor Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Tri-Level Capacitor Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Charge Sharing Switching Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Comparison of Reviewed Switching Schemes . . . . . . . . . . . . . . . . . . . . .

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