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 vast research of the criteria that restrict the functionality of the CS topology. The authors current directions and precious suggestions for mitigating the constraints of the structure, whereas targeting the implementation below constrained strength budgets and voltage supplies.

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Additional info for Charge-Sharing SAR ADCs for Low-Voltage Low-Power Applications

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2). t2 /. 4) In practical implementations of CR-based ADCs, the TH functionality is merged into the capacitive array. e. t0 / D Vin . The ability to shift the voltage up and down in controlled steps (DAC functionality) is attained by using multiple capacitors with switchable bottom plates, such as C1 in the example. Most commonly, these capacitors have binary weights of capacitance. 2 The Charge Sharing Principle In CS-based ADCs, the DAC output is changed by connecting precharged capacitors to the DAC nodes.

Q D CV, while still maintaining control over the input range of the ADC. This approach is depicted in Fig. 11. In the two simplified 3-bit implementations, the differential input range was maximized and lays between VREF and VREF . While using VDD to precharge the array (Fig. 11a), the proper size of the TH capacitors is 8C, and the energy a b Fig. 11 CS-ADCs with different precharge voltage VPC and same input range: (a) VPC D VDD and CTH D 8C and (b) VPC D VCM and CTH D 4C 42 3 Review of SAR ADC Switching Schemes consumption becomes 3CVDD 2 .

Depending on whether the comparator result is a “0” or a “1,” the largest capacitor of the top array is discharged to ground or charged to VREF , respectively. The opposite is done for the bottom array. This procedure is adopted for all the remaining bits in the converter. 3 Charge Redistribution Switching Schemes Fig. 5 VCM -based (MCS) CR switching scheme waveform and conversion procedure 33 34 3 Review of SAR ADC Switching Schemes conventional switching scheme. Further improvement in the energy efficiency is achieved by moving the voltages by only VREF VCM in the top and bottom arrays, instead of a full VREF -step, as happens in the monotonic and the conventional procedure.

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