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

By Taimur Rabuske, Jorge Fernandes

This e-book introduces readers to the potential for charge-sharing (CS) successive approximation sign in (SAR) analog-to-digital converters (ADCs), whereas offering wide research of the standards that restrict the functionality of the CS topology. The authors current directions and worthwhile suggestions for mitigating the constraints of the structure, whereas concentrating on the implementation below limited energy budgets and voltage supplies.

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

Example text

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. 3, 2 2 and consumes CVREF or 5CVREF , respectively. Following this reasoning, for the 3bit example, there are four possible trajectories that the ADC may take depending on the input signal. It should be noted that the charges are not necessarily moved efficiently, and a significant amount of energy is wasted during the operation.

2 Operation Modes of Charge-Based SAR ADCs . . . . . . . . . . . . . . . . . . . . . . . 1 The Charge Redistribution Principle . . . . . . . . . . . . . . . . . . . . . . . . . 2 The Charge Sharing Principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Charge Redistribution Switching Schemes . . . . . . . . . . . . . . . . . . .

E. 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 .

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