University of Twente Student Theses
Input Signal Power Reduction Techniques in Successive Approximation Register ADCs
Mensink, D.J.G. (2024) Input Signal Power Reduction Techniques in Successive Approximation Register ADCs.
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| Full Text Status: | Access to this publication is restricted |
| Embargo date: | 5 July 2029 |
| Abstract: | In this paper, four different techniques are discussed to achieve input signal power reduction in Successive Approximation Register (SAR) Analog-to-Digital Converters (ADCs). SAR ADCs are widely used in low-power, low-speed applications such as IoT devices and microcontrollers. Because a SAR ADC is used in lower power applications, the output power of such a sensor cannot drive the capacitor network when sampling. Therefore, an input buffer is needed to transfer the desired signal to the ADC without attenuation. The goal is to compare the different techniques that lower the current going into the capacitor network of the ADC while sampling. Reducing this current relaxes the requirements and power consumption of the buffer. The techniques discussed are: Input Swapping (IS), Range Pre-Selection Sampling (RPSS), Input Correlated Swap Sampling (ICSS) and Pre-Charging with Flash ADC (Flash), with the Conventional Procedure (CP) as control. Evaluation of each technique is done by simulating the RMS input current, peak input current and the Total Harmonic Distortion (THD). The simulation settings and setup are equal for each technique, in order to make a fair comparison. From the simulation results it can be concluded that the Flash technique yields the lowest overall RMS input current across the entire frequency range up to Nyquist. For the peak input current the RPSS technique yields the lowest peak. With the Flash technique the THD degrades by 13.9 dB compared to the CP when the input frequency is close to Nyquist. For the RPSS technique this degradation is 25.3 dB. |
| Item Type: | Essay (Bachelor) |
| Faculty: | EEMCS: Electrical Engineering, Mathematics and Computer Science |
| Subject: | 53 electrotechnology |
| Programme: | Electrical Engineering BSc (56953) |
| Link to this item: | https://purl.utwente.nl/essays/101553 |
| Export this item as: | BibTeX EndNote HTML Citation Reference Manager |
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