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System-Level Implementation of a Parallel-Path Hybrid Switched-Capacitor Amplifier with an Embedded Successive Approximation Register for IoT Applications
Department of Electrical Engineering, Linköping University, 58 183 Linköping, Sweden.ORCID iD: 0000-0001-7474-6428
Department of Electrical Engineering, Linköping University, 58 183 Linköping, Sweden.
Department of Electrical Engineering, Linköping University, 58 183 Linköping, Sweden.
2024 (English)In: Electronics, E-ISSN 2079-9292, Vol. 13, no 17, p. 3447-3447Article in journal (Refereed) Published
Abstract [en]

A system-level implementation of a parallel-path hybrid switched-capacitor amplifier is presented in this paper. The proposed parallel-path amplifier incorporates a gain and slew rate-boosting switching path in parallel with an embedded assisted SAR path, aiming for IoT applications. As an alternative concept to the conventional analog topologies, the proposed amplifier combines nonlinear and linear paths to provide coarse and fine amplifications. In the coarse amplification, a high current is provided through a switching path for a fraction of time, which improves the slew rate and open-loop DC gain without adding significant static current. Moreover, high accuracy is achieved through the embedded assisted SAR path, which provides a resolution of 1/2N. In addition, each extra bit of the embedded SAR path improves the total open-loop DC gain by 6 dB. The theory of operation is performed to study how the switching and assisted SAR paths can enhance the amplifier’s settling error. In addition, an existence trade-off between the coarse amplification error and the capacitive digital-to-analog converter’s number of bits is investigated. The theory and system-level simulation show that the gain and slewing restrictions of the conventional topologies, especially in advanced CMOS technology, can be handled much easier by this parallel combination, where the switching path and assisted SAR path combination provides a high slewing capability and high DC open-loop gain.

Place, publisher, year, edition, pages
2024. Vol. 13, no 17, p. 3447-3447
Keywords [en]
parallel-path amplifier; switched-capacitor amplifier; hybrid amplifier
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:liu:diva-208084DOI: 10.3390/electronics13173447OAI: oai:DiVA.org:liu-208084DiVA, id: diva2:1902704
Available from: 2024-10-02 Created: 2024-10-02 Last updated: 2024-10-02

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