A Low-Power CT Incremental 3rd Order Sigma Delta ADC for Biosensor Applications
2013 (English)In: IEEE Transactions on Circuits and Systems. Part 1: Regular Papers, ISSN 1549-8328, Vol. 60, no 1, 25-36 p.Article in journal (Refereed) Published
This paper proposes a 3rd order single-loop continuous-time incremental sigma-delta analogue-to-digital converter (ADC) for time-multiplexed signals. Incremental sigma-delta modulation is used to address medium to high resolution requirements of multi-channel applications, while a 3rd order continuous-time implementation is investigated as an alternative for low-power solutions. A prototype of the proposed modulator, running at 320 kHz, has been fabricated in a 0.15- mCMOStechnology,while the synchronization circuitry to allow incremental operation was built on-board. Measurement results show that the ADC achieves 65.3 dB peak SNR, 64 dB peak SNDR and 68.2 dB dynamic range over a 2 kHz bandwidth. The modulator’s power dissipation is 96 W from a 1.6 V power supply. This translates into the best figure-ofmerit when compared to recently published continuous-time alternatives, while being competitive with respect to state-of-the-art discrete-time counterparts.
Place, publisher, year, edition, pages
IEEE Press, 2013. Vol. 60, no 1, 25-36 p.
analog-to-digital conversion, incremental, sigma-delta, continuous-time
Research subject SRA - ICT
IdentifiersURN: urn:nbn:se:kth:diva-109780DOI: 10.1109/TCSI.2012.2215753ISI: 000313430000004ScopusID: 2-s2.0-84872104734OAI: oai:DiVA.org:kth-109780DiVA: diva2:584207
FunderSwedish Research Council
QC 201301312013-01-312013-01-082013-02-12Bibliographically approved