Low-Power Low-Voltage ΔΣ Modulator Using Switched-Capacitor Passive Filters.
2015 (English)In: VLSI-SoC: At the Crossroads of Emerging Trends: 21st IFIP WG 10.5/IEEE International Conference on Very Large Scale Integration, VLSI-SoC 2013, Istanbul, Turkey, October 6-9, 2013, Revised Selected Papers / [ed] Alex Orailoglu, H. Fatih Ugurdag, Luís Miguel Silveira, Martin Margala and Ricardo Reis, Springer-Verlag New York, 2015, 94-118 p.Chapter in book (Refereed)
A low-voltage low-power fourth-order active-passive ΔΣ modulator with one active stage is presented. The input-feedforward architecture is adopted, which improves the voltage swing prior to the quantizer. This enables a simpler comparator design and cascade of three passive filters. The passive integrator, as an alternate option to its power-hungry active counterpart, and the non-idealities associated with it are investigated. The active integrator used at the input stage provides most of the loop gain, which suppresses the thermal noise from the succeeding stages and minimizes the non-idealities in the comparator, such as noise and offset. The active integrator employs a two-stage amplifier with load compensation, whose DC-gain is boosted by a partially body-driven technique. The modulator, operated from a 0.7 V supply and clocked with 256 kHz sampling frequency, achieves 84 dB SNR and 80.3 dB SNDR over a 500 Hz signal bandwidth, while it dissipates only 400 nW power.
Place, publisher, year, edition, pages
Springer-Verlag New York, 2015. 94-118 p.
, IFIP Advances in Information and Communication Technology, ISSN 1868-4238 ; 461
Passive integrator, Delta-sigma modulator, Low-voltage, Low-power, Active-passive modulator, Feedforward architecture
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:liu:diva-122712DOI: 10.1007/978-3-319-23799-2_5ISI: 000364780900005ISBN: 978-3-319-23798-5 (print)ISBN: 978-3-319-23799-2 (online)OAI: oai:DiVA.org:liu-122712DiVA: diva2:872002