Inverter‐based low‐power delta–sigma modulator using correlated level shifting technique. Issue 25 (1st December 2017)

• Record Type: Journal Article
• Authors: Zhang, H.; Tan, Z.; Nguyen, K.
• Is Part Of: Electronics letters. Volume 53:Issue 25(2017)
• Page Start: 1663
• Page End: 1665
• Publication Date: 2017-12-01
• Subjects: low‐power electronics -- delta‐sigma modulation -- logic gates -- operational amplifiers -- CMOS digital integrated circuits; inverter‐based low‐power delta‐sigma modulator -- correlated level shifting technique -- inverter operational‐transconductance amplifiers -- CLS technique -- DC gain -- inverter‐based OTA -- linear output swing -- CMOS technology -- second‐order delta‐sigma modulator -- signal‐to‐quantisation‐noise ratio improvement -- identical loop filter -- oversampling ratio -- gain 42 dB to 79 dB -- size 180 nm; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2017.3593
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : A low‐power delta–sigma modulator based on inverter operational‐transconductance amplifiers (OTAs) using correlated level shifting technique (CLS) is presented. The CLS technique boosts the DC gain of inverter‐based OTA from 42 to 79 dB and extends the linear output swing from 55 to 80% of the full scale. Simulation results show that design in 180 nm CMOS technology, the proposed second‐order delta–sigma modulator achieves a signal‐to‐quantisation‐noise ratio improvement of 10.4 dB compared to a conventional inverter‐based modulator implementing the identical loop filter with the same oversampling ratio.