A low-power CT 2nd order Delta Sigma modulator using a new design methodology for biomedical applications

Hemmati, Firoz; Aghdam, Esmaeil Najafi

doi:10.1016/j.aeue.2021.153779

Cited by 9 publications

(1 citation statement)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared to SC, CT architecture consumes less power due to inherent anti-alias filtering that obviates the need for a dedicated analog filter required in the signal acquisition system. In order to attain high resolution, wide dynamic range and low power consumption CTΣΔMs are used with active integrators [13][14][15]. Active RC and Gm-C based are the two types of CTΣΔM structures.…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of a Second Order Continuous-Time ΣΔ Modulator for ECG Signal Acquisition

Kavitha

Akhila²,

Kannan

2023

Eng. Technol. Appl. Sci. Res.

View full text Add to dashboard Cite

The recent developments in biosignal acquisition devices for continuous supervision of cardiovascular signs of high-risk patients require a high-precision and low-power Analog Front End (AFE) circuit. The proposed design adopts Continuous-Time (CT) Sigma-Delta Modulator (ΣΔM) architecture to achieve high resolution and SIgnal-to-Noise And Distortion ratio (SINAD) requirements. The proposed modulator is a second-order CT-ΣΔM with Cascade of Integrators Feed-Forward (CIFF) architecture that consists of a CT loop filter, a single-bit quantizer, and a Digital-to-Analog Converter (DAC). The use of single-bit quantization in the design reduces circuit complexity and power consumption. To use the designed ΣΔM for measuring ECG signals, a bandwidth (Bw) of 150 Hz is considered with a sampling frequency (fs) of 153.6kHz to achieve an oversampling ratio of 512. The design is simulated in a standard Cadence Virtuoso EDA tool at 180nm CMOS technology, operating at 1.8V supply voltage at the block level. The simulation results for the designed modulator show that SINAD is 104.5dB, the Effective Number Of Bits (ENOB) is 17.06bits, with power consumption of 24µW, and achieves Schreier’s Figure-Of-Merit (FOM) equal to 172.45dB.

show abstract

Section: Introductionmentioning

confidence: 99%