Name
Abstract | ||
|---|---|---|
A 0.4-V opamp-less ΣΔ modulator for biomedical applications is presented. The continuous-time (CT) 2nd order ΣΔ modulator is realized using a passive filter topology. In order to obtain a small area, all capacitors are realized using parallel compensated depletion-mode MOSCAPs. To maximize the performance, genetic algorithms (GAs) are used to optimize the circuit for smaller area and higher signal-to-noise-plus-distortion ratio (SNDR). In the dynamic comparator, which is the only active block in the circuit, bulk-driven technique is used to obtain lower supply voltage operation. The circuit was designed in a 130 nm CMOS technology and, using a clock frequency of 2 MHz, has a bandwidth of 10 kHz to cover the most common bio-potential signals. The electrical transient noise simulation results show that the circuit achieves a peak SNDR of 58 dB and a dynamic range of 64 dB while dissipating only 410 nW, which corresponds to an energy efficiency of 32 fJ/conv.-step. |
Year | DOI | Venue |
|---|---|---|
2014 | 10.1109/ISCAS.2014.6865391 | Circuits and Systems |
Keywords | Field | DocType |
CMOS integrated circuits,biomedical electronics,continuous time filters,genetic algorithms,passive filters,sigma-delta modulation,2nd order ΣΔ modulator,CMOS technology,GA,MOSCAPs,SNDR,bandwidth 10 kHz,bio-potential signals,biomedical applications,bulk-driven technique,clock frequency,dynamic comparator,electrical transient noise simulation,energy efficiency,frequency 2 MHz,genetic algorithms,noise figure 58 dB,noise figure 64 dB,opamp-less continuous-time ΣΔ modulator,parallel compensated depletion-mode,passive filter topology,power 410 nW,signal-to-noise-plus-distortion ratio,size 130 nm,voltage 0.4 V | Comparator,Capacitor,Computer science,Electronic engineering,CMOS,Bandwidth (signal processing),Low voltage,Transconductance,Electrical engineering,Clock rate,Operational amplifier | Conference |
Citations | PageRank | References |
2 | 0.45 | 5 |
Authors | ||
4 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| João L. A. de Melo | 1 | 2 | 0.45 |
| Fábio Querido | 2 | 2 | 0.45 |
| Nuno F. Paulino | 3 | 72 | 24.92 |
| João Goes | 4 | 2 | 0.45 |