A 3rd Order Time Domain Delta Sigma Modulator with Extended-Phase Detection
| Autor: | Timothy G. Constandinou, Lieuwe B. Leene |
|---|---|
| Přispěvatelé: | Engineering & Physical Science Research Council (EPSRC) |
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Technology Science & Technology Dynamic range Computer science 020208 electrical & electronic engineering Detector Bandwidth (signal processing) Engineering Electrical & Electronic 02 engineering and technology Delta-sigma modulation 01 natural sciences Noise shaping Engineering ADC CMOS Modulation Integrator 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Electronic engineering Time domain |
| Zdroj: | ISCAS IEEE International Symposium on Circuits and Systems (IEEE ISCAS) |
| DOI: | 10.1109/iscas.2019.8702705 |
| Popis: | This paper presents a novel analogue to digital converter using an oscillator-based loop filter for high-dynamic range bio-sensing applications. This is the first third-order feedforward ΔΣ modulator that strictly uses time domain integration for quantisation noise shaping. Furthermore we propose a new asynchronous extended-phase detection technique that increases the resolution of the 4 bit phase quantiser by another 5 bits to significantly improve both dynamic range and reduce the noise-shaping requirements. Preliminary simulation results show that this type of loop-filter can virtually prevent integrator saturation and achieves a peak 88 dB SNDR for kHz signals. The proposed system has been implemented using a 180 nm CMOS technology occupying 0.102 mm 2 and consumes 13.7 μW of power to digitise the 15 kHz signal bandwidth using a 2 MHz sampling clock. |
| Databáze: | OpenAIRE |
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