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A calibration-free, high-resolution analog-to-digital converter designed for a bioluminescence sensor array employs incremental sigma-delta (ΣΔ) modulation to combine the advantages of oversampling with an input multiplexing capability. The resolution of incremental ΣΔ modulators can be improved significantly by means of a technique similar to extended counting. In the approach proposed in this paper,...
The implementation of a complete low-power microphone uplink system is presented. The system comprises a low-dropout regulator (LDO), an input operational transconductance amplifier (OTA), and a 3rd order continuous-time sigma-delta (SigmaDelta) modulator. The LDO provides biasing to the microphone and OTA input. The OTA presents high input impedance to the microphone and act as a pre-amplifier. The...
We present a CT-DeltaSigma modulator operating at a sampling rate of 300 Msps in a 0.18 mum CMOS process. A low power four bit flash ADC and a complementary current-steering DAC are used to reduce power and noise. The opamps used in the active-RC loop filter are deliberately made slow to further reduce current consumption and the resulting loop delay is compensated. The modulator achieves a peak SNR...
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