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Over the last few years, robust MEMS microphones have gained significant market share in consumer applications such as mobile phones and hearing aids. The consumer market is demanding improved quality for audio recording, while also being capable of suppressing high-energy disturbers, e.g., wind noise. The challenge is to achieve both high DR and SNR at low supply voltages that limit signal swing...
This paper presents a novel technique to extend the bandwidth of oversampled Analog-to-Digital Converters and a method to optimize their design to avoid instability, when oversampling has to be preserved and clock frequency cannot be increased. This proposal allows the converter to increase the resolution only introducing minor circuit modifications when processing input signals in the extended band...
This paper presents a novel technique to extend the bandwidth of oversampled Analog-to-Digital Converters (ADCs) when clock frequency cannot be increased and oversampling has to be preserved. The Signal Transfer Function (STF) of the converter is modified to boost the signal in the extended band. The modification keeps the noise transfer function (NTF) unaffected, and therefore, there is no need of...
Capacitive or resistive sensors can be included in the feedback network of an oscillator to implement a data acquisition system. A higher sampling rate, compared with standard oversampled converters, is required to maintain a sufficient SNR in this case. In this paper, we propose an architecture based on a LC-CMOS oscillator and a digital interface that can be completely integrated on chip and satisfies...
This paper shows a novel capacity to digital measurement circuit that is suited for differential MEMS capacitive sensors such as pressure sensors or condenser microphones. The basic operating principle relies on two differential reactance-controlled multivibrator circuits whose frequency differences are sensed by a Time to Digital Converter. The multivibrator oscillators may be biased in the relaxation...
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