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A pair of completely integrated capless preamplifiers (not requiring external capacitance) for MEMS microphones are presented. The devices exploit specific circuit solutions to implement a proper dc biasing of the pre-amplifier and a low frequency (< 1 Hz) high-pass pole. The two solutions adopted are a based on a transistor in the off state (OTP) and a switched-resistor (SRP), respectively. Since...
This work lies within SCALTECH28 project, whose main purpose is to investigate the performance of the 28nm technology in terms of signal processing quality, power consumption, and radiation hardness for applications in instrumentation electronics for particle physics with respect to previous technological generations. An additional target is to experimentally evaluate radiation damage effects on single...
This paper proposes two fully-integrated cap-less (i. e. without external capacitor) preamplifiers for silicon microphones. Proper dc biasing of the preamplifier is obtained with two solutions to implement a large feedback resistance (in the GO range), based on a switched resistor and a transistor in the off state, respectively. Both solutions have been implemented in a 0.18-μm CMOS technology and...
A 3rd-order continuous-time ΣΔ modulator for MEMS microphones in 0.16-μm CMOS technology achieves 106.7-dB DR and 93.2-dB peak SNDR, consuming 390 μW from a 1.6-V power supply and occupying an area of 0.21 mm2. The ΣΔ modulator, based on a feedforward architecture, uses only two operational amplifiers for achieving the 3rd-order loop-filter transfer function, a 15-level quantizer, and a feedback DAC...
This paper presents a 4th-order low-pass continuous-time filter with 24MHz bandwidth. Using cross-coupled MOS transistors combined with capacitors and resistors, this architecture synthesizes two complex-conjugate-poles pairs. The filter is designed and optimized to feature high-linearity along all filter passband, and, in particular, at the cut-off frequency edge. The filter consumes 100μA with 1...
In this paper the effect of colored clock jitter on audio continuous-time ΣΔ modulators is studied. The results demonstrate the importance of using the correct model for the jitter on the clock signal, especially when it is generated by a phase-locked loop, as it is the case in most audio applications. The paper demonstrates that the popular clock signal model with white jitter noise spectrum leads...
In this paper a 0.35μm CMOS complete gas-sensor array front-end circuit is presented. The device provides measured read-out dynamic range of 162dB and effective independent row temperature regulation of 1.5°C within the range [25°C-500°C]. The overall system features a power consumption of 2mW/sensor and may be completely configured and read-out thanks to an embedded I2C bus interface, thus allowing...
This paper presents a continuous-time ΣΔ ADC for MEMS microphone integrated interface applications. The ΣΔ modulator features a 3rd-order loop filter realized with only two operational amplifiers to reduce power consumption. It exploits a 15-level quantizer and 3-MHz sampling frequency to minimize the impact of clock jitter. The proposed architecture can handle an excess loop delay of half period...
An I2C programmable 0.35µm CMOS System-on-Chip (SoC) for bi-dimensional gas-sensor arrays providing extended dynamic range read-out with suitable embedded A/D converter and digitally controlled row temperature has been developed. The SoC also features low-power consumption, low-cost production, wide re-configurability and thus large scale compliance with several types of micro-sensors, achieving maximum...
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