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A CAD Tool for the top down synthesis of first and second order oversampled CMOS A/D converters has been developed. Starting from converter and technology specifications, the program generates all required system specifications as well as all device dimensions and bias currents of the sub-blocks.
This paper introduces a low-noise, low-power amplifier for high-impedance sensors. An innovative circuit using an auto-zeroed architecture combined with frequency modulation to reject offset and low-frequency noise is proposed and analysed. Special care was given to avoid broadband noise aliasing and chopping in the signal path, and to minimize both the resulting equivalent input offset voltage and...
A 1 V wireless SoC embedding an RF transceiver, a sensor interface, a 6.4 MHz RISC micro-controller with an 8k instruction SRAM and a power management unit is reported. The radio supports 25 kb/s FSK and 2 kb/s OOK modulations in the 433/868 MHz bands. In the 433 MHz band, the receiver draws 2.1 mA while providing a sensitivity of -108 dBm and the transmitter draws 27.6 mA for an output power of 10...
This paper presents the development of a full custom low power, mixed-mode, analog digital front-end chip for audio applications. The front-end is used with a full custom DSP ASIC in a high performance hearing aid system. The front-end implements functions as preamps, low power stereo audio analog to digital converters, remote-control receiver, high PSSR power supplies, time base, voltage reference...
A capacitive pressure sensor interface circuit featuring micropower consumption is presented. The sensitivity to leakage currents has been reduced, allowing operation at temperatures up to 130??C. Special attention has been paid to minimise aliasing in the sampled interface. An optimal combination of contradictory requirements on power consumption, temperature range and sampling speed was obtained...
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