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An ultra-low-power four-channel sensor interface for wireless sensor networks employing semi-active RFID transponders as sensor nodes is described in the present paper. Each channel is based on a self-contained switched-capacitor second-order single-bit SigmaDelta-modulator operated in an incremental manner. The power consumption can be regulated through variation of the sampling frequency (max. 1...
This paper presents the implementation of an ambulatory electrocardiogram (ECG) monitoring system. The proposed system comprises current trends on ambulatory ECG monitoring like integration of the hardware in clothing, the use of low power components, wireless data transmission via Bluetooth and the use of a PDA. Differing from other approaches the signal processing was located close to the sensor...
Due to increasing range and sophistication of battery-operated applications and rising power densities due to shrinking, low-power design has become a main issue in modern CMOS technologies. One way to reduce the dissipated energy is to apply a circuit style known as adiabatic logic, that operates most efficient at moderate frequencies around 100 MHz and saves more than 80% of the energy compared...
Fine-grained sleep transistor circuits are demonstrated with 0.12 /spl mu/m 16 b MAC (multiply-accumulate unit). Standby power is reduced by a factor of 5500 at 85/spl deg/C with speed reduction of 5%. Charge recycling reduces the minimum sleep time by 25%. Dynamic power dissipation decreases by 16% activating a fraction of the switch in slow mode. Double switching inhibits power-on glitches and reduces...
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