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This paper presents a remotely powered sensing tag for biomedical applications. Energy is transfered by an EM-field to a dual frequency band antenna and fed to an analog front end. The AC voltage resulting on the antenna gets rectified, pumped to 3.3V and stored in an 2.2μF buffer capacitor. When the buffer capacitor is full a measurement with an integrated impedance measurement circuit can be processed...
This paper presents a successive approximation analog to digital converter with a configurable resolution of 8 or 11 bit. The resolutions are achieved by combining an 8 bit split capacitor array with a 3 bit resistive ladder allowing for a simpler layout and good power efficiency. Configurable buffers are included and enable a wide range of operation frequencies. Sample rates between 300S/s and 80kS/s...
This paper presents a bandgap reference capable of operating at supply voltages below 1V. In contrast to the vast majority of bandgap circuits the multiplication of the proportional to absolute temperature voltage is done by a switched capacitor network. Thus a reduced chip area is achieved. As a clock is needed for the switching, a relaxation oscillator is deeply integrated into the circuit. Combined...
The design of a fully integrated low-voltage charge pump for thermal electric energy harvesting is presented in this paper. The proposed circuit has a startup voltage of 135mV without the need of expensive low voltage process options. This behavior is achieved by automatic frequency adaptation in correlation to the resistance of the switches. After startup the input voltage may even drop below 100mV,...
This paper presents an innovative switched capacitor voltage regulator dedicated to ultra-low power wireless sensor nodes. The regulator supports most of the different power supplies used to power such sensor nodes. Using a linear regulator in parallel improves the dynamic response compared to state-of-the-art switched capacitor regulators. Measuring the load current allows adapting the oscillator...
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