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This paper presents a compact fully-integrated charge pump based voltage doubler for self-powered implantable retinal prostheses. The target input voltage is 0.55 V to meet the output voltage of on-chip photovoltaic cells, and the target output is around 1 V to provide sufficient current for neuron stimulation. Several techniques are adopted in the proposed design, including gate-boosting circuits...
This paper presents a fully integrated DC/DC converter capable of supply a battery-less sensor by extracting the power from thermoelectric generators (TEGs) on a wide temperature gradient range (3K to 12K). The power management unit of the converter enables to directly power a sensor with a 1.2V output regulated voltage for continuous low power sensing operations. It can also manage larger power consumption...
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 RF (Radio Frequency) energy harvesting circuit with Dickson charge pump. The harvesting circuit harvested RF energy from a radio station which has 100 kW of a transmission power, at 954 kHz. The circuit is composed of a loop antenna, a 6-stage Dickson charge pump and an output capacitor as an energy storage element. The charge pump steps up the input voltage to the six times,...
This paper presents an implementation of a fully-integrated switched capacitor voltage converter with self-adjusting source loading. A charge control unit ensures improved load matching to the power source, which can be an RFID antenna or vibration energy harvesting generator. In conjunction with an adaptive stacking scheme voltage-up conversion is also realized leading to capacitor storage voltages...
The paper presents a low-threshold voltage multiplier circuit that can be used for harvesting energy from ambient radio-frequency (RF) signals. At the core of the circuit is a charge-pump based on CMOS floating-gate transistor diodes (FGTD) whose threshold voltage can be adjusted using indirect programming. We show that the diodes can achieve threshold voltages less than 50 mV, which is typically...
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