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Phase Locked Loop (PLL) is basic building block of several communication systems to achieve synchronization. In this paper the PLL is designed using improved performance ring VCO with 0.18 μm CMOS technology and supply voltage of 3 V. The proposed ring VCO which has higher tuning range is used for implementation of PLL in order of GHz frequency range. The phase frequency detector (PFD) is another...
To increase the operating range and applicability of remotely powered devices an electro-magnetic energy harvester is developed in a 0.13 μm low cost CMOS technology. The presented system converts RF power to DC power to supply wireless sensor nodes, active transmitters or related systems with a power consumption up to the mW range. The chip includes an ultra low power control unit and consumes only...
This paper presents a fully integrated capacitive DC/DC-converter with a gearbox type topology. By merging multiple topologies the output voltage range is increased. The dual loop digital control improves load regulation compared with a conventional hysteretic control and reduces ripple under low load operation. The converter was implemented in a 90 nm CMOS technology and measurements are presented.
The attenuation of supply noise is crucial in those sensor interface circuits that require the detection of the small signal capacitance. This paper presents an integrated charge-pump based continuous frequency regulator for precision supply voltage generation. The circuit is able to operate with external supply voltage ranging from 3.0 V to 5.5 V. The charge-pump generates a nominal voltage of 3...
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