Ricardo Madeira

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Quadrature oscillators obtained by superharmonic coupling are known for its good phase noise performance. By making use of the presence of a second harmonic in the common-mode node of an Class D LC oscillator it is possible to design a 2.4 GHz quadrature oscillator using an inverting on-chip transformer. Simulation results in a circuit prototype in 130 nm(More)
Switched capacitor (SC) DC-DC converters can be used to convert an input voltage range into a fixed output voltage value. The efficiency of these circuits depends on the ratio between the input and output voltages and on the parasitic capacitances of the circuit. Depending on the type of capacitor and how it is connected, the impact of the parasitic(More)
Decentralization of the delivery of public services provision is an important governance reform recently witnessed in many developing countries. Public education has been one of the key public services devolved to lower level governments. This paper uses an exclusive and rich longitudinal data on primary schools to evaluate the e¤ects of the(More)
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