A reconfigurable RF front-end using a tunable interstage matching network is designed in 0.25 μm CMOS technology. It consists of a wideband LNA, interstage matching network, a Gilbert-cell mixer, and reconfigurable QVCO. Tunability of the interstage matching can be obtained by a MOS varactor. It can change tuning frequency by controlling capacitance of varactor. Gain of the RF front-end can be ...

To efficiently supply wide-range DC voltage from a pulse-width modulation (PWM) rectifier, this paper presents a single-phase, full-wave, diode-bridge, single-ended primary-inductor converter-type (SEPIC-type) power-factor-correction (PFC) rectifier in continuous conduction mode with a sliding surface-regulated current-mode PWM controller. According to the switched-mode operation of the rectifi...

In this paper we present a study on the design optimization of voltage-controlled oscillators. The phase noise of LC-type oscillators is basically limited by the quality factor of inductors. It has been experimentally shown that higher-Q inductors can be achieved at higher frequencies while the oscillation frequency is limited by parasitic capacitances. In this paper, the minimum transistor siz...

This paper analyses two schemes of single-stage diode-switched active filters used in new switching power supplies designs to improve the power factor. From the point of view of the power flow, the distortion reduction is based on the improvement of the power conversion processes. Most of the ca/cc switching power supplies consists of two separated parts: a rectifier – in most cases a diode bri...

As the demand for fully integrated power management system has increased in recent years, the switched-capacitor (SC) converter has shown exceptional promise due to the favorable energy density of capacitors, but its limited output range and its intrinsic charge-sharing loss have limited its range of applications. In this paper, a resonant switched-capacitor (ResSC) topology is presented as a w...

This paper presents the designed and implemented CMOS Low Noise Amplifier (LNA) for multiband operation in TSMC 0.18 m process. To operate in multibands and multistandards, switched inductor and switched capacitor array are used in input and output signal paths. Due to filtering characteristic of input stage, the LNA can suppress spurious signal effectively. The designed reconfigurable LNA is t...

A high step-up DC-to-DC converter that integrates an isolated transformer and a switched-clamp capacitor is presented in this study. The voltage stress of the main power switch should be clamped to 1/4 V by using the turn ratio and switched-clamp capacitor of an isolated transformer to achieve a high voltage gain. In addition, a passive clamp circuit is employed reduce voltage stress on the mai...

The proposed fuel cell-based ultra-voltage gain boost converter offers an alternative to transformer-based topologies for achieving high voltage gain. While transformers can achieve gains, they come with drawbacks such as cost, design complexity, and increased weight. In this article, a switched inductor circuit is introduced solution This enhances overall system performance by reducing size, w...