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A U-band oscillator is presented as a divide-by-two direct injection-locked frequency divider (ILFD), with NMOS injection transistors coupled to the LC oscillator. Compared with the both NMOS and PMOS injection transistors, the NMOS only injection transistors contribute to a much wider locking range. The strategy to choose the structure and sizes of the injection transistors for symmetry and the locking...
Topology of the multicell multilevel inverters are one of the most promising power converter topologies being successfully commercialized in the high-power market. This paper proposes a new cascaded multicell multilevel converter with a reduced count of power switches. The proposed reduced-switch-count multilevel is formed by connecting two distinct power conversion stages through two low-frequency...
A modified hybrid multilevel converter which is a combination of T-type converter and H-bridge is present in this paper. Beside increase output levels, another merit of this topology is larger output range compared with traditional two-level converter. Depending on the value of H-bridge floating capacitor voltage, the converter can produce 5-level, 7-level, or 9-level output voltage. The H-bridge...
This paper introduces a modified single-stage power factor correction (S2PFC) converter topology for high voltage, power and frequency (HVPF) applications which improves the power quality at utility AC side and at the load end. The modified proposed converter possess the ability of controlling the voltage and frequency independently and also simultaneously. The voltage can be controlled by PWM technique...
In this work, new design techniques that aim to reduce power consumption of true single-phase clock-based (TSPC) prescalers is presented. The structure of divide-by-4/5 frequency divider is simplified, and its performance is compared with previous work to demonstrate the improvement. Simulation results show at least a 25% reduction of power consumption is achieved by the proposed unit. In the 32/33...
This paper proposes a single-phase bidirectional buck-boost-inverter topology. The boosting function is achieved by using a wide range of duty cycles based on the front-end buck-boost converter characteristics. The two main switches operate at 20 kHz to generate a unipolar half-cycle sinusoidal waveform. The fundamental frequency switched full-bridge inverter block converts the unipolar output of...
Due to voltage limitation of available semiconductor switches, multicell converters are required for high-power medium-voltage applications. One of the most significant types of multicell converters is cascade multicell converter categorized into symmetrical and asymmetrical ones. This paper first presents a new symmetrical cascade multicell converter in which the number of switches is optimized....
This paper proposes a novel three-phase ac-ac converter topology based on Z-source concept. It could provide buck-boost function and make the role of frequency changer. Compared with the traditional ac-dc-ac converter, it uses fewer devices and realizes direct ac-ac power conversion, so as to have higher efficiency and better circuit characteristics. Compared with the traditional matrix converter,...
Multilevel converters are very interesting alternatives for medium and high power applications. This paper presents a new configuration of multicell converters. The main advantages of the proposed converter, in comparison with conventional Flying Capacitor Multicell (FCM) and Stacked Multicell (SM) converters, are doubling the number of output voltage levels and the RMS, improving the output voltage...
An n-level flying capacitor (FC) based active neutral point clamped (ANPC) converter is discussed in this paper. The converter is based on an arrangement of a three-level ANPC converter and a number of two-level cells creating an n-level line-to-neutral waveform. The converter is operated under a phase-shifted carrier pulse-width modulation (PWM). The mathematical model for the DC-link capacitors...
This paper discusses the design of a 60 GHz low noise amplifier (LNA) using a standard low power SOI CMOS process from ST Microelectronics. First, we outline the technology as well as the mm-wave design challenges. Using recent work on coplanar waveguide (CPW) modeling, we describe how it's possible to use parametric, 3D electromagnetic simulation to complete or replace analytical models of on-chip...
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