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Reliable power supplies are indispensable for the control component of high voltage direct current switches. But power cannot be directly acquired from the high voltage side of the grid. Wireless power transmission is a practicable solution of supplying power. The efficiency of wireless power transmission system is directly influenced by the efficiency of the power supply. A power supply used on wireless...
This work presents a wideband digital PA topology implemented in Gallium Nitride MMIC for a direct-digital RF transmitter. The topology employs a differential current mode driver and GaN inverter stage with active pull-up to drive an efficient switch-mode PA. By applying digital circuit design techniques in GaN, our approach enables wide-band digital drive of a switched-mode PA through pulse-width...
In the applications like aerospace, it is very important to drive the motor with high precision and high efficiency. The traditional switching inverter drives output pulse mode voltage which results in lots of harmonics and influences the stability of motor drives. A multilevel-switching-linear hybrid (MSLH) scheme is proposed in the paper for the permanent magnet synchronous motor (PMSM) drives....
Sigma-delta modulation is a method of constructing the radio frequency linear power amplifier with the using non-linear components. It can significantly simplify the structure of the power amplification path, which in this case shall operate as one-bit DACs. The preliminary modeling of potential different variants of the output stage in classes E, F, D (voltage switching and current switching) and...
This paper presents the design insights for the implementation of a monolithic radio frequency (RF) Class-E power amplifier for WLAN applications. The proposed high efficiency monolithic CMOS class-E power amplifier showcases the effective RF performance enhancement which is composed of two-stage structure and adopts a differential cascode topology with self-biased technique. The differential stage...
The design and simulation of a Class-E power amplifier with an Inverse Class-B driver are presented. The Inverse Class-B amplifier generates a train of half sinusoids which provides a compromise between using a sine wave and a square wave as the input waveform. The design methodology proposed includes the use of load-pull technique to determine the optimum fundamental-frequency load-impedance of the...
Wireless power transfer (WPT) consists of three major parts namely transmitter, medium and receiver. In WPT system, input power is fed to the source where it transmits and propagates via coils and delivered to the load side. For an efficient operation of the WPT system, it is important to have a good power efficiency mechanism from the input to the transmitter coil. In this paper, a simulated design...
The paper presents the evaluation of efficiency of class DE power amplifiers (PA) utilizing either series or parallel compensation inductance and operating in the frequency band. Because of substantial dependence of PA mode from operating frequency and load resistance, incomplete recharge of output capacities in transistors occur at high frequencies thus reducing its efficiency. If the problem is...
A fully integrated high efficiency 10-GHz class-E power amplifier prototype is demonstrated in CMOS 90-nm technology. It reaches an output power of 11.7 dBm, an output 1-dB compression point of 10.32 dBm, and a power-added-efficiency of 40.36% with a supply voltage of 1.5 V. A multiple-output DC-DC converter is proposed to provide several different regulated voltages to the power amplifier to optimize...
This article presents a new class of hybrid converters named Switched-Linear (SL) Converters that can operate as a DC-DC, DC-AC or AC-DC converter. The idea is originated from conventional linear power amplifier integrated with a switched power converter. The linear power unit/cell is a power amplifier, which is fed by two tracking power supplies to boost the efficiency of the linear unit without...
This paper presents that the maximum operating frequency of sub-harmonic Class-E amplifier not only depends on the transistor duty ratio, but also relies on the slope of switch voltage when the transistor turns on. When dc supply voltage, output power and shunt capacitance are specified, the maximum operating frequency increases as the slope of switch voltage increases. On the contrary, it increases...
A 2.4GHz stacked CMOS power amplifier (PA) with mode switching scheme is proposed to improve back-off efficiency in WLAN applications. The mode switching scheme effectively improves the PAE by 100% at 5dB back-off power by dynamically tuning the PA bias and optimal load with a power detecting controller. With the transistor-stacking and self-biasing techniques and powered by a 5.6V supply, the PA...
A low-cost silicon-based high efficiency CMOS-LDMOS switch-mode power amplifier (SMPA) line-up operating for sub-1GHz application is presented. The switch-mode operated LDMOS device is driven by high-speed, high voltage driver, implemented in a standard 0.14µm CMOS process technology. The CMOS driver uses high voltage extended-drain devices and delivers a 5.0VPP output voltage swing up to 1GHz. The...
A high efficiency, and low total harmonic distortion (THD), Class B amplifier in combination with hysteretic controlled switch mode, tracking power supplies was designed as a current generator (CG) for testing protective relays in energy distribution systems.
Nowadays the characterization of RF devices under large signal is performed in TCAD by using computational load-pull (CLP) simulation technique. In this paper, we modified the CLP simulation technique further to study the switching response of RF-LDMOS transistor for high efficiency switching power amplifier (e.g. class-F). In class-F PA operation, we achieved 85 % power added efficiency (PAE) together...
This paper presents a 8-bit RFDAC for quadrature transmitter by 130nm CMOS process, targeted for medical body area network application as per recently released IEEE 802.15.6 standard. Circuit architecture and design considerations are briefly introduced. To achieve output power range over 20dB, gain control by two voltage biases is adopted. Compared with the gain control by single voltage bias, this...
Acoustic microscope systems are high frequency, focused, micro-scanning and expensive. Whilst the performance demands on the transducer and lens is high new materials and machining technologies are enabling high frequency transducers to be more easily realized. A factor limiting use of microscope systems is the slow frame rate due to the micro-scanning needs. New transducer concepts reduce these needs...
The importance of the bandpass reconstruction filter, BPF, in the proper operation of carrier-burst transmitters is widely accepted. However, it is often analyzed as if it could be considered isolated from the other system's components. To fill this gap, this paper presents a detailed study of the carrier-burst transmitter BPF, addressing both its most significant characteristics and its influence...
This paper presents a T/R (transmit/receive) module for X-Band phased arrays using a 0.25 μm SiGe BiCMOS process technology. The T/R module consists of a T/R switch, a SPDT switch, a power amplifier (PA), and a low noise amplifier (LNA). The T/R switch and SPDT switch are implemented using CMOS transistors whereas the PA and LNA are based on SiGe HBTs. The designed T/R switch achieves minimum 3.2...
A modular hybrid switching amplifier (HSA) for wide-bandwidth supply modulation of RF power amplifiers is presented. The HSA is designed for maximum 15 V supply voltage, 1 A supply current and 10 MHz bandwidth. The purpose is to compare alternative switch technologies. A case study is conducted on GaN-HEMT and Si-MOSFET, which are compared with regards to efficiency and linearity under different load...
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