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Modular multilevel converters (MMC) have many advantages owing to their power-stage modularity. However, this modularity does not extend directly to the control. Particularly, the balancing control usually requires central coordination and increases in complexity with the system size. This paper presents a balancing control method for a more general modular multilevel converter with series and parallel...
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....
This paper presents a seven level inverter utilizing switched-capacitor technique. Proposed topology employs two asymmetric DC voltage sources as input and generates a multilevel staircase output. The structure includes a front-end switched-capacitor based DC-DC converter cascaded by a back-end H-bridge inverter. The frontend SC DC-DC converter feeds three DC voltage levels to the H-bridge inverter...
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...
In this paper, a 16-channel analog front-end (AFE) ECoG-signal acquisition circuit for closed-loop seizure control system is presented. It is composed of 16 auto-reset chopper-stabilized capacitive-coupled instrumentation amplifiers (AR-CSCCIA) with band-pass filters, 16 programmable transconductance-gain amplifiers, a multiplexer, a transimpedance amplifier, and a 10-bit SAR ADC. The low input-referred...
A magneto-optical (MO) spatial light modulator (SLM) with submicron pixel sizes that is driven by spin transfer switching (spin-SLM) has been proposed and developed for displaying 3D holographic movies with wide viewing zone [1].
In order to realize a massive MIMO concept, small size and low power consumption over the wide-band frequency range are challenges for RF frontends module. This paper describes a highly integrated RF frontend module for high SHF wide-band massive MIMO in 5G. The RF frontend module is designed with 0.15 µm GaAs process and assembled on 5 × 5 mm2 QFN package. By employing Doherty amplifier configuration...
This paper presents an analytical investigation of the three-phase single active bridge DC-DC converter. First, multiple operation modes have been identified, that can be distinguished by the shape of the phase currents. For every single operating mode, analytical equations have been derived in order to describe the currents of both input and output bridge. In this paper, two operating modes are selected...
The paper describes a high-voltage solid-state switch unit intended for use at output cascades of modulators of power vacuum microwave devices with grid control. The switch unit is composed of two identical high-voltage transistor switches constructed by stacking MOSFET transistor sections in series configuration. Both transistor switches are alternately driven on commands from a single control module...
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 comparative analysis of different DC-DC buck converter schemes, particularly for 1-cycle, 2-cycle and 3-cycle circuits. A mathematical model is developed; the external characteristics and the dependency of total harmonics distortion (THD) of input current and load voltage are plotted. Also, the circuit elements calculation is performed for 1-cycle, 2-cycle and 3-cycle converters.
This paper presents a 96.6-dB-peak-SNDR and 50-kHz-bandwidth switched-capacitor delta-sigma modulator for ADC operating at 1.8 V and consuming 7.9 mW. This performance is achieved by the introduction of Class-AB single-stage switched variable-mirror amplifiers (VMAs) combined with an optimized architecture and a 5-phase switched-capacitor scheme. The resulting 1.8-mm2 delta-sigma modulator is integrated...
This paper presents an algorithm for seeking the most suitable operating point and the maximum efficiency in respect of the operating conditions in a dual active bridge converter. The method is the most suitable for half-bridge variants of the dual active bridge since the previously presented modulation methods are derived only for full-bridge configurations. The maximum efficiency point tracking...
The paper describes the basic knowledge about the matrix converter two-step commutation method that was realized on our department. This commutation strategy was implemented in VHDL for FPGA and was simulated in Simulink/Modelsim (cosimulation). The new developed two-step commutation method is two-time faster than the formerly implemented four-step commutation method. But the cosimulation in MatLab...
This paper presents a control algorithm for the newly proposed diode-assisted buck-boost voltage-source inverters (VSIs), with high voltage gain, which takes into account the changing of the DC-link voltage (two leveled) during one switching period due to the parallel charging and series discharging of the capacitors in the diode-capacitor network Additionally it lowers the components voltage ratings.
A Class-S Power Amplifier architecture seems to be an attractive alternative for classical PAs due to offered very high efficiency operation. Switching mode PA principle assumes combined operation based on digital, single - bit Delta-Sigma (ΔΣ) modulated signals and RF analog signals, what complicates design and analysis procedures. However the Class-S PA topology is known, there are not any universal...
Efficiency of power amplifiers for the wireless infrastructure is presently a hot topic. Switch-mode type amplifiers and/or more complex concepts, e.g. Doherty or envelope tracking (ET) are being explored intensively, exploiting the potential of GaN technology. This paper contributes recent results on a related approach, the class-S concept, which offers also compatibility with digital baseband processing...
This work presents a radiofrequency digital-to-analog converter (RF-DAC) in 65 nm CMOS. The RF-DAC combines DAC and mixer functionality in a single building block. It is the basis for a `direct-digital' vector modulator used in reconfigurable broadband multistandard transmitters for mobile communications. After introducing the basic idea of the RF-DAC, an appropriate transmitter architecture is discussed...
The cut-off wavelengths of integrated silicon transistors have exceeded the die sizes of the chips being fabricated with them. Combined with the ability to integrate billions of transistors on the same die, this size-wavelength cross-over has produced a unique opportunity for a completely new class of holistic circuit design combining electromagnetics, device physics, circuits, and communication system...
This paper presents an inverter-based switched-capacitor integrator for 0.5 V low-voltage applications. The proposed integrator utilizing floating voltage source and forward body bias obtains high performance as well as good independence of variations in process and temperature. It is applied to a 0.5 V feedforward AD modulator. The test results indicate that the designed AD modulator achieves a peak...
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