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This report studies the influence of printed circuit board (PCB) design on voltage overshoot and ringing oscillation in switching operation of gallium nitride gate injection transistor (GaN-GIT) for high-frequency DC-DC converter. The parasitic inductances in the main power loop have been identified based on moment of method (MoM) analysis and frequency characteristics of impedance measured with 2-port...
A 650 V three-phase IGBT motor driver is presented in this article. Apart from the power transistors and predrivers, also freewheeling diodes are present in the output power stage to drive inductive loads. The 15 V overdrive voltage as well as all other floating supplies are generated on-chip by means of a charge pump and cascoded current mirrors. The input signals for all switches are at ground level...
Together with the increasingly demanding DAC, the design of the comparator introduces a big challenge for the implementation of high resolution SAR ADCs. Therefore, several state of the art works investigated improved comparator architectures aiming for higher resolution. However, those architectures in most cases resulted either in excessive power consumption or compromised conversion speed. For...
In this paper, a systematic design methodology is proposed to design a triangular wave generator circuit. Using this methodology, various oscillation frequencies can be obtained in a shorter design time. Furthermore, the variations in the oscillation frequency are controlled across all process corners. The proposed methodology employs a transistor sizing and biasing CAD tool called CHAMS, in which...
This paper presents a fully integrated 60 GHz power amplifier in 40nm CMOS that reaches the highest reported product of power-added efficiency and bandwidth. It is achieved through low/moderate coupling-factor transformers in the preliminary stages and a proper second harmonic termination of the output stage, such that it can operate as a class-E/F2 switched-mode PA at the saturation point. The three-stage...
This paper proposes a new RF oscillator topology that is suitable for ultra-low voltage and power applications. By employing alternating current source transistors, the structure combines the benefits of low supply voltage operation of conventional NMOS cross-coupled oscillators together with high current efficiency of the complementary push-pull oscillators. In addition, the 1/f noise upconversion...
This work presents the co-design and simulation of a self-excited MEMS-CMOS oscillator. The device consists of an electrostatic MEMS actuator, a DC source and a resistive circuit switched by the actuator's displacement. The MEMS device is modeled after an existing device. A CMOS circuit is proposed for the displacement detection and the switching mechanism. The oscillator is capable of sustaining...
Current-controlled oscillators (CCO) for analog to digital conversion need linear tuning-characteristics. A new CCO design in which the period of oscillation is defined by charging the timing capacitor to a reference voltage by the input current, is described. The sources of non-linearity in the tuning characteristics are identified and modeled. A method of compensating for these errors is presented...
The paper presents the modes of operation of the static compensator (STATCOM) in the case of balancing the unbalanced load in three-wire and four-wire system. The attention is focused on the effect of these modes on the currents of semiconductor switches of the circuit and capacitors on the DC-side of the converter.
A series switched resonator based dual-band oscillator, employing single transistor, is reported. The oscillator employs a semiconductor diode, as switch, to change the resonator's effective length, thereby, controlling the oscillator's negative resistance to shift its output between two desired frequencies. Agilent's Advanced Design System (ADS) in conjunction with the electromagnetic simulation...
This paper reports experimental observations of injection-locking in a CMOS LC frequency divider with direct injection. Several factors are considered including the amplitude of the driving signal, the harmonic content of the driving signal, the switch size, and the forward body bias of the switch. The experiments are performed using a technique to determine rapidly the boundaries of the Arnold tongue...
The scaling of the CMOS technologies has a great impact on analog deign. The most severe consequence is a reduction of supply voltage. In this paper, sampled sinusoidal switched current oscillator (SSIO), which operates at 1.8 V supply voltage is discussed. The proposed circuit has the simpler configuration and hence fewer transistors and connections, and faster building up of the stable oscillation...
A new low offset and high speed latch comparator is presented. The proposed offset compensation technique enables the preamplifier design relaxation for high-speed and high-resolution analog-to-digital converters. In order to enhance the loop gain of offset cancellation feedback the latch negative resistance is used. The Monte-Carlo simulation results for the designed comparator in 0.18μm CMOS process...
In this paper, the fundamental principle of bipolar process-based current-controlled PWM switching power supply is presented. The advantages of current-controlled PWM switching power supply are pointed out, and the design, operational principle, and layout of major functional units of the circuit are briefly described. The operating frequency of the circuit is up to 1MHz. The current-controlled PWM...
A spread spectrum technique and apparatus for reducing electromagnetic interference (EMI) in class D amplifier are introduced. The technique utilizes very simple hardware, where the switching frequency of a class D amplifier is dynamically varied from 1 to 1.22 MHz. This is achieved by changing the charging current of an oscillator in a random fashion, through 6 switches that are controlled by 6 random...
This paper presents the design of a supply and process-insensitive 12-bit digital pulse width modulator (DPWM) for digital DC-DC converters. The DPWM is realized by a counter and a ring oscillator-multiplexer segmented tapped delay line. The ring oscillator of the tapped delay line is made insensitive to supply and process variation by biasing the differential delay cells with a supply-insensitive...
Ultra-wideband (UWB) technologies are at the forefront of wireless communications, offering the possibility to provide extremely high data rate wireless solutions. This paper works on the UWB variable signal generator that is capable of fast switching between different center frequencies. The target switching time is 4ns and the three center frequencies at the lower band are selected, which are 3...
Polymorphic gates can be considered as a new reconfigurable technology capable of integrating logic functions with sensing in a single compact structure. Polymorphic gates whose logic function can be controlled by the level of the power supply voltage (Vdd) represent a special class of polymorphic gates. A new polymorphic NAND/NOR gate controlled by Vdd is presented. This gate was fabricated and utilized...
A delay-locked loop of multi-band selector with wide-locking range and low power dissipation is presented. The architecture of the proposed delay-locked loop consists of phase frequency detector, charge pump, band selector, multi-control delay line, and start-up circuit. The multi-band selector is used to extend operation frequency of delay-locked loop by switching the multi-control delay line. The...
This paper presents an analytical modeling of ballistic and quasi-ballistic transport, implemented in Verilog-A environment and used for circuit simulation. Our model is based on the Lundstrompsilas approach and uses an expression of the backscattering coefficient given by the flux method. The model takes also into account short channel effects and tales into account the effects of different scattering...
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