Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 35 for “"Cascode"”.
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High power wide bandgap cascode switching circuits
… undesirable gate drive characteristics. The cascode circuit has been suggested as a solution to this problem: WBG cascodes improve the switching speed, gate characteristics and noise immunity of devices, at the expense of greater on-state resistance. WBG cascodes have not, however, been …
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Characterization and Failure Mode Analysis of Cascode GaN HEMT
… and loss mechanism analysis are made. The cascode GaN HEMT has high turn-on loss due to the body diode reverse recovery of the low voltage Si MOSFET and the common source inductance (CSI) of the package; while the turn-off loss is extremely small attributing to the cascode structure. With …
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Surge-energy and Overvoltage Robustness of Cascode GaN Power Transistors
… study into the surge-energy robustness of the cascode GaN HEMT, a composite device made of a GaN HEMT and a Si metal-oxide-semiconductor field-effect-transistor (MOSFET), is still lacking. This work fills this gap by investigating the failure and degradation of 650-V-rated cascode GaN HEMTs in …
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A clamped folded cascode amplifier for analog-to-digital converter applications
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Experimental Evaluation of Medium-Voltage Cascode Gallium Nitride (GaN) Devices for Bidirectional DC–DC Converters
… are not well defined, especially in a cascode configuration. Additional research with further detailed investigation and analysis is necessitated for medium-voltage GaN devices in power converter applications. Therefore, the objective of this research is to experimentally investigate …
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CMOS/Bipolar current conveyor design and development
… that the best type of mirror was the regulated cascode current mirror which offered the largest value of output impedance when built from CMOS transistors. Work then moved onto the voltage follower. By initially using a typical CMOS source follower, it was found that the voltage gain suffered …
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High efficiency switching CMOS power amplifiers for wireless communications
… In addition, to improve efficiency of cascode class-E CMOS PAs, a charging acceleration technique is developed. The method accelerates a charging speed to turn off the common-gate device in the off-state, thus reducing the power loss. To demonstrate the proposed cascode class-E PA, a …
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Characterization and Application of Wide-Band-Gap Devices for High Frequency Power Conversion
… power conversion. The switching performance of cascode GaN HEMT is studied at first. An accurate behavior-level simulation model is developed with comprehensive consideration of the impacts of parasitics. Then based on the simulation model, detailed loss breakdown and loss mechanism analysis are …
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Robustness and Stability of Gallium Nitride Transistors in Dynamic Power Switching
… devices, the standalone GaN HEMT, and the GaN-Si cascode HEMT, are studied. The dissertation's first half discusses the GaN HEMT behavior outside of SOA, with a focus on the robustness of GaN HEMTs in overvoltage power switching. This focus is motivated by the lack of avalanche capability of GaN …
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High Gain Low Power Operational Amplifier Design and Compensation Techniques
… is proposed. This op amp uses composite cascode connections for the differential input stage, a common source second stage, and a current mirror. A prototype of the op amp was fabricated in a 0.25 µm CMOS process. The proposed op amp produces an open loop gain above one million with low …
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Radio frequency digital to analog converter
… output impedance to be achieved without an extra cascode transistor. Elimination of the cascode reduces transistor headroom requirements and allows the DAC to be built with a 1.8V supply. The RF DAC prototype is targeted to GSM transmit specifications and implemented in 0.1 8ptm CMOS technology. …
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A low phase noise ring oscillator phase-locked loop for wireless applications
… differential voltage controlled oscillator with cascode current starved inverters to reduces current noise. A compact multi-modulus prescaler is presented, based on modified true single-phase clock flip-flops with integrated logic. A fully differential charge pump with switched-capacitor common …
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Study of chopper stabilization in single ended amplifiers
… gain configuration is designed using the folded cascode topology in 180 nm CMOS process. This design is verified for functionality by a thorough comparison with its non-stabilized counterpart. Simulation results, including the benefits obtained in terms of reduced flicker noise and an amplified …
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Trade-offs between performance and reliability of sub 100-nm RF-CMOS technologies
… devices. 2) Floating-body effects in a cascode core is studied. Cascode cores are demonstrated to achieve much larger reliability lifetimes than a single device. A variety of cascode topologies are studied to achieve the trade-o s between performance and reliability for high-power …
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Exploiting the bulk-driven approach in CMOS analogue amplifier design
… pairs, at the source followers, and at the cascode devices. For the input stage of differential pairs, this thesis proposes two new novel circuit design techniques. One of them utilises the concept of the replica-biased scheme in order to solve the non-linearity and latch-up issues, which …
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Three-dimensional magnetic field sensor in IBM 0.18μm CMOS technology
… demonstrates a higher sensitivity. A high gain cascode differential amplifier is integrated with the sensor to further amplify the magnetic signal.
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A low-power, high-bandwidth LDO voltage regulator with no external capacitor
… The regulator has two stages, the first a folded cascode amplifier and the second a large pass transistor acting as a common-source amplifier. To better explore the tradeoff between bandwidth and power supply rejection, transistor dimensions are modified to support three different bias current …
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Design of a Precision, Very Low 1/f Noise, Low Power, Rail-Rail I/O, Integrated Bi-CMOS Operational Amplifier
… stages are given; rail to rail input, folded cascode, Monticelli rail to rail output, and Miller compensation. Finally, amplifier transient, spectral, and noise results are presented and discussed.
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Design of micropower operational amplifiers
… The input stage of the design has the folded-cascode architecture that allows the input common-mode range down to negative supply voltage. The Class AB output stage swings rail-to-rail and has the ratio of maximum current to quiescent current greater than 100. The bias cell of the operational …
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High Voltage Analog Design in a Standard Digital CMOS Process
… stage. The amplifier also uses high voltage cascode devices to protect low-voltage devices that have been placed in critical matching areas to achieve a low input offset voltage of 500uV without the use of trim. A short to battery architecture is also discussed which uses a bulk-driven …
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