Performance Analysis of Dynamic Threshold-Voltage CNTFET for High-Speed Multi-level Voltage Detector

Bari, Syed Mustafa Khelat; Biswas, Subrata; Arifuzzman, A K M; Ahmad, Habib; Hasan, Nawjif Md. Anamul

doi:10.1109/uksim.2012.98

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…High speed, on the other hand, is imperative to provide a means of quickly turning on/off the power switches at the instance when the current/voltage of the power switches become practically zero. Low speed would otherwise compromise the efficacy of the fully softswitching [61].…”

Section: Figure 13 Switching Losses In a Typical Hard-switching Led mentioning

confidence: 99%

“…Although a plethora of prior-art current sensors [62], voltage detectors [61] and level shifters [63] have been reported, they remain inadequate for three reasons. First, reported current sensors are often based on off-chip current-sensing by means of an external resistor, and dissipate relatively high power and occupy a relatively large PCB footprint [29], [64].…”

Section: Figure 13 Switching Losses In a Typical Hard-switching Led mentioning

confidence: 99%

“…First, reported current sensors are often based on off-chip current-sensing by means of an external resistor, and dissipate relatively high power and occupy a relatively large PCB footprint [29], [64]. Second, state-of-the-art voltage detectors typically embody voltage dividers and window comparators, and dissipate relatively large power and suffer from a narrow detecting range [61]. This narrow detecting range undesirably reduces the input voltage range of the LED driver.…”

Section: Figure 13 Switching Losses In a Typical Hard-switching Led mentioning

confidence: 99%

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Design and realization of high-performance LED drivers for automotive lighting applications

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This Ph.D. program pertains to the design and monolithic realization of Light Emitting Diode (LED) drivers for automotive lighting where the imperative parameters are high power-efficiency and high reliability. The grand objectives thereto are substantial improved specifications over the state-of-the-art, including power-efficiency, reliability, current driving capability, and dimming range. To achieve the said grand objectives, the specific objectives are to decouple, and hence mitigate the following two major design trade-offs that limit the performance of contemporary automotive LED drivers. The first trade-off is between high reliability and high current driving capability, and applies to both single-phase and multi-phase LED drivers. Specifically, to achieve high current driving capability, the contemporary single-phase LED driver typically suffers from low reliability arising from large current ripples. On the other hand, the multi-phase LED driver is highly advantageous to provide high current driving capability, but suffers from low reliability because of the ensuing subharmonic oscillation. To decouple this limiting trade-off, we propose the design and monolithic realization of a novel Pulse-Width-Modulation (PWM)-based dual-phase LED driver in Global Foundries (GF) 130nm BCDLite process. To achieve high current driving capability, we adopt a dual-phase power stage. To achieve high reliability, we propose an Average Current Control to eliminate the subharmonic oscillation by considering the complete inductor-current profile vis-à-vis peak current adopted/reported elsewhere. To further improve the reliability, we propose an accuracy-enhanced current sensor to ascertain good current balance in the adopted dual-phase power stage. With measurements on our prototype LED driver ICs embodying our aforesaid adoption and vi proposed circuits, we demonstrate, to the best of our knowledge, for the first time that the trade-off between high reliability and high current driving capability is decoupled, i.e., an LED driver uniquely featuring high reliability, yet high current driving capability. The second trade-off is between high power-efficiency and wide dimming range. Specifically, a wide dimming range is derived by means of high switching frequency, hence the ensuing reduced settling time of the LED current. This, however, in turn leads to a degradation of the power-efficiency due to increased switching losses. To decouple this limiting trade-off, we propose the design and monolithic realization of a novel fully soft-switched LED driver in GF 130nm BCDLite process. We achieve wide dimming range by operating at high switching frequencies, but the high switching does not compromise the power-efficiency. Using a fully soft-switching approach, the ensuing switching losses are negligible. This is achieved by a proposed Hysteretic Soft-Switching Controller (HSSC) and proposed circuitries, i.e., a voltage detector, current sensor, and a level shifter. The HSSC enables complete soft-switching, including zerovoltage switc...

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Section: Figure 13 Switching Losses In a Typical Hard-switching Led mentioning

confidence: 99%

Section: Figure 13 Switching Losses In a Typical Hard-switching Led mentioning

confidence: 99%

Section: Figure 13 Switching Losses In a Typical Hard-switching Led mentioning

confidence: 99%

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Design and realization of high-performance LED drivers for automotive lighting applications

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Design and performance evaluation of a low transistor ternary CNTFET SRAM cell

Srinivasan

Bhat

Murotiya

et al. 2015

2015 International Conference on Electronic Design, Computer Networks &Amp; Automated Verification (EDCAV)

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CNTFET Technology-based adjustable Hysteresis Schmitt Trigger circuit for Energy-Efficient application

Varmazabadi

Parhizgar

Abiri

et al. 2022

2022 30th International Conference on Electrical Engineering (ICEE)

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Performance Analysis of Dynamic Threshold-Voltage CNTFET for High-Speed Multi-level Voltage Detector

Cited by 4 publications

References 18 publications

Design and realization of high-performance LED drivers for automotive lighting applications

Design and realization of high-performance LED drivers for automotive lighting applications

Design and performance evaluation of a low transistor ternary CNTFET SRAM cell

CNTFET Technology-based adjustable Hysteresis Schmitt Trigger circuit for Energy-Efficient application

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