A fast-response buck converter with load-current-extracted and AVDE techniques

Chen, Jiann‐Jong; Hwang, Yuh‐Shyan; Yeh, Yi‐Chen; Ku, Young

doi:10.1109/isne.2018.8394678

Cited by 1 publication

(4 citation statements)

References 6 publications

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“…The probe is realized by a lowly-doped n-type well surrounded by a grounded p-type well to ensure electric isolation from the substrate. The use of an n-well as the active sensing region is preferable to a p-well because it leads to higher current-related sensitivity SI according to [4] and [5]. The encapsulation of the n-type well in the p-type well is unavoidable in bulk technologies, and it generates a nonuniform depletion region surrounding the active region that: i) creates a parasitic capacitance effect, ii) introduces asymmetries in the sensor, since the thickness of the depletion region is proportional to the local bias potential.…”

Section: A Topological Aspects Of the X-hall Probementioning

confidence: 99%

“…In the X-Hall architecture, the active region is octagonally shaped (Fig. 1-b) and accessible by a total of 8 contacts: 4 large contacts (B, T, L, R) used to bias the probe, and 4 small contacts (1,2,3,4) used to sense the Hall voltage. In contrast to spun Hall sensor and due to the specific geometrical shape, the contacts of the X-Hall probe are dedicated to a single purpose (either biasing or sensing), so they can be optimized according to their specific function.…”

Section: A Topological Aspects Of the X-hall Probementioning

confidence: 99%

“…The X-Hall prototype is validated in two different case studies reproducing the requirements typical of power applications with fast events. The first case study targets the very fast change of the load current in a VFR DC-DC buck converter [4]. To this aim, the Keysight 81150A AFG is used to create two different square wave currents of 400 mApp with frequency of 100 kHz, duty cycle 20% and trail edges of 125 ns, in the first case, and frequency of 500 kHz, duty cycle 30% and trail edges of 50 ns, in the second case.…”

Section: Validationmentioning

confidence: 99%

“…M. Crescentini, G. P. Gibiino, A. Romani, M. Tartagni and P. A. Traverso are with the Department of Electrical, Electronic and Information Engineering (DEI) "G. Marconi", Bologna and Cesena Campuses, University of Bologna, power devices [1], [2], which are able to operate at high frequencies and high power rates, and by the emerging of very fast response (VFR) applications, such as dynamic voltage scaling in microprocessors [3], [4] and high-frequency AC inverters [5]. In VFR applications, the power converter must be able to change the output voltage in the microsecond scale and beyond, requiring voltage and current measurements with very fine time resolutions.…”

Section: Introductionmentioning

confidence: 99%

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The X-Hall Sensor: Toward Integrated Broadband Current Sensing

Crescentini

Ramilli

Gibiino

et al. 2021

IEEE Trans. Instrum. Meas.

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This paper presents the X-Hall sensor, a viable sensing architecture for implementing a silicon-integrated, broadband, current/magnetic sensor. The X-Hall sensor overcomes the bandwidth limit of the state-of-the-art Hall sensors by replacing the spinning-current technique with DC-biasedbased, passive offset compensation. In this way, the X-Hall architecture removes the methodological bandwidth limit due to the spinning-current technique and allows for exploiting the Hall probe up to its practical limit, which is set by the parasitic capacitive effects. Moreover, the X-Hall architecture allows to push the practical bandwidth limit at higher frequencies due to both the removal of the switches inherent in the spinning-current approach and a specifically designed analog front-end. To this end, a differential-difference current-feedback amplifier (DDCFA) is proposed as analog front-end in the X-Hall sensor. A prototype of the proposed X-Hall architecture is implemented in BCD 0.16-µm silicon technology to experimentally assess the performance of the X-Hall architecture. The passive offset compensation implemented into the X-Hall architecture is frequency independent and preserves an adequate offset reduction performance, though less efficient than the spinning-current technique operated at low frequency. Experimental dynamic tests on the prototype identify the presence of an additive parasitic dynamic perturbation due to the package that prevents from fully exploiting the X-Hall prototype up to its designed bandwidth limit. However, the implementation of a post de-emphasis digital filter allows to mitigate for the dynamic perturbation and to experimentally achieve a sensor bandwidth of 4 MHz, which is the broadest bandwidth ever demonstrated by a purely Hall-effect based sensor.

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Section: A Topological Aspects Of the X-hall Probementioning

confidence: 99%