Results 221 to 230 of about 629,535 (260)
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Curvature sensing and compensation: a new concept in adaptive optics
Applied Optics, 1988Mesure et compensation, en temps reel, de fronts d'onde soumis a une perturbation atmospherique.
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Hysteresis compensation technique for POF curvature sensors
SPIE Proceedings, 2017Polymer optical fibers (POF) have higher strain limits, fracture toughness and flexibility in bend if compared to glass optical fibers. These characteristics enable the application of POFs as curvature sensors. However, the polymer is a viscoelastic material, which does not have a constant response with stress or strain.
Arnaldo G. Leal +2 more
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Optimal curvature-compensated BiCMOS bandgap reference
ISPA 2001. Proceedings of the 2nd International Symposium on Image and Signal Processing and Analysis. In conjunction with 23rd International Conference on Information Technology Interfaces (IEEE Cat. No.01EX480), 2002A bandgap voltage reference with a circuit providing compensation of the thermal nonlinearity for the base emitter voltage is described. The temperature dependence of V/sub BE/(T) is linearized using, as the bias current, a current which is proportional with the n-th degree of absolute temperature.
C. Popa, O. Mitrea
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A novel compensation method for the measurement of radius of curvature
Optics & Laser Technology, 2011Abstract A test method for spherical mirrors with super-long radius of curvature that only one compensator is employed to measure the radii of curvature of both concave and convex mirrors is presented. With this testing system, the surface figure and radius of curvature of spherical mirrors can be measured simultaneously. Using the ABCD matrix method,
Hengyu Yi +5 more
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Aberration compensation for objective phase curvature in phase holographic microscopy
Optics Letters, 2012In this study, we proposed a simple and fast numerical approach to compensate for aberrations induced by objective phase curvature. This method is based on the extraction of virtual background phase from reconstructed phase values using a line profile, followed by subtraction of the virtual background phase from the reconstructed phase image.
Kyeong Won Seo +3 more
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A WIDE SUPPLY RANGE BANDGAP VOLTAGE REFERENCE WITH CURVATURE COMPENSATION
Journal of Circuits, Systems and Computers, 2013For the requirement of power management controller chips, a wide supply range bandgap voltage reference circuit is presented. The preregulated circuit based on the regulation characteristic of zener diode extends the supply range and increases power supply rejection ratio (PSRR). Compensated by the base-emitter voltage (V BE ) linearization technique,
L. F. Shi +4 more
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An improved voltage bandgap reference with high-order curvature compensation
2015 IEEE 11th International Conference on ASIC (ASICON), 2015This paper presents an improved bandgap reference (BGR) with high-order curvature compensation. By adding a second-level operational tranconductance amplifier (OTA) with feedback, fully improve the correctness of hypothesises in paper [3]. In addition, the output voltage reference can be further compensated than the conventional high-order BGR from ...
Nan Lyu, Ning Mei Yu, Min Yi
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A Curvature Compensated Bandgap Circuit Exploiting Temperature Dependence of β
2019 IEEE 62nd International Midwest Symposium on Circuits and Systems (MWSCAS), 2019This paper proposes a technique for the curvature compensation in Bandgap references to obtain a better Temperature Coefficient (TC). The proposed method is based on the fact that the Bipolar junction transistors used in Bandgap references have finite Beta which is temperature dependent.
Radha Krishna Mothukuru +2 more
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IEEE Transactions on Circuits and Systems II: Express Briefs, 2021
Wenju Liu, Xifeng Liu, Shan Liang
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Wenju Liu, Xifeng Liu, Shan Liang
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A 1-V 2.69-Ppm/°C 0.8-μW Bandgap Reference With Piecewise Exponential Curvature Compensation
Microelectronics Journal, 2022Zihao Jiao, Hongrui Luo, Yuwei Wang
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