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RISS 인기검색어
- 검색키워드
- 저자 : Hiroo Wakaumi (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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A Three-Stage CMOS OP Amplifier with a Dynamic Switching Bias Circuit
Hiroo Wakaumi 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
This paper presents a high-speed CMOS OP Amp with a dynamic switching bias circuit capable of processing video signals of over 2 MHz with slight nonlinearity and low dissipated power. The OP Amp, capable of operating at 10 MHz dynamic switching rate, was designed and showed through simulations a dissipated power of 60 % of that in conventional continuous operation. A switched capacitor (SC) non-inverting amplifier with a gain of 2 employing this OP Amp and its high-speed 10 MHz dynamic switching operation, capable of processing video signals, was demonstrated. By increasing the switching duty ratio to 70 %, its power dissipation decreased to 62 % of that in normal operation. The output voltage inaccuracy for a SC amplifier with a gain of below 2 was below 1 % and mainly caused by the static nonlinearity of the OP Amp. This circuit configuration should be very useful in realizing low-power wide-band signal processing ICs.
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A High-Speed Six-Line Ternary Barcode Detection System with a Dual Threshold Method
Hiroo Wakaumi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A six-line ternary barcode detection system employing a dual threshold detection method has been developed to investigate the possibility of realizing multi-line scanners. This system, characterizing the subtraction of an attenuated enveloped line of a detected barcode signal from the original signal, enables detection over a larger range and also at higher scanning speeds while containing a great amount of information. The system using a six-line ternary barcode and a six-mirror-facet raster scanner was demonstrated to be capable of providing detection in a wide detection range of over 3.5 cm at a scanning speed of 417 scan/sec, over eight times that of conventional CCD cameras. The allowable skew angle for detection of barcode was over -16~+16 degrees, which are nearly equivalent to that in the conventional two-dimensional barcode detection system. The possibility of high-speed detection with a sufficient detection range determined by the raster scanner configuration and a practically usable large allowable skew angle for barcode detection was confirmed even when the scanning lines were increased. This system is expected to enable the real time identification of goods on production lines and in automated warehouses etc.
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A High-Resolution Laser Beam Collimator System for a High-Density Ternary Barcode Detection System
Hiroo Wakaumi 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
A laser beam collimator system with a high numerical aperture lens and a 1.2 mm aperture masked collimator is proposed to realize a miniature high-resolution ternary barcode detection system in which high-density ternary barcodes can be detected. It was clarified that a 1.2 mm aperture mask combined with a 0.5 NA lens is suitable for maintaining the laser beam width at less than 150 μm over a wide range of more than 4.5 cm. The laser head with this collimator system was applied to a ternary barcode detection system. It was confirmed that the detection system could detect the ternary barcode with a minimum bar width of 0.2 mm over a practical detection range greater than 5 cm (which conventional detection systems could not detect) by optimizing the clamp bias voltage in the clamping circuit to-0.8 V, and the gray bar concentration to 58 %. This collimator system has potential applications in high-speed, high-resolution ternary or binary barcode detection systems.
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