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Korea Electrical Products Safety Association
- Product Safety
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- no.6 s.162
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- pp.58-61
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- 2007
지난 호에는 컬러수상기의 구조, 전자빔의 원리 및 비월주사의 구조에 대해서 알아보았다. 이어서 이번호에는 TV수신용 안테나(antenna), 튜너(tuner) 등의 원리 및 구조에 대해서 알아보도록 하겠다.
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Yang, Jae-Ho;Kong, Young-June;Lee, Moon-Kyu
- Journal of the Korean Society for Precision Engineering
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- v.16 no.2 s.95
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- pp.39-49
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- 1999
This paper describes the development of a vision-aided position and orientation recognition system for automatically adjusting electronic tuners which control the waveform by rotating variable resisters. The position and orientation recognition system estimates the center and the angle of the tuner grooves so that the main controller may correct the difference from the ideal position and thereby manipulate the variable resisters automatically. In this paper a robust algorithm is suggested which estimates the center and the angle of the tuner grooves fast and precisly from the source image with lighting variance and video noise. In the algorithm morphological filtering, 8-chain coding, and invariant moments are sequentially used to figure out image segments concerned. The performance of the proposed system was evaluated using a set of real specimens. The results indicate the system works well enough to be used practically in real manufacturing lines. If the system adopts a high speed frame grabber which enables real time image processing, it can also be applied to positioning of robot manipulators as well as automated PCB adjusters.
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Ko, Seung-O;Seo, Hee-Teak;Park, Jong-Tae;Yu, Chong-Gun
- Journal of IKEEE
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- v.14 no.1
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- pp.65-74
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- 2010
The Digital TV(DTV) standard has ushered in a new era in TV broadcasting and raised a great demand for DTV tuners. There are many challenges in designing a DTV tuner, of which the most difficult part is the frequency synthesizer. This paper presents the design of a frequency synthesizer for DTV Tuners in a $0.18{\mu}m$ CMOS process. It satisfies the DTV(ATSC) frequency band(54~806MHz). A scheme is proposed to cover the full band using only one VCO. The VCO has been designed to operate at 1.6~3.6GHz band such that the LO pulling effect is minimized, and reliable broadband characteristics have been achieved by reducing the variations of VCO gain and frequency step. The simulation results show that the designed VCO has gains of 59~94MHz(${\pm}$17.7MHz/V,${\pm}$23%) and frequency steps of 26~42.5MHz(${\pm}$8.25MHz/V,${\pm}$24%), and a very wide tuning range of 76.9%. The designed frequency synthesizer has a phase noise of -106dBc/Hz at 100kHz offset, and the lock time is less than $10{\mu}$sec. It consumes 20~23mA from a 1.8V supply, and the chip size including PADs is 2.0mm${\times}$1.8mm.
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