Çѱ¹Á¤º¸Åë½ÅÇÐȸ ³í¹®Áö (Journal of the Korea Institute of Information and Communication Engineering)
Current Result Document : 5 / 6
ÇѱÛÁ¦¸ñ(Korean Title) |
Intra Oral CMOS X-ray Image Sensor¿ë DC-DC º¯È¯±â ¼³°è |
¿µ¹®Á¦¸ñ(English Title) |
Design of a DC-DC converter for intra-oral CMOS X-ray image sensors |
ÀúÀÚ(Author) |
ÀåÁöÇý
±è·Á¿¬
Ç㼺±Ù
Jari Pekka Josonen
±èÅ¿ì
ÇÏÆǺÀ
±è¿µÈñ
Ji-Hye Jang
Jinliyan
Subg-Kyn Heo
Jari Pekka Josonen
Tae-Woo Kim
Pan-Bong Ha
Young-Hee Kim
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¿ø¹®¼ö·Ïó(Citation) |
VOL 16 NO. 10 PP. 2237 ~ 2246 (2012. 10) |
Çѱ۳»¿ë (Korean Abstract) |
º» ³í¹®¿¡¼´Â ±¸°¼¾¼¸¦ ¼ÒÇüÈÇÏ°í Á¦Á¶ ¿ø°¡¸¦ ³·Ãß±â À§ÇØ ±¸°¼¾¼¿¡¼ ÇÊ¿ä·Î ÇÏ´Â ¹ÙÀ̾ ȸ·Î¸¦ ±¸°¼¾¼ Ĩ ³»ºÎ¿¡¼ ¸¸µé¾îÁÖ¾ú´Ù. Á¦¾ÈµÈ DC-DC º¯È¯±â ȸ·Î´Â ±âÁØÀü·ù ¹ß»ý±â(reference current generator) ȸ·ÎÀÇ IREF¸¦ ÀÌ¿ëÇÏ¿© Àü¾Ð ·¹±Ö·¹ÀÌÅÍ(voltage regulator)¿¡ ÇÊ¿äÇÑ ±âÁØÀü·ù¿Í ¹ÙÀ̾ Àü·ù¸¦ °¢°¢ °ø±ÞÇØÁØ´Ù. À̵é Àü·ù°¡ °¢°¢ÀÇ Àü¾Ð ·¹±Ö·¹ÀÌ È¸·Î¿¡¼ ÇØ´çµÇ´Â ±âÁØÀü¾ÐÀ» »ý¼ºÇÏ¿© ºÎ±Ëȯ(negative feedback)¿¡ ÀÇÇØ ¸ñÇ¥Àü¾ÐÀ» regulationÇÏ°Ô µÈ´Ù. ±×¸®°í ±âÁØÀü·ù°¡ Àü·ù º¹»çºñ(current mirror ratio)¿¡ ÀÇÇØ mirroringµÇ¾î Á¤Àü·ùÀÎ IB0/IB1À» °ø±ÞÇØÁÖ°í, VREF Àü¾ÐÀ» °ø±ÞÇØÁÖµµ·Ï ¼³°èÇÏ¿´´Ù. 0.18§ X-ray CMOS À̹ÌÁö ¼¾¼ °øÁ¤À» ÀÌ¿ëÇÏ¿© ¼³°èµÈ ±¸°¼¾¼ÀÇ DC-DC º¯È¯±âÀÇ Ãâ·Â Àü¾ÐÀÇ Æò±Õ Àü¾Ð, ¥ò¿Í 4¥ò´Â ¾çÈ£ÇÑ ÃøÁ¤ °á°ú¸¦ ¾ò¾ú´Ù. ±×¸®°í line-pair pattern ¿µ»óÀº blurring ¾øÀÌ ³ôÀº ÇØ»óµµ Æ¯¼ºÀ» º¸¿´À¸¸ç, ÁÁÀº ±¸° ¿µ»óÀ» ȹµæÇÏ¿´´Ù.
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¿µ¹®³»¿ë (English Abstract) |
A bias circuit required for an oral sensor is manufactured inside the oral sensor chip to reduce its size and cost. The proposed DC-DC converter supplies the required reference and bias currents for their corresponding regulators by using IREF of the reference current generator. Their target voltages of the voltage regulators are regulated by the negative mechanism by generating their reference voltages required for their corresponding regulators. In addition, a constant current IB0/IB1 is supplied by being mirrored by a current mirror ratio and then VREF is generated. It is confirmed by measurements that the average volatge, ¥ò, and 4¥ò of the designed DC-DC converter for intra oral sensors with a 0.18§ X-ray CMOS process are within their required ranges. And the line-pair pattern image shows a high-resolution characteristic without blurring. Also, a good oral image can be obtained.
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Å°¿öµå(Keyword) |
CMOS ¿¢½º·¹ÀÌ À̹ÌÁö ¼¾¼
±¸°
Á÷·ù-Á÷·ù º¯È¯±â
±âÁØ Àü·ù ¹ß»ý±â
CMOS X-ray image sensor
intra-oral
DC-DC converter
reference current generator
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ÆÄÀÏ÷ºÎ |
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