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TFT-LCD Source Driver 응용에 적합한 옵셋 저감회로
손종배(Jong Bae Son),손상희(Sang Hee Son),정원섭(Won Sup Chung),신희종(Hee-Jong Sin) 한국정보기술학회 2008 한국정보기술학회논문지 Vol.6 No.1
A dynamic offset cancellation method using simple high frequency modulation has been proposed, designed and verified with SPICE simulation. Proposed offset cancellation method can realized low offset compared to the conventional method. In the proposed method, two offset voltages of symmetrical differential amplifiers with same input signal can be modulated from DC to ㎒ frequency region compared to the ㎑ region in the conventional method. After the demodulation is performed through low pass filtering, the error voltage magnitude can be minimized to the level of sub ㎷. Also the output glitches normally associated with “hand-over” events by some switching operation can be attenuated by the proposed method. HSPICE simulation using 0.3-㎛ 18-V high voltage CMOS process parameters to verify the performance of proposed method is extensively performed and shows an input-referred offset variation of less than 1㎷ and hand-over glitches below 5㎷.
광전용적맥파(PPG) 측정용 CMOS 인터페이스 회로 설계에 관한 연구
이규식(Kyu-sik Lee),손상희(Sang-hee Son),정원섭(Won-sup Chung),신희종(Hee-jong Sin) 한국정보기술학회 2008 한국정보기술학회논문지 Vol.6 No.1
In this paper, a CMOS interface circuit for measuring PPG is proposed and designed by using current-control Schmitt trigger. This circuit detects the blood beat using PPG which occurs in blood beat sensor and composed of analog and digital parts. Current signal of sensor is converted into voltage in analog parts and then converted into digital signal in digital parts. Operation speed is increased and linear error is diminished by applying OTA to schmitt trigger circuit and oscillator. Also, proposed and designed circuit has some features of low power consumption, simple structure and high resolution compared.