High Efficiency LED Driver Circuit Design for PPG Sensors-PPG 센서를 위한 고효율 LED 드라이버 회로 설계-Lim Seong-won's Engineering master's􀀃degree thesis Aju􀀃University􀀃College􀀃of􀀃Engineering-South Korea

High Efficiency LED Driver Circuit Design for PPG Sensors-PPG 센서를 위한 고효율 LED 드라이버 회로 설계-Lim Seong-won's

 Engineering master's􀀃degree thesis Aju University􀀃College􀀃of􀀃Engineering-South Korea

 ABSTRACT This paper presents a wide operating range, fast settling, and accurate current sourcing LED driver for PPG (Photoplethysmography) sensors application. Proposed NMOS resistor array and RC-time constant based calibration circuit precisely controls target LED driving current with less than 0.5% error over process variations. For the fast settling of pulse-width modulation(PWM) based boost converter loop, pulse-width predictor technique is proposed and greatly improves the settling time. Also, the proposed LED driver circuit is designed to enable duty cycle operation of LEDs to improve power efficiency. The proposed LED driver circuit is designed in 180nm CMOS process, supporting green/red /infrared LED driving voltage, 0.1%~100% duty-cycling and 1mA~100mA driving current.

ORIGINAL LINK:

 https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=3539d7e18ea94ea4ffe0bdc3ef48d419&keyword=DRIVER%20LEDS

The original thesis is in Korean, so I translated it into English using an artificial intelligence tool. Naturally, this translation is not one hundred percent accurate, so it should be analyzed in detail. I hope it proves helpful for your studies. 

THE LINK TO THE TRANSLATED THESIS IS:

https://www.mediafire.com/file/tofub4vb2irxoxp/High+Efficiency+LED+Driver+Circuit+Design+for+PPG+Sensors-DUAL.pdf/file

ALTERNATIVE LINK;

https://www.mediafire.com/file/2dz2goeitb5soxb/High+Efficiency+LED+Driver+Circuit+Design+for+PPG+Sensors-DUAL.pdf/file