US 12,350,026 B2
Photoplethysmography sensor and semiconductor device including the same
Sung Jin Jung, Hwaseong-si (KR); Long Yan, Hwaseong-si (KR); Seoung Jae Yoo, Seongnam-si (KR); and Yun-Cheol Han, Yongin-si (KR)
Assigned to Samsung Electronics Co., Ltd., Gyeonggi-do (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Mar. 4, 2021, as Appl. No. 17/192,418.
Claims priority of application No. 10-2020-0085492 (KR), filed on Jul. 10, 2020.
Prior Publication US 2022/0007953 A1, Jan. 13, 2022
Int. Cl. A61B 5/024 (2006.01); A61B 5/00 (2006.01)
CPC A61B 5/02427 (2013.01) [A61B 5/0004 (2013.01); A61B 5/02438 (2013.01); A61B 5/681 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A photoplethysmography sensor comprising:
a photoelectric conversion element including a cathode terminal and an anode terminal, the photoelectric conversion element configured to receive light reflected from a blood vessel and generate a current corresponding to the received light;
a current-to-voltage converter including a first input terminal and a second input terminal, the current-to-voltage converter configured to receive the generated current as a received current through the first input terminal and the second input terminal, and the current-to-voltage converter configured to generate an output voltage corresponding to the received current; and
a switch configured to connect the photoelectric conversion element to the current-to-voltage converter according to a control signal,
wherein in response to the control signal of a first level, the switch directly connects the cathode terminal of the photoelectric conversion element to the first input terminal of the current-to-voltage converter, and directly connects the anode terminal of the photoelectric conversion element to the second input terminal of the current-to-voltage converter, and
wherein in response to the control signal of a second level different from the first level, the switch directly connects the cathode terminal of the photoelectric conversion element to the second input terminal of the current-to-voltage converter, and directly connects the anode terminal of the photoelectric conversion element to the first input terminal of the current-to-voltage converter.