The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 21, 2021
Filed:
Dec. 06, 2019
Chongqing Passion Chuangzhi Microelectronics Co., Ltd., Chongqing, CN;
Fang Tang, Chongqing, CN;
Chongqing Passion Chuangzhi Microelectronics Co., Ltd., Chongqing, CN;
Abstract
A blood oxygen detection chip with a capability of fast tracking light intensity. A photocurrent buffer receives light and generates an output photocurrent iph that is not affected by a leakage current as much as possible, a bandgap voltage reference and a linear voltage regulator are mainly used to obtain an accurate adjustable reference voltage Vref, an integrator integrates the photocurrent iph to obtain a voltage signal in a linear relation with a photocurrent value, a pulse generator converts the voltage signal to a frequency signal, and finally an output buffer performs wave shaping to obtain a final output frequency signal Freq in a linear relation with a light intensity value.