Title:
CONVERSION CIRCUIT, HEARTBEAT CURRENT SIGNAL CONVERSION DEVICE AND METHOD, AND HEARTBEAT DETECTION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2017/166463
Kind Code:
A1
Abstract:
A heartbeat current signal conversion device, comprising a converter for converting a modulated optical signal into a current signal and transmitting same; a mixer for performing frequency conversion of a heartbeat current signal and a background photocurrent signal in the current signal, and then transmitting the modulated photocurrent signal, the frequency-converted heartbeat current signal and the frequency-converted background photocurrent signal in the current signal; a fully differential integrator for performing both positive integration and inverse integration on the modulated photocurrent signal, the frequency-converted heartbeat current signal and the frequency-converted background photocurrent signal, which are inputted, and then outputting a voltage signal. The fully differential integrator can improve the suppression of the heartbeat current signal conversion device to the common mode noise, and the linearity and the dynamic output range of the circuit. Moreover, the heartbeat current signal conversion device loop always forms a closed loop, and thus a direct output to the next-stage circuit can be achieved, eliminating an output buffer circuit, thereby reducing power consumption.
Inventors:
ZHANG MENGWEN (CN)
Application Number:
PCT/CN2016/087620
Publication Date:
October 05, 2017
Filing Date:
June 29, 2016
Export Citation:
Assignee:
SHENZHEN GOODIX TECH CO LTD (CN)
International Classes:
H03D7/16
Foreign References:
| US20040189363A1 | 2004-09-30 | |||
| CN101589549A | 2009-11-25 | |||
| CN2868185Y | 2007-02-14 | |||
| CN102973259A | 2013-03-20 |
Attorney, Agent or Firm:
LONGSUN LEAD IP LTD. (CN)
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