US 12,085,592 B2
Current peak sensor for pulsed laser diode array
Rahim Akbari-Dilmaghani, Graz (AT)
Assigned to ams AG, Premstaetten (AT)
Appl. No. 17/413,499
Filed by ams AG, Premstaetten (AT)
PCT Filed Dec. 6, 2019, PCT No. PCT/EP2019/084093
§ 371(c)(1), (2) Date Jun. 11, 2021,
PCT Pub. No. WO2020/126575, PCT Pub. Date Jun. 25, 2020.
Claims priority of provisional application 62/780,446, filed on Dec. 17, 2018.
Prior Publication US 2022/0074975 A1, Mar. 10, 2022
Int. Cl. G01R 19/04 (2006.01); G01R 19/25 (2006.01); G01S 7/48 (2006.01); G01S 7/4861 (2020.01); H01S 5/042 (2006.01); H01S 5/40 (2006.01)
CPC G01R 19/04 (2013.01) [G01R 19/2506 (2013.01); G01S 7/4804 (2013.01); G01S 7/4861 (2013.01); H01S 5/0428 (2013.01); H01S 5/4025 (2013.01)] 15 Claims
OG exemplary drawing
 
10. A method for current peak detection comprising:
generating, by a pulse laser diode array, a photocurrent (IPD), wherein the photocurrent generates an offset voltage across a sense resistor electrically coupled between the pulse laser diode array and a direct current (DC) input voltage source;
converting, by a capacitive voltage divider (CVD) electrically coupled to the pulse laser diode array, the offset voltage across the sense resistor to a scaled down voltage;
converting, by a rectifier circuit electrically coupled to the CVD, the scaled down voltage to a scaled down current;
rectifying, by the rectifier circuit, the scaled down current to a rectified current signal;
detecting, by a current peak detector circuit electrically coupled to the rectifier circuit, a peak level of the rectified current signal;
converting, by an analog-to-digital converter (ADC), the rectified current signal into a digital output signal; and
determining, by a digital signal processing (DSP) unit electrically coupled to the ADC, and based on the digital output signal, a peak current pulse at a top and a bottom of the sense resistor.