US 12,149,047 B2
Pulse width check circuit for laser diode pulse generator
Marco Zamprogno, Cesano Maderno (IT); and Alireza Tajfar, Milan (IT)
Assigned to STMicroelectronics S.r.l., Agrate Brianza (IT)
Filed by STMicroelectronics S.r.l., Agrate Brianza (IT)
Filed on Jun. 6, 2022, as Appl. No. 17/833,604.
Application 17/833,604 is a division of application No. 16/455,063, filed on Jun. 27, 2019, granted, now 11,387,625.
Prior Publication US 2022/0302676 A1, Sep. 22, 2022
Int. Cl. H01S 5/042 (2006.01); G02B 26/08 (2006.01); G02B 26/10 (2006.01); H01S 5/062 (2006.01); H03K 5/26 (2006.01); H05B 45/30 (2020.01); H05B 45/325 (2020.01)
CPC H01S 5/0428 (2013.01) [G02B 26/0816 (2013.01); G02B 26/10 (2013.01); H01S 5/062 (2013.01); H03K 5/26 (2013.01); H05B 45/30 (2020.01); H05B 45/325 (2020.01)] 21 Claims
OG exemplary drawing
 
1. A pulse width detector, comprising:
a first current source coupled to a first node;
a second current source coupled to a second node;
a first switch selectively coupling the first node to the second node in response to a pulsed signal having a pulse width configured to be equal to a given fraction of a pulse width of a reference clock; and
a comparison circuit coupled to the first node and configured to determine whether a total current output by the first current source during a plurality of pulses of the reference clock exceeds a total current output by the second current source during a plurality of pulses of the pulsed signal equal in number to the plurality of pulses of the reference clock.