US 12,283,950 B2
Common-mode transient suppression protection circuit for digital isolator
Qihui Chen, Suzhou (CN); and Yun Sheng, Suzhou (CN)
Assigned to SUZHOU NOVOSENSE MICROELECTRONICS CO., LTD., Suzhou (CN)
Appl. No. 17/926,617
Filed by SUZHOU NOVOSENSE MICROELECTRONICS CO., LTD., Suzhou (CN)
PCT Filed Oct. 23, 2020, PCT No. PCT/CN2020/123298
§ 371(c)(1), (2) Date Nov. 20, 2022,
PCT Pub. No. WO2021/232672, PCT Pub. Date Nov. 25, 2021.
Claims priority of application No. 202010431409.4 (CN), filed on May 20, 2020.
Prior Publication US 2023/0188136 A1, Jun. 15, 2023
Int. Cl. H04L 27/04 (2006.01); G05F 1/56 (2006.01); H03K 19/003 (2006.01); H04L 25/02 (2006.01); H03K 19/20 (2006.01)
CPC H03K 19/00315 (2013.01) [G05F 1/56 (2013.01); H04L 25/0268 (2013.01); H03K 19/20 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A common-mode transient suppression protection circuit for a digital isolator, comprising a modulation circuit, a demodulation circuit, and an isolation capacitor connected between the modulation circuit and the demodulation circuit,
wherein the modulation circuit comprises a modulation circuit front-end and a drive circuit, which are connected in sequence, a clamping module being arranged in the drive circuit; and the protection circuit further comprises a linear voltage regulator structure connected to the drive circuit, a power supply clamp being arranged in the linear voltage regulator structure, and
wherein the linear voltage regulator structure further comprises a linear voltage regulator and a voltage regulation follower, the linear voltage regulator is connected to a reference voltage, the voltage regulation follower and the power supply clamp are both connected to the linear voltage regulator, and the power supply clamp is connected to the drive circuit and provides an output voltage TX_VDD.