US 11,916,026 B2
High voltage supply clamp
Jongshick Ahn, San Diego, CA (US); Iulian Mirea, San Diego, CA (US); and Chung-Ti Hsu, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Aug. 7, 2019, as Appl. No. 16/535,012.
Claims priority of provisional application 62/719,032, filed on Aug. 16, 2018.
Prior Publication US 2020/0058603 A1, Feb. 20, 2020
Int. Cl. H01L 23/64 (2006.01)
CPC H01L 23/642 (2013.01) 35 Claims
OG exemplary drawing
 
1. A clamp, comprising:
first and second transistors coupled in series between a power bus and a ground;
a resistive voltage divider configured to bias a gate of the first transistor and a gate of the second transistor based on a supply voltage on the power bus; and
a capacitive voltage divider including a first capacitor coupled between the gate of the first transistor and the gate of the second transistor, and a second capacitor coupled between the gate of the second transistor and the ground, wherein the capacitive voltage divider is configured to turn on the first and second transistors in response to a voltage transient on the power bus exceeding a trigger threshold voltage,
wherein the clamp is coupled between the power bus and the ground, in parallel with a circuit that is supplied with power by the power bus.