Patent ID: 9671362
Date: 2017-06-06
CPC Classifications: B32B,C03C,G01N,H01L

Claim:
1. A pH sensor comprising: a substrate; an ion sensitive field effect transistor (ISFET) die including an ion sensing part that responds to pH, wherein the ISFET die is bonded to the substrate; wherein the ion sensing part of the ISFET die is configured to be exposed to a medium, and wherein the ion sensing part outputs a signal related to a pH level of the medium; and a plurality of strips of at least one composition of a bonding agent material disposed in a first pattern between the substrate and the ISFET die, wherein the plurality of strips induce a counteracting force in a direction that counteracts at least a portion of environmental forces on the ISFET die during thermal changes, and wherein the counteracting force is configured to maintain the change in piezoresistance of the ISFET die from a drain to a source to less than 0.5%.