Figure 1(b) shows the resistors are electrically connected in a Wheatstone bridge layout. When
pressure is applied to the silicon membrane of a pressure sensor, it deflects in the downward direction,
causing a change in the resistance values of the four piezoresistors. This in turn induces a change in the
output voltage of the Wheatstone bridge. The environment pressure can be derived using the output
voltage change of the pressure sensor. The current study considers the package of a p-type silicon
pressure sensor deposited in an n-type epilayer with a specific thickness grown on a p-type silicon
substrate. The square silicon membrane of the piezoresistive pressure sensor has an area of 576 × 576
μm and a thickness of 20 μm. It is designed for an absolute pressure range of 0-690 × 103 Pa with TCO
of 0.2% span/°C.