High Bias Design Problem A particular pressure sensor is designed to operate under constant pressure. The task is to detect a pressure increase and sound an alarm. The sensor produces 1 mV at 100 psi, its usual operating pressure, and increases by 1 mV per psi.

The design must sound an alarm if the pressure reaches 150 psi. The transducer is modeled as a voltage source with a series resistor that varies with pressure from 50 V at 100 psi to 150 V at 150 psi. Two types of OP AMPs are available. Type 1 are single-sided, meaning they have a þVCC of 5 Vand a VCC of 0V. Type 2 OPAMPs are double-sided with a VCC of 15Vand have a maximum closed-loop gain of 5000. The alarm can be driven with the þ5 V available from a saturated type #1 OP AMP. Only 15-V and þ5-V sources are available. Design the alarm circuit.