Chapter 4, Problem 4.97IP

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 $1\text{μV/psi}\text{.}$ 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 $50\Omega$ at 100 psi to $150\Omega$ at 150 psi. Two types of OP AMPs are available. Type 1 are single-sided, meaning they have a $+V_{CC}$ of 5 V and a $-V_{CC}$ of 0 V. Type 2 OP AMPs are double-sided with a $V_{CC}$ of $\pm 15\text{V}$ and have a maximum closed-loop gain of 5000. The alarm can be driven with the $+5\text{-V}$ available from a saturated type 1 OP AMP. Only 15-V and $+5\text{-V}$ sources are available. Design the alarm circuit.