Differential Sensor Circuit for Low-Power Gas Measurement

The patent removes the power supply circuit section that stabilizes voltage from the system. Instead of using active voltage stabilization components that consume power, the invention relies on the inherent stability of the battery voltage and uses signal processing techniques (differential amplification) to achieve accurate measurements without the need for additional power-consuming stabilization circuits.

The battery-powered alarm system uses its own operational characteristics (the natural voltage output of the battery and sensor) without requiring external stabilization. The differential amplifier circuit processes the sensor output directly, utilizing the existing voltage levels rather than attempting to stabilize them actively, thereby eliminating unnecessary power consumption.

The patent uses differential amplification where two amplified signals are subtracted from each other. Each amplifier operates at a moderate amplification factor, but the differential processing enhances the effective signal-to-noise ratio. This approach achieves high measurement precision without requiring excessively high amplification factors that would consume more power.

The patent combines two amplification paths into a single differential output. By merging the amplified sensor signal and reference signal through differential subtraction, the system achieves enhanced measurement precision while distributing the amplification load across two moderate-gain amplifiers rather than requiring one high-gain amplifier, thereby reducing overall power consumption.