Dark Current Compensation Circuit for Sensor Signal Overflow

The patent applies preliminary action by performing dark current compensation before the analog gain amplification stage. The dark current compensation circuit subtracts the dark current signal from the analog sensing signal to generate a compensated signal, which is then amplified. This prevents the dark current from causing overflow during amplification, thereby preserving target signal information that would otherwise be lost.

The patent converts the harmful effect of high dark current in high temperature environments into a beneficial compensation mechanism. The dark current compensation circuit measures the dark current signal and uses it to generate a compensation signal that is subtracted from the analog sensing signal. This transforms the previously harmful dark current into a useful reference for removing its unwanted effects, enabling reliable operation in high temperature conditions.

The patent introduces a dark current compensation circuit as an intermediary component between the sensor circuit and the analog gain circuit. This intermediary circuit processes the analog sensing signal by subtracting the dark current component, generating a compensated signal that preserves target information. The intermediary approach effectively separates the dark current removal function from the amplification function, preventing information loss while adding manageable complexity.