Photoelectric conversion and voltage-to-current conversion circuit diagram

The principle of the photoelectric conversion process is that photons transfer energy to electrons, causing them to move to form an electric current. There are two ways to solve this process. The most common one is to use solid devices with silicon as the main material, and the other is to use photosensitive dye molecules to capture the energy of photons. The absorption of photon energy by the dye molecules causes the separation of negatively charged electrons and positively charged holes in the semiconductor.

A voltage-to-current converter is a circuit that converts an input voltage signal into a current signal. It is a voltage-controlled current source.

The following is a photoelectric conversion and voltage-to-current conversion circuit diagram.

Voltage-to-current conversion circuit diagram

In order to obtain a good linear correspondence between the input and output, special attention must be paid to the selection of components, such as input resistors R1, R2 and feedback resistor Rw. Low-temperature drift precision resistors or precision potentiometers must be selected. The components must be accurately measured before welding. , and carefully tuned for optimal performance. We have tested in many practical applications and found that the maximum nonlinear distortion of the above conversion circuit is generally less than 0.03%, and the conversion accuracy meets the requirements.