What is the core problem to be solved by charge amplifier?
Publish Time: 2024-06-25
The core problems to be solved by the charge amplifier are as follows: 1.Very high input impedance: The charge amplifier needs to have an extremely high input impedance, typically above 10 ^ 12 ohms. This is because the charge signal may be lost due to isolation, so the high input impedance ensures that all charge signals are linearly converted to voltage signals. 2.Charge to voltage conversion: The basic operating principle of a charge amplifier is to convert the charge in an input capacitor into a voltage signal and amplify it to a level sufficient to be measured. This involves three main parts: input capacitor, operational amplifier and feedback capacitor. 3.Amplification and measurement of signal: The operational amplifier in the charge amplifier is the key part, which is responsible for amplifying the tiny voltage signal in the input capacitor to hundreds or even thousands of times, so that it can be measured and recorded. 4.Improved stability and linearity: The charge amplifier uses a feedback loop to improve its stability and linearity. The feedback capacitor feeds back the voltage signal output by the operational amplifier to the input capacitor, thereby controlling the amplification factor of the charge amplifier and making the output signal more accurate. 5.Protection of circuits and consumers: Although it is not the direct core problem, the charge amplifier also has the function of protecting the circuit and the electrical equipment in the application. For example, it can convert the high-impedance output of the sensor into a low-impedance output, prevent the short circuit of the power supply, and protect the circuit system. To sum up, the core problem to be solved by the charge amplifier is to ensure that the charge signal can be completely and accurately converted into a voltage signal, and these signals can be recorded through amplification and measurement. This requires a charge amplifier with extremely high input impedance, an efficient charge-to-voltage conversion mechanism, strong signal amplification, and a stable feedback loop.
