The low-frequency voltage amplifier is a professional electronic device for voltage signal amplification, mainly used in precision testing, instrumentation and other fields. Its main function is to amplify low-level signals to higher levels for measurement and analysis. When choosing a low-frequency voltage amplifier, you need to understand its main performance indicators to ensure that you choose the equipment that suits your needs.
The following are the main performance indicators of low frequency voltage amplifiers:
gain
Amplification refers to the ratio between input voltage and output voltage, usually expressed as V/V or dB. The larger the magnification, the higher the output voltage, which improves the signal-to-noise ratio. Therefore, when selecting a low-frequency voltage amplifier, an appropriate magnification should be selected according to actual needs.
bandwidth
Bandwidth refers to the frequency range over which a low-frequency voltage amplifier can effectively amplify a signal. Since the function of the low-frequency voltage amplifier is to amplify low-level signals, its bandwidth is usually below several kilohertz. When selecting a low-frequency voltage amplifier, it is necessary to confirm the frequency range of the desired signal and select an appropriate bandwidth.
input resistance
The input impedance is the input circuit impedance of the low frequency voltage amplifier and is usually matched to the circuit under test. The size of the input impedance determines the impact of the low-frequency voltage amplifier on the circuit under test. If the input impedance is too small, it will cause a large load on the circuit under test.
Recommended Voltage Amplifier: ATA-2031
Figure: ATA-2031 High Voltage Amplifier Index Parameters
output impedance
The output impedance is the impedance of the output circuit of the low-frequency voltage amplifier. For the load after the amplified voltage signal, the output impedance should be as small as possible, so as to minimize signal distortion and noise level.
noise
When the low-frequency voltage amplifier amplifies the signal, it will amplify the noise together, so its noise level must be controlled within an appropriate range. Generally speaking, the noise level of the low-frequency voltage amplifier is very low, but in practical applications, the appropriate noise level should also be selected according to the needs.
stability
The low-frequency voltage amplifier should have high stability to ensure that the output voltage will not change or drift during long-term use. The stability mainly depends on the circuit structure and the selection of components, and is also affected by the external environment and temperature changes.
The main performance indicators of low-frequency voltage amplifiers include magnification, bandwidth, input impedance, output impedance, noise, and stability. When choosing a low-frequency voltage amplifier, you should choose the appropriate equipment according to your actual needs, and conduct a comprehensive evaluation and comparison of its performance indicators to ensure that you choose the equipment that best suits your needs.