Under what conditions should I choose a high resistance resistor?

When choosing high resistance resistors, it is usually determined based on specific application requirements and circuit design requirements. Here are some common application requirements where high resistance resistors are chosen:

Amplifier input terminal:
In amplifier circuits, especially preamplifiers, high resistance resistors are often used at the input to limit the flow of current, thereby increasing the input resistance, reducing the impact of the internal resistance of the signal source on the input signal of the amplifier, and improving the gain and stability of the amplifier.
wave filter:
High resistance resistors are often combined with capacitors to form RC filters, which are used to filter out high-frequency noise or interference signals in circuits. A high resistance resistor can ensure sufficient attenuation during the filtering process, allowing the filter to operate more effectively.
Power stabilization circuit:
In power regulator circuits, high resistance resistors can be used in voltage divider circuits to stabilize the output voltage. By adjusting the resistance value of the resistor, the output voltage can be precisely controlled to ensure the stability and reliability of the power supply.
Sensor circuit:
In sensor circuits, high resistance resistors are commonly used to convert the output signal of the sensor into current or voltage signals for subsequent processing or measurement. In addition, high resistance resistors can also improve the sensitivity of sensors, enabling them to more accurately reflect changes in the measured physical quantity.
Measurement circuit:
In measurement circuits, high resistance resistors can be used to generate stable voltage or current signals, such as through constant current or constant voltage sources to achieve functions such as resistance measurement and temperature measurement. The stability and accuracy of high resistance resistors are crucial for the accuracy of measurement results.
Current limiting protection:
In situations where it is necessary to limit the current size, such as to prevent damage to circuit components caused by excessive current during short circuits or overloads, resistors with higher resistance values can be selected to reduce the current. This can ensure the safety and reliability of the circuit in abnormal situations.
High precision circuit:
In circuits that require high resistance stability and accuracy, such as precision measurement and signal processing, it is often necessary to use high resistance and high-precision resistors to ensure the performance and stability of the circuit.
In summary, high resistance resistors have a wide range of application scenarios and important roles in circuit design. When selecting high resistance resistors, it is necessary to consider the specific application requirements and circuit design requirements comprehensively to ensure the performance and reliability of the circuit.