Correctly select the resistance value and error resistance of the resistor. The principle is that the difference between the nominal resistance of the resistor used and the resistance of the resistor required is as small as possible.
Error selection: time constant RC circuit required resistor error as small as possible. Generally can be selected within 5%. For decoupling circuit, feedback circuit filter circuit load circuit error is not too high. Optional 10%-20% resistance Device.
Pay attention to the limit parameters of the resistor. Rated voltage: When the actual voltage exceeds the rated voltage, even if the power requirement is met, the resistor will be damaged by breakdown.
Rated power: The rated power of the selected resistor should be greater than twice the actual withstand power to ensure the long-term reliability of the resistor in the circuit.
General-purpose resistors are preferred. There are many types of general-purpose resistors, complete specifications, large production batches, and a choice of resistance range, appearance shape, and size. It is easy to purchase and maintain.
According to the characteristics of the circuit, the high-frequency circuit is selected: the smaller the distribution parameter, the better, and the high-frequency resistor such as metal film resistor and metal oxide film resistor should be used.
Low frequency circuit: winding resistance, carbon film resistance are applicable.
Power amplifier circuit, bias circuit, sampling circuit: the circuit has higher stability requirements, should choose a resistor with a small temperature coefficient.
Decoupling circuit, filter circuit: There is no strict requirement for resistance change, any type of resistor is applicable.
Select the resistor according to the size of the board. Select the resistor according to the size of the board to avoid unnecessary load on the board.
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