What is the analysis step of Integrated circuit application circuit?

( 1 ) DC circuit analysis is mainly to carry out the analysis of the external circuit of the power supply and the ground pin.

Note : the relationship between these power supplies, such as whether it is the power supply pin of the front stage and the back stage circuit, is requested when there are several power supply pins, or the left and right channels of the power supply pin, on the multiple ground pins should also distinguish between them.

( 2 ) Signal transmission analysis is mainly analyzes the outer circuit of the signal input pin and the output pin. When the integrated circuit has a plurality of input and output pins, it is necessary to find out the output pins of the front stage or the rear stage circuit; for the dual-channel circuit, it is also necessary to distinguish the left and right channel input and output pins.

( 3 ) Other pin circuit analysis, such as finding out the negative feedback pin, eliminating the vibration pin, etc, this step is the most difficult, and for beginners to use the lead foot information or internal circuit diagram.

( 4 ) To sum up and master the law of the external circuit of various functional integrated circuits, for example, the law of the outer circuit of the input pin is : through a coupling capacitor or a coupling the circuit is connected to the output end of the front stage circuit; the law of the outer circuit of the output pin is that it is connected with the input end of the rear stage circuit through a coupling circuit.

( 5 ) To analyze the internal circuit diagram of an integrated circuit, because it is best to consult the internal power of the integrated circuit when analyzing the amplification and processing of the signal block diagram. When analyzing the internal circuit diagram, it is possible to know which circuit of the signal is amplified or processed by the arrows in the signal transmission line, which pin is the last signal output from.

( 6 ) To understand some of the key test points and pin DC voltage laws of the integrated circuit, which is very useful for the maintenance circuit.

The DC voltage at the output of the OTL circuit is equal to 1 / 2 of the DC operating voltage of the integrated circuit;

The DC voltage at the output of the OCL circuit is equal to 0V;

The DC voltage of the two outputs of the BTL circuit is equal, the single supply is equal to 1 / 2 of the DC operating voltage, and the double power supply is equal to 0V.

When a resistor is connected between the two pins of the IC, the resistor affects the DC voltage on both pins;

When the cable is connected between the two pins, the DC voltage of the two pins is equal, and the unequal time must be the coil open;

When a capacitor is connected between two pins or connected to an RC series circuit, the DC voltage of these two pins is definitely not equal, indicating that the capacitor has been broken down.

Note : generally do not analyze the working principle of the internal circuit of the integrated circuit, because it is quite complex.

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