(1) amplifier circuit: used for voltage, current or power amplification of signals.

(2) Filter circuit: used for signal extraction, transformation or anti-interference.

(3) Arithmetic circuit: it completes the operations of signal proportion, addition, subtraction, multiplication, division, integration, differentiation, logarithm and exponent.

(4) Signal conversion circuit: used to convert current signal into voltage signal or voltage signal into current signal, DC signal into AC signal or AC signal into DC signal, and DC voltage into frequency proportional to it.

(5) Signal generating circuit: used to generate sine wave, rectangular wave, triangular wave and sawtooth wave.

Extended data

The characteristics of analog circuits are as follows:

1, the function value of analog circuit is infinite;

2. When the image information and sound information change, the waveform of the signal also changes, that is, the information to be propagated by the analog signal is contained in its waveform (the information change law is directly reflected in the amplitude, frequency and phase changes of the analog signal).

3. The primary analog circuit mainly solves two major problems: 1 amplification and two signal sources.

4. The analog signal is continuous.

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