Principle and Application of Modulator The modulator is an important part of the modulated DC amplifier circuit. As can be seen from the box in the figure below: the DC signal ui to be amplified becomes an AC signal UA after passing through the modulator; after being amplified by the AC amplifier, it is finally converted into a DC output signal UO by the demodulator; the oscillator generates a switching signal UC; it is used to control the sampling action of the modulator. Since the signal amplification task is mainly completed by the AC amplifier, and the zero drift of the AC amplifier is small enough to be ignored, the zero drift of the modulator and demodulator can also be made very small, so the modulated DC amplifier can be used to amplify weak DC signals. There are usually three forms of modulators: mechanical modulators (mechanical choppers), transistor modulators, and field effect tube modulators.
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