Summary of the laws of the analog phase response curve, phase response and amplitude response
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perface
Amplitude-frequency response is to discuss the relationship between frequency and its amplitude. A signal usually contains many frequencies. When passing through a certain circuit, the gain (or attenuation) obtained by different frequencies is different. What needs to be discussed is how to avoid or reduce these inconsistencies. Impact.
The phase-frequency response is to discuss the phase offset caused by different frequencies passing through a certain circuit. The so-called phase offset is actually a time delay. According to coswt, we know that the phase is a function of time, so it is more intuitive to understand it directly as a time delay.
So we give the system a sinusoidal input signal, and the system output response varies with the angular frequency w of the sinusoidal input signal. Among them, the change law of the output amplitude with w is the amplitude-frequency characteristic, and the phase difference between the output phase angle and the change law of w constitutes the phase-frequency characteristic.
In the low frequency band, as the signal frequency gradually decreases, the capacitive reactance of coupling capacitors, bypass capacitors, etc. increases, resulting in the loss of dynamic signals and the decline of amplification capabilities.
In the high-frequency band, as the signal frequency gradually increases, the capacitive reactance of stray capacitances such as inter-electrode capacitances of transistors, distributed capacitances, and parasitic capacitances decreases, resulting in loss of dynamic signals and degradation of amplification capabilities.
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