RC circuits are widely used in analog circuits and pulse digital circuits. If RC parallel circuits are connected in series, low-frequency signals can be attenuated; If connected in parallel, high-frequency signals can be attenuated, that is, filtered.
According to the external excitation in the circuit, the response in the transient process of the circuit can be divided into three types;
1. Zero-state response: the response that the energy storage element in the circuit has no initial energy storage and is only maintained after the excitation power supply is switched.
2. Zero input response: There is no independent power supply in the circuit after switching, and the response is only maintained by the initial energy storage of energy storage elements.
3. Full response: After switching, the circuit has both independent excitation power supply and initial energy storage, and * * * keeps the same response.
Extended data:
Classification of shaping circuits:
I. RC series circuit
Circuit features: DC current cannot flow because of the existence of capacitor, and both resistance and capacitor hinder the current. Its total impedance is determined by resistance and capacitive reactance, and varies with frequency.
Second, RC parallel circuit
RC parallel circuit can transmit DC signal and AC signal. The series circuit with RC has the same turning frequency: F0 =1/2π r1c1. When the input signal frequency is less than f0, the signal is DC relative to the circuit, and the total impedance of the circuit is equal to r1; When the input signal frequency is greater than f0, the capacitive reactance of C 1 is relatively small, and the total impedance is resistance plus capacitive reactance.
Thirdly, RC series-parallel circuit
The RC series-parallel circuit has two turning frequencies f0 1 and F02: F01=12π r2c1,F02 =1/2π c1* [r1]
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