LC frequency selection network
The LC frequency selection network is composed of an inductive coil and a capacitor. When a certain amount of energy is granted by the outside world and the circuit parameters satisfy a certain relationship, a periodic oscillation circuit of voltage and current can be generated in the circuit. If the circuit can generate the maximum voltage or flow the maximum current on the electric antigen piece under the action of the alternating signal of a certain frequency, that is, it has resonance characteristics, so the circuit is also called a resonance circuit.
The resonance circuit is divided into:
1. Series resonant circuit
2. Parallel resonant circuit
3. Coupling resonance circuit
use:
1. Make use of his frequency selection characteristics to form various resonance generators
2. Act as a resonant circuit in the self-excited oscillator
3. Used as frequency selection network in modulation, frequency conversion and demodulation 
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