Hi everyone,
A RLC resonant network is as Figure 1, seen at my post below.
L=1uH, C=1uF, R=100kOhms.
Source generates a sine wave signal. The source signal's frequency is 159.155kHz and its amplitude is 10V.
1. Theoretical analysis.
The resonant frequency of LC network is about 159.155kHz. Under this frequency, the LC network's AC impedance is very large, and reaches about 1.5 MOhms. So if the circuit becomes steady, Vout is about 0V, whereas Vin-Vout is almost equal to Vin.
2. Tran simulation result.
A tran simulation is implemented with Cadence Spectre. The "stop time" is set to be 1s, so that the circuit can get steady. The tran simulation result is as Figure 2, seen at my post below.
It is seen that, Vout is almost equal to Vin.
By the way, sp and ac simulations are also carried out, which all indicate the LC network has a very large impedance at 159.155kHz.
The tran simulation result is so different from the theoretial analysis, and is not consistent with sp and ac simulation results. Why?
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Hi Mr. Beckett, Thanks for your help.