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(a) Time periodic capacitor C (t) connected to the inductor L0 and associated loss/gain Gin parallel. The capacitor varies between two values C1 and C2 with Tm period, as shown in the subset. (b) Real and (c) imaginary parts of resonance frequency evolution varying modulation frequency fm where the LC tank is connected to the lossy conductance G = 1mS. (d) The time domain signal of the second order EPD which is indicated the decaying signal associated to the positive imaginary part of eigenfrequencies. (e) Real and (f) imaginary parts of resonance frequency evolution varying modulation frequency fm where the LC tank is connected to the negative conductance G = − 1mS. (g) Capacitor’s voltage obtained from Keysight ADS circuit simulator, which shows the rising signal. In all time domain simulation, the capacitor has an initial condition of vc (0−) = 50mV.
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