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So I am trying to implement the circuit described in this paper(https://ieeexplore.ieee.org/abstract/document/8846110) in LTSPICE. The circuit is shown below.
This is the oscillator output:
The paper claims that the circuit can be used to measure the resonant frequency of the coupled LC tank. By changing the voltage of the varactor diode, the frequency of oscillation of the colpitt's oscillator is changed to generate a frequency sweep. At the resonant frequency, the emitter current(or voltage Ve) is maximum. However, on simulating the circuit, I get same value of Ve. The waveform of Ve is as shown below:
The expected wave form should be like a half sin with a peak. However I am getting the response as seen above. It doesnot change with the varactor diode capacitance, even though I have designed the circuit such that resonance should have occured when the varactor diode voltage will be 5V. Please help me out with this!
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