One characteristic of a series resonant (or series resonant device) circuit is the dependence of the circuit response amplitude on the frequency harmonics. Within the narrow frequency range around the resonant frequency, the response amplitude reaches its maximum value, while at frequencies significantly different from the resonant frequency, the response amplitude is much smaller than the maximum value. If the sum of harmonic resonances with the same amplitude but different frequencies is added to the input of such a circuit, it can be observed at the output that the resonance amplitude, which is close to the resonance frequency, greatly exceeds the resonance amplitude, and the resonance frequency is different from the resonance frequency. The circuit actually 'passes' vibrations at certain frequencies and' does not pass' vibrations at other frequencies.
In an ideal situation, the response of the selected circuit should remain constant within a certain frequency range (known as the circuit bandwidth) and be zero outside of that range. The normalized frequency response of an ideal circuit should have a rectangular shape. The frequency response of the actual selected circuit (including the frequency response of the series resonant circuit) differs from the characteristics of the ideal selected circuit, as there is no clear boundary between the frequency range of emission and delay (suppression). Obviously, the closer their normalized frequency response is to a rectangle, the higher the selection characteristics of the actual circuit.
According to the formula, the modulus of the medium current/is
In fact, they also use the frequency dependence of the current module, known as the input resonance characteristic of PSK.
The frequency dependence curve of the current module is completely similar to the frequency response curve of the input conductivity. They enable you to define bandwidth and rectangular UCS ™ Ratio.