In the process of High Frequency PCB Circuit Card Reverse Engineering, the index is usually recorded in the engineer’s catalogue in the form of self-resonance frequency. If the frequency below self-resonance is used directly, the reactance will become positive, mainly because the reactance is the same as the impedance, if the frequency is more than the self-resonant frequency. When low, the reactance will become a negative value. If the frequency is higher than the self-resonance frequency, the reactance will become positive and the impedance will become positive.
The condenser will have an impedance characteristic above a certain high frequency area due to the impedance component of the lead wire. If it is lower than the self resonance, the reactance will become a positive value. In other words, the main function of the condenser is that the reactance becomes positive above its frequency and the impedance becomes negative.
The combined capacity between the input and output of the transformer will halve the high-frequency pulse, causing the machine the noise resistance is deteriorating, so it is necessary to carefully select the high-frequency wave transformer with small combined output capacity and inter-line capacity.
High Frequency PCB Circuit Card Reverse Engineering
The high-frequency circuit uses the floating capacity as much as possible. Although the physical positional relationship is increased, the effect of reducing the floating capacity can be obtained. However, as opposed to the miniaturization of the machine, an effective countermeasure is to reduce the length of the side-by-side circuit pattern obtained from High Frequency PCB Circuit Card Reverse Engineering. At the same time, try to use floating capacity, such as stub, λ/4 transmission line, and characteristic impedance are all feasible solutions.
Floating capacity within the component and between the wire, among the wires, and the ground wires. The floating capacity within the component degrades the frequency characteristics and reduces the speed of the action, which is often the main cause of resonance. Its detailed action mechanism is as follows:
The inherent parasitic capacitance of the inductor coil makes the inductor a capacity in a high-frequency field. Although this feature is applicable to all electronic components, it does not show ideal characteristics in the broadband field, especially the reactance of the inductor. The range that can be calculated is limited.
