What is parasitic capacity?

parasitic capacity, in electrical circuits, is another effect of conductors that serve as a plate between dielectric, which is usually air. It becomes a problem with higher frequencies, because very small distributed capacities that exist will have lower impedance at these frequencies. This effect can be solved in the design of the circuit design, where the location of the components can reduce the effects to the point where the satisfactory operation is achievable. These capacitors are considered limited to certain components as concentrated components; For distributed capacity, there is a need for planning of components and circuits. When the inductor is made, it is always distributed capacity; This can be considered parasitic capacity. The ideal inductor will have zero distributed capacity; Therefore, it will resonate at the frequency near the infinity. It is well known that Minduktory ST will have a non -infinite resonant frequency due to distributed winding capacity leading to measurable resonant frequencyi.

parasitic capacitance in radiofrequency (RF) amplifiers can cause these amplifiers to have low profits due to parasitic loss. In some cases, they may cause these amplifiers to oscillate. With parasitic capacity, the real perimeter in the real world is a district drawn in the design phase plus capacitance on the ground or between different points of the circuit. In some cases, the solution is to simply reduce focused capacity for a certain location of the circuit. In other cases, the solution could be an increase in inductance to maintain a certain frequency pass.

There are cases where the characteristics of electronic components can compensate for parasitic capacity. For example, reduced RF output due to parasitic liquiditance can be increased by means of a higher profit transistor. In some cases, the odd effects of parasitic capacity may be compensated by adding the perimeter phases.

The parasitic element may exist due to the proximity of the conductors or the length of the tracks, conductors or conductors of the components. A joint approach to reducing the chances of discovering the parasitic element is shortening the wires and reducing the surface area in the components and footsteps on plates with circuits (PCB). Based on these procedures to avoid excessive parasitic effects, miniaturization of components and traces of PCB has become a standard practice.

in digital switching circuits, increase time and digital fall time significantly affect the maximum speed. Parasitic capacity on inputs and outputs of digital devices increases the rise times and decrease. An alternative is the use of output devices that can insert higher currents to compensate for parasitic capacity. Unfortunately, this approach increases direct current energy (DC). This explains why very high -speed digital circuits usually require a huge amount of DC currents.