Contents
How can you reduce impedance?
You can reduce your input impedance by simply adding a parallel resistor to ground. This approach is often taken to ensure a transmission line is terminated by a matching impedance. You can also reduce input impedance (to near zero) using feedback, such as in a transimpedance amplifier.
What is Interplane capacitance?
Interplane capacitance, the capacitance formed by two planes closely spaced to each other, has proved necessary to provide the very rapid switching currents needed by modern logic to drive transmission lines and supply current to IC cores.
How do you control impedance matching?
Because capacitance occurs as a function of the relative permittivity of the dielectric material, we can control the impedance with a trace that has a uniform cross-sectional geometry and consistent permittivity. With the increase in capacitance, the characteristic impedance decreases.
Why is the impedance of the ground plane important?
Maintaining low impedance for all areas of the ground plane for the entire PCB improves power control and signal quality. Although the ground plane has the most important impedance role, both ground planes and power planes appear as low-impedance paths for signals and can help reduce noise in a circuit.
How to reduce parasitic capacitance in PCB layout?
A good layout should take utmost care while placing a conductive body by the side of another conductive body.
How big is a decoupling capacitor via separation?
Comparison of Decoupling Capacitor Via Separation Distance Effects 0.1 uF Capacitor 10 mils Via Separation October 2007 Dr. Bruce Archambeault 32
What happens if the nearest power plane is not the ground plane?
If the nearest power plane is not the ground plane it first hops into the nearest metallic plane and then goes into the ground plane next to it. If the metallic plane and the ground plane are nearby, they can be assumed to be electrically AC short . They are not DC short.