What is parasitic transistor?
The parasitic structure is usually equivalent to a thyristor (or SCR), a PNPN structure which acts as a PNP and an NPN transistor stacked next to each other. During a latch-up when one of the transistors is conducting, the other one begins conducting too.
How do you get rid of parasitic capacitance?
Removing the inner-layer ground plane helps reduce parasitic capacitance….How to Remove Parasitic Capacitance
- Increase clearance between conductors. If possible, allow for a higher clearance between traces in the design.
- Use ground plane appropriately.
- Reduce vias.
What causes parasitic capacitance?
When two electrical conductors at different voltages are close together, the electric field between them causes electric charge to be stored on them; this effect is capacitance. …
What is parasitic device?
The term is commonly used to describe parasitic structures formed on an integrated circuit whereby an unwanted semiconductor device is formed from p-n junctions which belong to two or more intended devices or functions.
What are parasitic diodes?
As a consequence of the MOSFET structure, the body diode is formed by the pn junction between the source and drain, and is also called a parasitic diode or an internal diode. The performance of the body diode is one important parameter of the MOSFET, and is important when using the MOSFET in an application.
What are effects of parasites?
Parasites may influence their hosts in different ways. They may cause the death of the host due to a direct lethal effect or an indirect effect. Direct lethal effects may occur if killing is a part of the life cycle of the parasite or if hosts and parasites have not developed an equilibrium.
What things can be done to minimize parasitic effects?
Reducing Parasitic Capacitance and Inductance Reducing parasitic inductance requires making the equivalent loop area covered by traces as small as possible. The best way to do this is to place the ground plane for critical traces directly above the layer containing your ground plane.
What do bypass capacitors help with?
A bypass capacitor is used to prevent noise from entering the system by bypassing it to the ground. It is connected between the supply voltage (Vcc) and ground (GND) pins to reduce power supply noise and voltage spikes on the supply lines.
What are parasitic effects?
The Parasitic Capacitive Effect When two conductive elements on a PCBA are close to each other and at different voltage levels they form an intrinsic and typically unwanted capacitor. This is known as the parasitic capacitive effect.
What is the purpose of parasitic extraction?
The major purpose of parasitic extraction is to create an accurate analog model of the circuit, so that detailed simulations can emulate actual digital and analog circuit responses. Digital circuit responses are often used to populate databases for signal delay and loading calculation such as: Timing analysis.
Why do we need parasitic extraction?
The major purpose of parasitic extraction is to create an accurate analog model of the circuit, so that detailed simulations can emulate actual digital and analog circuit responses. Digital circuit responses are often used to populate databases for signal delay and loading calculation such as: Circuit simulation.
What is parasitic BJT?
Parasitic BJT: The body region serves as the base, the source as the emitter and the drain as the collector. It is important to keep this BJT OFF of all times by keeping the potential of the base as close to the emitter potential as possible. This is accomplished by shorting the body and the source part of the MOSFET.
What is the parasitic capacitance between transistors and base electrodes?
Miller capacitance. The parasitic capacitance between the input and output electrodes of inverting amplifying devices, such as between the base and collector of transistors, is particularly troublesome because it is multiplied by the gain of the device.
Is the parasitic capacitance of a transmission line always significant?
Unfortunately, transmission lines cannot always be considered in isolation. If two transmission lines travel side-by-side for a long distance, the parasitic capacitance between them is significant. As shown in Fig. 4.35, a wire has capacitance to any other adjacent conductor.
What is the parasitic capacitance of a multistage amplifier?
A transistor in a multistage amplifier has parasitic capacitances Cbe = 40 pF, Cbc − 5 pF, and Cce. The combined output capacitance Cd, which is made up of Cce and the input capacitance of the following stage, is Cd = 300 pF.
What is the parasitic capacitance of a MOSFET?
The MOSFET designed in example 7.4 has a parasitic capacitance of CISS = 2.5 nF, CRSS = 200 pF, and COSS = 600 pF. A gate pulse of 10 V is applied through a gate resistor of 10 Ω to the MOSFET to turn it on from an off-state voltage of 100 V to an on-state current of 500 mA.