Explain the various MOSFET Capacitances & their
significance?
Answer / arpit raj
There are different MOSFET capacitance they are as follows:
1) Cgs : it is the capacitance due to the overlap of the
source and the channel regions by the polsilicon gate and is
independent of applied voltage.
2) Cgd : it consists of 2 parts, first is the capacitance
associated with the overlap of the polysilicon gate and the
silicon below. second is the capacitance associated with the
depletion region immediately under the gate. Cgd is
nonlinear function of voltage.
3) Cds : it is the capacitance associated with the
body-drift diode. it varies inversely with the square root
of drain-source bias.
Significance:
input capacitance : Ciss = Cgs + Cgd, Cds shorted
output capacitance : Coss = Cgd
reverse transfer capacitance : Crss = Cds + Cgd
Cgd provides feedback loop between the output and the input
of the circuit, also called Miller capacitance.
other capacitance are responsible for charging and
discharging , or for switcing purposes
| Is This Answer Correct ? | 37 Yes | 15 No |
What are set up time & hold time constraints? What do they signify?
What transistor level design tools are you proficient with? What types of designs were they used on?
For a single computer processor computer system, what is the purpose of a processor cache and describe its operation?
Explain about stuck at fault models, scan design, BIST and IDDQ testing?
What products have you designed which have entered high volume production?
What is the mealy and moore machine's state diagram that can detect 3 consecutive heads of 3 coins ?
Tell me how BJT works.
Mention what are the two types of procedural blocks in Verilog?
What are the different ways in which antenna violation can be prevented?
Cross section of a PMOS transistor?
Cross section of an NMOS transistor?
what is verilog?