Explain the various MOSFET Capacitances & their
significance?
- 1 Answers
- 22658 Views
- I also Faced
- E-Mail Answers
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 |
In a SRAM layout, which metal layers would you prefer for Word Lines and Bit Lines? Why?
Process technology? What package was used and how did you model the package/system? What parasitic effects were considered?
What types of high speed CMOS circuits have you designed?
Explain ASIC Design Flow?
2 Answers Intel, JK Associates, Mind Tree,
What is the build-in potential?
Explain the Charge Sharing problem while sampling data from a Bus?
what is the use of defpararm?
How to find the read failiure probablity in SRAM?
Explain Cross section of an NMOS transistor?
Are you familiar with the term MESI?
Approximately, what were the sizes of your transistors in the SRAM cell? How did you arrive at those sizes?
Give the logic expression for an AOI gate. Draw its transistor level equivalent. Draw its stick diagram
86 Family 
