CMOS Current in triode region equation

In summary, the conversation discusses confusion regarding the equation for PMOS and NMOS drain current in the triode region. The question raises concerns about the polarity of the drain to source current in PMOS and the resulting values in the equation if V(gs) and V(ds) are negative. The response emphasizes the importance of understanding the gate and drain polarities for NMOS and PMOS transistors, rather than focusing too much on mathematical signs.
  • #1
Dhruv
27
0

Homework Statement


Q. I was given a equation for PMOS and NMOS drain current in triode region but I am having some confusion regarding equation please do help.

I think drain to source current in PMOS should be negative but in equation value will come out to be positive if I keep V(gs)
,V(ds) as negative .

Homework Equations

The Attempt at a Solution

 

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  • #2
I wouldn't waste too much time worrying about mathematical polarities.

You know that an NMOS requires the gate to be more positive than the source by at least the threshold voltage Vth, and the drain more positive than the source, and you know the current runs from drain to source.

Similarly, you know that the gate of a PMOS has to be more negative than the source by Vth, and the drain more negative than the source, and that the current runs from source to drain.

That's all you need to know. Spec sheets can be obfuscative if you lend too much credulity to signs.
 

1. What is the CMOS Current in triode region equation?

The CMOS Current in triode region equation is a mathematical formula that describes the relationship between the drain current, gate-source voltage, and other parameters in a CMOS transistor when it is operating in the triode region. It is a key equation in understanding the behavior of CMOS transistors and is used in circuit design and analysis.

2. How is the CMOS Current in triode region equation derived?

The CMOS Current in triode region equation is derived from the basic principles of semiconductor physics and the characteristics of CMOS transistors. It takes into account the carrier mobility, channel length, and width, as well as the gate-source voltage, drain-source voltage, and other factors that affect the flow of current in the triode region.

3. What are the key assumptions made in the CMOS Current in triode region equation?

The CMOS Current in triode region equation makes certain assumptions about the behavior of CMOS transistors, including that the channel is perfectly homogeneous and the electric field is constant along the channel. It also assumes that the channel length is much greater than the channel width and that the gate oxide thickness is constant.

4. How accurate is the CMOS Current in triode region equation?

The CMOS Current in triode region equation is a simplified model and may not accurately predict the behavior of CMOS transistors in all situations. It is most accurate when the assumptions made in its derivation hold true. However, it is still widely used in circuit design and analysis and can provide a good estimate of the drain current in the triode region.

5. How is the CMOS Current in triode region equation used in practical applications?

The CMOS Current in triode region equation is used in circuit design and analysis to determine the drain current in a CMOS transistor when it is operating in the triode region. This information is important for determining the performance of a circuit and ensuring that it meets design specifications. The equation is also used in the design of CMOS transistors to optimize their performance and minimize power consumption.

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