Example to Find Minimum and Maximum on Resistance of MOSFET as Switch - Analog & Mixed VLSI Design

TL;DR

Calculating the minimum and maximum on resistance of a MOSFET switch based on given parameters and conditions.

Transcript

hello everyone today i will take an example to find minimum and maximum on resistance of mosfet as a switch so let's see it is given that we need to calculate the minimum and maximum on the resistance of m1 assuming mu n cox to be 50 micro ampere per volt w by l is given the ratio and radius is 0.7 vdd is 3 volt and channel length modulation is to ... Read More

Key Insights

• 😶 Calculating the minimum and maximum on resistance of a MOSFET switch requires parameters such as voltage, W/L ratio, and mu n cox.
• ➖ The region of operation for the MOSFET switch can be determined by comparing the given parameters to the condition of radius less than Vgs minus Vt.
• ❓ The on resistance calculation assumes negligible phase shift and does not consider channel length modulation.

Questions & Answers

Q: What is the input voltage value used in the calculation of the minimum and maximum on resistance of the MOSFET switch?

The input voltage value used is 0.5 volts, which is the maximum value for the input signal.

Q: What is the frequency mentioned in the content and how does it affect the on resistance calculation?

The frequency mentioned is 10 megahertz. The on resistance calculation is unaffected by frequency as it assumes negligible phase shift.

Q: How does the content determine the region of operation for the MOSFET switch?

The content uses the condition of radius less than Vgs minus Vt for the triode region. By checking the given parameters, it concludes that the MOSFET switch operates in the triode region.

Q: What does the term "zero offset switches" refer to in the content?

"Zero offset switches" refers to MOS devices operating in the deep triode region. They exhibit no DC shift between the input and output voltage of a sampling circuit, as demonstrated in the given example.

Summary & Key Takeaways

• The content discusses the calculation of the minimum and maximum on resistance of a MOSFET switch using given parameters such as voltage, frequency, and channel length modulation being neglected.

• The content demonstrates how to determine the region of operation (saturation or triode) for the transistor and concludes it operates in the triode region.

• Using the given parameters, the content provides calculations for the maximum and minimum on resistance values for the MOSFET switch.