Can Vth of MOS be lowered for lower input voltages?

  • Thread starter shaikss
  • Start date
In summary, the conversation discusses designing a rectifier for lower input voltages and how to lower the Vth in order to achieve this. One potential solution is using a LNA, and another method is adjusting the boron threshold implant for NMOS and PMOS. However, this method only allows for a fixed Vth unless specific instructions are given to fab labs for different dosage.
  • #1
shaikss
33
0
Hi,

I want to design a rectifier for lower input voltages in the order of 100mV.
So, in order to achieve the same, when I use MOS, I want to lower the Vth.
What are the different mechanisms that are implemented in order to lower/cancel the Vth?

Thanks!
 
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  • #3
The question is whether he has external power supply to power up anything. If so, that is going to be easy. If not, then it's going to be very hard.
 
  • #4
Usually Vth is adjusted by Boron threshold adjustment implant for NMOS and vice-versa for PMOS. This thing is included in standard process steps in today's IC process. However, the boron dose is fixed and this generates only one kind of MOS with fixed Vth.

Unless you explicitly tell fab labs to use different dosage, you cannot change Vth.
 

FAQ: Can Vth of MOS be lowered for lower input voltages?

How does the Vth of a MOS transistor affect its performance?

The Vth, or threshold voltage, of a MOS transistor is the minimum voltage required to turn the transistor on. If the Vth is too high, the transistor may not turn on properly, leading to errors in the circuit's operation.

What factors affect the Vth of a MOS transistor?

There are several factors that can affect the Vth of a MOS transistor, including the gate oxide thickness, doping concentration, and channel length. These factors can be controlled during the fabrication process to adjust the Vth.

How can the Vth of a MOS transistor be lowered?

There are several techniques that can be used to lower the Vth of a MOS transistor. These include using a thinner gate oxide, increasing the doping concentration, and reducing the channel length. Additionally, the use of different gate dielectric materials, such as high-k dielectrics, can also lower the Vth.

Are there any drawbacks to lowering the Vth of a MOS transistor?

While lowering the Vth can improve the performance of a MOS transistor, it can also lead to increased leakage current and reduced reliability. This is because lower Vth values can make the transistor more susceptible to noise and other external factors.

What are some applications where lowering the Vth of a MOS transistor is beneficial?

Lowering the Vth of a MOS transistor can be beneficial in applications where high performance and low power consumption are important. This includes mobile devices, where battery life is a concern, and high-speed circuits, such as in microprocessors and memory chips.

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