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subthreshold region of MOSFET
- Thread starter Babun Pal
- Start date
Have you done any research? I'd never heard of subthreshold conduction but there's a wikipedia page with a summary here https://en.wikipedia.org/wiki/Subthreshold_conduction
Bordodynov
- Joined May 20, 2015
- 3,430
Vgs<Vth id>0
The current varies exponentially with the gate voltage.
The current varies exponentially with the gate voltage.
Hi,
Could you please site an example fo the application of subthreshold region of operation of MOSFET.
Thank you.
From wikipedia:
Sub-threshold electronics[edit]
Some devices exploit sub-threshold conduction to process data without fully turning on or off. Even in standard transistors a small amount of current leaks even when they are technically switched off. Some sub-threshold devices have been able to operate with between 1 and 0.1 percent of the power of standard chips.[7]
Such lower power operations allow some devices to function with the small amounts of power that can be scavenged without an attached power supply, such as a wearable EKG monitor that can run entirely on body heat.[7]
An example could be a linear audio power amplifier using (complementary) MOSFETs for the output.
Benta.
Subthreshold operation is normally used at very low currents for Class A micropower (or nanopower) circuits.
Linear power amplifiers operate in the saturation region at much higher currents.
The transistors in a complementary Class AB or B amplifier may rapidly go through the subthreshold region when amplifying an AC signal but that is not considered to be operating in that region.
For that matter a MOSFET switch will also momentarily go through the subthreshold region when switching, but that's also incidental to its operation.
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