What is transistor transconductance
Why is higher transconductance associated with a faster transistor switch?
Here is a quote from that site:
... higher "transconductance" - a measure of the performance of a transistor - than silicon transistors. The higher the transconductance, the faster the transistor can be switched on and off. This means that higher clock frequencies can be supported and that lower core voltages are required.
The argument in bold above is also shown in the Oxford dictionary under the example sentences: https://en.oxforddictionaries.com/definition/transconductance:
"The higher the transconductance, the faster the transistor can be switched on and off."
I know that the transconductance is the slope of the Iout Vin curve. The steeper the curve, the higher the transconductance of the transistor. However, this curve does not have a time axis. It seems that ∆Iout / ∆Vin via DC increments has nothing to do with time. Or is it? How can a faster change be related to a higher transconductance?
There is no time in the following representation (Ic Vbe are DC values as they are capital letters, they are not instantaneous):
Very often the gate-source capacitance of a MOSFET is the dominant factor in how fast a MOSFET can be switched on or off. Rather high currents have to be injected into the gate capacitance in order to change the gate voltage quickly. So if the transconductance on MOSFET A is (about) twice as high as on MOSFET B, you only have to switch a certain load current appropriately, the gate voltage by half the amount compared to MOSFET B.
This normally leads to an increase in the switching speed for a given current injected into the gate.
Circuit time constants are C / g. Higher gm reduce the time constants.
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