What is Transconductance?
The ratio of the change in drain current to the change in gate voltage, written gm. It expresses a transistor's amplifying ability; amplifier gain is roughly gm times the load resistance.
Field: MOSFET
Transconductance in the explanations
A bipolar transistor's transconductance is gm = IC/VT, so 1 mA ÷ 26 mV ≈ 38 mS.
What is the approximate transconductance gm of a bipolar tr…Transconductance gm = ∂ID/∂VGS describes how much drain current changes per change in gate voltage.
What is the definition of the transconductance gm of a MOSF…
Questions that mention Transconductance (3)
- What is the approximate transconductance gm of a bipolar transistor operating at a collector current of 1 mA? (Room temperature, thermal voltage VT ≈ 26 mV)
- In a common-emitter amplifier with transconductance gm = 40 mS and collector resistor RC = 5 kΩ, roughly what is the magnitude of the voltage gain? (Ignore the load.)
- What is the definition of the transconductance gm of a MOSFET?
Related terms
Body effect Channel-length modulation CMOS DIBL Flat-band voltage GIDL (gate-induced drain leakage) Inversion layer LDD structure Punch-through Short-channel effect