Question

the transconductance gm is given by

Answer 1

Answer:

For an FET, transconductance is the ratio of the change in drain current to the change in gate voltage over a defined, arbitrarily small interval on the drain-current-versus-gate-voltage curve. The symbol for transconductance is gm. The unit is thesiemens, the same unit that is used for direct-current (DC) conductance.

Explanation:

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Answer 2

Transconductance is an expression of the performance of a bipolar transistor or field-effect transistor (FET). In general, the larger the transconductance figure for a device, the greater the gain(amplification) it is capable of delivering, when all other factors are held constant.

Formally, for a bipolar device, transconductance is defined as the ratio of the change in collector current to the change in base voltage over a defined, arbitrarily small interval on the collector-current-versus-base-voltage curve. For an FET, transconductance is the ratio of the change in drain current to the change in gate voltage over a defined, arbitrarily small interval on the drain-current-versus-gate-voltage curve.

The symbol for transconductance is gm. The unit is thesiemens, the same unit that is used for direct-current (DC) conductance.