(a) On the MOSFET output curve of Figure P11.16, sketch the...

(a) On the MOSFET output curve of Figure P11.16, sketch the curve of drain current, $I_D$, versus $V_D$ for the circuit shown in Figure P11.17(a). (b) What other two-terminal device has a $V-I$ characteristic that resembles a transistor connected this way? (c) In what region of operation is the transistor biased? (d) Repeat 11.17(a) for the circuit in Figure P11.17(b). Figure P11.17 can't copy

Key Concepts

MOSFET Output Characteristics

This concept deals with the relationship between the drain current (ID) and the drain-to-source voltage (VDS) for a given gate-to-source voltage (VGS) in a MOSFET. It includes understanding how the MOSFET operates in different regions (triode and saturation), how channel-length modulation affects the curve in saturation, and why the output current becomes relatively constant in saturation despite increases in VDS.

Diode?Connected Configuration

A diode-connected transistor is a configuration where the gate and drain of the MOSFET are tied together. In this configuration, the device mimics the behavior of a diode because it forces the transistor to operate at the edge between the triode and saturation regions, resulting in a V–I characteristic that resembles that of a two-terminal diode. This concept is crucial in biasing and current mirror circuits.

Saturation Region Operation

This concept refers to the operating region of a MOSFET where the drain-to-source voltage (VDS) is high enough that the inversion channel is pinched off at the drain end, and the drain current becomes relatively insensitive to further increases in VDS. In many biasing schemes, such as with the diode-connected configuration, the MOSFET is biased in the saturation region to achieve a stable current source or other predictable circuit behavior.

Load-Line Analysis

Load-line analysis is an essential technique for understanding and predicting the operating point of a circuit containing nonlinear devices such as MOSFETs. By superimposing the device’s characteristic curves with the linear load line determined by the circuit’s resistive elements, one can graphically determine the Q-point or bias point at which the device operates. This method explains how different circuit configurations shift the operating point on the device's output characteristics.

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