An enhancement-mode n-channel MOSFET has gate-source threshold voltage VTR = +2V and source-drain conductance parameter K = 1.0 mA/V2 (= the constant of proportionality between source-drain current and the square of the excess of gate-source voltage over the threshold voltage, when the MOSFET is in constant-current or saturation mode). Its source terminal is connected to ground. The gate terminal is connected direct to the drain terminal and also to one end of a 1 kΩ resistor. The other end of this resistor is connected to the +15V supply. (i) Show that, assuming it is conducting at all, the MOSFET is operating in constant-current (i.e., saturation) mode; (ii) calculate the current in the resistor and the voltage across it.
An enhancement-mode n-channel MOSFET has gate-source threshold voltage VTR = +2V and source-drain conductance parameter K = 1.0 mA/V2 (= the constant of proportionality between source-drain current and the square of the excess of gate-source voltage over the threshold voltage, when the MOSFET is in constant-current or saturation mode). Its source terminal is connected to ground. The gate terminal is connected direct to the drain terminal and also to one end of a 1 kΩ resistor. The other end of this resistor is connected to the +15V supply. (i) Show that, assuming it is conducting at all, the MOSFET is operating in constant-current (i.e., saturation) mode; (ii) calculate the current in the resistor and the voltage across it.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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An enhancement-mode n-channel MOSFET has gate-source threshold voltage VTR = +2V and source-drain conductance parameter K = 1.0 mA/V2 (= the constant of proportionality between source-drain current and the square of the excess of gate-source voltage over the threshold voltage, when the MOSFET is in constant-current or saturation mode). Its source terminal is connected to ground. The gate terminal is connected direct to the drain terminal and also to one end of a 1 kΩ resistor. The other end of this resistor is connected to the +15V supply. (i) Show that, assuming it is conducting at all, the MOSFET is operating in constant-current (i.e., saturation) mode; (ii) calculate the current in the resistor and the voltage across it.
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