EE314 Intel Pentium 4 Field Effect Transistors Equivalent Circuits.

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EE314 Intel Pentium 4 Field Effect Transistors Equivalent Circuits

Chapter 12: Field Effect Transistors 1.Small-Signal Equivalent Circuits 1.Examples 2.Technology 3.Future Devices MOSFET Transistor

Current-Voltage Relations MOSFET Transistor NMOS transistor, 0.25  m, L d = 10  m, W/L = 1.5, V DD = 2.5V, V T = 0.4V Quadratic Relationship x V DS (V) I D (A) VGS= 2.5 V VGS= 2.0 V VGS= 1.5 V VGS= 1.0 V TriodeSaturation V DS = V GS - V T cut-off

Load-Line Analysis of NMOS Amplifier It is a graphical analysis similar to load-line analysis of pn diode. Schematic Circuit Analysis: Input loop Output loop Load line v GS v DS We look for the operating point

Load-Line Analysis of NMOS Amplifier Exercise: Draw the Load line R D = 1 k 

Load-Line Analysis of NMOS Amplifier Load line Taking i D =0 or v DS =0 we find out the load lane and the quiescent operating point Q for V GS =4V The quiescent values v in (t)=0 then i DQ =9 mA v GSQ =4V and v DSQ =11V Points A & B intersection of curve and the load-line for the maximum and the minimum gate voltage

Input signal Load-Line Analysis of NMOS Amplifier (peak-to-peak amplitude is 2V) 12V peak-to-peak Inverse operation The positive peak of the input occurs at the same time as the min. value of v DS. The output is not a symmetrical sinusoid! (nonlinear distortion) v DS (t) v in (t)2V peak-to-peak

Self Bias Circuits Analysis of amplifier circuits is often undertaken in two steps: (1) The dc circuit analysis to determine the Q point. It involves the nonlinear equation or the load-line method. This is called bias analysis The fixed-plus self- bias circuit Exercise: Find V G voltage as a function of V DD, R 1 and R 2 InputOutput +vG_+vG_

Self Bias Circuits Analysis of amplifier circuits is often undertaken in two steps: (1) The dc circuit analysis to determine the Q point. It involves the nonlinear equation or the load-line method. This is called bias analysis The fixed-plus self- bias circuit InputOutput +vG_+vG_

Self Bias Circuits Analysis of amplifier circuits is often undertaken in two steps: (1) The dc circuit analysis to determine the Q point. It involves the nonlinear equation or the load-line method. This is called bias analysis (2) Use a linear small-signal equivalent circuit to determine circuit parameters Equivalent circuit Analysis… v GS v DS find v GS

Self Bias Circuits Plot ofand Disregarded root for v GS < V t0 Use only larger root for v GS and smaller for i D Example 12.2

Self Bias Circuits Analysis of amplifier circuits is often undertaken in two steps: (1) The dc circuit analysis to determine the Q point. It involves the nonlinear equation or the load-line method. This is called bias analysis (2) Use a linear small-signal equivalent circuit to determine circuit parameters Equivalent circuit Analysis… v GS v DS For saturation region find i D

Self Bias Circuits Analyze the self-bias circuit shown. The transistor has KP=50  A/V 2, V to =2V, L=10  m, and W=400  m find v GS find i D Exercise 12.5 find v DS

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