tailieunhanh - Điện tử_ Chapter 12

Tài liệu tham khảo về môn Điện tử_ Chapter " Field- Effect Transistors" dành cho các bạn học viên, sinh viên đang theo học ngành điện- điện tử. | Chapter 12 Field-Effect Transistors Chapter 12 Field-Effect Transistors Understand MOSFET operation. 2. Analyze basic FET amplifiers using the load-line technique. 3. Analyze bias circuits. 4. Use small-signal equivalent circuits to analyze FET amplifiers. 5. Compute the performance parameters of several FET amplifier configurations. 6. Select a FET amplifier configuration that is appropriate for a given application. 7. Understand the basic operation of CMOS logic gates. NMOS AND PMOS TRANSISTORS Operation in the Cutoff Region Operation in the Triode Region Operation in the Saturation Region MOSFET Summary LOAD-LINE ANALYSIS OF A SIMPLE NMOS AMPLIFIER To establish the load line, we first locate two points on it. Amplifier Analysis Amplifier analysis has two steps: 1. Determine the Q point. 2. Use a small-signal equivalent circuit to determine impedances and gains. The Fixed- Plus Self-Bias Circuit SMALL-SIGNAL EQUIVALENT CIRCUITS COMMON-SOURCE AMPLIFIERS The Small-Signal Equivalent Circuit In small-signal midband analysis of FET amplifiers, the coupling capacitors, bypass capacitors, and dc voltage sources are replaced by short circuits. The FET is replaced with its small-signal equivalent circuit. Then, we write circuit equations and derive useful expressions for gains, input impedance, and output impedance. Voltage Gain Input Resistance Output Resistance To find the output resistance of an amplifier, we disconnect the load, replace the signal source by its internal resistance, and then find the resistance looking into the output terminals. SOURCE FOLLOWERS The Small-Signal Equivalent Circuit Voltage Gain Input Resistance Output Resistance Source-Follower Characteristics The source follower has voltage gain slightly less than unity, high input impedance, and low output impedance. Current gain and power gain can be larger than unity. CMOS Inverter CMOS NAND Gate CMOS NOR . | Chapter 12 Field-Effect Transistors Chapter 12 Field-Effect Transistors Understand MOSFET operation. 2. Analyze basic FET amplifiers using the load-line technique. 3. Analyze bias circuits. 4. Use small-signal equivalent circuits to analyze FET amplifiers. 5. Compute the performance parameters of several FET amplifier configurations. 6. Select a FET amplifier configuration that is appropriate for a given application. 7. Understand the basic operation of CMOS logic gates. NMOS AND PMOS TRANSISTORS Operation in the Cutoff Region Operation in the Triode Region Operation in the Saturation Region MOSFET Summary LOAD-LINE ANALYSIS OF A SIMPLE NMOS AMPLIFIER To establish the load line, we first locate two points on it. Amplifier Analysis Amplifier analysis has two steps: 1. Determine the Q point. 2. Use a small-signal equivalent circuit to determine impedances and gains. The Fixed- Plus Self-Bias Circuit SMALL-SIGNAL EQUIVALENT CIRCUITS COMMON-SOURCE AMPLIFIERS The Small-Signal Equivalent