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Chapter 13 Bipolar Junction Transistors 1. Understand bipolar junction transistor operation in amplifier circuits. 2. Analyze simple amplifiers using the loadline technique and understand the causes of nonlinear distortion. ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors 3. Use large-signal equivalent circuits to analyze BJT circuits. 4. Analyze bias circuits. 5. Use small-signal equivalent circuits to analyze BJT amplifiers. 6. Compute performance of several important amplifier configurations. 7. Select an amplifier configuration appropriate for a given application. ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors Equations of Operation v BE iE I ES exp VT 1 iE iC iB iC iB ELECTRICA L Principles and Applications v BE iC I s exp VT iC iB 1 iC iE ENGINEERING I s I ES Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors COMMON-EMITTER CHARACTERISTICS ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors Common-emitter Input Characteristic ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors Common-emitter Output Characteristics ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors LOAD-LINE ANALYSIS OF A COMMONEMITTER AMPLIFIER (Input Circuit) ELECTRICA L ENGINEERING Principles and Applications VBB vin t RBiB t vBE t Chapter 13 Bipolar Junction Transistors LOAD-LINE ANALYSIS OF A COMMONEMITTER AMPLIFIER (Output Circuit) ELECTRICA L ENGINEERING Principles and Applications VCC RC iC vCE Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors When iC becomes zero, we say that the transistor is cutoff. When vCE 0.2 V, we say that the transistor is in saturation. ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors PNP BIPOLAR JUNCTION TRANSISTORS Except for reversal of current directions and voltage polarities, the pnp BJT is almost identical to the npn BJT. ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors LARGE-SIGNAL DC CIRCUIT MODELS (Active-Region Model) ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors LARGE-SIGNAL DC CIRCUIT MODELS (Saturation-Region Model) ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors LARGE-SIGNAL DC CIRCUIT MODELS (Cutoff-Region Model) ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors Analysis of the Fixed Base Bias Circuit RB 200k RC 1k VCC 15V 100 ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors Analysis of the Four-Resistor Bias Circuit ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors 1 RB R1 R2 1 R1 1 R2 VB VCC R2 R1 R2 VB VBE IB RB 1RE ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors I C βI B VCE VCC RC I C RE I E ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors iB t iBQ ib t v BE t VBEQ vbe t ib(t) denotes the signal current flowing into the base, IBQ is the dc current that flows when the signal is absent, and iB(t) is the total base current. Similar notation is used for the other currents and voltages. ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors Small-Signal Equivalent Circuit for the BJT r VT I CQ iC t ib t ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors COMMON-EMITTER AMPLIFIERS ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors 1 RL RL RC 1 RL 1 RC vo RL Av vin r ELECTRICA L ENGINEERING Principles and Applications vo RC Avo vin r Chapter 13 Bipolar Junction Transistors vin 1 Z in iin 1 RB 1 r io Z in Ai Av iin RL ELECTRICA L ENGINEERING Principles and Applications G Ai Av Chapter 13 Bipolar Junction Transistors Z o RC ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors The common-emitter amplifier is inverting and has large voltage gain magnitude, large current gain, and large power gain. ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors EMITTER FOLLOWERS ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors 1 RB R1 R2 1 R1 1 R2 1 RL RL RE 1 RL 1 RE Av 1 RL r 1 RL ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors 1 Zi RB Z it 1 RB 1 Z it vin Z it rπ 1 β RL ib ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors Output Impedance 1 Rs 1 Rs 1 R1 1 R2 vx 1 Zo i x 1 Rs r 1 RE ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors Even though the voltage gain of the emitter follower is less than unity, the current gain and power gain can be large. ELECTRICA L ENGINEERING Principles and Applications Chapter 13 Bipolar Junction Transistors
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