Intro to BJT Amplifier Circuits. In this Lecture, we will:  Discuss how a BJT is used as a switch (use this as a frame of reference).  Understand the.

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Presentation transcript:

Intro to BJT Amplifier Circuits

In this Lecture, we will:  Discuss how a BJT is used as a switch (use this as a frame of reference).  Understand the concept of an analog signal and the principle of a linear amplifier.  Learn about small signal models (such as the Hybrid Pi model) for the analysis of BJT linear amplifiers.  Investigate how common-emitter and common-base BJT circuits can amplify a small, time-varying input signal.

Voltage Transfer Characteristic for npn Circuit

Voltage Transfer Characteristic for pnp Circuit

NPN Switch Driving a Load

BJT Switches Driving Loads

Digital Logic InverterNOR gate

Bipolar Inverter as a Linear Amplifier

Effect of Improper Biasing on Amplified Signal Waveform (Non-Linear Amplifier)

Simple BJT Amplifier Circuit along with DC Model and AC or Small Signal Model

I B Versus V BE Characteristic (Determination of r  for small signal model)

I C Versus V BE Characteristic (Determination of g m for small signal model)

The Definition of r  and r e and Their Relationship

The Hybrid-π Model (Small-Signal Equivalent Circuit)

Early Voltage/Finite Output Resistance

The Hybrid-π Small-Signal Model with the Resistance r o Included

The T-Model with and without the Resistance r o Included

Expanded Hybrid- Model for npn

h-Parameter Model for npn

BJT Hybrid-  and T Small Signal Models Summarized

Example Problem I

Analysis of Transistor Amplifier Circuits

Transformation of Elements ElementDC ModelAC Model ResistorRR CapacitorOpenC InductorShortL Diode+V , r f –r d = V T /I D Independent Constant Voltage Source + V S -Short Independent Constant Current Source I S Open

Transform This Circuit into a DC Equivalent and AC Equivalent Circuit

Circuits for the Analysis of a Simple Common-Emitter BJT Amplifier

Signal Waveforms in the BJT Amplifier Circuit

Circuits and Signal Waveforms for a Common-Base BJT Amplifier Circuit

Small Signal Equivalent Circuits for a C-E and C-B BJT Amplifier Circuits

Example Problem II

Example Problem III