
Breif History of Semiconductors
BJT Current components and its working
Transistor Characteristics and its DC Model
BJT voltage divider circuit
BJT Hybrid Pi Model
RECAP , Numerical and Simulation
Basic Concepts and Formulas
Concept Number 1
Concept Number 2
Examples
Input and Output Resistance
Basic Circuit Introduction
Small Signal Model of Basic Circuit
RECAP of Concepts
Basic Circuit Voltage Gain
Input and Output Resistance
Numerical Example
Basic Circuit 2: Input and Output Resistance
Numerical Example
Numerical Example
Biasing
Thermal Runaway
Input Resistance
Voltage Gain
Output Resistance
RECAP
Numerical Example
Bypass Capacitor
Input and Output Resistance and Voltage Gain
Voltage Divider Biasing Circuit
Numerical Example
Explore the frequency response of a BJT circuit, distinguishing internal and external capacitances at low, mid, and high frequencies, and calculate 3 dB frequency from time constants and r equivalent.
Derive the lower cut-off frequency of a common emitter amplifier by building its small signal model, grounding DC sources, shorting capacitors, and finding the equivalent resistance seen by the capacitance.
Apply Miller's theorem to a capacitance between input and output in a common emitter amplifier, splitting it into input and output parts using the midband gain av.
Explore the frequency behavior of a common emitter amplifier, detailing lower and upper cutoff frequencies, emitter node impedance, time-constant based high-frequency limits, and practical implications for bandwidth and gain.
Solve a high-frequency BJT numerical by calculating input and output time constants from capacitances and resistances, then determine c_mu, c_pi, diffusion capacitance, gm, and the upper cutoff frequency.
Analyze a common-emitter amplifier using the small-signal model, derive gain from gm and ro, and verify with LTspice simulations, including beta setting in the transistor model.
Explains the upper cutoff frequency of a BJT common-emitter amplifier using CBe, Cmu, Cjs and the Miller effect to compute input and output capacitances, validated by simulation around 1.1 MHz.
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