Electronics I · Digital lecture note

Small Signal Models (review) – BJT small-signal models and amplifiers

Elektronik I – Small Signal Models (tekrar) – BJT küçük işaret modelleri ve yükselteçler

Course: Electronics I
Semester: Semester 4 · Spring 2022–23
Format: PDF · 6 pages · 0.1 MB · handwriting-style LaTeX
Language: Turkish
Original note: Elektronik-1-small-signal-model-tekrar.pdf

Open the PDF (0.1 MB)LaTeX source (.tex)Original handwritten note

Small Signal Models (review) – BJT small-signal models and amplifiers – first page of the digital lecture note

Notice: The digital notes were created from the handwritten notes with the help of Claude (Anthropic); they are meant as a supplementary resource and may contain errors. Always rely on the original notes and the official course materials.

What is in this note?

Section headings of the note (in Turkish):

Small signal Models
πpi model
Small signal model
T model
Amplifier Topologies
Common Emitter Amplifier
Small signal circuit
Common Emitter Amplifier with R_ERE
with πpi model

Text of the note

Show as plain text (Turkish; formulas and drawings are not included)

Small signal Models

Small signal model:

r_o → output resistance of bjt r_o = |V_A|I_C

Common Emitter with R_E

Common-Collector (Emitter-Foll.)

Common Emitter Amplifier

C are open circuit at DC ac sources short circuit

Now all caps are short circuit

DC voltage sources are short circuit

DC current sources are open circuit

Small signal circuit

→ Moderate Input Resistance 'in büyük olmasını isteriz çok büyük olursa R_sig ihmal edilebilecek kadar küçük olur.

ve daha yüksek kazanç sağlanır.

R_out 'un küçük olmasını isteriz böylece üzerinde voltaj düşümü azalır ve singal daha kazançlı

bir şekilde çıkışa aktarılabilir.

Common Emitter Amplifier with R_E RE

with π pi model

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