Analog Electronics Circuits Session 3: Low Frequency response of BJT amplifier Part 1

Analog Electronics Circuits Session 3 covers the following contents:
1. Circuit Diagram of CE BJT amplifier using npn transistor
2. Role of coupling and bypass capacitors
3. DC analysis of BJT voltage divider circuit
4. Small signal model parameters such as rpi, gm and ro
5. AC equivalent circuit
6. Hybrid pi model of BJT
7. Mid-frequency Small signal equivalent circuit of BJT amplifier in CE configuration
8. Estimation of Mid-band voltage gain
9. Low- frequency Small signal equivalent circuit of BJT amplifier in CE configuration
10. Estimation of cut-off frequency due to input coupling capacitor CC1 alone
@InderjitSingh87

[swaritmahalsekar]

Sir, while finding lower cutoff frequency for CC1 why we are short circuiting Cc2, CE and Vs?

[aamir]

Why do we have to bypass the ac signal at the emitter

[oliviaegbert]

Extremely helpful lecture, thank you!!

[swaritmahalsekar]

Sir why we are concerned about low freq.
I remember in my college as well while designing ce amp sir told us to take f = 20hz