Single stage BJT and MOSFET (electronic devices and circuits part 03)

In this article, you will find the Single Stage BJT & MOSFET Amplifiers which will cover the topics such as Concept of amplification with BJT, Transistor as an amplifier, Dynamic Load line, Small signal variations, Transconductance, BJT and Pi-Hybrid model and small signal parameters.

1. Concept of amplification with BJT

Small changes of Vi result in greater variation of Vo, thus gain Vo/Vi is provided
It should be around a bias point V_BE-Q, V_CE-Q

2. The Transistor as an amplifier

VBB is a continuous source that with R B provides a bias point or polarization:

V_g = 0

A variable signal is coupled to V_BB

V_BB + V_g

3. Dynamic load line

Variations in input voltage result in the displacement of the load line:

Small changes in base-emitter voltage and in base current are produced around the bias point of the device
The collector current varies proportionally to the base current (and base-emitter voltage)
There are variations of the collector-emitter voltage (output) amplified related to the input voltage signal

4. Small-signal variations

The relationship between variations of the collector current and changes in the base-emitter voltage (transfer curve).
If there are small variations around the bias point (small signal) a linear approximation of transconductance gm can be established.
Small -signal changes in the transfer function are generalizable to other transistor devices (FET).

5. Transconductance model of BJT: π - Hybrid Model

6. BJT full model: With parasitic capacitances and parasitic resistances (Common-Emitter)

6. BJT simplified model: Without negligible parasitic elements and for low frequency (Common-Emitter)

r_e, r_c → 0, Z_Cs→ ∞
Low frequency: Real(Z_Cπ), Real(Z_Cµ ) → ∞
Still simplifiable: r_b → 0, r_o → ∞

7. π - Hybrid Model (Ebers-Moll Equations)

8. Small Signal Parameters

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