Điện tử/Linh kiện điện tử/Trăng-si-tơ/Trăng-si-tơ NPN

NPN Trăng Si Tơ

NPN Transistors is a Semi conductor device made from joining One Positive Typed Seiconductor in between two Neagative Typed Semi conductor . NPN is a Bijunction Semi conductor Device that has three terminals The (B)ase, The (C)ollector, and The (E)mitter

Transistor	Construction	Circuit Symbol	Appearance
NPN Transistor

Tính Chất

Hình I V

$V < V_BE . I = 0$

$V = V_BE . I = 1mA$

$V > V_BE . I = e^v$

$V < V_S . I = I_S$

Dẩn Điện

When the Base voltage is greater than the voltage between the Base and the Emitter Transistor conducts . Base current , Emitter current and Collector current are non zero

$V_B > V_BE$ . I_B, I_E and I_C ≠ 0 . Transistor conducts

When the Base voltage is less than the voltage between the Base and the Emitter Transistor conducts . Base current , Emitter current and Collector current are zero

$V_B < V_BE$ . I_B, I_E and I_C = 0 . Transistor conducts

Trăng Si Tơ Lý Tưởng

Ideal transistor

Amplification does not depend on angular frequency

Emitter's gain equals to collector's gain

Non-ideal transistor

Amplification depends on angular frequency. Amplification decreases with angular frequency.

Emitter's gain is α . Collector's gain β

$\alpha = \frac{\beta}{\beta + 1}$

$\beta = \frac{\alpha}{1 - \alpha}$

Phân Tích

Assume that the transistor is an ideal transistor. When V_B > V_BE the transistor conducts current. I_B is non zero . Therefore I_E and I_C is also non zero and equal to:

I_E = α I_B

I_C = β I_B

Tổng Kết

Công Cụ	Trăng Si Tơ
Cấu Tạo	Tạo từ ghép nối 1 Bán dẩn điện dương giửa 2 Bán dẩn điện âm
Biểu Tượng
Hình I - V
Dẩn Điện	Transistor conducts when VB > VBE