Download EKT104 Analog electronic circuits

[EKT104 ANALOG ELECTRONIC CIRCUITS ]
Sem. 2 2014/2015
Tutorial 3
COMMON COLLECTOR AMPLIFIER AND
IT’S FREQUENCY RESPONSE
For the circuit in Figure 1, given the transistor parameters are 𝛽=120,VEB(on)=0.7 and
VA =50V. Determine the following:
(a)
Equivalent circuit of Hybrid-𝜋 model
(b) Small signal voltage gain, Av
(c)
Find the small signal output resistance, Ro
(d) Lower cut-off frequency,fL
Ro
vo
Figure 1
1
School of Computer and Communication Engineering, UniMAP
[EKT104 ANALOG ELECTRONIC CIRCUITS ]
Sem. 2 2014/2015
COMMON BASE AMPLIFIER
The transistor in ac equivalent circuit shown in Figure 2 has parameters of 𝛽=80 and
VA =∞. Determine the following:
(a)
Voltage gain, Av
(b) Current gain, Ai
(c)
Input resistance, Ri
(d) Suppose that VA =80V, find the output resistance, Ro
Figure 2
2
School of Computer and Communication Engineering, UniMAP