Untitled picture.png Consider the amplifier circuit shown in Figure l, comprising of one MOSFET transistor QI
with W/L = 16 and one BJT transistor Q2. The transistors have the small signal model
parameters as provided in the information sheet.
IMO
IKO
Cl=10gF
0.2MO
1.8MO
10k0
C3=10gF
QI
1kO
1kO
Figure 1
1 ov
Q2
C3=1gF
0.1kO
IMO
Cs=20yF
a) Identify the amplifier configuration used in each stage of the amplifier.
Short external capacitors

Stage 1 (Q1)
Input attached to Gate, and output attached to Drain, so the common element is the Source.
Therefore the MOSFET is configured as Common Source

Stage 2 (Q2)
Input attached to Emitter, output attached to Collector, so common element is the Base.
Therefore the BJT is configured as Common Base

At DC, capacitors are opened
b) Calculate the DC biasing drain current in transistor 𝑄1, ﷐𝐼﷮𝐷1﷯, and the collector current in transistor 𝑄2, ﷐𝐼﷮𝐶2﷯.
Untitled picture.png Machine generated alternative text:
IMO
0.2MQ
10k0
lov
1.8MQ
Q2
1k0
1k0

Ink Drawings
Ink Drawings
Ink Drawings
Ink Drawings
Ink Drawings
Ink Drawings

Ink Drawings
Ink Drawings

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