CMOS Differential Amplifier

1
CMOS Differential Amplifier

• Lab 7 2weeks

2
Diff Amp
PMOS Current Mirror
Diff pair
Bias Current
NMOS Current Mirror
SPICE Models NMOS LEVEL2 VTO-0.7 KP5000E-6
LAMBDA0.02 GAMMA0.45 TOX90E-9
NSUB3.7E15 PMOS LEVEL2 VTO0.7 KP400E-6
LAMBDA0.05 GAMMA0.9 TOX90E-9 NSUB3.7E15
3
Current Mirroring (Copy)
Note



Square Law Operation

Observations
4
CurreM4nt Mirroring (Copy)
Note



Square Law Operation

Observations
5
Developing the Bias Current

• Setting biasing Current of Diff Amp, Note
• I R ID6
• VDD -VSS VSG IB RB

R (?ß2VDD - VTN) - ?(2I))/(I?ß)
6
Diff Amp Current Behavior
Starting Eq 1 2
Solving 1 2
7
Diff Amp Testing
Case 1 Vin 0, Io 0 Case 2 -?2x?V lt Vin lt
?2x?V Case 3 Vin gt ?2x?V Io IB
8
Diff Amp Voltage Behavior
9
Diff Amp Voltage Behavior