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CMOS Differential Amplifier. Lab 7 2weeks. Diff Amp. PMOS Current Mirror. Diff pair. Bias Current. NMOS Current Mirror. SPICE Models: NMOS LEVEL=2 +VTO=-0.7 KP=5000E-6 LAMBDA=0.02 GAMMA=0.45 +TOX=90E-9 NSUB=3.7E15

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Presentation Transcript
diff amp
Diff Amp

PMOS

Current Mirror

Diff pair

Bias Current

NMOS Current Mirror

SPICE Models:

NMOS LEVEL=2 +VTO=-0.7 KP=5000E-6 LAMBDA=0.02 GAMMA=0.45 +TOX=90E-9 NSUB=3.7E15

PMOS LEVEL=2 +VTO=0.7 KP=400E-6 LAMBDA=0.05 GAMMA=0.9 +TOX=90E-9 NSUB=3.7E15

current mirroring copy

Note

Current Mirroring (Copy)

;

;

Square Law Operation–

Observations

curre m4 nt mirroring copy

Note

CurreM4nt Mirroring (Copy)

;

;

Square Law Operation–

Observations

developing the bias current
Developing the Bias Current
  • Setting biasing Current of Diff Amp, Note:
  • I R = ID6
  • VDD -VSS= VSG + IB RB;

R = (ß·2VDD - VTN) - (2·I))/(I·ß)

diff amp current behavior
Diff Amp Current Behavior

Starting Eq 1 & 2

Solving 1 & 2

diff amp testing
Diff Amp Testing

Case 1 Vin = 0, Io = 0

Case 2 -2xV < Vin < +2xV

Case 3 Vin > | 2xV|; Io = IB