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Differential Amplifiers

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Differential Amplifiers. Prof. Paul Hasler. Differential ... Amp Gain = Av. Solving: Vout ~ Vin. Differential Pairs / Amplifiers. Differential Transistor Pairs ... – PowerPoint PPT presentation

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Title: Differential Amplifiers


1
Differential Amplifiers
  • Prof. Paul Hasler

2
Differential Transistor Pairs
MOSFET Diff-Pair
BJT Diff-Pair
3
Differential Transistor Pairs
MOSFET Diff-Pair
BJT Diff-Pair
The bottom transistor (the one with Ibias) sets
the total current
4
Differential Transistor Pairs
MOSFET Diff-Pair
BJT Diff-Pair
The bottom transistor (the one with Ibias) sets
the total current
The upper two transistors compete for a fraction
of this current
5
Analysis of Diff-Pair
6
Analysis of Diff-Pair
7
Analysis of Diff-Pair
8
Analysis of Diff-Pair
9
Analysis of Diff-Pair
10
Analysis of Diff-Pair
Source of Common-Mode Gain
11
Analysis of Diff-Pair
12
Analysis of Diff-Pair
13
Differential Pair Currents
3
Iout
Iout-
2.5
2
(nA)
1.5
Output current
1
0.5
0
-0.
4
-0.
3
-0.
2
-0.
1
0
0.1
0.2
0.3
0.4
Differential input
voltage (V)
14
Transistor Leg Currents
15
Transistor Leg Currents
16
BJT Differential Pair Analysis

-
Iout
Iout
V1
V2
Vb
GND
17
BJT Differential Amplifier

-
Iout
Iout
V1
V2
Vb
GND
18
BJT Differential Amplifier
V1
V2
Vb
GND
19
BJT Differential Amplifier
Fixed output voltage Current output
Zero output current Voltage output
V1
V2
Vb
GND
20
Basic Differential Amplifier
21
Transfer Functions
22
Wide-Output Range Differential Amplifier
Simple differential amplifer
"Vmin" effect
23
Wide-Output Range Differential Amplifier
Wide-output range amplifier
24
Wide-Output Range Differential Amplifier
Wide-output range amplifier
25
A Unity-Gain Follower
26
A Unity-Gain Follower
27
A Unity-Gain Follower
Amp Gain Av
Av
Solving Vout Vin
1 Av
A more ideal Follower / Buffer Circuit
28
A Unity-Gain Follower
Amp Gain Av
Solving Vout Vin
29
A Unity-Gain Follower
Amp Gain Av
Solving Vout Vin
30
Differential Pairs / Amplifiers
  • Differential Transistor Pairs
  • Differential Amplifiers
  • Unity-Gain Amplifiers
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