"Chapter 1 - The Op Amp's Place in the World" - HTL Wien 10

AVD – Large-Signal Differential Amplification – dB
LARGE-SIGNAL DIFFERENTIAL VOLTAGE
AMPLIFICATION AND PHASE MARGIN
vs
FREQUENCY
100
80
60
40
20
0
–20
–40
100
AVD
Phase
300
240
180
120
60
0
–60
1 k 10 k 100 k 1 M
–90
10 M
f – Frequency – Hz
VDD ± = 5 V RL = 600 kΩ
CL = 600 pF TA = 25°C
φ m – Phase Margin – degrees
Figure 7–6. TLV277X Frequency Response Plots
VO – Output Voltage – mV
VOLTAGE-FOLLOWER
SMALL-SIGNAL PULSE RESPONSE
100
80
60
40
20
0
–20
–40
–60
0 1 2 3 4 5
t – Time – µs
VDD = 2.7 V RL = 600 kΩ
CL = 100 pF TA = 25°C
AV = 1
Figure 7–7. TLV227X Time Response Plots
VO – Output Voltage – mV
AVD – Large-Signal Differential Amplification – dB
100
80
60
40
20
0
–20
AVD
Phase
Voltage-Feedback Op Amp Compensation
Internal Compensation
LARGE-SIGNAL DIFFERENTIAL VOLTAGE
AMPLIFICATION AND PHASE MARGIN
vs
FREQUENCY
300
240
180
120
60
–60
–40 –90
100 1 k 10 k 100 k 1 M 10 M
f – Frequency – Hz
100
80
60
40
20
0
–20
–40
VDD ± = 2.7 V RL = 600 kΩ
CL = 600 pF TA = 25°C
INVERTING SMALL-SIGNAL
PULSE RESPONSE
–60
0 1 2 3 4 5
t – Time – µs
VDD = 2.7 V RL = 600 kΩ
CL = 100 pF TA = 25°C
AV = –1
0
φ m – Phase Margin – degrees
7-7