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

Internal Compensation
AVD – Large-Signal Differential
Voltage Amplification – V/mV
7-6
LARGE-SIGNAL DIFFERENTIAL VOLTAGE
AMPLIFICATION AND PHASE SHIFT
vs
FREQUENCY
106
105
104
103
102
101
1
1
10
Phase Shift
Differential
Voltage
Amplification
0°
45°
90°
135°
100 1 k 10 k 100 k 1 M
180°
10 M
f – Frequency – Hz
VCC ± = 5 V to VCC ± = 15 V
RL = 10 kΩ TA = 25°C
Figure 7–5. TL08X Frequency and Time Response Plots
Phase Shift
VO – Output Voltage – mV
28
24
20
16
12
8
4
0
– 4
OUTPUT VOLTAGE
vs
ELAPSED TIME
0 0.2 0.4 0.6 0.8 1.0
t – Elapsed Time – µ s
VCC ± = 15 V RL = 2 kΩ
CL = 100 pF TA = 25°C
The frequency and time-response plots for the TLV277X family of op amps is shown in
Figures 7–6 and 7–7. First, notice that the information is more sophisticated because the
phase response is given in degrees of phase margin; second, both gain/phase plots are
done with substantial loading capacitors (600 pF), so they have some practical value; and
third, the phase margin is a function of power supply voltage.
1.2