OPA660 Burr-Brown, OPA660 Datasheet - Page 12

• Manufacturer Part Number: OPA660
• Description: Wide Bandwidth OPERATIONAL TRANSCONDUCTANCE AMPLIFIER AND BUFFER
• Manufacturer: Burr-Brown

• Use low-inductance components. Some film resistors are
• Use surface-mount components—they generally provide
FIGURE 11. DC Restorer Circuit.
FIGURE 12. High Speed Current Driver (bridge combina-
FIGURE 9. Current-Feedback Amplifier.
trimmed with spiral cuts which increase inductance.
the lowest inductance.
+IN
–IN
V
I
R
47
3
®
R = 250
tion for increased output voltage capability).
1
B
Q
3
3
OPA660
B
B
C
1
C
E
E
C
8
2
2
8
OTA
(I
8
C
E
D
R
• The OTA amplifier works as a current conveyor
• R
• D
• R
2
OTA
OTA
Q
(CCII) in this circuit, with a current gain of 1.
1
Q
R
22
, D
1
1
2
= 1k
5
R
56
and C
adds a propagation delay to the DC restoration.
and C
20mA)
R
2
E
= 1N4148
2
1
1
G = 1 +
5
set the DC restoration time constant.
set the decay time constant.
V
IN
+1
I
O
200
R
R
R
Tuning Coil
Magnetic Head
Driver Transformer
20
4
4
5
6
10
5
+1
V
O
6
100pF
C
1
12
D
D
1
2
• A resistor (25 to 200 ) in series with the buffer and/or
• Use series resistors in the supply lines to decouple mul-
FIGURE 13. Cable Amplifier.
FIGURE 10. Current-Feedback Amplifier Frequency
V
I
B input may help reduce oscillations and peaking.
tiple devices.
–10
–15
–20
–25
–30
20
15
10
–5
100k
5
0
I
100k
R
Q
2
50
= 20mA R
20
150
8
Response, G = 10.
C
1
OPA650
3
CCII
3
= 47
1M
OPA660 CURRENT-FEEDBACK
B
25
B
20
E
R
2
2
OTA
C
E
Frequency (Hz)
= 56
8
2
42
R
E
40.2
R = 250
0.2Vp-p
10M
R
Q
R
1
V
4
OUT
= 200
150
5Vp-p
2.8Vp-p
1.4Vp-p
0.6Vp-p
R
L
–3dB Point
(I
5
Q
R
100M
5
20mA)
G =
= 22
+1
R + r
E
Gain = 10
R
L
6
E
1G
V
+3
O