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OPA660AP Datasheet(PDF) 12 Page - Texas Instruments

Part # OPA660AP
Description  OPERATIONAL TRANSCONDUCTANCE AMPLIFIER AND BUFFER
PDF  20 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

OPA660AP Datasheet(HTML) 12 Page - Texas Instruments

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12
®
OPA660
20
Ω
20
Ω
20
Ω
25
Ω
V
OUT
V
IN
R
1
40.2
Ω
R
2
100k
Ω
CCII
B
E
C
2
8
3
D
1, D2 = 1N4148
R
Q = 1kΩ
• The OTA amplifier works as a current conveyor
(CCII) in this circuit, with a current gain of 1.
•R
1 and C1 set the DC restoration time constant.
•D
1 adds a propagation delay to the DC restoration.
•R
2 and C1 set the decay time constant.
OPA650
C
1
100pF
D
1
D
2
+1
56
• Use low-inductance components. Some film resistors are
trimmed with spiral cuts which increase inductance.
• Use surface-mount components—they generally provide
the lowest inductance.
• A resistor (25
Ω to 200Ω) in series with the buffer and/or
B input may help reduce oscillations and peaking.
• Use series resistors in the supply lines to decouple mul-
tiple devices.
OTA
V
I
B
E
C
V
O
R
5
3
8
2
22
Ω
5
6
R
4
200
Ω
R = 250
(I
20mA)
≈
Q
Ω
Q
G = 1 +
10
R
4
R
5
+1
≈
R
2
R
1
47
Ω
C
1
56
Ω
FIGURE 10. Current-Feedback Amplifier Frequency
Response, G = 10.
FIGURE 9. Current-Feedback Amplifier.
15
10
5
0
–5
–10
–15
–20
–25
1M
10M
100M
1G
Frequency (Hz)
OPA660 CURRENT-FEEDBACK
I
Q = 20mA R1 = 47Ω R2 = 56Ω R4 = 200Ω R5 = 22Ω Gain = 10
20
–30
2.8Vp-p
0.6Vp-p
1.4Vp-p
5Vp-p
0.2Vp-p
–3dB Point
100k
FIGURE 12. High Speed Current Driver (bridge combina-
tion for increased output voltage capability).
FIGURE 13. Cable Amplifier.
OTA
V
I
B
E
C
V
O
R
E
3
8
2
42
Ω
56
+1
150
Ω
150
Ω
50
Ω
R = 250
(I
20mA)
≈
Q
Ω
Q
R
L
G =
+3
≈
R
L
R + r
EE
OTA
B
C
3
8
+IN
2
E
OTA
B
E
3
2
–IN
C
8
R
E
Tuning Coil
Magnetic Head
Driver Transformer
I
O
FIGURE 11. DC Restorer Circuit.



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