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參數(shù)資料
| 型號： | 6300 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 500mA, 200MHz X DSL LINE DRIVER IN 16-LEAD SSOP PACKAGE |
| 中文描述： | 500mA的，200MHz的X的DSL線路驅(qū)動器，采用16引線SSOP封裝 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大小： | 237K |
| 代理商： | 6300 |
12
LT6300
APPLICATIOU
Another compensation scheme for noninverting circuits is
shown in Figure 10. The circuit is unity gain at low fre-
quency and a gain of 1 + R
F
/R
G
at high frequency. The DC
output offset is reduced by a factor of ten. The techniques
of Figures 9 and 10 can be combined as shown in Fig-
ure11. The gain is unity at low frequencies, 1 + R
F
/R
G
at
mid-band and for stability, a gain of 10 or greater at high
frequencies.
In differential driver applications, as shown on the first
page of this data sheet, it is recommended that the gain
setting resistor be comprised of two equal value resistors
connected to a good AC ground at high frequencies. This
ensures that the feedback factor of each amplifier remains
less than 0.1 at any frequency. The midpoint of the
resistors can be directly connected to ground, with the
resulting DC gain to the V
OS
of the amplifiers, or just
bypassed to ground with a 1000pF or larger capacitor.
W
U
U
Line Driving Back-Termination
The standard method of cable or line back-termination is
shown in Figure 12. The cable/line is terminated in its
characteristic impedance (50
, 75
, 100
, 135
, etc.).
A back-termination resistor also equal to the chararacteristic
impedance should be used for maximum pulse fidelity of
outgoing signals, and to terminate the line for incoming
signals in a full-duplex application. There are three main
drawbacks to this approach. First, the power dissipated in
the load and back-termination resistors is equal so half of
the power delivered by the amplifier is wasted in the
termination resistor. Second, the signal is halved so the
gain of the amplifer must be doubled to have the same
overall gain to the load. The increase in gain increases
noise and decreases bandwidth (which can also increase
distortion). Third, the output swing of the amplifier is
doubled which can limit the power it can deliver to the load
for a given power supply voltage.
An alternate method of back-termination is shown in
Figure 13. Positive feedback increases the effective back-
termination resistance so R
BT
can be reduced by a factor
+
–
6300
F10
R
F
R
G
V
i
V
O
C
C
< 5MHz
1
2
π
R
G
C
C
R
G
≤
R
F
/9
= 1 (LOW FREQUENCIES)
(HIGH FREQUENCIES)
V
O
V
I
= 1 +R
F
R
G
Figure 10. Alternate Noninverting Compensation
R
C
V
O
V
I
C
C
+
–
6300
F11
R
F
R
G
C
BIG
R
F
R
G
= 1 AT LOW FREQUENCIES
= 1 +
AT MEDIUM FREQUENCIES
R
F
(R
C
|| R
G
)
= 1 +
AT HIGH FREQUENCIES
V
O
V
I
Figure 11. Combination Compensation
+
–
6300
F12
R
F
R
BT
CABLE OR LINE WITH
CHARACTERISTIC IMPEDANCE R
L
R
G
V
O
V
I
R
L
(1 + R
F
/R
G
)
=
V
O
V
I
1
2
R
BT
= R
L
Figure 12. Standard Cable/Line Back Termination
+
–
6300
F13
R
F
R
BT
R
P2
R
P1
R
G
V
I
V
A
V
P
V
O
R
L
R
F
R
G
1 +
(
R
L
n
=
V
O
V
I
= 1 –
–
1
n
FOR R
BT
=
)
R
F
R
G
1 +
(
)
R
P1
R
P1
+ R
P2
R
P1
R
P2
+ R
P1
R
P2
/(R
P2
+ R
P1
)
1 + 1/n
(
)
Figure 13. Back Termination Using Postive Feedback
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