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參數資料
| 型號： | LM6104M |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運算放大器 |
| 英文描述： | Quad Gray Scale Current Feedback Amplifier |
| 中文描述： | QUAD OP-AMP, 30000 uV OFFSET-MAX, 7.5 MHz BAND WIDTH, PDSO14 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-14 |
| 文件頁數： | 4/6頁 |
| 文件大小： | 118K |
| 代理商： | LM6104M |
Applications Information
CURRENT FEEDBACK TOPOLOGY
The small-signal bandwidth of conventional voltage feed-
back amplifiers is inversely proportional to the closed-loop
gain based on the gain-bandwidth concept. In contrast, the
current feedback amplifier topology, such as the LM6104,
enables a signal bandwidth that is relatively independent of
the amplifier’s gain (see typical curve Frequency Response
vs Closed Loop Gain).
FEEDBACK RESISTOR SELECTION: R
F
Current feedback amplifier bandwidth and slew rate are
controlled by R
F
. R
F
and the amplifier’s internal compensa-
tion capacitor set the dominant pole in the frequency re-
sponse. The amplifier, therefore, always requires a feed-
back resistor, even in unity gain.
Bandwidth and slew rate are inversely proportional to the
value of R
F
(see typical curve Frequency Response vs R
F
).
This makes the amplifier especially easy to compensate for
a desired pulse response (see typical curve Large Signal
Pulse Response). Increased capacitive load driving capabili-
ty is also achieved by increasing the value of R
F
.
The LM6104 has guaranteed performance with a feedback
resistor of 2 k
X
.
CAPACITIVE FEEDBACK
It is common to place a small lead capacitor in parallel with
feedback resistance to compensate voltage feedback am-
plifiers. Do not place a capacitor across R
F
to limit the band-
width of current feedback amplifiers. The dynamic imped-
ance of capacitors in the feedback path of the LM6104, as
with any current feedback amplifier, will cause instability.
4
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