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參數資料
| 型號： | LT1228 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 100MHz Current Feedback Amplifier with DC Gain Control(100MHz ，電流反饋放大器（帶直流增益控制）) |
| 中文描述： | 100MHz的電流反饋放大器的直流增益控制（100MHz時，電流反饋放大器（帶直流增益控制）） |
| 文件頁數： | 12/20頁 |
| 文件大?。?/td> | 357K |
| 代理商： | LT1228 |
LT1228
12
the family of curves that result from various values of the
feedback resistor. These curves use a solid line when the
response has less than 0.5dB of peaking and a dashed line
for the response with 0.5dB to 5dB of peaking. The curves
stop where the response has more than 5dB of peaking.
Current Feedback Amp Small-Signal Response
V
S
=
±
15V, R
F
= R
G
= 750
, R
L
= 100
At a gain of two, on
±
15V supplies with a 750
feedback
resistor, the bandwidth into a light load is over 160MHz
without peaking, but into a heavy load the bandwidth
reduces to 100MHz. The loading has so much effect
because there is a mild resonance in the output stage that
enhances the bandwidth at light loads but has its Q
reduced by the heavy load. This enhancement is only
useful at low gain settings, at a gain of ten it does not boost
the bandwidth. At unity gain, the enhancement is so
effective the value of the feedback resistor has very little
effect on the bandwidth. At very high closed-loop gains,
the bandwidth is limited by the gain-bandwidth product of
about 1GHz. The curves show that the bandwidth at a
closed-loop gain of 100 is 10MHz, only one tenth what it
is at a gain of two.
Capacitance on the Inverting Input
Current feedback amplifiers want resistive feedback from
the output to the inverting input for stable operation. Take
care to minimize the stray capacitance between the output
and the inverting input. Capacitance on the inverting input
to ground will cause peaking in the frequency response
(and overshoot in the transient response), but it does not
degrade the stability of the amplifier. The amount of
capacitance that is necessary to cause peaking is a func-
tion of the closed-loop gain taken. The higher the gain, the
more capacitance is required to cause peaking. For ex-
ample, in a gain of 100 application, the bandwidth can be
increased from 10MHz to 17MHz by adding a 2200pF
capacitor, as shown below. C
G
must have very low series
resistance, such as silver mica.
LT1228 TA08
–
+
C
G
R
G
5.1
R
F
510
V
OUT
CFA
V
IN
6
1
8
Boosting Bandwidth of High Gain Amplifier
with Capacitance On Inverting Input
49
FREQUENCY (MHz)
1
19
G
22
25
28
31
46
10
100
LT1228 TA09
34
37
40
43
C
G
= 4700pF
C
G
= 2200pF
C
G
= 0
U
S
A
O
PPLICATI
U
U
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| LT1228CN8 | 功能描述:IC CURRNT FEEDBCK AMP100MHZ 8DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:73 系列:Over-The-Top® 放大器類型:通用 電路數:4 輸出類型:滿擺幅 轉換速率:0.07 V/µs 增益帶寬積:200kHz -3db帶寬:- 電流 - 輸入偏壓:1nA 電壓 - 輸入偏移:285µV 電流 - 電源:50µA 電流 - 輸出 / 通道:25mA 電壓 - 電源，單路/雙路(±):2 V ~ 44 V，±1 V ~ 22 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WFDFN 裸露焊盤 供應商設備封裝:16-DFN-EP（5x3） 包裝:管件 |
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