參數(shù)資料
型號： LT1223CJ8
廠商： LINEAR TECHNOLOGY CORP
元件分類： 音頻／視頻放大
英文描述： 100MHz Current Feedback Amplifier
中文描述： 1 CHANNEL, VIDEO AMPLIFIER, CDIP8
封裝： 0.300 INCH, HERMETIC SEALED, CERAMIC, DIP-8
文件頁數(shù)： 6/12頁
文件大小： 290K
代理商： LT1223CJ8
6
LT1223
C
HARA TERISTICS
U
A
TYPICAL PERFOR
CE
does in a voltage feedback op amp, the closed-loop
bandwidth does not change. This is because the equiva-
lent gain bandwidth product of the current feedback am-
plifier is set by the Thevenin equivalent resistance at the
inverting input and the internal compensation capacitor.
By keeping R
F
constant and changing the gain with R
G
, the
Thevenin resistance changes by the same amount as the
change in gain. As a result, the net closed-loop bandwidth
of the LT1223 remains the same for various closed-loop
gains.
U
S
A
Current Feedback Basics
O
PPLICATI
U
U
Voltage Gain and Phase vs
Frequency
Total Harmonic Distortion vs
Frequency
2nd and 3rd Harmonic
Distortion vs Frequency
FREQUENCY (Hz)
1M
–30
V
–15
5
20
10M
100M
1G
LT1223 TPC20
R 1k
GAIN
–25
–20
–10
–5
0
10
15
P
–225
–90
90
225
–180
–135
–45
0
45
135
180
PHASE
R = 100
R 1k
R = 100
V = 15V
R
F
= R
G
= 1k
FREQUENCY (Hz)
T
0.01
0.1
10
1k
10k
100k
LT1223 TPC21
0.001
100
THD
V = 15V
V = 7V
R = 400
R
F
= R
G
=1k
RMS
FREQUENCY (MHz)
1
–70
D
–20
10
100
LT1223 TPC22
–60
–50
–40
–30
2ND
3RD
V = 15V
V = 2V
P-P
R = 100
R
= 1k
A = 10dB
Noninverting Amplifier Settling
Time to 10mV vs Output Step
Noninverting Amplifier Settling
Time to 1mV vs Output Step
Inverting Amplifier Settling
Time vs Output Step
SETTLING TIME (ns)
0
–10
O
–4
10
LT1223 TPC23
20
40
60
80
100
–8
–6
–2
0
2
4
6
8
TO 10mV
TO 10mV
A = +1
R
= 1k
V = 15V
R = 1k
SETTLING TIME ( s)
0
–10
O
–4
10
LT1223 TPC24
1
2
–8
–6
–2
0
2
4
6
8
TO 1mV
TO 1mV
A = +1
R = 1k
V = 15V
R = 1k
SETTLING TIME (ns)
0
–10
O
–4
10
LT1223 TPC25
100
–8
–6
–2
0
2
4
6
8
TO 1mV
TO 10mV
A = –1
R = 1k
V = 15V
R = 1k
20
40
60
80
TO 10mV
TO 1mV
The small-signal bandwidth of the LT1223, like all current
feedback amplifiers, isn’t a straight inverse function of the
closed-loop gain. This is because the feedback resistors
determine the amount of current driving the amplifier’s
internal compensation capacitor. In fact, the amplifier’s
feedback resistor (R
F
) from output to inverting input
works with internal junction capacitances of the LT1223 to
set the closed-loop bandwidth.
Even though the gain set resistor (R
G
) from inverting input
to ground works with R
F
to set the voltage gain just like it
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