參數(shù)資料
型號(hào): LT1223CN8
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, PDIP8
封裝: 0.300 INCH, PLASTIC, DIP-8
文件頁數(shù): 9/12頁
文件大小: 290K
代理商: LT1223CN8
9
LT1223
U
S
A
O
PPLICATI
U
U
have about 2.5mV thermal tail on a 10V step. Unfortu-
nately, reducing the input signal and increasing the gain
always results in a thermal tail of about the same amount
for a given output step. For this reason we show separate
graphs of 10mV and 1mV non-inverting amplifier settling
times. Just as the bandwidth of the LT1223 is fairly
constant for various closed-loop gains, the settling time
remains constant as well.
Adjustable Gain Amplifier
To make a variable gain amplifier with the LT1223, vary the
value of R
G
. The implementation of R
G
can be a pot, a light
controlled resistor, a FET, or any other low capacitance
variable resistor. The value of R
F
should not be varied to
change the gain. If R
F
is changed, then the bandwidth will
be reduced at maximum gain and the circuit will oscillate
when R
F
is very small.
LT1223 TA03
+
IN
V
OUT
V
LT1223
R
F
R
G
Adjustable Bandwidth Amplifier
Because the resistance at the inverting input determines
the bandwidth of the LT1223, an adjustable bandwidth
circuit can be made easily. The gain is set as before with
R
F
and R
G
; the bandwidth is maximum when the variable
resistor is at a minimum.
Accurate Bandwidth Limiting The LT1223
It is very common to limit the bandwidth of an op amp by
putting a small capacitor in parallel with R
F
. DO NOT PUT
A SMALL CAPACITOR FROM THE INVERTING INPUT OF
A CURRENT FEEDBACK AMPLIFIER TO ANYWHERE ELSE,
ESPECIALLY NOT TO THE OUTPUT. The capacitor on the
inverting input will cause peaking or oscillations. If you
need to limit the bandwidth of a current feedback amplifier,
use a resistor and capacitor at the noninverting input (R1
& C1). This technique will also cancel (to a degree) the
peaking caused by stray capacitance at the inverting input.
Unfortunately, this will not limit the output noise the way
it does for the op amp.
LT1223 TA04
+
IN
V
OUT
V
LT1223
R
F
5k
R
G
LT1223 TA05
+
IN
V
OUT
V
LT1223
R
F
R
G
R1
R1 = 300
C1 = 100pF
BW = 5MHz
C1
LT1223 TA06
+
IN
V
OUT
V
LT1223
R
F
1k
C
I
OUT
V
IN
V
1
sC R
=
I
I
R
Current Feedback Amplifier Integrator
Since we remember that the inverting input wants to see
a resistor, we can add one to the standard integrator
circuit. This generates a new summing node where we can
apply capacitive feedback. The LT1223 integrator has
excellent large signal capability and accurate phase shift at
high frequencies.
相關(guān)PDF資料
PDF描述
LT1223 Quad 2-input Positive-NOR buffers with open collector outputs 14-SOIC 0 to 70
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