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KH563 参数 Datasheet PDF下载

KH563图片预览
型号: KH563
PDF下载: 下载PDF文件 查看货源
内容描述: 宽带,低失真驱动器放大器 [Wideband, Low Distortion Driver Amplifier]
分类和应用: 驱动器放大器
文件页数/大小: 13 页 / 261 K
品牌: CADEKA [ CADEKA MICROCIRCUITS LLC. ]
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DATA SHEET  
KH563  
recognize that [taking V positive]  
Equivalent Model  
i
Given that the physical feedback and gain setting  
resistors have been determined in accordance with the  
design equations shown above, an equivalent model may  
be created for the gain to the load where the  
amplifier block is taken as a standard op amp. Figure 5  
shows this analysis model and the resulting gain  
equation to the load.  
V = V + Gi  
R
f
o
err  
solving for V from two directions  
V
= V i R = G +1 i  
R
(
)
i
err  
i
err g  
solving for i from this  
err  
V
i
i
=
err  
G +1 R +R  
(
)
g
i
Vi  
+
Ro  
then  
Classical  
op-amp  
Vo  
V R  
i
i
RL  
-
V
= V −  
i
G +1 R +R  
(
)
g
i
Rf - Ro  
and, substituting for V and i in the original V expression  
err  
o
Rg  
GR R  
f
i
V = V 1+  
o
i
G +1 R +R  
(
)
g
i   
V
R R  
R
R
R
o
f
o
L
f
= 1+  
pulling an  
out of the fraction  
V
R
R +R  
i
g
L
o
g
R
R
i
substitutingin for R andR with their design  
equation yields  
G −  
f
g
V
R
R
o
f
f
A ≡  
= 1+  
v
R
V
i
i
g
G +1+  
V
R
o
L
R
g
= A  
= A (gain to load)  
L
v
V
R +R  
L o  
i
R
R
G
G +1  
f
note that A = 1+  
Figure 5: Equivalent Model  
v
g
This model is used to generate the DC error and noise  
performance equations. As with any equivalent model,  
the primary intent is to match the external terminal  
characteristics recognizing that the model distorts the  
internal currents and voltages. In this case, the model  
would incorrectly predict the output pin voltage swing for  
a given swing at the load. But it does provide a simplified  
means of getting to the external terminal characteristics.  
R = 0  
i
Figure 4: Voltage Gain Derivation  
Note again that if R = 0 this expression would simplify  
i
considerably. Also, if G were very large the voltage gain  
expression would reduce to the familiar non-inverting op  
amp gain equation. These two performance equations,  
shown below, provide a means to derive the design equa-  
tions for R and R given a desired no load gain and out-  
External Compensation Capacitor (C )  
f
g
x
put impedance.  
As shown in the test circuit of Figure 1, the KH563 requires  
an external compensation capacitor from the output to  
pin 19. The recommended values described here assume  
that a maximally flat frequency response into a matched  
Performance Equations  
Design Equations  
load is desired. The required C varies widely with  
x
R
R
the desired value of output impedance and to a lesser  
degree on the desired gain. Note from Figure 2, the  
simplified internal schematic, that the actual total  
compensation (C ) is the series combination of C and  
f
R +R 1+  
R = G +1 R A R  
(
)
f
i
f
o
v
i
g
R R  
R =  
f
o
o
R
R =  
i
g
G +1+  
A 1  
t
x
v
R
g
the internal 10pF from pin 19 to the compensation nodes.  
The total compensation (C ) is developed in two steps as  
shown below.  
t
R
i
G −  
R
R
R
f
f
A = 1+  
v
R
R
i
g
300  
2.0  
G +1+  
C =  
1−  
pF intermediate equation  
pF total compensation  
1
g
R
R
o
g
C
1
C =  
t
1+ 0.02 C  
(
)
1
8
REV. 1A January 2008