clc1603 Cadeka Microcircuits LLC., clc1603 Datasheet - Page 15
clc1603
Manufacturer Part Number
clc1603
Description
Single And Triple, 1.1ma, 200mhz Amplifers
Manufacturer
Cadeka Microcircuits LLC.
Datasheet
1.CLC1603.pdf
(22 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
clc1603IST6X
Manufacturer:
CADEKA
Quantity:
20 000
Data Sheet
Application Information
Basic Operation
Figures 3, 4, and 5 illustrate typical circuit configurations for
non-inverting, inverting, and unity gain topologies for dual
supply applications. They show the recommended bypass
capacitor values and overall closed loop gain equations.
©2007-2008 CADEKA Microcircuits LLC
Input
Input
Input
Figure 3. Typical Non-Inverting Gain Circuit
Figure 5. Typical Unity Gain (G=1) Circuit
Figure 4. Typical Inverting Gain Circuit
R
R
R
1
g
+
-
g
+V
-V
+
-
s
s
+V
-V
+
-
+V
-V
6.8μF
0.1μF
0.1μF
6.8μF
s
s
s
s
0.1μF
6.8μF
6.8μF
0.1μF
6.8μF
0.1μF
0.1μF
6.8μF
R
f
G = 1
R
f
is required for CFB amplifiers
R
R
f
G = - (R
For optimum input offset
voltage set R
f
G = 1 + (R
R
L
Output
R
f
/R
L
R
g
Output
)
L
1
f
/R
= R
Output
g
f
)
|| R
g
CFB amplifiers can be used in unity gain configurations.
Do not use the traditional voltage follower circuit, where
the output is tied directly to the inverting input. With a CFB
amplifier, a feedback resistor of appropriate value must be
used to prevent unstable behavior. Refer to figure 5 and
Table 1. Although this seems cumbersome, it does allow a
degree of freedom to adjust the passband characteristics.
Feedback Resistor Selection
One of the key design considerations when using a CFB
amplifier is the selection of the feedback resistor, R
used in conjunction with R
non-inverting and inverting circuit configurations. Refer to
figures 3 and 4. As discussed in the Current Feedback
Technology section, the value of the feedback resistor has
a pronounced effect on the frequency response of the
circuit.
Table 1, provides recommended R
values for various gain settings. These values produce
the optimum frequency response, maximum bandwidth
with minimum peaking. Adjust these values to optimize
performance for a specific application. The typical
performance characteristics section includes plots that
illustrate how the bandwidth is directly affected by the
value of R
In general, lowering the value of R
value will extend the bandwidth at the expense of
additional high frequency gain peaking. This will cause
increased overshoot and ringing in the pulse response
characteristics. Reducing R
cause oscillatory behavior.
Increasing the value of R
Lowering the bandwidth creates a flatter frequency
response and improves 0.1dB bandwidth performance.
This is important in applications such as video. Further
increase in R
adversely affect gain flatness.
Gain
(V/V
1
2
5
f
Table 1: Recommended R
at various gain settings.
R
2.5k
1.2k
1.2k
f
(Ω)
f
will cause premature gain rolloff and
R
1.2k
300
g
--
(Ω)
g
to set the gain in the traditional
f
f
±0.1dB BW
will lower the bandwidth.
too much will eventually
(MHz)
f
42
30
8
from the recommended
f
f
vs. Gain
and associated R
www.cadeka.com
-3dB BW
(MHz)
240
200
70
f
. R
f
15
is
g