clc1605 Cadeka Microcircuits LLC., clc1605 Datasheet - Page 16

• Manufacturer Part Number: clc1605
• Description: Single And Triple, 1.5ghz Amplifers
• Manufacturer: Cadeka Microcircuits LLC.

Data Sheet
Driving Capacitive Loads
Increased phase delay at the output due to capacitive
loading can cause ringing, peaking in the frequency
response, and possible unstable behavior. Use a series
resistance, R
help improve stability and settling performance. Refer to
Figure 6.
Table 2 provides the recommended R
capacitive loads. The recommended R
in <=0.5dB peaking in the frequency response. The
Frequency Response vs. C
response of the CLC1605 Family.
For a given load capacitance, adjust R
tradeoff between settling time and bandwidth. In general,
reducing R
additional overshoot and ringing.
Parasitic Capacitance on the Inverting Input
Physical
unintentional or parasitic resistive, capacitive, and
inductive elements.
Parasitic capacitance at the inverting input can be
especially troublesome with high frequency amplifiers.
A parasitic capacitance on this node will be in parallel
with the gain setting resistor R
impedance can begin to raise the system gain by making
R
©2007-2008 CADEKA Microcircuits LLC
g
Input
appear smaller.
C
1000
L
100
500
20
50
(pF)
R
g
connections
S
Figure 6. Addition of R
+
Table 1: Recommended R
-
S
will increase bandwidth at the expense of
, between the amplifier and the load to
R
f
R
Capacitive Loads
3.3
S
20
15
10
5
(Ω)
R
between
s
L
plot, on page 5, illustrates the
C
L
g
. At high frequencies, its
-3dB BW (MHz)
S
for Driving
components
R
L
S
350
235
170
75
52
vs. C
S
Output
S
to optimize the
S
values result
L
for various
create
In general, avoid adding any additional parasitic
capacitance at this node. In addition, stray capacitance
across the R
frequency ringing. Refer to the Layout Considerations
section for additional information regarding high speed
layout techniques.
Overdrive Recovery
An overdrive condition is defined as the point when either
one of the inputs or the output exceed their specified
voltage range. Overdrive recovery is the time needed for
the amplifier to return to its normal or linear operating
point. The recovery time varies, based on whether the
input or output is overdriven and by how much the range
is exceeded. The CLC1605 Family will typically recover
in less than 10ns from an overdrive condition. Figure 7
shows the CLC1605 in an overdriven condition.
Power Dissipation
Power dissipation should not be a factor when operating
under the stated 1000 ohm load condition. However,
applications with low impedance, DC coupled
should be analyzed to ensure that maximum allowed
junction temperature is not exceeded. Guidelines listed
below can be used to verify that the particular application
will not cause the device to operate beyond it’s intended
operating range.
Maximum power levels are set by the absolute maximum
junction rating of 150°C. To calculate the junction
temperature, the package thermal resistance value
Theta
dissipation.
-0.5
-1.5
1.5
0.5
-1
1
0
JA
0
(Ө
Input
20
JA
) is used along with the total die power
f
Figure 7. Overdrive Recovery
40
resistor can induce peaking and high
60
Output
80
Time (ns)
100
120
140
V
G = 5
160
IN
www.cadeka.com
= 2V
180
pp
200
6
4
2
0
-2
-4
-6
loads
16