ISL55016_14 Datasheet, PDF (10/11 Pages) Intersil Corporation – MMIC Silicon Bipolar Differential Amplifier

ISL55016
0
-5
-10
EVAL BOARD WITH
-15
MATCHING NETWORK
-20
-25
-30
0
PROBE STATION
0.5G 1.0G 1.5G
2.0G
2.5G
3.0G
FREQUENCY (Hz)
FIGURE 32. |S11| vs FREQUENCY
Thermal Management
The power dissipation of ISL55016 is about 500mW. The
recommended layout is shown in Figure 31. The ground pad
should be placed under the bottom of the device. At least
two thermal vias are needed to lower the temperature.
Choices of Components
ISL55016 is designed for wide bandwidth applications, from
50MHz to 3GHz. The decoupling and RF choke components
should be chosen carefully for different frequency
applications. Tables 1 and 2 list the components used on the
evaluation board.
TABLE 1. LIST OF COMPONENTS (50MHz~300MHz)
FREQUENCY BAND
VALUE
DESCRIPTION/
DIMENSIONS
C1, C2
2200pF
0603
C4, C5
2200pF
0603
L1, L2
2.2µH
Multilayer
Ferrite/0603
C3
1nF
0603
C6
R1, R2
0.1µF
27Ω/0Ω
1206
0402
TABLE 2. LIST OF COMPONENTS (300MHz~3GHz)
FREQUENCY BAND
VALUE
DESCRIPTION/
DIMENSIONS
C1, C2
100pF
0603
C4, C5
100pF
0603
L1, L2
100nH
Surface
Mount/0402
C3
100pF
0603
C6
0.1µF
1206
R1, R2
27Ω/0Ω
0402
Evaluation Board Setup
The Evaluation board is designed to connect directly to the
2-way 180° Power combiner to recombine signals from
-2GHz and allow single-ended assessment with good phase
matching the two differential signals into one single-ended
output. For lower frequencies, a different choice of power
combiner is needed and short matched coaxial cables
should be used to connect to the combiner. This setup is
used on noise figure measurement and differential
OIP2/OIP3 measurements.
+5V
C6
C3
RF_IN
C1
C2
1
6
ISL55016 _R1
2
5
L1
3
4
R2
L2 ^RFOUT
DIFFERENTIAL
C5
1
180°
POWER
SIGNAL
OUTPUT
s
RF ^COMBINER
C4
2
FIGURE 33. EVALUATION BOARD WITH 2-WAY 180° POWER
COMBINER
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10
FN6526.1
June 24, 2008