DATA SHEET • SKY65013-92LF
Evaluation Board
I
S
V
S
C
4
L
2
L
3
R
1
The SKY65013 evaluation board comprises the SKY65013
amplifier, the input and output of which are connected via
50
Ω
microstrip transmission lines with DC blocking capacitors,
C
1
and C
2
, to the input and output SMA connectors, respectively.
The positive supply voltage, V
S
, is connected to pin 6, RF Output
of the amplifier via the decoupling network which consists of C
4
,
L
1
, L
2
and R
1
. The power supply current, I
S
, must be limited,
either via the current limit function of an external bench power
supply, or by replacing L
3
with resistor R
1
, the value of which is
given in the Current Limiting Resistor Values table. The evaluation
board is shipped with L
3
in place, which shifts an in-band series
resonance of the supply decoupling network out of band. For low
frequency applications, R
1
may be used to conveniently limit
supply current on the evaluation board.
The evaluation board also contains a probe fixture which
facilitates the direct measurement of the s parameters of the
SKY65013. The probe fixture comprises a very short coplanar
waveguide (CPW) transmission line to pin 3 and an identical line
to pin 6. All other pins of the amplifier are grounded. The CPW
transmission lines are compatible with ground-signal-ground
wafer probe tips, which can be connected to the RF ports of a
vector network analyzer (VNA) via coaxial cables. The very small
electrical length of these CPW transmission lines obviates the
need to de-embed their effects from the s parameters that are
measured. The supply constant current must be applied via the
bias tee, which is typically integrated into the VNA, which is cas-
cade with the output pin of the amplifier.
L
1
Input
C
1
V
D
C
2
Output
Evaluation Board Parts List
Component
C
1
, C
2
, C
4
L
1
L
2
R
1
U
1
Description
Capacitor
Inductor
Ferrite bead
See Current Limiting
Resistor Values Table
Amplifier
0603
SKY65013
Value
47 nF
33 nH
Size
0603
0603
FBMH4525HM162N-T
Suggested Part Number
Comments
Current Limiting Resistor Values
V
S
, V
4
4.6
5
6
8
9
10
12
R
1
Resistance,
Ω
13
28
38
63
113
138
163
213
Minimum Power
Dissipation Rating, mW
125
125
125
125
250
500
500
500
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
4
June 8, 2006 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200359 Rev. B
SKYWORKS [ SKYWORKS SOLUTIONS INC. ]
