SKY65015-92LF Datasheet, PDF (4/5 Pages) Skyworks Solutions Inc. – InGaP Cascadable Amplifier

DATA SHEET • SKY65015-92LF
Evaluation Board
IS
VS
C4
L2
L3
R₁
Input
C1
L1
VD
C2
Output
The SKY65015 evaluation board comprises the SKY65015
amplifier, the input and output of which are connected via
50 Ω microstrip transmission lines with DC blocking capacitors,
C₁ and C₂, 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 C₄,
L₁, L₂ and R₁. The power supply current, I_S, must be limited,
either via the current limit function of an external bench power
supply, or by replacing L₃ with resistor R₁, the value of which is
given in the Current Limiting Resistor Values table. The evaluation
board is shipped with L₃ in place, which shifts an in-band series
resonance of the supply decoupling network out of band. For low
frequency applications, R₁ 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
SKY65015. 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.
Evaluation Board Parts List
Component
C₁, C₂, C₄
L₁
L₂
R₁
U₁
Description
Capacitor
Inductor
Ferrite bead
Resistor
Amplifier
Value
47 nF
33 nH
18 Ω
Current Limiting Resistor Values
R₁
V_S, V
Resistance, Ω
5
4
6
19
7
33
8
47
9
61
10
76
12
104
Minimum Power
Dissipation Rating, mW
125
125
250
500
500
500
1000
Size
Suggested Part Number
Comments
0603
0603
FBMH4525HM162N-T
0603
For V_S = 6 V
SKY65015
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
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June 8, 2006 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200333 Rev. B