SKY65015-214LF Datasheet, PDF (4/5 Pages) Skyworks Solutions Inc. – InGaP General-Purpose Amplifier LF-6 GHz

DATA SHEET • SKY65015-214LF
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 3, 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 1 and an identical line
to pin 3. 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
cascade with the output pin of the amplifier.
Evaluation Board Parts List
Component
C₁, C₂, C₄
L₁
L₂
R₁
U₁
Description
Value
Size
Capacitor
47 nF
0603
Inductor
33 nH
0603
Ferrite bead
Resistor
See Current Limiting
0603
Resistor Values Table
Amplifier
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
Suggested Part Number
FBMH4525HM162N-T
SKY65015
Comments
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
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April 7, 2006 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200399 Rev. C