SKY73013-306 Datasheet, PDF (5/7 Pages) Skyworks Solutions Inc. – Direct Quadrature Demodulator 4.9-5.925 GHz Featuring No-Pull LO Architecture

PRELIMINARY DATA SHEET • SKY73013-306
Evaluation Circuit Schematic
VGAIN CONTROL
VCC
Ground
Ground
H2
Enable
C22
VCC
C23
R5
U2
AD8138ARM
VP
R7
VOCM
RF Input +
RF Input -
R1
C1
C2
C4
16 15 14
EN GainC I-
1 R_BIAS
U1
13
I+
N/C 12
2 LNA+
3 LNA-
SKY73013
LO- 11
LO+ 10
R8
V_N
R9
C10
L8
L6
C3
4 GND
CTR2 9
C8
VCC Q+ Q- CTR1
5
6
7
8
L5
R3
VCC
C7 C6
C20
VP
R2
VP
VOCM
Ground
VN
H4
VP
VOCM
VN
C30
V_OCM
R4
U3
AD8138ARM
VN
R6
C25
C25
H1
LO
Input +
LO
Input -
} “I”
BB Out
} “Q”
BB Out
C19
C27
H3
} “I”
BB Out
} “Q”
BB Out
C1, C3, C8, C10 not installed. Zero Ω resistors installed in positions L5, L6, and L8.
U2, U3, and associated components are installed to facilitate nosie figure measurements.
Evaluation Board Test Procedure for Gain,
Quadrature Accuracy, and Input Compression
Use the following testing procedure to set up the SKY73013
evaluation board for testing.
1. Connect a 3.3 V DC power supply to V_CC and either 3.3 V or 0 V
to V_{GAIN CONTROL} (for high or low gain).
2. Connect a 100 Ω balun (recommended: Krytar 4020080 180°
Hybrid, with the Summing port terminated with 50 Ω) to the
RF input input. Connect a vector signal generator to the input
of the balun. Alternatively, at the expense of 3 dB signal loss, it
is possible to drive the RF input single-ended with a 50 Ω
source, as long as the opposite input is terminated with 50 Ω.
Set this source to -20 dBm.
3. Connect a CW sine wave source, at 2/3 the RF frequency, to
the LO. It is less critical to use a balun on this port, although it
is still recommended. Set this source to -15 dBm .
4. Connect oscilloscope probes on the I+, I-, Q+ and Q- pins of
header 1
5. Enable power supply.
6. Enable RF (set to CW) and LO power sources.
7. Observe quadrature amplitude balance and phase accuracy.
8. Adjust RF drive level to observe signal compression.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
200508 Rev. B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 18, 2006
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