SKY73021_08 Datasheet, PDF (11/18 Pages) Skyworks Solutions Inc. – 1700 – 2200 MHz High Gain and Linearity Diversity Downconversion Mixer for 2G/3G Base Station Transceiver Applications

DATA SHEET • SKY73021 DOWNCONVERSION MIXER
Evaluation Board Description
The SKY73021 Evaluation Board is used to test the performance
of the SKY73021 downconversion mixer. An assembly drawing for
the Evaluation Board is shown in Figure 36 and the layer detail is
provided in Figure 37.
Circuit Design Configurations
The following design considerations are general in nature and
must be followed regardless of final use or configuration:
1. Paths to ground should be made as short and as low
impedance as possible.
2. The ground pad of the SKY73021 provides critical electrical
and thermal functionality. This pad is the main thermal
conduit for heat dissipation. Since the circuit board acts as
the heat sink, it must shunt as much heat as possible from
the device. Therefore, design the connection to the ground
pad to dissipate the maximum heat produced by the circuit
board. For more information on soldering the SKY73021, refer
to the Package and Handling Information section of this Data
Sheet.
3. Skyworks recommends including external bypass capacitors
on the VCC voltage inputs of the device.
4. Components L5, L6, L14, and L15 (see Figure 38) are high-Q,
low loss inductors. These inductors must be able to pass
currents in excess of 200 mA DC.
5. Components R1 and R2 (see Figure 38) allow for external
adjustment of the IF amplifier bias points. For operation as
specified in Tables 3 and 4, these resistors are not required.
A schematic diagram for the SKY73021 Evaluation Board is
shown in Figure 38.
J9
J5
J4
J1
J7
C34
C35 C29
C28
L16 L17 _R4
L13 L12
C25
L1
C2 L2
C32
T2
C33
C26 ^C39
R2
C24 _L11
J8
C3
L14
C38
L15 _C27
R5
C1
C4
C5
C8
C23
C20
C22
C21
J2
C17
C7
C6 L4
C41
L5
R6 R1
L6 ^C14
C40
C18
C13
L10
L3
C12
T1
C11
C19
J3
R3
L18 L19
L8 L9
C36 C37
C15 C16
J10
J6
S905
Figure 36. SKY73021 Evaluation Board Assembly Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
200450E • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • May 13, 2008
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