DATA SHEET
SKY73089-11: 1200 – 1700 MHz High Gain and Linearity
Diversity Downconversion Mixer
Applications
Description
• 2G/3G base station transceivers:
− GSM/EDGE, CDMA, UMTS/WCDMA
The SKY73089-11 is a fully integrated diversity mixer that
includes Local Oscillator (LO) drivers, an LO switch, high linearity
mixers, and large dynamic range Intermediate Frequency (IF)
amplifiers. Low loss RF baluns have also been included to reduce
design complications and lower system cost.
• Land mobile radio
• High performance radio links
Features
• Operating frequency range: 1200 to 1700 MHz
• IF frequency range: 50 to 500 MHz
• Conversion gain: 9.3 dB
• Input IP3: +26.8 dBm
• Output IP3: +36.1 dBm
• Noise Figure: 9.3 dB
• Integrated LO drivers
• Integrated low loss RF baluns
• High linearity IF amplifiers
• On-chip SPDT LO switch (greater than 40 dB LO-to-LO isolation)
The SKY73089-11 features an input IP3 of +26.8 dBm and a
Noise Figure (NF) of 9.3 dB, making the device an ideal solution
for high dynamic range systems such as 2G/3G base station
receivers. The LO switch provides more than 40 dB of isolation
between LO inputs and supports the switching time required for
GSM/EDGE base stations.
The SKY73089-11 is manufactured using a robust silicon BiCMOS
process and has been designed for optimum long-term reliability.
The SKY73089-11 diversity downconversion mixer is provided in
a compact, 36-pin Multi-Chip Module (MCM). A functional block
diagram is shown in Figure 1. The pin configuration and package
are shown in Figure 2. Signal pin assignments and functional pin
descriptions are provided in Table 1.
• Small, MCM (36-pin, 6 x 6 mm) package (MSL3, 260 °C per
JEDEC J-STD-020)
Figure 1. SKY73089-11 Block Diagram
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DATA SHEET • SKY73089-11 DOWNCONVERSION MIXER
Figure 2. SKY73089-11 Pinout – 36-Pin MCM
(Top View)
Table 1. SKY73089-11 Signal Descriptions
Pin #
Name
Description
Pin #
Name
Description
1
RFA
RF channel A input
19
LO1
Local oscillator #1 input
2
NC
No connect
20
GND
Ground
3
GND
Ground
21
VCC5
DC supply, +5 V
4
VCC1
DC supply, +5 V
22
GND
Ground
5
GND
Ground
23
LO_SEL
Local oscillator switch select
6
VCC2
DC supply, +5 V
24
GND
Ground
7
GND
Ground
25
GND
Ground
8
NC
No connect
26
GND
Ground
9
RFB
RF channel B input
27
LO2
Local oscillator #2 input
10
VCC3
DC supply, +5 V
28
NC
No connect
11
NC
No connect
29
RIFA
IF channel A bias control
12
GND
Ground
30
VCC6
DC supply, +5 V
13
IFB+
IF channel B positive output
31
NC
No connect
14
IFB–
IF channel B negative output
32
IFA+
IF channel A positive output
15
NC
No connect
33
IFA–
IF channel A negative output
16
VCC4
DC supply, +5 V
34
GND
Ground
17
RIFB
IF channel B bias control
35
NC
No connect
18
NC
No connect
36
VCC7
DC supply, +5 V
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Functional Description
The SKY73089-11 is a high gain diversity mixer, optimized for
base station receiver applications. The device consists of two
diversity channels, each consisting of a low loss RF balun, high
linearity passive mixer, and a low noise IF amplifier.
LO amplifiers are also included that allow the SKY73089-11 to
connect directly to the output of a Voltage Controlled Oscillator
(VCO). This eliminates the extra gain stages needed by most
discrete passive mixers. A Single Pole, Double Throw (SPDT)
switch has been included to select between two different LO
inputs for frequency hopping applications (i.e., GSM).
RF Baluns and Passive Mixer
The RF baluns provide a single ended input, which can easily be
matched to 50 Ω using a simple matching circuit. The RF
baluns offer very low loss and excellent amplitude and phase
balance.
The high linearity mixer is a passive, double balanced mixer that
provides a very low insertion loss, and excellent 3rd Order Input
Insertion Point (IIP3) and linearity performance.
Additionally, the balanced nature of the mixer provides for
excellent port-to-port isolation.
LO Buffers and SPDT LO Switch
For applications that do not require frequency hopping, LO_SEL
is fixed to one state and the appropriate LO input is used.
IF Amplifier
The SKY73089-11 includes high dynamic range IF amplifiers
that follow the passive mixers in the signal path. The outputs
require a supply voltage connection using inductive chokes.
These choke inductors should be high-Q and have the ability to
handle 200 mA or greater.
A simple matching network allows the output ports to be
matched to a balanced 200 Ω impedance. The IF amplifiers are
optimized for IF frequencies between 50 and 500 MHz. The IF
amplifiers can be operated outside of this range, but with a
slight degradation in performance.
Electrical and Mechanical Specifications
The absolute maximum ratings of the SKY73089-11 are
provided in Table 2. The recommended operating conditions are
specified in Table 3 and electrical specifications are provided in
Table 4.
Spurious suppression measurements are provided in Table 5.
Typical performance characteristics of the SKY73089-11 are
illustrated in Figures 3 through 29.
The LO buffers allow the input power of the SKY73089-11 to be
programmed in the range of –6 to +6 dBm. The LO section has
been optimized for high-side LO injection. However, the LO can
be driven over a wide frequency range with only slight
degradation in performance.
A high isolation SPDT switch allows the SKY73089-11 to be
used for frequency hopping applications. This switch provides
greater than 60 dB of LO1 to LO2 isolation:
LO_SEL Logic:
State:
High
LO1 enabled
Low
LO2 enabled
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Table 2. SKY73089-11 Absolute Maximum Ratings
Parameter
Symbol
Supply voltage, +5 V (VCC1 – VCC7)
VCC
Supply current
ICC
RF input power
PRF
LO input power
PLO
Operating case temperature
TC
Junction temperature
TJ
Storage case temperature
TSTG
Minimum
Typical
Maximum
Units
4.5
5.0
5.5
V
370
0
–40
–40
430
mA
+20
dBm
+20
dBm
+85
°C
+150
°C
+125
°C
Notes: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
parameters set at or below their nominal value. Exceeding any of the limits listed here may result in permanent damage to the device.
Nominal thermal resistance (junction to center ground pad) is 5.1 °C/W.
CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device
must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body
or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times.
Table 3. SKY73089-11 Recommended Operating Conditions
Parameter
Symbol
Minimum
Typical
Maximum
Units
RF frequency range
FRF
1200
1700
MHz
LO frequency range (Note 1)
FLO
1250
2150
MHz
IF frequency range
FIF
50
450
MHz
Supply voltage, +5 V (VCC1 – VCC7)
VCC
Supply current
ICC
LO input power
PLO
–6
LO select logic:
high
low
LO_SELH
LO_SELL
2.2
Operating case temperature
TC
–40
4.75
5.00
5.25
370
0
+6
dBm
0.8
V
V
+85
°C
Note 1: The SKY73089-11 has been optimized for high-side LO injection. However, the LO can be used outside of the specified frequency range with degraded performance.
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V
mA
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Table 4. SKY73089-11 Electrical Specifications (Note 1)
(Voltage Supply = +5 V, TC = +25 °C, LO = 0 dBm, RF Frequency = 1445 MHz, IF Frequency = 350 MHz, LO Frequency = 1795 MHz, Unless
Otherwise Noted)
Parameter
Symbol
Min
Typical
8.6
9.3
dB
–40 °C to +85 °C
±0.6
dB
NF
–40 °C to +85 °C
±0.8
Noise Figure with a blocker signal
NFBLK
Blocking signal input
power = +8 dBm
Third order input intercept point
IIP3
FRF = 1445 and
1445.8 MHz,
PRF = –10 dBm/each tone
Third order input intercept point variation
over temperature
IIP3
Third order output intercept point
Conversion gain
G
Conversion gain variation over temperature
G
Noise Figure
NF
Noise Figure variation over temperature
Test Condition
9.3
Max
11.0
dB
dB
25
dB
+26.8
dBm
–40 °C to +85 °C
±0.5
dB
OIP3
FRF = 1445 and
1445.8 MHz,
PRF = –10 dBm/each tone
+36.1
dBm
2LO – 2RF
2x2
PRF = –10 dBm
–71
–60
dBc
3LO – 3RF
3x3
PRF = –10 dBm
–83
–70
dBc
Input 1 dB compression point
IP1dB
Input 1 dB compression point variation over
temperature
IP1dB
Output 1 dB compression point
OP1dB
+24.0
Units
+11.7
–40 °C to +85 °C
+13.9
dBm
±0.6
dB
+22.2
dBm
LO1 to LO2 isolation
40
49
dB
Channel-to-channel isolation
46
54
dB
RF to IF isolation
60
67
dB
LO leakage:
1xLO to RF port
2xLO to RF port
3xLO to RF port
4xLO to RF port
1xLO to IF port
LO_SEL input
–20
LO switching time
–28
–22
–52
–68
–62
–25
–20
–32
–50
–30
dBm
dBm
dBm
dBm
dBm
+150
+250
µA
1.0
µs
RF port input return loss
ZIN_RF
With external matching
components
14
dB
LO port input return loss
ZIN_LO
With external matching
components
14
dB
IF port input return loss
ZOUT_IF
With external matching
components
14
dB
Note 1: Performance is guaranteed only under the conditions listed in this Table.
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DATA SHEET • SKY73089-11 DOWNCONVERSION MIXER
Table 5. SKY73089-11 Spur Suppression Measurements, 3GPP Bands #11 and 21 (Note 1)
Parameter
Symbol
4RF-3LO
4X3
6RF-5LO
Test Condition
Min
Typical
Max
Units
PRF = 0 dBm,
FRF = 1440 MHz, IF spur
frequency = 375 MHz
–98
–85
dBc
6X5
PRF = 0 dBm,
FRF = 1445 MHz, IF spur
frequency = 305 MHz
–112
–85
dBc
7RF-6LO
7X6
PRF = 0 dBm,
FRF = 1480 MHz, IF spur
frequency = 410 MHz
–122
–85
dBc
9RF-7LO
9X7
PRF = 0 dBm,
FRF = 1430 MHz, IF spur
frequency = 305 MHz
–119
–85
dBc
10RF-8LO
10X8
PRF = 0 dBm,
FRF = 1400 MHz, IF spur
frequency = 360 MHz
–114
–85
PRF = 0 dBm,
FRF = 1465 MHz, IF spur
frequency = 290 MHz
–120
–85
dBc
Note 1: Performance is guaranteed only under the conditions listed in this Table.
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Typical Performance Characteristics
(Voltage Supply = +5 V, TC = +25 °C, LO = 0 dBm, RF Frequency = 350 MHz, IF Frequency = 90 MHz, LO Frequency = 440 MHz, Unless
Otherwise Noted)
Figure 3. Channel A Gain Over Frequency and Supply Voltage
Figure 4. Channel B Gain Over Frequency and Supply Voltage
Figure 5. Channel A Gain Over Frequency and Temperature
Figure 6. Channel B Gain Over Frequency and Temperature
Figure 7. Channel A Gain Over Frequency and LO Power
Figure 8. Channel B Gain Over Frequency and LO Power
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DATA SHEET • SKY73089-11 DOWNCONVERSION MIXER
Figure 9. Channel A IIP3 Over Frequency and Supply Voltage
Figure 10. Channel B IIP3 Over Frequency and Supply Voltage
Figure 11. Channel A IIP3 Over Frequency and Temperature
Figure 12. Channel B IIP3 Over Frequency and Temperature
Figure 13. Channel A IIP3 Over Frequency and LO Power
Figure 14. Channel B IIP3 Over Frequency and LO Power
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Figure 15. Channel A Noise Figure Over Frequency and
Temperature
Figure 16. Channel B Noise Figure Over Frequency and
Temperature
Figure 17. Channel A IP1dB Over Frequency and Temperature
Figure 18. Channel B IP1dB Over Frequency and Temperature
Figure 19. Channel A 2x2 Over Frequency and Temperature
Figure 20. Channel B 2x2 Over Frequency and Temperature
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DATA SHEET • SKY73089-11 DOWNCONVERSION MIXER
Figure 21. Channel A 3x3 Over Frequency and Temperature
Figure 22. Channel B 3x3 Over Frequency and Temperature
Figure 23. Channel-to-Channel Isolation Over Frequency and
Temperature
Figure 24. Channel A LO to IF Leakage Over Frequency and
Temperature
Figure 25. Channel B LO to IF Leakage Over Frequency and
Temperature
Figure 26. Channel A LO to RF Leakage Over Frequency and
Temperature
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Figure 27. Channel B LO to RF Leakage Over Frequency and
Temperature
Figure 28. Channel A RF to IF Isolation Over Frequency and
Temperature
Figure 29. Channel B RF to IF Isolation Over Frequency and
Temperature
Evaluation Board Description
The SKY73089-11 Evaluation Board is used to test the
performance of the SKY73089-11 downconversion mixer. An
assembly drawing for the Evaluation Board is shown in Figure 30
and the layer detail is provided in Figure 31. A schematic diagram
of the SKY73089-11 Evaluation Board is shown in Figure 32.
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 as possible.
2. The ground pad of the SKY73089-11 has special electrical
and thermal grounding requirements. 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 wattage produced by
the circuit board.
3. Skyworks recommends including external bypass capacitors
on the VCC voltage inputs of the device.
4. Components L5, L6, L14, and L15 (see Figure 32) 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 32) set the bias current
for the IF amplifiers. Skyworks recommends that these
resistors have a tolerance of ±1% to optimize performance
consistency of the SKY73089-11. These resistors are not
required for the Evaluation Board to operate as specified in
Tables 3 and 4.
Package Dimensions
The PCB layout footprint for the SKY73089-11 is provided in
Figure 33. Figure 34 shows the package dimensions for the
36-pin MCM and Figure 35 provides the tape and reel
dimensions.
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DATA SHEET • SKY73089-11 DOWNCONVERSION MIXER
Package and Handling Information
additional information, refer to the Skyworks Application Note,
PCB Design & SMT Assembly/Rework Guidelines for MCM-L
Packages, document number 101752.
Since the device package is sensitive to moisture absorption, it is
baked and vacuum packed before shipping. Instructions on the
shipping container label regarding exposure to moisture after the
container seal is broken must be followed. Otherwise, problems
related to moisture absorption may occur when the part is
subjected to high temperature during solder assembly.
Care must be taken when attaching this product, whether it is
done manually or in a production solder reflow environment.
Production quantities of this product are shipped in a standard
tape and reel format.
THE SKY73089-11 is rated to Moisture Sensitivity Level 3 (MSL3)
at 260 °C. It can be used for lead or lead-free soldering. For
J9
J5
C34
C35
L17
L16
J4
C2
L12
L13
R4
T2
C32
L1
C28
C29
C33
C38
C3
L14
L15
C27
C1
J1
R2
C22
C21
C5
J2
C17
C7
C41
J7
L5
C14
L6
L4
R6 R1
C40
C13
C12
L18
C36
J10
J8
L11
C23
C8
L3
C24
R5
C20
C4
C6
C39
C26
L2
C25
L19
T1
C11
L10
C19
R3
C37
C18
L8
C15
J3
L9
C16
J6
S905
Figure 30. SKY73089-11 Evaluation Board Assembly Diagram
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DATA SHEET • SKY73089-11 DOWNCONVERSION MIXER
Layer 1: Top -- Metal
Layer 2: Ground
Layer 3: Power Plane
Layer 4: Solid Ground Plane
S904
Figure 31. SKY73089-11 Evaluation Board Layer Detail
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DATA SHEET • SKY73089-11 DOWNCONVERSION MIXER
Figure 32. SKY73089-11 Evaluation Board Schematic
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DATA SHEET • SKY73089-11 DOWNCONVERSION MIXER
Figure 33. PCB Layout Footprint for the SKY73089-11 6 x 6 mm MCM
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DATA SHEET • SKY73089-11 DOWNCONVERSION MIXER
Figure 34. SKY73089-11 36-Pin MCM Package Dimensions
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Figure 35. SKY73089-11 Tape and Reel Dimensions
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DATA SHEET • SKY73089-11 DOWNCONVERSION MIXER
Ordering Information
Model Name
SKY73089-11 1200-1700 MHz Downconversion Mixer
Manufacturing Part Number
SKY73089-11
Evaluation Board Part Number
TW17-D880
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