SKY73013-306 - Skyworks Solutions, Inc.

PRELIMINARY DATA SHEET
SKY73013-306: Direct Quadrature Demodulator
4.9–5.925 GHz Featuring “No-Pull” LO Architecture
Functional Block Diagram
Applications
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WiMAX, WLAN receivers
UNII Band OFDM receivers
RFID, DSRC applications
Proprietary radio links
Features
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RF is non-integer multiple of LO frequency
Broadband RF: 4.9–5.925 GHz, LO: 3.268–3.952 GHz,
IF: DC–100 MHz
Single 3.3 V supply
Very low LO drive level (-15 dBm)
High dynamic range, low noise figure
Excellent linearity and quadrature accuracy—suitable for
64-QAM OFDM
Low current consumption
Small 4 x 4 mm 16-lead QFN package
Available lead (Pb)-free and RoHS-compliant
Baseband Output
I+
I-
RF
Input
LNA
x 3/2
Frequency
Multiplier
2/3 FRF
Local
Oscillator
Gain Control
(on/off)
Q+
Q-
Baseband Output
Description
The Skyworks SKY73013-306 is an integrated receiver downconverter subsystem for the 4.9–5.925 GHz band. Its exceptional
dynamic range and quadrature accuracy make this device an
ideal solution for direct conversion and low-IF OFDM and singlecarrier communications systems (including 64-QAM WiMax
and WLAN).
The SKY73013-306 employs an innovative “no-pull” local
oscillator (LO) architecture which offsets the required synthesizer
frequency from that of the receiver center frequency by the
non-integer factor of 3/2. This greatly improves the performance
of direct conversion receiver architecture by eliminating dynamic
DC offsets (caused by LO-RF leakage) and VCO pulling. This
receiver frequency plan is compatible with the 3/2 “no-pull”
modulator frequency plan.
The SKY73013-306 contains a low noise amplifier at the RF
input, the gain of which can be set to a high or low value via the
gain control input. This LNA drives a highly linear quadrature
mixer pair. The quadrature local oscillator signals to these mixer
stages are provided by the 3/2 frequency conversion stage.
The nominal supply voltage for SKY73013-306 is 3.3 V. This part
can operate over the temperature range of -40 °C to 85 °C.
An evaluation board is available upon request.
NEW
Skyworks offers lead (Pb)-free, RoHS (Restriction of
Hazardous Substances)-compliant packaging.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200508 Rev. C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 1, 2008
1
PRELIMINARY DATA SHEET • SKY73013-306
Electrical Specifications
VCC = 3.3 V, T = 25 °C, LO Input Power = -15 dBm, ZOUT = 1000 Ω Differential unless otherwise noted
Parameter
Condition
Min.
Typ.
Max.
3
3.3
3.6
Unit
DC Operating Conditions
Supply voltage
DC current
33
V
mA
RF Performance
RF input frequency
4.9
5.925
GHz
LO input frequency
3.268
3.952
GHz
-10
dBm
LO drive level
-20
RF input impedance
Differential
LO input impedance
Differential
100
100
IQ amplitude imbalance
IQ phase error
Noise figure
-15
Direct conversion measurement (no image),
LNA Gain control voltage = VCC
Direct conversion measurement (no image),
LNA Gain control voltage = 0 V
0.15
0.25
dB
2
3
Deg
6.0
8.5
dB
26
27
dB
26
4
dB
dB
Voltage conversion gain(1)
LNA gain control voltage = VCC
LNA gain control voltage = 0 V
22.5
0
24.5
2
Input 1 dB compression point
LNA gain control voltage = VCC
LNA gain control voltage = 0 V
-17
-16
-15
-14
dBm
dBm
Input IP2
LNA gain control voltage = VCC
LNA gain control voltage = 0 V
28
32
dBm
dBm
Input IP3
LNA gain control voltage = VCC
LNA gain control voltage = 0 V
0
3
dBm
dBm
BB load impedance
Differential
IF output common mode voltage
500 || 15
1.55
IF DC offset
IF output linear signal swing
Ω || pF
1.65
1.75
V
10
20
mV
Differential
IF frequency range
DC
LO-to-RF isolation
2
Vpp
100
MHz
61
1. Voltage conversion gain = 20 log10 (VOUTrms/VINrms), independent of impedance.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
2
February 1, 2008 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200508 Rev. C
dB
PRELIMINARY DATA SHEET • SKY73013-306
Typical Performance Data
VCC = 3.3 V, T = 25 °C, LO Input Power = -15 dBm, ZOUT = 1000 Ω Differential unless otherwise noted
30
30
25
20
Noise Figure (dB)
Voltage Gain (dB)
25
LNA Gain Control = VCC
15
10
LNA Gain Control = 0 V
5
LNA Gain Control = 0 V
20
15
10
LNA Gain Control = VCC
0
5
-5
4600
4800
5000
5200
5400
5600
5800
4600
6000
5000
5200
5400
5600
5800
Frequency (MHz)
Frequency (MHz)
Voltage Conversion Gain vs. Frequency
Noise Figure vs. Frequency
0.25
6000
3.0
LNA Gain Control = VCC
Phase Error (Degrees)
0.20
I/Q Imbalance (dB)
4800
0.15
0.10
LNA Gain Control = 0 V
0.05
2.5
2.0
1.5
1.0
0.5
0
0
4600
4800
5000
5200
5400
5600
5800
6000
4600
4800
5000
5200
5400
5600
5800
Frequency (MHz)
Frequency (MHz)
I/Q Imbalance vs. Frequency
Phase Error vs. Frequency
6000
-10
-11
IP1 dB (dBm)
-12
LNA Gain Control = 0 V
-13
-14
-15
-16
-17
LNA Gain Control = VCC
-18
-19
-20
4600
4800
5000
5200
5400
5600
5800
6000
Frequency (MHz)
Input 1 dB Compression Point vs. Frequency
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200508 Rev. C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 1, 2008
3
PRELIMINARY DATA SHEET • SKY73013-306
Pin Out
Pin Descriptions
RBIAS
LNA+
LNAGND
EN
Gain
C
I-
I+
16
15
14
13
Pin #
12 N/C
1
11 LO-
2
10 LO+
3
9 CTR2
4
5
6
7
8
VCC
Q+
Q-
CTR
Evaluation Board
Name
Description
1
RBIAS
Bias resistor. Nominal value = 1.2 k, 1%
2
LNA+
RF input +
3
LNA1
RF input -
4
GND
Ground
5
VCC
Supply voltage
6
Q+
BB/IF Q+ output
7
Q-
BB/IF Q- output
8
CTR1
9
CTR2
Debug pin; connect to ground
10
LO+
Local oscillator input +
Debug pin; connect to ground
11
LO-
Local oscillator input -
The SKY73013 Evaluation Board is used to test the performance
of the SKY73013 Direct Quadrature Demodulator. The evaluation
board BOM is as shown in the table below.
12
N/C
No connection
13
I+
BB/IF I+ output
14
I-
BB/IF I- output
The evaluation board for SKY73013 allows the part to be fully
exercised. The board is populated with several components
which are not required for normal operation but facilitate special
testing of the SKY73013, such as two high gain, differential
baseband amplifiers which are well-suited for differential-tosingle-ended conversion, and are included for noise figure
measurements.
15
GainC
16
EN
Paddle
Gain control; LNA is ON with VCC applied to
this pin, off when grounded
Chip enable; chip is enabled with VCC applied
to this pin and disabled when this pin is
grounded
Must be connected via lowest possible
impedance to ground for proper electrical
and thermal performance
The evaluation board requires a power supply voltage of 3.3 V
nominal, that is capable of sourcing 50 mA.
Absolute Maximum Ratings
Characteristic
Evaluation Circuit PCB
RF Input Power
VCC
VGC (LNA On/Off)
IF Outputs:
[I-, I+, Q+, Q-]
Supply voltage
4.5 V
Supply current
60 mA
LO input power
LO+
RF+
Value
0 dBm
0 dBm
Operating temperature
-40 °C to +85 °C
Storage temperature
-65 °C to +85 °C
Performance is guaranteed only under the conditions listed in the specifications table and is
not guaranteed under the full range(s) described by the Absolute Maximum specifications.
Exceeding any of the absolute maximum/minimum specifications may result in permanent
damage to the device and will void the warranty.
LO-
RF-
Op-Amp
IF Outputs:
[I-, I+, Q+, Q-]
Op-Amp Power Header
[+5 V, +1.5 V, GND, -5 V]
High Gain Op-Amps to
Observe very Small
Signals on an Oscilloscope
CAUTION: Although this device is designed to be as robust as
possible, ESD (Electrostatic Discharge) 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 must be employed
at all times.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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February 1, 2008 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200508 Rev. C
PRELIMINARY DATA SHEET • SKY73013-306
Evaluation Circuit Schematic
VGAIN CONTROL
VCC
VCC
C25
Ground
R5
C26
U2
AD8138ARM
Ground
H2
VP
R7
Enable
VOCM
C23
C22
H1
} “I”
R8
BB Out
U1
R1
16
15
14
13
EN
GainC
I-
I+
1 R BIAS
C1
VN
} “Q”
R9
N/C 12
C10
C2
RF Input +
2 LNA+
SKY73013
3 LNAC3
L8
LO
Input +
L6
LO
Input -
LO- 11
C4
RF Input -
LO+ 10
4 GND
VCC
5
Q+
6
Q7
CTR2
CTR1
8
BB Out
C8
9
C19
R3
L5
C27
H3
VCC
C7
C6
VP
C20
} “I”
R2
BB Out
VP
VOCM
VP
VOCM
VOCM
R4
U3
AD8138ARM
Ground
VN
VN
H4
C30
} “Q”
BB Out
VN
R6
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 noise 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 VCC and either 3.3 V or 0 V
to VGAIN 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 • [email protected] • www.skyworksinc.com
200508 Rev. C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 1, 2008
5
PRELIMINARY DATA SHEET • SKY73013-306
Evaluation Board Test Procedure for Evaluating
Noise Floor
Evaluation Board Components
Component
Description
C1, C3, C8, C10, C12, C17
Do not place
C2, C4
0.5 pF
1. Reduce the input RF level to -60 dBm
C6
10 pF
0805
2. Connect 5 V to the 5 V pin on header 4 to power the
differential amplifiers U2 and U3.
C7
100 pF
0603
0402
This is procedure assumes that circuit is set up according to the
procedure described above.
3. Move the Oscilloscope probes to the I+, I-, Q+ and Q- pins of
header 3. The differential amplifiers are included in the signal
path because the IF output signals directly from the I and Q
baseband outputs of the SKY73013 are smaller than the
minimum required by most oscilloscopes to make a reasonable
measurement, although these signal levels are well within the
dynamic range of almost any op amp or variable gain amplifier.
4. Adjust RF signal generator level until demodulated noise is
approximately equal to that of the downconverted sinusoid
output level. This input signal level corresponds to the inputreferred noise floor, the input level at which the output SNR
is 0 dB.
Circuit Design Considerations
The following design considerations are general in nature and
must be followed regardless of final use or configuration.
Default
0201
C13, C14
2.7 pF
C15, C18, C22, C24
1000 pF
0402
C19
5.1 pF
0402
C20
1 pF
0402
C21
0Ω
0402
C23
100 pF
0402
C25, C26, C27
5.1 pF
0201
C28, C29, C30
0.1 µF
0402
H1, H3
8-pin SMT header
H2, H4
4-pin header
L5, L6, L8
0Ω
0402
R1
1.2 k Ω 1%
0402
0402
R2
510 Ω
R3, R5, R6, R9
39k Ω
0402
R4, R7, R8
510 Ω
0402
RFC1, RFC2, RFC3, RFC4
SMA connector
U1
SKY73013
U2, U3
AD83138ARM
1. Paths to ground should be made as short as possible, with
lowest possible impedance.
2. The ground pad of the SKY73013 direct quadrature
demodulator has special electrical and thermal grounding
requirements. This pad is the main thermal conduit for heat
flow from the die to the circuit board. As such, design the
printed circuit board ground pad to dissipate the maximum
heat produced by the SKY73013 and ensure that the method
used to electrically and mechanically connect the SKY73010
package to this ground pad is adequate to allow for this
heat flow.
3. Two external bypass capacitors on the Vcc pin are recommended. One larger-value capacitor should be used for low
frequency bypassing and the other, smaller value capacitor
for high frequency bypassing. The smaller capacitor should
be physically located as near as possible to the SKY73013
VCC pin. Special attention should be given to ensure that the
selected smaller capacitor does not go into parallel self
resonance at the RF frequency.
QFN-16 (4 X 4mm)
0.157
(4.00 mm)
0.008 (0.20 mm)
Seating Plane
Pin 1
Indicator
0.157
(4.00 mm)
0.085 (2.15 mm)
+ 0.004 (0.10 mm)
- 0.006 (0.15 mm)
Exposed Pad
0.042
(1.075 mm)
0.0008
(0.02 mm)
+0.001
(0.03 mm)
-0.0008
(0.02 mm)
0.035 (0.90 mm)
± 0.004 (0.10 mm)
0.085 (2.15 mm)
+ 0.004 (0.10 mm)
- 0.006 (0.15 mm)
0.077
(1.950 mm)
0.077 (1.950 mm)
4. The RF and LO inputs must be driven differentially for optimal
performance. A 1:1 impedance balun is recommended for each
with a center tap on the secondary side that is DC grounded.
Special attention should be paid to ensure that the center tap
has access to as “clean” a ground as possible.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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February 1, 2008 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200508 Rev. C
PRELIMINARY DATA SHEET • SKY73013-306
Copyright © 2002, 2003, 2004, 2005, 2006, 2007, 2008, Skyworks Solutions, Inc. All Rights Reserved.
Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided
by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the
information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to
update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes.
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information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and
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SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION,
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Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury,
death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any
damages resulting from such improper use or sale.
Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of
products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for
applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters.
Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and
names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are
incorporated by reference.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200508 Rev. C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 1, 2008
7