Analog Signal Chain Guide Datasheet by Texas Instruments

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Operation of the radio circuitry in a portable device accounts for a significant amount of the total power consumption — leading to
reduced battery life and more heat. Both challenges can be addressed by using RF power management products from Texas Instruments.
Extend Battery Life, Reduce Heat
Typical System Application
RF Front End
Power Solutions
For 2G, 3G, and 4G Portable Devices
1Q 2012www.ti.com
Traditionally, the RF power amplifier (PA),
which is used to drive the antenna, is
connected directly to the battery. However,
this approach wastes a significant amount
of energy as the PA is supplied with
maximum power when often only a fraction
is required to reliably ensure wireless voice
and data connection.
TI’s broad portfolio of RF power solutions
deliver energy and heat savings that enable
higher performing RFFE systems. TI’s
switching supply for power amplifier
DC/DC converters are dynamically
adjustable power supplies for RF power
RF power solutions from TI enable
more efficient RF front end designs.
VCC
VCC
Wasted Energy/Heat
Energy/Heat Savings
Energy Waste
Energy Savings with TI
VCC
VCC
Wasted Energy/Heat
Energy/Heat Savings
Energy Waste
Energy Savings with TI
amplifiers that optimize power usage –
especially when maximum PA power is not
needed. By minimizing energy waste,
TI’s solutions extend battery life and
simplify thermal design for devices such
as smartphones, tablets, and machine-to-
machine terminals.
The RF DC/DC converters have been
qualified, designed in, and software
supported by multiple Tier 1 RFIC reference
design/platform suppliers and PA partners.
Product compatibility and performance is
proven and trusted. TI has an extensive
RF DC/DC portfolio that supports 2G/3G/4G
air standards.
Traditional Approach: Fixed Battery Supply for RF PA
TI Solution: Adaptive Supply for RF PA
RF Power
Detector
Adaptive
Supply for PA
Applications
Processor
Baseband
Processor
Transceiver Power
Amplifier
Tx/Rx
Switch
Battery
RF DC/DC Switching Converters for RF Power Amplifiers
TI’s Supply for Power Amplifier products are DC/DC converters with dynamically adjustable power outputs. Buck and Buck-Boost solutions
are designed especially for supplying RF power amplifiers – including in new LTE and lower voltage battery applications, by extending
battery life for more talk and data usage time and reducing heat dissipation by up to 30ºC for a more reliable, easier-to-design system.
Typical Application Circuit
LM3242 – 6 MHz, 750 mA Miniature, Adjustable, Step-Down Converter
Automatically operates in one of five modes (PWM, ECO, Bypass,
Standby, Shutdown) for optimal performance during all load
requirements and battery conditions
6 MHz PWM switching frequency and tiny chip-scale package
enable small solution size
Buck/Step-Down Solutions
RF Front End Power Solutions Texas Instruments 1Q 2012
0.5 µH
VOUT = 2.5 x VCON
0.4V to 3.6V
VIN
2.7V to 5.5V
4.7 µF
10 µF
GPO1
DAC
VIN
LM3242
BPEN
EN
SW
FB
VCON
SGND PGND
0
50
100
150
200
250
300
350
400
450
500
0 5 10 15 20 25 30
Battery Current (mA)
RFOUT (dBm)
With LM3242 Without LM3242
Save100 mA
at 25 dBm
Save150 mA
at 20 dBm
LM3243 – 2.7 MHz, High-Current, Step-Down Converter with
Active Current Assist and Analog Bypass (ACB)
• Automatically operates in one of five modes (PWM, PFM, ACB,
Bypass, Shutdown) for optimal performance during all load
requirements and battery condition
LM3242 Reduces PA Heat by 30° at max RF power (28 dBM) Battery Current vs RFOUT with and without LM3242
Unique Active Current Assist and Analog Bypass (ACB) mode
minimizes inductor sizing while enabling high current and very
low-dropout voltage support
u Supports 2G, 3G and 4G/LTE applications
u Supports 3G and 4G/LTE applications
Typical Application Circuit
LM3243
PVIN
VDD
FB
VCON
PGND
SGND
EN
MODE
VBATT
VOUT
ACB
BP
VCC_PA_2G
BB or
RFIC
DAC
GPO2
GPO1
BGND
1.5
µ
H
10
µ
F
1.0
µ
F
PA
4.7
µ
F
PA(s)
VCC_PA_3G
10
µ
F
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RF DC/DC Switching Converters for RF Power Amplifiers
RF Front End Power Solutions Texas Instruments 1Q 2012
LM3209-G3 and LM3269 – Seamless Buck-Boost
DC/DC Converters
The LM3209-G3/69 buck-boost DC/DC converters are designed to
generate output voltages above or below a given input voltage
and are particularly suited for single cell Li-ion batteries for
portable applications.
Both LM3209-G3 and LM3269 operate at a 2.4 MHz typical
switching frequency in full synchronous operation providing
seamless transitions between buck and boost operating
regimes. The LM3269 operates in energy-saving PFM mode
for increased efficiencies and current savings during low-power
RF transmission modes.
Features
Up to 4.2V adjustable output voltage
° LM3269 up to 3.8V VOUT
1A maximum load capability for VIN ≥3.2V, VOUT = 3.6V
Fast output voltage transition 0.8 to 4.0V in <20 μs
High-efficiency, 95% typ at 3.7 VIN, 3.5 VOUT, at 300 mA
Only one external inductor and two external caps
Benefits
Reduces battery current draw
Allows higher PA output power across battery voltage range with
boost capability
Enables higher data rate uplink
Extends battery operation range
Maximizes LTE usage
Maximum power transmission possible with VBAT low at
3V and also 2.7V
Eliminates minimum cut-off constraint for RFOUT max power
Meets stringent LTE specifications (ACLR and slot timing)
Device Topology VOUT (V) VIN (V) IOUT (mA) Efficiency (typ.) 3.6VIN / 3.4VOUT* Air Standards micro SMD Package
LM3241 Buck with ECO/PWM 0.6 to 3.6 2.7 to 5.5 750 Up to 95% 3G/4G 6-bump
LM3242 Buck with Bypass/ECO/PWM 0.4 to 3.6 2.7 to 5.5 750/1000 Up to 95% 3G/4G 9-bump
LM3212 Buck with ACB 0.5 to 3.6 2.7 to 5.5 2500 Up to 95% 2G/3G/4G 16-bump
LM3243 Buck with ACB 0.4 to 3.6 2.7 to 5.5 750 Up to 95% 2G/3G/4G 16-bump
LM3253 Buck with ACB 0.4 to 3.6 2.7 to 5.5 750 Up to 95% 2G/3G/4G 16-bump
LM3209-G3 Buck-Boost 0.6 to 4.2 2.7 to 5.5 1000 Up to 95% 3G/4G 12-bump
LM3269 Buck-Boost with PFM/PWM 0.6 to 3.8 2.7 to 5.5 1000 Up to 95% 3G/4G 12-bump
Typical Application Circuit
Buck-Boost Solutions
RF DC/DC Switching Converters
Seamless Buck – Boost Mode Transition
Noise Measurement – Buck Mode
* Refer to datasheet for more efficiency conditions New products are listed in bold red. Preview devices are listed in bold blue.
2.2 µH
PVIN
EN
SGND
PGND
SW1
SW2
LM3209-G3
VOUT
FB
VCON
RF PA
V
OUT
:
0.
6
V
to
4.2V
4.7 µF
10 µF
V
IN
:
2.7V
to
5.5V
DAC
+
PVIN
u Supports 3G and 4G/LTE applications SW2
SW1
VOUT
Ripple
VCON
INSTRUMENTS nr Inpln Pmr (aaml EnIMdB}
© 2012 Texas Instruments Incorporated
Printed in U.S.A. by Almaden Press, San Jose, CA
The platform bar is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
SLYB192
RF Power Detectors
PA
Antenna
RFIN
OUT
LMV221
RF
VDD
GND
50
EN
REF
ADC
2
CS
R
S
1
6
3
4
5
+
Coupler
RF Power Detectors
Device Application Channels
Supply
Voltage Range (V)
Dynamic
Range (dB)
Frequency
Range (MHz) Type Package(s)
LMV221 CDMA, WCDMA, GSM, GPRS 1 2.7 to 3.3 40 50 to 3500 LOG Amp LLP-6
LMV225 CDMA, WCDMA, GSM, EDGE, GPRS, TDMA 1 2.7 to 5.5 >30 450 to 2000 LOG Amp micro SMD-4, LLP-6
LMV226 CDMA, WCDMA, GSM, EDGE, GPRS, TDMA 1 2.7 to 5.5 >30 450 to 2000 LOG Amp micro SMD-4
LMV228 CDMA, WCDMA, GSM, EDGE, GPRS, TDMA 1 2.7 to 5.5 >30 450 to 2000 LOG Amp micro SMD-4
LMV232 3G, UMTS, WCDMA, CDMA2000, LAN, GPS 2 2.5 to 3.3 20 50 to 2000 LIN MS Amp micro SMD-8
LMH2100 CDMA, WCDMA, GSM, GPRS 1 2.7 to 3.3 40 50 to 4000 LOG Amp micro SMD-6
LMH2110 LTE, UMTS, WCDMA, CDMA2000, GSM/EDGE 1 2.7 to 5 45 50 to 8000 LOG RMS micro SMD-6
LMH2120 LTE, UMTS, WCDMA, CDMA2000, GSM/EDGE 1 2.7 to 5 40 50 to 6000 LIN RMS micro SMD-6
LMV242 GSM, GPRS, TDMA, LAN 2 2.6 to 5.5 50 450 to 2000 LOG Amp LLP-10
2.4
2
.0
1
.6
1
.2
0
.8
0
.4
0
.0
–40
–30 –20 –10
0
10
85°C
–40°C
25°C
Error (dB)
RF Input Power (dBm)
V
OUT
(V)
3
2
1
0
–1
–2
–3
LMH2110, LMH2120 – 8 GHz LOG/LIN RMS
RF Power Detectors
LMH2110: 40-dB linear-in-dB power detection range
LMH2120: 40-dB linear-in-V power detection range
> 30-dB dynamic range, 1900 MHz, n = 50
Shutdown pin
Multi-band operation from 50 MHz up to 8 GHz
LMV221, LMH2100 – 50 MHz to 4 GHz 40 dB
Logarithmic Power Detectors
40-dB linear-in-dB power detection range
0.3-V to 2-V output voltage range
Shutdown pin
Multi-band operation from 50 MHz to 3.5 GHz
0.5-dB accurate temperature compensation
External configurable output filter bandwidth
Typical Application Circuit
TI’s family of RF detectors provides transmit power control so that
only the necessary amount of power is used, saving energy and
increasing transmission range. These RF detectors feature high
linearity and accuracy over temperature to reduce PA power guard-
band requirements for greater coverage range, battery power
savings, and increased channel quality.
VOUT and Log Conformance Error vs. RF Input Power
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