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RF2484
0
RoHS Compliant & Pb-Free Product Typical Applications * Dual-Band CDMA Base Stations * TDMA/TDMA-EDGE Base Stations * GSM-EDGE/EGSM Base Stations Product Description
The RF2484 is a monolithic integrated quadrature modulator IC capable of universal direct modulation for highfrequency AM, PM, or compound carriers. This low-cost IC features excellent linearity, noise floor, and over-temperature carrier suppression performance. The device implements differential amplifiers for the modulation inputs, 90 carrier phase shift network, carrier limiting amplifiers, two matched double-balanced mixers, summing amplifier, and an output RF amplifier which will drive 50 from 800MHz to 2500MHz. It is packaged in a small industry-standard QFN 16-pin plastic package.
0.10 C B
-B-
DIRECT QUADRATURE MODULATOR
* W-CDMA Base Stations * WLAN and WLL Systems * GMSK,QPSK,DQPSK,QAM Modulation
4.00
0.10 C B
2 PLCS
3.75
2 PLCS
2.00 0.80
TYP
2 A
1.60
2 PLCS
3.75 0.75 0.50
INDEX AREA Dimensions in mm.
1.50
SQ.
4.00
0.10 C A
2 PLCS
0.45 0.28 3.20
2 PLCS
2.00
0.10 C A
2 PLCS
Shaded pin is lead 1.
12 MAX 0.05 0.00
0.10 M C A B
1.00 0.90 0.75 0.65
C
0.05
Optimum Technology Matching(R) Applied
Si BJT Si Bi-CMOS InGaP/HBT GaAs pHEMT GaAs HBT SiGe HBT GaN HEMT GaAs MESFET Si CMOS SiGe Bi-CMOS
Package Style: QFN, 16-pin, 4x4
Features * Typical Carrier Suppression>35dBc, Sideband Suppression>35dBc over temperature with highly linear operation
QREF
QSIG
IREF
GND
ISIG
* Noise Floor better than -152dBm/Hz from 800MHz to 2200MHz * Single 5V Power Supply
1 GND 2
16
15
14
13 12 GND
GND 3 LO 4 5 GND 6 VCC
-45 +45
11 GND 10 VCC 7 PD 8 RF OUT 9 GND
Ordering Information
RF2484 Direct Quadrature Modulator RF2484PCBA-410 Fully Assembled Evaluation Board
Functional Block Diagram
RF Micro Devices, Inc. 7628 Thorndike Road Greensboro, NC 27409, USA
Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com
Rev A7 061115
5-1
RF2484
Absolute Maximum Ratings Parameter
Supply Voltage Input LO and RF Levels Operating Ambient Temperature Storage Temperature
Rating
-0.5 to +7.5 +10 -40 to +85 -40 to +150
Unit
VDC dBm C C
Caution! ESD sensitive device.
RF Micro Devices believes the furnished information is correct and accurate at the time of this printing. RoHS marking based on EUDirective2002/95/EC (at time of this printing). However, RF Micro Devices reserves the right to make changes to its products without notice. RF Micro Devices does not assume responsibility for the use of the described product(s).
Parameter
LO Input
Frequency Range Power Level Input Impedance
Specification Min. Typ. Max.
800 -6 45-j95 52-j54 58-j50 63-j40 DC 4.1 30 40 250 2500 +6
Unit
Condition
T=25C, VCC =5V, VREF =4.1V; I and Q driven single-ended
MHz dBm MHz V k A
At 880MHz At 1960MHz At 2140MHz At 2400MHz
Modulation Input
Frequency Range Reference Voltage (VREF) Input Resistance Input Bias Current
RF Output (880MHz)
CDMA Output Channel Power CDMA ACPR Carrier Suppression Carrier Suppression over Temperature Sideband Suppression Sideband Suppression over Temperature Broadband Noise Floor EVM Phase Error Rho Output Impedance 50 35 50 35 -152.5 2.3 1 .9993 28-j72 -12 -72 dBm dBc dBc dBc dBc dBc dBm/Hz % RMS
LO= -5dBm at 880MHz; Single sideband testing unless otherwise noted For ACPR=-72dBc; I&Q Amplitude=1.1VPP (single-ended) Channel Power=-12dBm; see Test Setup for detailed information T=25C; POUT =-10dBm; optimized I,Q DC offsets Temperature cycled from -40C to +85C after optimization at T=25C; POUT =-10dBm T=25C; POUT =-10dBm; optimized I,Q amplitude and phase balance Temperature cycled from -40C to +85C after optimization at T=25C; POUT =-10dBm At 20MHz offset, 30kHz res BW, VCC =5V; ISIG, QSIG, IREF, and QREF tied to VREF See Test Setup for detailed information See Test Setup for detailed information See Test Setup for detailed information LO=-5dBm at 1960MHz; Single sideband testing unless otherwise noted For ACPR=-72dBc; I&Q Amplitude=1.2VPP (single-ended) Channel Power=-13dBm; see Test Setup for detailed information T=25C; POUT =-13dBm; optimized I,Q DC offsets Temperature cycled from -40C to +85C after optimization at T=25C; POUT =-13dBm T=25C; POUT =-13dBm; optimized I,Q amplitude and phase balance Temperature cycled from -40C to +85C after optimization at T=25C; POUT =-13dBm
RF Output (1960MHz)
PCS CDMA Output Power PCS CDMA ACPR Carrier Suppression Carrier Suppression over Temperature Sideband Suppression Sideband Suppression over Temperature 50 35 50 35 -13 -72 dBm dBc dBc dBc dBc dBc
5-2
Rev A7 061115
RF2484
Parameter
RF Output (1960MHz) cont'd
Broadband Noise Floor EVM Phase Error Rho Output Impedance -154.5 2.3 1 .9988 46-j22 dBm/Hz % RMS LO= -5dBm at 2140MHz; Single sideband testing unless otherwise noted For ACPR=-60dBc; I&Q Amplitude=1.4VPP (single-ended) Channel Power=-16dBm; see Test Setup for detailed information T=25C; POUT =-13dBm; optimized I,Q DC offsets Temperature cycled from -40C to +85C after optimization at T=25C; POUT =-13dBm T=25C; POUT =-13dBm; optimized I,Q amplitude and phase balance Temperature cycled from -40C to +85C after optimization at T=25C; POUT =-13dBm At 20MHz offset, 30kHz res BW, VCC =5V; ISIG, QSIG, IREF, and QREF tied to VREF See Test Setup for detailed information See Test Setup for detailed information See Test Setup for detailed information At 20MHz offset, 30kHz res BW, VCC =5V; ISIG, QSIG, IREF, and QREF tied to VREF See Test Setup for detailed information See Test Setup for detailed information See Test Setup for detailed information
Specification Min. Typ. Max.
Unit
Condition
RF Output (2140MHz)
W-CDMA Output Channel Power W-CDMA ACPR Carrier Suppression Carrier Suppression over Temperature Sideband Suppression Sideband Suppression over Temperature Broadband Noise Floor EVM Phase Error Rho Output Impedance 50 35 50 35 -152 5.9 2.4 .9961 58-j16 100 50 2.8 1.0 1.2 5.0 4.5 Current 66 6.0 70 25 -16 -60 dBm dBc dBc dBc dBc dBc dBm/Hz % RMS ns k V V V V mA A
Power Down
Turn On/Off Time PD Input Resistance Power Control "ON" Power Control "OFF"
Threshold voltage Threshold voltage Specifications Operating Limits Power Down
Power Supply
Voltage
Rev A7 061115
5-3
RF2484
Pin 1 2 3 4 5 6 7 Function GND GND GND LO GND VCC PD Description
Ground connection. This pin should be connected directly to the ground plane. Same as pin 1. Same as pin 1. The input of the phase shifting network. This pin has an internal DC blocking capacitor. This port is voltage-driven so matching at different frequencies is generally not required. Same as pin 1. Power supply. An external capacitor is needed if no other low frequency bypass capacitor is nearby. Power Down control. When this pin is "low," all circuits are shut off. A "low" is typically 1.2V or less at room temperature.When this pin is "high" (VCC), all circuits are operating normally. If PD is below VCC, output power and performance will be degraded. Operating in this region is not recommended, although it might be useful in some applications where power control is required. RF Output. This pin has an internal DC blocking capacitor. At some frequencies, external matching may be needed to optimize output power. A small amount of DC current may be present at this output. As a result, if the voltage at this pin is measured using a high impedance probe, some DC voltage may be observed at this output.
LO
Interface Schematic
VCC 200 PD
8
RF OUT
RF OUT
9 10 11 12 13
GND VCC GND GND Q SIG
Same as pin 1. Same as pin 6. Same as pin 1. Same as pin 1. Baseband input to the Q mixer. This pin is DC coupled. The input drive level determines output power and linearity performance; for better carrier suppression, sideband suppression, and dynamic range, the drive level should be as high as possible to meet the required linearity performance. The recommended DC level for this pin is 4.1V. For optimum carrier suppression, the DC voltages on I REF, Q REF, I SIG and Q SIG should be adjusted slightly to compensate for inherent undesired internal DC offsets; for optimum sideband suppression, phase and signal amplitude on IREF, Q REF, I SIG and Q SIG should be adjusted slightly to compensate for inherent undesired internal offsets. See RFMD AN0001 for more detail. Baseband input to the I mixer. This pin is DC coupled. The input drive level determines output power and linearity performance; for better carrier suppression, sideband suppression, and dynamic range, the drive level should be as high as possible to meet the required linearity performance. The recommended DC level for this pin is 4.1V; see pin 13 for more information. Reference voltage for the I mixer. This voltage should be the same as the DC voltage supplied to the I SIG pin. A voltage of 4.1V is recommended; see pin 13 for more information. The SIG and REF inputs are inputs of a differential amplifier. Therefore the REF and SIG inputs are interchangeable. If swapping the I SIG and I REF pins, the Q SIG and Q REF also need to be swapped to maintain the correct phase. It is also possible to drive the SIG and REF inputs in a differential mode. This will increase the gain.
VCC 100 1p
14
I SIG
VCC 100 1p
15
I REF
VCC 100 1p
5-4
Rev A7 061115
RF2484
Pin 16 Function Q REF Description
Reference voltage for the Q mixer. This voltage should be the same as the DC voltage supplied to the Q SIG pin. A voltage of 4.1V is recommended; see pin 13 for more information.
Interface Schematic
VCC 100 1p
Pkg Base
GND
Ground connection. The package base should be connected to the ground plane.
Rev A7 061115
5-5
RF2484
CDMA/W-CDMA Test Setup
Rohde & Schwarz AMIQ 1110.2003.02
I SIG
I REF
Q SIG
Q REF
Hewlett-Packard 8665B
LO IN
Rohde & Schwarz FSIQ 1119.6001.26
RF2484 Evaluation Board Agilent 66332A
VCC RF OUT VPD
Agilent 89441 Vector Signal Analyzer
General The above setup was used to evaluate the RF2484 under CDMA and W-CDMA modulation conditions. An AMIQ was required to provide the appropriate DC reference voltage (4.1V) for the I and Q pins. I and Q were driven single-endedly; differential drive may improve performance. A PC-controlled Rohde & Schwarz AMIQ generated the CDMA I and Q signals. In order to reduce AMIQ noise contributions to adjacent channel power, W-CDMA baseband signals were filtered using a high order low pass filter before application to the RF2484. EVM, Phase Error, and Rho To measure EVM, phase error, and Rho, signals were generated using the AMIQ and decoded with the Agilent VSA. For CDMA Cellular and PCS, I and Q input signals were generated with the Pilot Channel active, 32x oversampling and base station equifilters. For W-CDMA, the Common Pilot Channel was active with 8x oversampling and a root cosine filter. In all cases, relative signal amplitude levels were adjusted to optimize signal quality. CDMA Modulation Setup (Cellular and PCS) To measure ACPR, I and Q input signals were generated using the following settings: * Pilot Channel active * Sync Channel active * Paging Channel active * 6 Traffic Channels active * 32x Oversampling * Base Station equifilter W-CDMA Modulation Setup To measure W-CDMA ACPR, I and Q input signals were generated using the following settings in the AMIQ: * P-CPICH (Common Pilot Channel) active * P-SCH (Sync Channel) active * P-CCPCH (Primary Common Control Physical Channel) active * P-ICH (Page Indicator Channel) Active * DL-DPCCH (Dedicated Physical Control Channel) active * 6 DPCH (Dedicated Physical Channels) active * 8x Oversampling
5-6
Rev A7 061115
RF2484
Application Schematic
3 pF IREF QREF 3 pF
100 nF ISIG QSIG 100 nF 1 2
16
15
14
13 12 11
3 LO 4 5 6
-45 +45
10 7 8 9 100 nF 100 nF
VCC
3 pF VCC PD
100 nF
RF OUT
Rev A7 061115
5-7
RF2484
Evaluation Board Schematic
NOTES: 1. R1 is installed for non-independent control of I and Q reference voltages. R1a gives independent control of reference voltages. 2. Components with * following the reference designator should not be populated on the evaluation board. R1a* 0 IREF R1 0 C5 3 pF C6 100 nF J4 QSIG VREF/QREF C7 3 pF C8 100 nF U1 1 2
P1 P1-1 1 2 3 CON3 VCC GND GND P2-3 P2-1
P2 1 2 3 CON3 J3 ISIG VREF/QREF GND IREF
16
15
14
13 12 11
3 J2 LO 4 5 6
-45 +45
10 7 8 9 C3 3 pF
2484400-
VCC C4 100 nF
VCC C1 3 pF C2 100 nF
J1 RFOUT
5-8
Rev A7 061115
RF2484
Evaluation Board Layout Board Size 2.0" x 2.0"
Board Thickness 0.028", Board Material FR-4
Rev A7 061115
5-9
RF2484
-20
RF2484 Cellular CDMA Spectra at Various Output Levels (ACPR @ 885kHz, Vcc = 5.0V, Vref = 4.1V, T = 25C)
-20
RF2484 PCS CDMA Spectra at Various Output Levels (ACPR @ 885 kHz, Vcc = 5.0V, Vref = 4.1V, T = 25C)
-30
-30
-40 Note: Below ~-90dBm, test setup noise inhibits accurate ACP measurement. CP = -9.5 dBm; ACPR = -68 dBc
-40 CP = -11.1 dBm; ACPR = -71 dBc CP = -12.9 dBm; ACPR = -72 dBc -60 CP = -14.3 dBm; ACPR = -73 dBc -70
Power (dBm)
-60
CP = -12.0 dBm; ACPR = -72 dBc CP = -14.7 dBm; ACPR = -73 dBc
-70
-80
Power (dBm)
-50
CP = -10.6 dBm; ACPR = -70 dBc
-50
-80
-90
-90
-100 877.5
878
878.5
879
879.5
880
880.5
881
881.5
882
882.5
-100 1957.5 1958 1958.5 1959 1959.5 1960 1960.5 1961 1961.5 1962 1962.5
Frequency (MHz)
Frequency (MHz)
5
RF2484 Output Power versus I, Q Input Voltage Level (Vcc = 5.0V, Vref = 4.1V, T = 25C, Single Sideband)
-5
RF2484 Output Channel Power vs I, Q Input Voltage Level (Vcc = 5.0V, Vref = 4.1V, T = 25C, CDMA/W-CDMA Mod.)
0
-10
-5
Output Channel Power (dBm)
SSB Output Power (dBm)
-15
-10 880 MHz 1960 MHz -15 2140 MHz
-20
880 MHz CDMA Signal 1960 MHz CDMA Signal
-25
2140 MHz W-CDMA Signal
-20 0 200 400 600 800 1000 1200 1400 1600
-30 250 500 750 1000 1250 1500 1750 2000 2250 2500
I, Q Input Voltage Level (mVp)
I, Q Input Voltage Level (mVpp)
5-10
Rev A7 061115

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