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19-1894; Rev 0; 1/01
L MANUA ION KIT ALUAT DATA SHEET EV WS FOLLO
5GHz to 6GHz Low-Noise Amplifier in 6-Pin UCSP
Features
o 5GHz to 6GHz Wideband Operation o Low Noise Figure: 1.8dB at 5.25GHz o High Gain: 17dB o High IIP3: 0dBm o +2.7V to +3.6V Single-Supply Operation o Chip-Scale Package (UCSP) Measuring 1.0mm 1.5mm
General Description
The MAX2648 high-linearity, silicon-germanium (SiGe) low-noise amplifier (LNA) is designed for 5GHz wireless LAN systems based on IEEE 802.11a and HiperLAN2 standards. The LNA provides high gain, low noise, and high linearity performance, allowing it to be used as a first-stage LNA, an LO buffer, or a transmitter driver amplifier. This highly versatile amplifier provides 17dB gain, 1.8dB noise figure, and 0dBm input third-order intercept point (IIP3) while consuming only 12mA. The MAX2648 is designed on a low-noise, advanced SiGe process optimized for high-frequency applications. It operates over a +2.7V to +3.6V supply range. The device is packaged in a tiny 23 chipscale package (UCSPTM) with six solder bumps, measuring 1.0mm 1.5mm.
MAX2648
Ordering Information
PART MAX2648EBT TEMP. RANGE -40C to +85C PIN-PACKAGE 23 UCSP
Pin Configuration Applications
IEEE 802.11a Wireless LAN ETSI HiperLAN/2 5GHz ISM Microwave Radios
RFOUT B3 GND B2 A2 GND VCC B1 BIAS A1 RFIN
MAX2648
A3
GND
2x3 UCSP
TOP VIEW (BUMPS ON BOTTOM OF DIE)
UCSP is a trademark of Maxim Integrated Products, Inc.
Typical Application Circuit
RF INPUT C1 100pF WIDTH = 21 mils LENGTH = 300 mils** OPERATING BAND 5150MHz TO 5350MHz C8* A1 RFIN A2 GND A3 GND 5725MHz TO 5825MHz C7* 1.0pF 0.7pF C8* 0.9pF 0.8pF
*THESE ARE ATC 500-SERIES, LOW-LOSS PORCELAIN 0603 CAPACITORS. **REFER TO MAX2648 EV KIT DATA SHEET FOR MORE LAYOUT INFORMATION.
MAX2648
C2 100pF VCC B1 GND B2 RFOUT
B3 WIDTH = 21 mils LENGTH = 300 mils** C7* L1 22nH
C6 100pF
RF OUTPUT
C3 1000pF
VCC
R2 8.2
C4 0.01F
________________________________________________________________ Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
5GHz to 6GHz Low-Noise Amplifier in 6-Pin UCSP MAX2648
ABSOLUTE MAXIMUM RATINGS
VCC to GND ...........................................................-0.3V to +6.0V RFOUT to GND......................................................-0.3V to +6.0V RFIN.......................................................................-0.3V to +0.8V RFIN Power (50 source) ..............................................+15dBm Continuous Power Dissipation 23-Bump UCSP (derate 24mW/C above +70C) ......500mW Operating Temperature .......................................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature.........................................-55C to +150C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +3.6V, no RF signals applied, RFIN and RFOUT terminated in 50 through a DC-blocking capacitor, RFOUT connected to VCC. Typical values for VCC = +3.0V, TA = +25C, unless otherwise noted.)
PARAMETER Supply Voltage Range Supply Current SYMBOL VCC ICC TA = +25C TA = -40C to +85C (Note 1) CONDITIONS MIN 2.7 12.3 TYP MAX 3.6 15 18 UNITS V mA
Note 1: Limits are guaranteed by design and characterization, and are not production tested.
AC ELECTRICAL CHARACTERISTICS
(MAX2648 evaluation kit, VCC = +3.0V, fIN = 5250MHz, PIN = -30dBm, 50 system, TA = +25C. Typical values for VCC = +3.0V, TA = +25C, unless otherwise noted. All limits are guaranteed by design and characterization and are not production tested.)
PARAMETER Frequency Range Power Gain Maximum Gain Variation over Temperature Input Third Order Intercept Noise Figure Input Return Loss Output Return Loss Reverse Isolation IIP3 NF |S11| |S22| |S12| SYMBOL fIN |S21| (Note 2) (Note 3) TA = -40C to +85C Two tones at 5250MHz and 5251MHz, -30dBm per tone (Note 4) (Note 4) -4.0 16 CONDITIONS MIN TYP 5250 17.4 0.2 0 1.8 -14 -14 -31 2.3 1.0 MAX UNITS MHz dB dB dBm dB dB dB dB
Note 2: The recommended operating range is 5100MHz to 5850MHz. Operation outside this frequency range is possible but has not been characterized. The device is matched, characterized, and tested at 5250MHz. For optimum performance at a given frequency, the input and output ports must be properly matched. See Applications Information section for more information on matching. Note 3: Specifications are corrected for board losses (0.4dB at input, 0.4dB at output) Note 4: Specification is corrected for board losses (0.4dB at input)
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5GHz to 6GHz Low-Noise Amplifier in 6-Pin UCSP
Typical Operating Characteristics
(MAX2648 evaluation kit tuned for 5150MHz to 5350MHz, VCC = +3.0V, fIN = 5250MHz, PIN = -30dBm, 50 system, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2648 toc01
MAX2648
GAIN vs. TEMPERATURE
MAX2648 toc02
GAIN vs. SUPPLY VOLTAGE
18.0 17.8 17.6 GAIN (dB) 17.4 17.2 17.0 16.8 16.6 16.4 16.2
MAX2648 toc03
20 18 16 SUPPLY CURRENT (mA) 14 TA = +85C
18.4 18.2 18.0 17.8 GAIN (dB) 17.6 17.4 17.2 17.0
18.2
12 10 8 6 4 2 0 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 SUPPLY VOLTAGE (V) TA = -40C TA = +25C
16.8 16.6 16.4 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 TEMPERATURE (C)
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 SUPPLY VOLTAGE (V)
P(1dB) vs. SUPPLY VOLTAGE
MAX2648 toc04
IIP3 vs. SUPPLY VOLTAGE
INPUT 3rd-ORDER INTERCEPT (dBm) 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0
MAX2648 toc05
IIP3 vs. TEMPERATURE
1.5 1.0 0.5 0 -0.5 -1.0 -1.5
MAX2648 toc06
7.0 OUTPUT 1dB DOWN POINT (dBm) 6.8 6.6 6.4 6.2 6.0 5.8 5.6 5.4
1.0 INPUT 3rd-ORDER INTERCEPT (dBm)
2.0
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 SUPPLY VOLTAGE (V)
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 SUPPLY VOLTAGE (V)
-2.0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 TEMPERATURE (C)
|S11|, |S12|, AND |S22| vs. FREQUENCY (5250MHz APPLICATION CIRCUIT)
MAX2648 toc07
|S21| vs. FREQUENCY (5250MHz APPLICATION CIRCUIT)
MAX2648 toc08
NOISE FIGURE vs. FREQUENCY (5250MHz APPLICATION CIRCUIT)
MAX2648 toc09
0 -5 -10 MAGNITUDE (dB)
|S22|
19 18 17
3.0 2.5 NOISE FIGURE (dB) 2.0 1.5 1.0 0.5 0
-20 -25 -30 -35 -40 5000 5200 5400 5600 5800 6000 OPERATING FREQUENCY (MHz) |S11| |S12|
|S21| (dB)
-15
16 15 14 13 12 11 5000 5200 5400 5600 5800 6000 OPERATING FREQUENCY (MHz)
5150 5175 5200 5225 5250 5275 5300 5325 5350 OPERATING FREQUENCY (MHz)
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5GHz to 6GHz Low-Noise Amplifier in 6-Pin UCSP MAX2648
Typical Operating Characteristics (continued)
(MAX2648 evaluation kit tuned for 5150MHz to 5350MHz, VCC = +3.0V, fIN = 5250MHz, PIN = -30dBm, 50 system, TA = +25C, unless otherwise noted.)
NOISE FIGURE vs. TEMPERATURE (5250MHz APPLICATION CIRCUIT)
MAX2648 toc10
|S11|, |S12|, AND |S22| vs. FREQUENCY (5800MHz APPLICATION CIRCUIT)
-5 -10
MAX2648 toc11
3.0 2.5 NOISE FIGURE (dB) 2.0 1.5 1.0 0.5 0
0 |S11|
MAGNITUDE (dB)
-15 -20 -25 -30 -35 -40 5000 5200 5400 5600 5800 6000 |S22| |S12|
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 OPERATING FREQUENCY (MHz)
OPERATING FREQUENCY (MHz)
|S21| vs. FREQUENCY (5800MHz APPLICATION CIRCUIT)
MAX2648 toc12
NOISE FIGURE vs. FREQUENCY (5800MHz APPLICATION CIRCUIT)
MAX2648 toc13
18 17 16 |S21| (dB) 15 14 13 12 11 10 5000 5200 5400 5600 5800
3.0 2.5 NOISE FIGURE (dB) 2.0 1.5 1.0 0.5 0 5725 5750 5775 5800
6000
5825
OPERATING FREQUENCY (MHz)
OPERATING FREQUENCY (MHz)
Pin Description
PIN A1 A2, A3, B2 B3 B1 NAME RFIN GND RFOUT VCC FUNCTION Amplifier Input. AC-couple to this pin with a DC-blocking capacitor. External matching network is required for optimum performance. Ground. Provide a low-inductance connection to the ground plane. Amplifier Output. Provide DC bias to VCC through an RF choke or a quarter-wave transmission line (see evaluation kit layout). External matching network is required for optimum performance. Power-Supply Input. Bypass directly to ground plane at this bump. Additional bypassing may be necessary for long VCC lines.
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5GHz to 6GHz Low-Noise Amplifier in 6-Pin UCSP
Detailed Description
The MAX2648 low-noise amplifier offers high gain, high linearity, and low-noise performance from 5GHz to 6GHz. This LNA also functions as a PA predriver or an LO buffer. The device has been fully characterized and tested in the 5.2GHz and 5.8GHz bands. If area allows, a better way to supply a bias for narrowband operation is to design in a quarter-wave transmission line. The far side of this high-Z0 transmission line is AC-shorted to ground with a radial stub; low-frequency decoupling is handled by a 1000pF shunt capacitor to ground nearby. Bias this point through an RF choke, and decouple the supply with a few F at the VCC connection.
MAX2648
Applications Information
Optimal gain and noise figure performance requires input and output matching circuits tuned for the band of interest. All electrical specifications and typical operating characteristics are measured on the MAX2648 evaluation kit (EV kit), which is tuned for operation in the 5.2GHz band. Referencing the application circuit, PC board layout, and components specified in the MAX2648 EV kit data sheet will reduce evaluation and design time for 5.2GHz ISM-band system designs. For applications in other bands, refer to the MAX2648 [S]parameters (Table 1), noise parameters (Table 2), and comments below to aid design.
Power-Supply Bypassing
Proper power-supply bypassing is essential for highfrequency circuit stability. Place a small value capacitor as close to the IC as possible to decouple high-frequency noise. Place a larger value capacitor near the supply to decouple low-frequency noise. Whenever possible, place the ground-connected side of bypass capacitors within a few millimeters of the IC's ground connections.
Layout Considerations
A properly designed PC board is an essential part of any RF/microwave circuit. Keep RF signal lines as short as possible to reduce losses, EMI, and stray inductance. Use multiple separate low-inductance-plated vias to the ground plane for each ground bump. The chip-scale package (UCSP) has a bump pitch of 0.5mm (19.7mil) and a bump diameter of 0.3mm (12mil). Therefore, lay out the solder pad spacing on 0.5mm (19.7mil) centers, and use a pad size of 0.25mm (10mil) and a solder mask opening of 0.33mm (13mil). Round or square pads are permissible. Refer to the Maxim application note, Wafer Level Ultra-ChipScale Packaging, for additional detailed information on UCSP layout and handling.
Input Matching
The input stage is internally biased, so no external bias circuitry is required at RFIN. Be sure to AC-couple to the input. Since the noise figure of the LNA design is severely degraded by low-Q matching components, always design with high-Q wire-wound inductors and low-loss capacitors. Remember that package parasitics must be taken into consideration; always use components with self-resonant frequencies higher than the intended frequency of operation.
Output Matching
The output of the MAX2648 is an open-collector transistor; the DC bias and RF matching network are off-chip as illustrated in the Typical Application Circuit. Bias the output stage with VCC through an RF choke, leaving as little pad exposed as possible--any exposed pad here will act like a small tuning stub and contribute a small, low-Q, shunt capacitor to the matching network.
Chip Information
TRANSISTOR COUNT: 85
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5GHz to 6GHz Low-Noise Amplifier in 6-Pin UCSP MAX2648
Table 1. MAX2648 Typical Device [S] Parameters
(TA = +25C, VCC = +3.0V, ZS = ZL = 50, input and output matching network not included).
FREQUENCY (MHZ) 100 500 1000 1500 2000 2500 3000 3500 4000 4500 4600 4700 4800 4900 5000 5100 5200 5300 5400 5500 5600 5700 5800 5900 6000 S11 |S11| 0.830 0.797 0.774 0.774 0.774 0.779 0.788 0.794 0.798 0.800 0.803 0.809 0.802 0.803 0.803 0.806 0.801 0.803 0.804 0.809 0.807 0.813 0.818 0.817 0.813 S11 -12.7 -63.4 -101.4 -126.2 -142.5 -153.2 -162.4 -170.0 -176.3 178.0 176.6 175.5 174.8 173.7 172.9 172.1 171.0 170.6 169.7 168.4 167.7 167.0 165.9 165.7 164.6 dB 27.1 25.5 23.0 20.6 18.5 16.7 14.9 13.7 12.6 11.6 11.4 11.1 11.0 10.8 10.6 10.5 10.4 10.1 10.0 9.81 9.69 9.46 9.35 9.11 8.97 S21 |S21| 22.89 18.88 14.21 10.76 8.483 6.893 5.573 4.859 4.306 3.810 3.733 3.616 3.550 3.481 3.426 3.361 3.324 3.223 3.174 3.094 3.054 2.974 2.937 2.854 2.811 S21 171.3 138.8 113.6 94.2 79.9 67.6 57.8 49.8 40.7 32.0 30.2 27.6 26.0 24.5 22.4 21.1 19.8 17.1 15.5 14.1 12.2 10.6 9.1 6.5 5.4 |S12| 0.004 0.016 0.023 0.025 0.026 0.023 0.025 0.023 0.024 0.024 0.019 0.018 0.022 0.018 0.019 0.018 0.022 0.017 0.017 0.012 0.014 0.014 0.013 0.011 0.010 S12 S12 72.6 46.6 28.5 14.3 0.2 -5.9 -7.8 -11.8 -16.5 -27.5 -32.5 -29.4 -39.1 -30.3 -35.8 -34.5 -35.9 -42.7 -29.1 -40.4 -34.7 -44.2 -46.2 -46.4 -44.1 |S22| 0.984 0.837 0.706 0.636 0.599 0.578 0.528 0.516 0.535 0.553 0.564 0.565 0.575 0.571 0.580 0.587 0.591 0.603 0.600 0.604 0.612 0.622 0.621 0.630 0.637 S22 S22 -6.3 -27.0 -40.7 -50.9 -59.5 -69.9 -78.8 -83.0 -88.0 -95.1 -96.5 -97.8 -99.1 -100.1 -102.4 -103.2 -104.9 -106.6 -107.4 -109.4 -110.8 -112.2 -113.6 -115.6 -117.1
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5GHz to 6GHz Low-Noise Amplifier in 6-Pin UCSP MAX2648
Table 2. MAX2648 Typical Noise Parameters
(TA = +25C, VCC = +3.0V, data from design simulation.)
FREQUENCY (MHZ) 5000 5100 5200 5300 5400 5500 5600 5700 5800 5900 6000 FMIN (dB) 1.502 1.528 1.554 1.581 1.613 1.647 1.662 1.672 1.695 1.722 1.750 |OPT| 0.683 0.687 0.690 0.692 0.694 0.696 0.700 0.702 0.705 0.707 0.708 OPT 151.8 159.0 159.8 160.6 161.4 162.2 163.0 163.8 164.6 165.3 166.1 RN () 50.7 52.2 53.7 55.2 56.8 58.5 59.7 60.8 62.3 63.8 65.3
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5GHz to 6GHz Low-Noise Amplifier in 6-Pin UCSP MAX2648
Package Information
6L,UCSP.EPS
8
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