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HMC-ALH244
v01.0108
GaAs HEMT MMIC LOW NOISE AMPLIFIER, 24 - 40 GHz
Features
Noise Figure: 3.5 dB Gain: 12 dB
1
LOW NOISE AMPLIFIERS - CHIP
Typical Applications
This HMC-ALH244 is ideal for: * Point-to-Point Radios * Point-to-Multi-Point Radios
P1dB Output Power: +13 dBm * VSAT Supply Voltage: +4V @ 45 mA * SATCOM Die Size: 2.50 x 1.4 x 0.1 mm
Functional Diagram
General Description
The HMC-ALH244 is a two stage GaAs MMIC HEMT Low Noise Amplifier die which operates between 24 and 40 GHz. The amplifier provides 12 dB of gain, a noise figure of 3.5 dB, and requires only 45 mA from a +4V supply voltage. The HMC-ALH244 amplifier die is ideal for integration into Multi-Chip-Modules (MCMs) due to its small size (3.5 mm2).
Electrical Specifi cations [1], TA = +25 C, Vdd= 4V, Idd = 45mA [2]
Parameter Frequency Range Gain Noise Figure Input Return Loss Output Return Loss Output Power for 1 dB Compression Supply Current (Idd) [1] Unless otherwise indicated, all measurements are from probed die [2] Adjust Vgg between -1V to +0.3V (-0.2V Typ.) to achieve Iddtotal = 45 mA 10 Min. Typ. 24 - 40 12 3.5 15 17 13 45 100 4 Max. Units GHz dB dB dB dB dBm mA
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For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
HMC-ALH244
v01.0108
GaAs HEMT MMIC LOW NOISE AMPLIFIER, 24 - 40 GHz
Linear Gain vs. Frequency
16 14
Noise Figure vs. Frequency
5
1
LOW NOISE AMPLIFIERS - CHIP
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4 10 8 6 4 2 0 20 25 30 35 40 45 FREQUENCY (GHz) 0 20 25 30 35 40 45 FREQUENCY (GHz) NOISE FIGURE (dB) RETURN LOSS (dB) 20 25 30 35 40 45 12 GAIN (dB)
3
2
1
Input Return Loss vs. Frequency
0 -5 RETURN LOSS (dB) -10 -15 -20 -25 -30 FREQUENCY (GHz)
Output Return Loss vs. Frequency
0 -5 -10 -15 -20 -25 -30 20 25 30 35 40 45 FREQUENCY (GHz)
For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
HMC-ALH244
v01.0108
GaAs HEMT MMIC LOW NOISE AMPLIFIER, 24 - 40 GHz
1
LOW NOISE AMPLIFIERS - CHIP
Absolute Maximum Ratings
Drain Bias Voltage Gate Bias Voltage RF Input Power Channel Temperature Storage Temperature Operating Temperature +5.5 Vdc -1 to +0.3 Vdc 6 dBm 180 C -65 to +150 C -55 to +85 C
ELECTROSTATIC SENSITIVE DEVICE OBSERVE HANDLING PRECAUTIONS
Outline Drawing
Die Packaging Information [1]
Standard WP - 10 Alternate [2]
NOTES: 1. ALL DIMENSIONS ARE IN INCHES [MM]. 2. TYPICAL BOND PAD IS .004" SQUARE. 3. BACKSIDE METALLIZATION: GOLD. 4. BACKSIDE METAL IS GROUND. 5. BOND PAD METALLIZATION: GOLD. 6. CONNECTION NOT REQUIRED FOR UNLABELED BOND PADS. 7. OVERALL DIE SIZE .002"
[1] Refer to the "Packaging Information" section for die packaging dimensions. [2] For alternate packaging information contact Hittite Microwave Corporation.
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For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
HMC-ALH244
v01.0108
GaAs HEMT MMIC LOW NOISE AMPLIFIER, 24 - 40 GHz
Pad Descriptions
Pad Number Function Description This pad is AC coupled and matched to 50 Ohms. Interface Schematic
1
RFIN
1
2, 6
Vdd
Power Supply Voltage for the amplifier. See assembly for required external components.
3, 5
Vgg
Gate control for amplifier. Please follow "MMIC Amplifier Biasing Procedure" application note. See assembly for required external components.
4
RFOUT
This pad is AC coupled and matched to 50 Ohms.
Die bottom
GND
Die bottom must be connected to RF/DC ground.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
1 - 135
LOW NOISE AMPLIFIERS - CHIP
HMC-ALH244
v01.0108
GaAs HEMT MMIC LOW NOISE AMPLIFIER, 24 - 40 GHz
1
LOW NOISE AMPLIFIERS - CHIP
Assembly Diagram
Note 1: Bypass caps should be 100 pF (approximately) ceramic (single-layer) placed no farther than 30 mils from the amplifier Note 2: Best performance obtained from use of <10 mil (long) by 3 by 0.5mil ribbons on input and output.
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For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
HMC-ALH244
v01.0108
GaAs HEMT MMIC LOW NOISE AMPLIFIER, 24 - 40 GHz
Mounting & Bonding Techniques for Millimeterwave GaAs MMICs
The die should be attached directly to the ground plane eutectically or with conductive epoxy (see HMC general Handling, Mounting, Bonding Note). 50 Ohm Microstrip transmission lines on 0.127mm (5 mil) thick alumina thin film substrates are recommended for bringing RF to and from the chip (Figure 1). If 0.254mm (10 mil) thick alumina thin film substrates must be used, the die should be raised 0.150mm (6 mils) so that the surface of the die is coplanar with the surface of the substrate. One way to accomplish this is to attach the 0.102mm (4 mil) thick die to a 0.150mm (6 mil) thick molybdenum heat spreader (moly-tab) which is then attached to the ground plane (Figure 2). Microstrip substrates should be placed as close to the die as possible in order to minimize bond wire length. Typical die-to-substrate spacing is 0.076mm to 0.152 mm (3 to 6 mils).
0.102mm (0.004") Thick GaAs MMIC
Wire Bond 0.076mm (0.003")
1
LOW NOISE AMPLIFIERS - CHIP
1 - 137
RF Ground Plane
0.127mm (0.005") Thick Alumina Thin Film Substrate Figure 1.
Handling Precautions
Follow these precautions to avoid permanent damage. Storage: All bare die are placed in either Waffle or Gel based ESD protective containers, and then sealed in an ESD protective bag for shipment. Once the sealed ESD protective bag has been opened, all die should be stored in a dry nitrogen environment. Cleanliness: Handle the chips in a clean environment. DO NOT attempt to clean the chip using liquid cleaning systems. Static Sensitivity: strikes. Follow ESD precautions to protect against ESD
0.150mm (0.005") Thick Moly Tab 0.254mm (0.010") Thick Alumina Thin Film Substrate Figure 2.
0.102mm (0.004") Thick GaAs MMIC
Wire Bond 0.076mm (0.003")
RF Ground Plane
Transients: Suppress instrument and bias supply transients while bias is applied. Use shielded signal and bias cables to minimize inductive pick-up.
General Handling: Handle the chip along the edges with a vacuum collet or with a sharp pair of bent tweezers. The surface of the chip has fragile air bridges and should not be touched with vacuum collet, tweezers, or fingers.
Mounting
The chip is back-metallized and can be die mounted with AuSn eutectic preforms or with electrically conductive epoxy. The mounting surface should be clean and flat. Eutectic Die Attach: A 80/20 gold tin preform is recommended with a work surface temperature of 255 C and a tool temperature of 265 C. When hot 90/10 nitrogen/hydrogen gas is applied, tool tip temperature should be 290 C. DO NOT expose the chip to a temperature greater than 320 C for more than 20 seconds. No more than 3 seconds of scrubbing should be required for attachment. Epoxy Die Attach: Apply a minimum amount of epoxy to the mounting surface so that a thin epoxy fillet is observed around the perimeter of the chip once it is placed into position. Cure epoxy per the manufacturer's schedule.
Wire Bonding
RF bonds made with 0.003" x 0.0005" ribbon are recommended. These bonds should be thermosonically bonded with a force of 40-60 grams. DC bonds of 0.001" (0.025 mm) diameter, thermosonically bonded, are recommended. Ball bonds should be made with a force of 40-50 grams and wedge bonds at 18-22 grams. All bonds should be made with a nominal stage temperature of 150 C. A minimum amount of ultrasonic energy should be applied to achieve reliable bonds. All bonds should be as short as possible, less than 12 mils (0.31 mm).
For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com

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