DATA SHEET SKY65084-360LF: 1.5-2.4 GHz Low Noise Amplifier Applications InterStage Match x Wireless infrastructure: GSM, CDMA, WCDMA, and TD-SCDMA x Ultra low-noise applications Features Figure 1. SKY65084-360LF Block Diagram x Ultra-low Noise Figure = 0.70 dB @ 1.95 GHz x Excellent input and output return loss x Adjustable gain = 15 to 25 dB @ 1.95 GHz x High output OIP3 = +34.0 dBm @ 65 mA x OP1dB = +16 dBm @ 1.95 GHz x Single, positive DC supply voltage x Adjustable supply current, 30 to 100 mA x Small, QFN (8-pin, 2 x 2 mm) package (MSL1, 260 qC per JEDEC J-STD-020) Description The SKY65084-360LF is a high performance, two-stage ultra lownoise amplifier. The device is fabricated from Skyworks advanced pHEMT process and is provided in a 2 x 2 mm, 8-pin Quad Flat No-Lead (QFN) package. The device features excellent input and output return loss, and an integrated interstage matching network. The amplifier's ultra-low Noise Figure (NF), high gain, and excellent 3rd Order Intercept point (IP3) allow it to be used in various receiver and transmitter applications. A functional block diagram is shown in Figure 1. The pin configuration and package are shown in Figure 2. Signal pin assignments and functional pin descriptions are provided in Table 1. N/C 8 1 VDD1 RFOUT/VDD2 7 2 RFIN N/C 6 3 BIAS1 FEEDBACK 5 4 BIAS2 Figure 2. SKY65084-360LF Pinout - 8-Pin QFN (Bottom View) Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201107C * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice * November 12, 2009 1 DATA SHEET * SKY65084-360LF LOW NOISE AMPLIFIER Table 1. SKY65084-360LF Signal Descriptions Pin # Name Description Pin # st Name Description 1 VDD1 1 stage DC power supply 5 FEEDBACK Connect to RFOUT to reduce gain of 2nd stage transistor 2 RFIN RF input 6 N/C No connection st 3 BIAS1 Source lead for 1 stage transistor 7 RFOUT/VDD2 RF output. Requires a DC bias using an RF choke inductor. 4 BIAS2 Source lead for 2nd stage transistor 8 N/C No connection 1 8 Inter-Stage Match 2 7 3 6 4 5 S1500 Figure 3. SKY65084-360LF On-Die Functional Diagram Functional Description The SKY65084-360LF is a two stage, low noise amplifier with an integrated interstage matching network. The device has a tested low NF of 0.70 dB and gain of 24 dB. The device allows designers to adjust current and gain without degrading the NF. The external matching network largely dictates the RF performance of the device. The matching network is required for operation and special care should be taken when designing a circuit board layout for the SKY65084-360LF. There are four separate groups of external components: input, output, biasing, and feedback. Figure 3 illustrates the circuit-on-die inside the 2 x 2 mm QFN package. Biasing To properly bias a depletion mode pHEMT, both the gate and drain of the device must be biased properly. At VGS = 0 V and VDS > 2 V, the amplifier stage is in its saturated state and draws the maximum amount of current, IDSS. A VDS of 5 V is recommended to ensure proper performance. To eliminate the need for a negative DC supply, self-biasing should be used when a resistor is placed between one of the source leads and ground. A bypass capacitor should be placed in parallel to this resistor to provide an RF ground and to ensure performance remains unchanged at the operating frequency. When current flows from drain to source and through the resistor, the source voltage becomes biased above DC ground. The gate pin of the device should be left unbiased at 0 V, which creates the desired negative VGS value. This simplifies the design by eliminating the need for a second DC supply. Values for resistor components R1 and R2 can be changed to easily increase or decrease the bias current to a desired level. The first stage is biased at 20 percent of IDSS to achieve the best NF performance. The gain and current of the 2nd stage amplifier can be adjusted without degrading the overall NF. More current in the 2nd stage yields better IP3 performance. Components L3 and L4 are the RF bias choke inductors (refer to Figure 18). These are required to block RF power and pass VDD to the drain of each amplifier stage. Components C5, C6, C7, C9, and C10 are RF bypass capacitors. R3 and R4 reduce the voltage presented at the drain of each stage of the device. The resistor values are optimized for 3rd Order Output Intercept Point (OIP3) and P1dB performance. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 2 November 12, 2009 * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice * 201107C DATA SHEET * SKY65084-360LF LOW NOISE AMPLIFIER Source Inductance Feedback The effect of source inductance varies with frequency. Too little source inductance increases gain and high frequency stability, but at the cost of more in-band instability. Too much source inductance decreases high frequency stability and gain, but improves in-band instability. It is very important to find the optimum tuning of source inductance that balances all variables. Using feedback on the SKY65084-360LF is not necessary, but can be used to reduce gain without affecting other parameters. The default circuit configuration has 25 dB of gain, but can be decreased to about 18 dB by adding feedback components. The board trace present on the first stage transistor (pin 3) is about 60 mils long and 6 mils wide. The electrical length of the line is 9.8 degrees at 1950 MHz. When designing a board for the SKY65084-360LF, these exact dimensions should be used. The board trace length at pin 4 should be minimized. Special care should be taken when making < 1 dB NF measurements. Ideally, measurements should be made in an RF shield room. An Agilent MXA N9020A spectrum analyzer with an internal pre-amp paired with an N4001A smart noise source was used for all noise measurements. The smart noise source has an internal thermocouple that automatically sets the TCOLD setting on the analyzer. If a smart noise source is unavailable, a standard noise source should be used. Use an external thermocouple to manually adjust the TCOLD setting to ensure accurate results. Measuring NF Input and Output RF Matching Network The input band-pass matching network consists of four components. Component C1 serves as the input DC blocking capacitor, C2 provides high frequency stability and improved input return loss, and L1 and L2 are responsible for the best noise match looking into the gate of the first stage amplifier. Electrical and Mechanical Specifications The absolute maximum ratings of the SKY65084-360LF are provided in Table 2. The recommended operating conditions are specified in Table 3 and electrical specifications are provided in Table 4. Excess board trace should be eliminated at the input of the device to minimize board losses. High-Q components should be used to achieve the best NF of the amplifier. Murata GJM series capacitors and Coilcraft HP series inductors are recommended. Any excess board or component loss on the input of the device directly adds to the total measured NF. Performance characteristics for the SKY65084-360LF are illustrated in Figures 4 through 10. The output matching network is band-pass network optimized for output return loss and OIP3 performance. No High-Q components are required for output matching or DC bias. Table 2. SKY65084-360LF Absolute Maximum Ratings Parameter Supply voltage Symbol Minimum Typical Maximum Units VDD 5.5 V Input power PIN +13 dBm Supply current stage one IDS1 50 mA Supply current stage two IDS2 100 mA Power dissipation PDIS 530 mW Junction temperature TJ 150 qC Storage temperature TSTG -65 +125 qC Operating temperature TOP -40 +85 qC Thermal resistance JC Note: 47 qC/W Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other parameters set at or below their nominal value. Exceeding any of the limits listed here may result in permanent damage to the device. CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) 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 should be used at all times. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201107C * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice * November 12, 2009 3 DATA SHEET * SKY65084-360LF LOW NOISE AMPLIFIER Table 3. SKY65084-360LF Recommended Operating Conditions Parameter Symbol Minimum Typical Maximum Units 2.4 GHz Operating frequency f 1.5 Supply voltage VDD 4.75 5.00 5.25 V Supply current IDD 30 65 100 mA Table 4. SKY65084-360LF Electrical Specifications (Note 1) (TOP = +25 qC, Characteristic Impedance [ZO] = 50 , VDD = 5 V, IDD = 65 mA, f = 1950 MHz, Parameters Include Recommended Matching Networks, Unless Otherwise Noted) Parameter Symbol Noise Figure (Note 2) NF Small signal gain |S21| Test Condition Min 23.5 Typical Max Units 0.7 1.0 dB 24.0 24.5 dB Input return loss |S11| 20 dB Output return loss |S22| 20 dB Reverse isolation |S12| 36 dB 3rd Order Input Intercept Point IIP3 5 MHz spacing, PIN = -18 dBm per tone, f = 2000 MHz +10 dBm 3rd Order Output Intercept Point OIP3 5 MHz spacing, PIN = -18 dBm per tone, f = 2000 MHz +34.0 dBm 1 dB Input Compression Point IP1dB f = 2000 MHz -7 dBm 1 dB Output Compression Point OP1dB f = 2000 MHz +16 dBm Stability K Unconditionally stable up to 18 GHz >1 - Note 1: Performance is guaranteed only under the conditions listed in this Table and is not guaranteed over the full operating or storage temperature ranges. Operation at elevated temperatures may reduce reliability of the device. Note 2: Loss from input RF connector and board trace de-embedded from measurement. Typical Performance Characteristics (TOP = +25 qC, Characteristic Impedance [ZO] = 50 , VDD = 5 V, IDD = 65 mA, Parameters Include a Recommended High Gain 1950 MHz Matching Network, Unless Otherwise Noted) 0 30 -5 Input Return Loss (dB) Small Signal Gain (dB) 25 20 15 10 o +85 C +25 oC -40 oC 5 0 1500 1700 1900 2100 2300 -10 -15 -20 -25 +85 oC +25 oC -40 oC -30 -35 2500 Frequency (MHz) Figure 4. Small Signal Gain vs Frequency Over Temperature, PIN = -20 dBm -40 1500 1700 1900 2100 2500 Figure 5. Intput Return Loss vs Frequency Over Temperature, PIN = -20 dBm Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 4 2300 Frequency (MHz) November 12, 2009 * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice * 201107C DATA SHEET * SKY65084-360LF LOW NOISE AMPLIFIER 0 0 Reverse Isolation (dB) -10 Output Return Loss (dB) +85 oC +25 oC -40 oC -20 -30 -40 -50 -60 1500 1700 1900 2100 2300 -5 -10 -15 -20 +85 oC +25 oC -40 oC -25 -30 1500 2500 1700 1900 2100 2300 2500 Frequency (MHz) Frequency (MHz) Figure 7. Output Return Loss vs Frequency Over Temperature, PIN = -20 dBm Figure 6. Reverse Isolation vs Frequency Over Temperature, PIN = -20 dBm 1.2 +38 1.0 +36 OIP3 (dBm) NF (dB) 0.8 0.6 0.4 +85 oC +25 oC -40 oC 0.2 0 1700 1800 1900 2000 +34 +32 +85 oC +25 oC -40 oC +30 +28 1700 2100 1800 1900 2000 2100 Frequency (MHz) Frequency (MHz) Figure 9. Third Order Output Intercept Point vs Frequency Over Temperature, PIN = -18 dBm/Tone, 5 MHz Tone Spacing Figure 8. Noise Figure vs Frequency Over Temperature, Input RF Connector and Board Trace De-Embedded From Measurement -4.0 +85 oC +25 oC -40 oC -4.5 IP1dB (dBm) -5.0 -5.5 -6.0 -6.5 -7.0 -7.5 -8.0 1700 1800 1900 2000 2100 Frequency (MHz) Figure 10. Input 1 dB Compression vs Frequency Over Temperature Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201107C * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice * November 12, 2009 5 DATA SHEET * SKY65084-360LF LOW NOISE AMPLIFIER Evaluation Board Description Package Dimensions The SKY65084-360LF Evaluation Board is used to test the performance of the SKY65084-360LF low noise amplifier. An assembly drawing for the Evaluation Board is shown in Figure 11 and an Evaluation Board schematic diagram is shown in Figure 12. Table 5 provides the Evaluation Board Bill of Materials (BOM) list. The PCB layout footprint for the SKY65084-360LF is shown in Figure 13. Typical case markings are noted in Figure 14. Package dimensions for the 8-pin QFN are shown in Figure 15, and tape and reel dimensions are provided in Figure 16. Input and output traces have been minimized to reduce losses. All surface mount components are 0402-sized to reduce component parasitics. The use of 0603 or larger components is not recommended. Component spacing has also been minimized. The board is provisioned with two RF connectors and a DC launch. The RF connector and board loss up to component C1 is approximately 0.1 dB at 1.95 GHz. It is very important to place multiple ground vias as close to shunt components as possible. This ensures proper grounding and circuit performance. Board material is 10 mil thick VT47 FR4 with 1 oz. copper cladding. RF traces are 50 with a 17.5 mil trace width and a 10 mil gap to ground. Evaluation Board Test Procedure Package and Handling Information Instructions on the shipping container label regarding exposure to moisture after the container seal is broken must be followed. Otherwise, problems related to moisture absorption may occur when the part is subjected to high temperature during solder assembly. THE SKY65084-360LF is rated to Moisture Sensitivity Level 1 (MSL1) at 260 qC. It can be used for lead or lead-free soldering. For additional information, refer to the Skyworks Application Note, Solder Reflow Information, document number 200164. Care must be taken when attaching this product, whether it is done manually or in a production solder reflow environment. Production quantities of this product are shipped in a standard tape and reel format. For packaging details, refer to the Skyworks Application Note, Discrete Devices and IC Switch/Attenuators Tape and Reel Package Orientation, document number 200083. Step 1: Connect RF test equipment to amplifier input/output SMA connectors. Step 2: Connect DC ground. Step 3: Connect VDD to a +5 V supply with a current limit of 100 mA. Verify that the board draws approximately 65 mA. Step 4: Apply RF signal or noise source. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 6 November 12, 2009 * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice * 201107C DATA SHEET * SKY65084-360LF LOW NOISE AMPLIFIER C10 R4 R3 C7 C9 C3 R1 R5 C4 R2 C8 L5 C11 L1 C2 C1 L2 L4 L3 C6 C5 C1, L1, and L2 comprise the input matching network C8, L4, and L5 comprise the output matching network. R1, R3, and C3 are the bias components for the 1st stage transistor. R2, R4, and C4 are the bias components for the 2nd stage transistor. C3, C4, C6, C7, C9, and C10 are RF decoupling capacitors. L3 and L4 are RF choke inductors. R5 and C11 provide RF feedback to adjust gain S1577 Figure 11. SKY65084-360LF Evaluation Board Assembly Diagram Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201107C * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice * November 12, 2009 7 DATA SHEET * SKY65084-360LF LOW NOISE AMPLIFIER VDD C10 C7 R3 R4 C6 C9 C5 L3 L4 8 1 L2 VDD1 C1 C2 L1 RFIN 3 R1 RFOUT/VDD2 SKY65084 C8 BIAS1 N/C BIAS2 FEEDBACK L5 RF Output 6 R5 x C11 5 4 R2 x 7 2 RF Input N/C C4 C3 S1576 Figure 12. SKY65084-360LF Evaluation Board Schematic Diagram Table 5. Recommended Evaluation Board Bill of Materials Component Value Size Manufacturer Component Value Size Manufacturer C1 20 pF 0402 Murata GJM series L1 5.6 nH 0402 Coilcraft HP series C2 0.4 pF 0402 Murata GJM series L2 7.5 nH 0402 Coilcraft CS series C3 1000 pF 0402 Murata GRM series L3 6.8 nH 0402 TDK MLG series C4 1000 pF 0402 Murata GRM series L4 18 nH 0402 TDK MLG series C5 8.2 pF 0402 Murata GRM series L5 4.7 nH 0402 TDK MLG series C6 0.3 pF 0402 Murata GJM series R1 20 0402 Panasonic C7 1000 pF 0402 Murata GRM series R2 9.1 0402 Panasonic C8 47 pF 0402 Murata GRM series R3 120 0402 Panasonic C9 1000 pF 0402 Murata GRM series R4 36 0402 Panasonic C10 0.3 pF 0402 Murata GJM series R5 1.1 k 0402 Panasonic C11 0.3 pF 0402 Murata GJM series Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 8 November 12, 2009 * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice * 201107C DATA SHEET * SKY65084-360LF LOW NOISE AMPLIFIER 8X 0.70 8X 0.45 R0.20 Pin 1 8X 0.25 0.50 Pitch 2X 0.85 0.25 Exposed Solder Areas (Typical) 2X 0.45 All dimensions are in millimeters S1413 Figure 13. SKY65084-360LF PCB Layout Footprint Pin 1 Indicator S84 Skyworks Part # Figure 14. Typical Case Markings Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201107C * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice * November 12, 2009 9 DATA SHEET * SKY65084-360LF LOW NOISE AMPLIFIER 0.90 +0.10/-0.15 C 0.20 Ref Seating Plane A 2 B 0.45 +0.05/-0.07 Exposed Pad Detail A 0.02 +0.03/-0.02 Pin 1 Indicator -B- 2 0.15 C 2X 8X 3 0.08 C Detail C 0.90 0.10 0.15 C 2X 1.70 +0.10/-0.15 0.85 +0.05/-0.07 Detail B 2 Places 0.10 C Top View Side View Bottom View R0.12 Typ 0.25 0.30 0.10 -A- CL R0.20 0.5 0.25 +0.05/-0.07 5 0.10 M C A B 0.05 M C Detail C Detail B 8 Places Detail A All measurements are in millimeters. Dimensioning and tolerancing according to ASME Y14.5M-1994. Coplanarity applies to the exposed heat sink slug as well as the terminals.. Plating requirement per source control drawing (SCD) 2504. Dimension applies to metalized terminal and is measured between 0.15 mm and 0.30 mm from terminal tip. S1415 Figure 15. SKY65084-360LF 8-Pin QFN Package Dimensions 1.50+ P0.10/-0.00 0.30 0.01 (T) Pin #1 4.00 0.10 4.00 0.10 2.00 0.05 1.75 0.10 B A B 8.00 +0.30/-0.10 A 3.50 0.05 2.60 0.10 (Bo) R0.30 Max 1.00 Min. 1.20 0.10 (Ko) 2.60 0.10 (Ao) B R0.30 Max A Notes: 1. Carrier tape: black conductive polystyrene. 2. Cover tape material: transparent conductive HSA. 3. Cover tape size: 5.40 mm width. 4. All measurements are in millimeters. S1480 Figure 16. SKY65084-360LF Tape and Reel Dimensions Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 10 November 12, 2009 * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice * 201107C DATA SHEET * SKY65084-360LF LOW NOISE AMPLIFIER Ordering Information Model Name SKY65084-360LF Low Noise Amplifier Manufacturing Part Number SKY65084-360LF (Pb-free package) Evaluation Board Part Numbers SKY65084-360LF EVB Copyright (c) 2009 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. No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or 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 Conditions of Sale. THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 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 * sales@skyworksinc.com * www.skyworksinc.com 201107C * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice * November 12, 2009 11