DATA SHEET SKY65066-360LF: 2.3-2.7 GHz Low Noise Amplifier Applications InterStage Match x Wireless infrastructure: WLAN, Bluetooth, WiMAX, LTE, and WCDMA x Ultra-low noise applications Figure 1. SKY65066-360LF Block Diagram Features x Ultra-low Noise Figure = 0.70 dB @ 2.5 GHz x Excellent input and output return loss x Adjustable gain = 16.5 to 20.5 dB @ 2.5 GHz x High output OIP3 = +35.5 dBm @ 75 mA x OP1dB = +18 dBm @ 2.5 GHz x Single, positive DC supply voltage x Adjustable supply current, 30 to 100 mA x Integrated on-die source inductors and interstage matching network Description x Small, QFN (8-pin, 2 x 2 mm) package (MSL1, 260 qC per JEDEC J-STD-020) 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. The SKY65066-360LF is a high performance, two-stage ultra-Low Noise Amplifier (LNA). 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. BIAS1 1 8 BIAS2 RFIN 2 7 RFOUT/VDD2 N/C 3 6 N/C VDD1 4 5 FEEDBACK Figure 2. SKY65066-360LF Pinout – 8-Pin QFN (Top View) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201090E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 12, 2009 1 DATA SHEET • SKY65066-360LF LOW NOISE AMPLIFIER Table 1. SKY65066-360LF Signal Descriptions Pin # Name Description st Pin # Name Description 1 BIAS1 Source lead for 1 stage transistor 5 FEEDBACK Connect to RFOUT/VDD2 to reduce gain of 2nd stage transistor 2 RFIN RF input 6 N/C No connection 3 N/C No connection 7 RFOUT/VDD2 RF output. Requires a DC bias using an RF choke inductor. 4 VDD1 1st stage DC power supply 8 BIAS2 Source lead for 2nd stage transistor Functional Description Source Inductance The SKY65066-360LF is a two stage LNA with an integrated interstage matching network and source inductors. The device has a tested low NF of 0.7 dB and gain of 16.5 dB. The device allows designers to adjust current and gain without degrading the NF. The source inductance required on pins 1 and 8 (BIAS1 and BIAS2 signals, respectively) has been integrated on the die. This simplifies board layout and reduces build variations. 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 SKY65066-360LF. There are four separate groups of external components: input, output, biasing, and feedback. 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. 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. Input and Output RF Matching Network 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 or CS series inductors are recommended. Any excess board or component loss on the input of the device directly adds to the total measured NF. The output matching network is band-pass network optimized for output return loss. The SKY65066-360LF Evaluation Board assembly diagram is shown in Figure 13 and a circuit schematic is provided in Figure 14. Feedback Feedback is implemented in the recommended circuit on the 2nd stage transistor. Feedback improves the input and output return loss and high frequency stability. The gain of the device can be increased by increasing the value of R3, which reduces the amount of feedback present (gain for multiple feedback resistor values is shown in Figure 12). 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. Biasing components R1, R2, C1, and C2 should be placed as close to the package pins as possible. See Figure 12 for the recommended board layout. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 November 12, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201090E DATA SHEET • SKY65066-360LF LOW NOISE AMPLIFIER Measuring NF Electrical and Mechanical Specifications 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 low Excess Noise Ratio (ENR) source should be used. Use an external thermocouple to manually adjust the TCOLD setting to ensure accurate results. The absolute maximum ratings of the SKY65066-360LF are provided in Table 2. The recommended operating conditions are specified in Table 3 and electrical specifications are provided in Table 4. Performance characteristics for the SKY65066-360LF are illustrated in Figures 3 through 12. Table 2. SKY65066-360LF Absolute Maximum Ratings Parameter Supply voltage Symbol Minimum Typical Maximum Units VDD 5.5 V Input power PIN +10 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 QJC Note: qC/W 47 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. 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. Table 3. SKY65066-360LF Recommended Operating Conditions Parameter Symbol Minimum Typical Maximum Units 2.7 GHz Operating frequency f 2.3 Supply voltage VDD 4.75 5.00 5.25 V Supply current IDD 30 75 100 mA Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201090E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 12, 2009 3 DATA SHEET • SKY65066-360LF LOW NOISE AMPLIFIER Table 4. SKY65066-360LF Electrical Specifications (Note 1) (TOP = +25 qC, Characteristic Impedance [ZO] = 50 Ω, VDD = 5 V, IDD = 75 mA, f = 2.5 GHz, Parameters Include Recommended 2.3 to 2.7 GHz Matching Network, Unless Otherwise Noted) Parameter Symbol Noise Figure (Note 2) NF Gain |S21| Test Condition Min Typical Max 0.7 0.9 15.0 16.5 Units dB dB Input return loss |S11| –20 dB Output return loss |S22| –14 dB Reverse isolation |S12| –27 dB rd 3 Order Output Intercept Point OIP3 10 MHz spacing, PIN = –18 dBm per tone +35.5 dBm 3rd Order Input Intercept Point IIP3 10 MHz spacing, PIN = –18 dBm per tone +19 dBm 1 dB Output Compression Point OP1dB +18 dBm 1 dB Input Compression Point IP1dB +2.5 dBm >1 K Stability Unconditionally stable up to 18 GHz 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. Exceeding any of the conditions listed here may result in permanent damage to the device. Operation at elevated temperatures may reduce reliability of the device. Note 2: NF of device and matching network. Input RF connector and board loss de-embedded from measurement. Typical Performance Characteristics (TOP = +25 qC, Characteristic Impedance [ZO] = 50 Ω, VDD = 5 V, IDD = 75 mA, Parameters Include a Recommended 2.3 to 2.7 GHz Matching Network, Unless Otherwise Noted) 0 +85 oC +25 oC –40 oC –5 20 Input Return Loss (dB) Small Signal Gain (dB) 25 15 10 o +85 C +25 oC –40 oC 5 –10 –15 –20 –25 –30 –35 0 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 Frequency (GHz) Figure 3. Small Signal Gain vs Frequency Over Temperature, (PIN = –20 dBm) –40 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.9 3.0 Figure 4. Input Return Loss vs Frequency Over Temperature, (PIN = –20 dBm) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 2.8 Frequency (GHz) November 12, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201090E DATA SHEET • SKY65066-360LF LOW NOISE AMPLIFIER 0 0 +85 oC +25 oC –40 oC –10 –2 Output Return Loss (dB) Reverse Isolation (dB) –5 –15 –20 –25 –30 –35 –40 –45 –50 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 –6 –8 –10 –12 –14 –16 –18 –20 3.0 +85 oC +25 oC –40 oC –4 2.0 2.1 2.2 2.3 Frequency (GHz) 2.4 2.5 2.6 2.7 2.8 Figure 5. Reverse Isolation vs Frequency Over Temperature, (PIN = –20 dBm) +40 1.2 +39 +85 oC +25 oC –40 oC +37 OIP3 (dBm) Noise Figure (dB) +38 1.0 0.8 0.6 0.4 +85 oC +25 oC –40 oC 0.2 2.35 2.40 2.45 2.50 2.55 2.60 2.65 +36 +35 +34 +33 +32 +31 +30 2.35 2.70 2.40 2.45 Frequency (GHz) 2.65 2.70 2.75 +38 18 17 16 +36 OIP3 (dBm) Gain (dB) 2.60 +40 19 15 14 10 –20 2.55 Figure 8. OIP3 vs Frequency Over Temperature, (PIN = –20 dBm) 20 11 2.50 Frequency (GHz) Figure 7. Noise Figure vs Frequency Over Temperature, Input RF Connector and Board Trace De-Embedded From Measurement 13 12 3.0 Figure 6. Output Return Loss vs Frequency Over Temperature, (PIN = –20 dBm) 1.4 0 2.30 2.9 Frequency (GHz) +34 +32 +30 2500 MHz +85 oC 2400 MHz +25 oC 2600 MHz –40 oC –15 2400 MHz +85 oC 2700 MHz +25oC 2500 MHz –40 oC –10 2700 MHz +85 oC 2600 MHz +25 oC 2400 MHz –40 oC –5 0 2600 MHz +85 oC 2500 MHz +25 oC 2700 MHz –40 oC +5 +28 +10 Input Power (dBm) Figure 9. Gain vs Input Power Over Temperature and Frequency +26 –16 2400 MHz +85 oC 2400 MHz +25 oC 2400 MHz –40 oC –14 –12 –10 2700 MHz +85 oC 2700 MHz +25 oC 2700 MHz –40 oC 2600 MHz +85 oC 2600 MHz +25 oC 2600 MHz –40 oC 2500 MHz +85 oC 2500 MHz +25oC 2500 MHz –40 oC –8 –6 –4 –2 0 Input Power Per Tone (dBm) Figure 10. OIP3 vs Input Power Over Temperature and Frequency (Tone Spacing = 5 MHz) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201090E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 12, 2009 5 DATA SHEET • SKY65066-360LF LOW NOISE AMPLIFIER 8 μ1 –40 oC μ1 +25 oC μ1 +85 oC 6 22 μ2 –40 oC μ2 +25 oC μ2 +85 oC 5 μ1, μ2 24 Small Signal Gain (dB) 7 4 3 2 1 20 18 16 10 Ω 50 Ω 100 Ω 200 Ω 500 Ω Removed 14 12 0 0 2 4 6 8 10 12 14 16 18 10 2.30 2.35 2.40 2.45 Frequency (GHz) Figure 11. Stability vs Frequency Over Temperature (PIN = –20 dBm) 2.50 2.55 2.60 2.65 2.70 Frequency (GHz) Figure 12. Small Signal Gain vs Frequency for Multiple Feedback Resistor Values Evaluation Board Description Package Dimensions The SKY65066-360LF Evaluation Board is used to test the performance of the SKY65066-360LF low noise amplifier. An assembly drawing for the Evaluation Board is shown in Figure 13. The Evaluation Board schematic diagram is shown in Figure 14. Table 5 provides the Bill of Materials (BOM) list for Evaluation Board components. The PCB layout footprint for the SKY65066-360LF is shown in Figure 15. Typical case markings are shown in Figure 16. Package dimensions for the 8-pin QFN are shown in Figure 17, and tape and reel dimensions are provided in Figure 18. Input and output trace lengths 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 1 dB at 2500 MHz. 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 input and output traces are 50 Ω. 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 SKY65066-360LF is rated to Moisture Sensitivity Level 1 (MSL1) at 260 qC. It can be used for lead or lead-free soldering. 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 75 mA. Step 4: Apply RF signal or noise source. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 November 12, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201090E PRELIMINARY DATA SHEET • SKY65066-360LF LOW NOISE AMPLIFIER S1513 Figure 13. SKY65066-360LF Evaluation Board Assembly Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 7 November 12, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201090E DATA SHEET • SKY65066-360LF LOW NOISE AMPLIFIER C4 1 C1 L2 BIAS1 BIAS2 R2 8 C3 C9 2 RF Input C14 C5 R1 RF Output L1 C8 C7 C2 × 3 N/C N/C 6 R3 C11 FEEDBACK 5 VDD1 C15 L4 × C6 4 C16 RFOUT/VDD2 7 RFIN C18 L3 L5 R5 C13 C10 C17 R4 C12 C19 VDD Note: Some component labels may be different than the corresponding component symbol shown here. Component values, however, as noted in Table 5, are accurate as of the date of this Data Sheet. S1514 Figure 14. SKY65066-360LF Evaluation Board Schematic Table 5. SKY65066-360LF (QFN Package) Evaluation Board Bill of Materials (1 of 2) Component Value Size Manufacturer/Part Series C1 30 pF 0402 Murata GRM1555C C2 7.5 nH 0402 Coilcraft CS C3, C8, C10, C12, C14, C19 DNP C4 30 pF 0402 Murata GRM1555C C5 4700 pF 0402 Murata GRM1555C C6 0.3 pF 0402 Murata GJM1555C C7 51 Ω 0402 Panasonic ERJ2RKF C9 2.4 pF 0402 Murata GJM1555C C11 0.4 pF 0402 Murata GJM1555C C13 1000 pF 0402 Murata GRM1555C C15 0.1 pF 0402 Murata GJM1555C C16 2.0 nH 0402 TDK MLG1005S C17 6 pF 0402 Murata GJM1555C C18 10 pF 0402 Murata GJM1555C L1 0.1 pF 0402 Murata GJM1555C L2 1.2 nH 0402 Coilcraft CS L3 27 nH 0402 TDK MLG1005S L4 5.6 nH 0402 TDK MLG1005S L5 5.6 nH 0402 TDK MLG1005S Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 November 12, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201090E DATA SHEET • SKY65066-360LF LOW NOISE AMPLIFIER Table 5. SKY65066-360LF (QFN Package) Evaluation Board Bill of Materials (2 of 2) Component Value Size Manufacturer/Part Series 22 Ω 0402 Panasonic ERJ2RKF R2 6.8 Ω 0402 Panasonic ERJ2GE R3 DNP R4 91 Ω 0402 Panasonic ERJ2RKF R5 22 Ω 0402 Panasonic ERJ2RKF R1 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 15. SKY65066-360LF PCB Layout Footprint Pin 1 Indicator S66 Skyworks Part # Figure 16. Typical Case Markings (Top View) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201090E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 12, 2009 9 DATA SHEET • SKY65066-360LF 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 Detail C 0.08 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 17. SKY65066-360LF 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 18. SKY65066-360LF Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 10 November 12, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201090E DATA SHEET • SKY65066-360LF LOW NOISE AMPLIFIER Ordering Information Model Name SKY65066-360LF Low Noise Amplifier Manufacturing Part Number SKY65066-360LF (Pb-free and Green package) Evaluation Kit Part Number SKY65066-360LF (2.3-2.7 GHz) Copyright © 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. 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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 • [email protected] • www.skyworksinc.com 201090E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 12, 2009 11