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skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@sk yworksinc.com ? www.skyworksinc.com 201046b ? skyworks proprietary and confiden tial information ? produc ts and product information ar e subject to change witho ut notice ? may 19, 2009 1 data sheet SKY65037-360LF: 0.7-1.2 ghz low noise amplifier applications ? wireless infrastructure: gsm, cdma, wcdma, ism, and td-scdma ? ultra-low noise applications features ? ultra-low noise figure = 0.60 db @ 850 mhz ? excellent input and output return loss ? adjustable gain = 15 to 25 db @ 850 mhz ? high output oip3 = +33.5 dbm @ 75 ma ? op1db = +18 dbm @ 850 mhz ? single, positive dc supply voltage ? adjustable supply current, 30 to 100 ma ? small, qfn (8-pin, 2 x 2 mm) pb-free package (msl1, 260 c per jedec j-std-020) inter- s tage match figure 1. SKY65037-360LF block diagram description the SKY65037-360LF is a high performance, two-stage ultra-low noise 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 amplifiers ultra-low noise figure (nf), high gain, and excellent 3 rd 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. 4 3 2 1 5 6 7 8 vdd1 rfin bia s 1 bia s 2 n/ c rfout/vdd2 n/ c feedba c k figure 2. SKY65037-360LF pinout C 8-pin qfn (top view)
data sheet ? SKY65037-360LF low noise amplifier skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@sk yworksinc.com ? www.skyworksinc.com 2 may 19, 2009 ? skyworks proprietary and confidential information ? products a nd product information are subject to change without notice ? 201046b table 1. SKY65037-360LF signal descriptions pin # name description pin # name description 1 vdd 1 st stage dc power supply 5 feedback connect to rfout to reduce gain of 2 nd stage transistor 2 rfin rf input 6 n/c no connection 3 bias1 source lead for 1 st stage transistor 7 rfout/vdd rf out put. requires a dc bias using an rf choke inductor. 4 bias2 source lead for 2 nd stage transistor 8 n/c no connection functional description the SKY65037-360LF is a two stage, low noise amplifier with an integrated interstage matching network. the device has a tested low nf of 0.60 db and gain of 18.5 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 SKY65037-360LF. there are four separate groups of external components: input, output, biasing, and feedback. biasing to properly bias a depletion mode phemt, both the gate and drain of the device must be biased properly. at v gs = 0 v and v ds > 2 v, the amplifier stage is in its saturated state and draws the maximum amount of current, i dss . a v ds 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 v gs 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 i dss to achieve the best nf performance. the gain and current of the 2 nd stage amplifier can be adjusted without degrading the overall nf. more current in the 2 nd stage yields better ip3 performance. components l3 and l5 are the rf bias choke inductors. these are required to block rf power and pass v dd to the drain of each amplifier stage. components c5, c6, c9, and c10 are rf bypass capacitors. r5 and r6 reduce the voltage presented at the drain of each stage of the device. the resistor values are optimized for 3 rd order output intercept point (oip3) and p1db performance. source inductance 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. the trace present on the first stage amplifier (pin 3) is about 160 mils long and about 6 mils wide. the electrical length of the line is 7.3 degrees at 900 mhz. when designing a board for the SKY65037-360LF, these exact dimensions should be used. the board trace length at pin 4 should be minimized. 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. 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 SKY65037-360LF evaluation board assembly diagram is shown in figure 10 and a circuit schematic is provided in figure 11. feedback using feedback on the SKY65037-360LF is not necessary, but can be used to reduce gain without affecting other parameters. the default circuit configuration has 18.5 db of gain, but can be increased to about 25 db by removing feedback components. a recommended circuit that does not incorporate feedback is available upon request.
data sheet ? SKY65037-360LF low noise amplifier skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@sk yworksinc.com ? www.skyworksinc.com 201046b ? skyworks proprietary and confiden tial information ? produc ts and product information ar e subject to change witho ut notice ? may 19, 2009 3 measuring nf special care should be taken when making < 1 db nf measurements. ideally, measurements should be made in an rf shield room. an agilent mxa n 9020a 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 t cold 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 t cold setting to ensure accurate results. electrical and mechanical specifications the absolute maximum ratings of the SKY65037-360LF 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 SKY65037-360LF are illustrated in figures 3 through 9. table 2. SKY65037-360LF absolute maximum ratings parameter symbol minimum typical maximum units supply voltage v dd 5.5 v input power p in +15 dbm supply current stage one i ds 1 100 ma supply current stage two i ds 2 100 ma power dissipation p dis 240 mw channel temperature t j 150 c storage temperature t stg C65 +125 c operating temperature t op C40 +85 c thermal resistance q jc 47 c/w note: exposure to maximum rating conditions for extended periods may reduce device reliability. there is no damage to device with on ly one parameter set at the limit and all other parameters set at or below their nominal value. table 3. SKY65037-360LF recommended operating conditions parameter symbol minimum typical maximum units supply voltage v dd 4.75 5.00 5.25 v supply current i dd 30 75 100 ma table 4. SKY65037-360LF electrical specifications (t op = +25 c, characteristic impedance [z o ] = 50 , v dd = 5 v, i dd = 75 ma, f = 850 mhz, parameters include a recommended 700-1000 mhz matching network, unless otherwise noted) parameter symbol test condi tion min typical max units noise figure (note 1) nf 0.6 1.0 db small signal gain |s 21 | 17.0 18.5 20.0 db input return loss |s11| C22 db output return loss |s22| C22 db reverse isolation |s12| C30 db 3 rd order output intercept point oip3 10 mhz spacing, p in = C18 dbm per tone, i dd = 75 ma +33.5 dbm 1 db output compression point op1db +17.5 dbm stability unconditionally stable up to 18 ghz >1 k note 1 : loss from input rf connector and boar d trace de-embedded from measurement.
data sheet ? SKY65037-360LF low noise amplifier skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@sk yworksinc.com ? www.skyworksinc.com 4 may 19, 2009 ? skyworks proprietary and confidential information ? products a nd product information are subject to change without notice ? 201046b typical performance characteristics (t op = +25 c, characteristic impedance [z o ] = 50 , v dd = 5 v, i dd = 75 ma, parameters include a recommended 700-1000 mhz matching network, unless otherwise noted) 5 10 15 20 0 25 500 6 00 700 800 9 00 1000 1100 1200 1300 1400 1500 frequency (mhz) s mall s ignal g ain (db) +85 o c +25 o c C40 o c figure 3. small signal gain vs frequency over temperature, p in = C20 dbm C20 C15 C10 C0.5 C40 C35 C30 C25 0 500 6 00 700 800 9 00 1000 1100 1200 1300 1400 1500 frequency (mhz) input return lo ss (db) +85 o c +25 o c C40 o c figure 5. input return loss vs frequency over temperature, p in = C20 dbm C40 C30 C20 C10 C50 C 6 0 0 500 6 00 700 800 9 00 1000 1100 1200 1300 1400 1500 frequency (mhz) rever s e i s olation (db) +85 o c +25 o c C40 o c figure 7. reverse isolation vs frequency over temperature, p in = C20 dbm C20 C15 C10 C5 C25 0 500 6 00 700 800 9 00 1000 1100 1200 1300 1400 1500 frequency (mhz) output return lo ss (db) +85 o c +25 o c C40 o c figure 4. output return loss vs frequency over temperature, p in = C20 dbm 0. 6 0.8 1.0 1.2 0.4 0.2 0 1.4 700 750 800 850 9 00 9 50 1000 frequency (mhz) noi s e figure (db) +85 o c +25 o c C40 o c figure 6. noise figure vs frequency over temperature, input rf connector and board trace de-embedded from measurement 30 31 32 33 34 35 3 6 700 750 800 850 9 00 9 50 1000 frequency (mhz) oip3 (dbm) +85 o c +25 o c C40 o c figure 8. oip3 vs frequency over temperature, p in = C18 dbm/tone, 5 mhz tone spacing
data sheet ? SKY65037-360LF low noise amplifier skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@sk yworksinc.com ? www.skyworksinc.com 201046b ? skyworks proprietary and confiden tial information ? produc ts and product information ar e subject to change witho ut notice ? may 19, 2009 5 C1.5 C1.0 C0.5 0 C3.5 C3.0 C2.5 C2.0 0.5 1.0 1.5 700 750 800 850 9 00 9 50 1000 frequency (mhz) ip1db (dbm) +85 o c +25 o c C40 o c figure 9. ip1db vs frequency over temperature evaluation board description the SKY65037-360LF evaluation board is used to test the performance of the SKY65037-360LF low noise amplifier. an assembly drawing for the evaluation board is shown in figure 10. the evaluation board schematic diagram is shown in figure 11. table 5 provides the bill of materials (bom) list for evaluation board components. 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 0.05 db at 900 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 with a 17.5 mil trace width and a 10 mil gap to ground. evaluation board test procedure 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 and verify performance detailed in table 4. package dimensions the pcb layout footprint for the SKY65037-360LF is shown in figure 12. package dimensions for the 8-pin qfn are shown in figure 13, and tape and reel dimensions are provided in figure 14. package and handling information since the device package is sensitive to moisture absorption, it is baked and vacuum packed before shipping. 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 SKY65037-360LF is rated to moisture sensitivity level 1 (msl1) at 260 c. 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. electrostatic discharge (esd) sensitivity the SKY65037-360LF is a static-sensitive electronic device. do not operate or store near strong electrostatic fields. take proper esd precautions.
data sheet ? SKY65037-360LF low noise amplifier skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@sk yworksinc.com ? www.skyworksinc.com 6 may 19, 2009 ? skyworks proprietary and confidential information ? products a nd product information are subject to change without notice ? 201046b c 1 l1 l2 c 2 c 4 r2 r3 c 8 l4 l3 r5 r 6 c 12 c 3 r1 c 5 c6 c 10 c9 c 11 l5 c 7 r4 s1414 c 1, c 2, l1, and l2 compri s e the input matching network c 11, c 12, and l5 compri s e the output matching network. r1, r5, and c 3 are the bia s component s for the 1 s t s tage ampli?er. r2, r 6 , and c 4 are the bia s component s for the 2nd s tage ampli?er. c 5, c6 , c9 , and c 10 are rf bypa ss capacitor s . l3 and l4 are rf choke inductor s . r3, r4, c 7, and c 8 are the feedback component s . figure 10. SKY65037-360LF evaluation board assembly diagram
data sheet ? SKY65037-360LF low noise amplifier skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@sk yworksinc.com ? www.skyworksinc.com 201046b ? skyworks proprietary and confiden tial information ? produc ts and product information ar e subject to change witho ut notice ? may 19, 2009 7 v dd r5 r1 rf in rf out 1 2 3 4 5 6 7 8 c 3 l1 l2 l5 c 1 c 2 l3 c 5 r 6 c9 l4 c 11 r2 c 4 s ky 6 5037 c6 c 10 r3 c 7 c 12 c 8 r4 s1407 figure 11. SKY65037-360LF evaluation board schematic
data sheet ? SKY65037-360LF low noise amplifier skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@sk yworksinc.com ? www.skyworksinc.com 8 may 19, 2009 ? skyworks proprietary and confidential information ? products a nd product information are subject to change without notice ? 201046b table 5. SKY65037-360LF (qfn package) ev aluation board bill of materials component value size ma nufacturer part series c1 3 pf 0402 murata gjm c2 0.5 pf 0402 murata gjm c3 4700 pf 0402 murata grm c4 1000 pf 0402 murata grm c5 15 pf 0402 murata grm c6 1000 pf 0402 murata grm c7 0.5 pf 0402 murata gjm c8 1.8 pf 0402 murata grm c9 1 pf 0402 murata grm c10 1000 pf 0402 murata grm c11 30 pf 0402 murata grm c12 3.9 pf 0402 murata grm l1 11 nh 0402 coilcraft hp l2 1.9 nh 0402 coilcraft hp l3 15 nh 0402 taiyo yuden hk l4 8.2 nh 0402 taiyo yuden hk l5 1.5 nh 0402 taiyo yuden hk r1 12 0402 panasonic C r2 9.1 0402 panasonic C r3 3 k 0402 panasonic C r4 51 0402 panasonic C r5 5.1 0402 panasonic C r6 7.5 0402 panasonic C
data sheet ? SKY65037-360LF low noise amplifier skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@sk yworksinc.com ? www.skyworksinc.com 201046b ? skyworks proprietary and confiden tial information ? produc ts and product information ar e subject to change witho ut notice ? may 19, 2009 9 expo s ed s older area s (typical) 0.25 0.50 pitch r0.20 pin 1 8x 0.25 2x 0.45 2x 0.85 8x 0.70 8x 0.45 all dimensions are in millimeters s1413 figure 12. SKY65037-360LF pcb layout footprint top view s ide view bottom view 0.15 c pin 1 indicator 2x 0.15 c 2x r0.12 typ r0.20 0.08 c 8x 3 5 c 0.10 2 2 0.5 0.25 a c 0.20 ref s eating plane detail b 2 place s detail c detail a 0.02 +0.03/C0.02 0.45 +0.05/C0.07 1.70 +0.10/C0.15 0.25 +0.05/C0.07 0. 9 0 +0.10/C0.15 0.85 +0.05/C0.07 expo s ed pad 0. 9 0 0.10 -b- -a- b 0.30 0.10 0.10 m c a b 0.05 m c detail c 8 place s detail b detail a c l 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 13. SKY65037-360LF 8-pin qfn package dimensions
data sheet ? SKY65037-360LF low noise amplifier skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@sk yworksinc.com ? www.skyworksinc.com 10 may 19, 2009 ? skyworks proprietary and confidential information ? products a nd product information are subject to chang e without notice ? 201046b 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. 2. 6 0 0.10 (ao) 2. 6 0 0.10 (bo) 8.00 +0.30/C0.10 4.00 0.10 4.00 0.10 3.50 0.05 2.00 0.05 1.75 0.10 0.30 0.01 (t) a b 1.20 0.10 (ko) a b b a pin #1 ? 1.50+ p0.10/C0.00 ? 1.00 min. s1480 r0.30 max r0.30 max figure 14. SKY65037-360LF tape and reel dimensions
data sheet ? SKY65037-360LF low noise amplifier skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@sk yworksinc.com ? www.skyworksinc.com 201046b ? skyworks proprietary and confiden tial information ? produc ts and product information ar e subject to change witho ut notice ? may 19, 2009 11 ordering information model name manufacturing part numb er evaluation kit part number SKY65037-360LF low noise amplifier SKY65037-360LF (pb-free package) SKY65037-360LF (700-1000 mhz) copyright ? 2009 skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skyw orks solutions, inc. (skyworks) products or services. these m aterials, including the information co ntained herein, are provided by skyworks as a service to its customers and may be used for info rmational purposes only by the cu stomer. skyworks assumes no res ponsibility for errors or omissions in these materials or the information contained herein. skyworks may change its documentat ion, products, services, specific ations or product descriptions at any time, without notice. sk yworks makes no commitment to update the materials or information and shall have no responsi bility whatsoever for conflicts, incompatibilities, or other diff iculties arising from any future changes. no license, whether express, implied, by es toppel or otherwise, is granted to any in tellectual property rights by this document . skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, re production or use of skyworks products, information or mate rials, except as may be provided in skyworks terms and conditions of sale. the materials, products and information are pr ovided as is without warranty of any ki nd, whether express, implied, statutory, or otherwise, including fitness for a particular purpose or use, merch antability, performance, quality or non-infringe ment of any intellectual property right; all su ch warranties are hereby expressly disclaimed. skyworks does not warrant the accura cy or completeness of the information, text, graphics or other items contained within these ma terials. skyworks shall not be liable for any damages, including but not limited to any special, indirect, incidental, statutory, or consequentia l damages, including without limitation, lost revenues or lost profits that may result from the use of the materials or information, wheth er or not the recipient of mat erials has been advised of the possibility of such damage. skyworks products are no t intended for use in medical, lifesaving or life-su staining applications, or other equipment in which the failure of the skyworks products could lead to personal injury, death, physical or environmental damage. skyw orks customers using or selli ng 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 us ing skyworks products , which may deviate from published specifi cations as a result of design de fects, errors, or operation of products outside of published pa rameters or design specifications. customers sh ould include design and operating safeguards to minimize these and other risks. skyworks assumes no liability for applications assistance, customer product de sign, or damage to any equipment resulting from the use of skyw orks products outsid e of stated published specifications or parameters. skyworks, the skyworks symbol, a nd breakthrough simplicity are trademarks or registered tradem arks of skyworks solutions, inc ., in the united states and othe r countries. third-party brands and names are for identification purposes only, and are the proper ty of their respective owners. additional information, includ ing relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.

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