skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201069c ? skyworks proprietary and confidential information ? products and product information are subject to change witho ut notice ? september 15, 2009 1 data sheet SKY65051-377LF: 0.45-6.0 ghz low noise transistor applications x wireless infrastructure: wlan, wimax, broadband, cellular base stations x test instrumentation x lna for gps receivers x satellite receivers features x externally matched for wideband operation x noise figure = 0.45 db @ 2.4 ghz of device only x noise figure = 0.65 db @ 2.4 ghz including matching network loss x gain = 15.5 db @ 2.4 ghz x oip3 = +24 dbm @ 2.4 ghz x p1db = +12 dbm @ 2.4 ghz x adjustable supply current from 5 to 55 ma x small, qfn (4-pin, 2 x 2 mm) pb-free package (msl1, 260 q c per jedec j-std-020) figure 1. SKY65051-377LF block diagram description the SKY65051-377LF is a high performance, n-channel low- noise transistor. the device is fabricated from skyworks advanced depletion mode phemt process and is provided in a 2 x 2 mm, 4-pin quad flat no-lead (qfn) package. the transistors low noise figure (nf), high gain, and excellent 3 rd order intercept point (ip3) allow the device 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. 12 43 drain source source gate figure 2. SKY65051-377LF pinout C 4-pin qfn (bottom view)
data sheet ? SKY65051-377LF low noise transistor skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 2 september 15, 2009 ? skyworks proprietary and confidential information ? products and product information are subject to change without notice ? 201069c table 1. SKY65051-377LF signal descriptions pin # name description pin # name description 1 drain rf output. requir es external matching network for optimum performance. supply voltage required through external rf choke. 3 gate rf input. requires external matching network for optimum performance. 2 source source lead. provides dc self-biasing point and ac ground. 4 source source lead. provides dc self-biasing point and ac ground. table 2. self-biasing resistors resistor value ( 130 5 47 10 27 15 20 20 15 25 10 30 functional description the SKY65051-377LF is a depletion mode phemt designed for low noise, high frequency applications. the SKY65051-377LF has a typical nf of 0.65 db tested at the 2.4 ghz wireless lan frequency band. a gain of 15.5 db typical is achieved using the same circuit. if the frequency of operation is lowered to the 1 ghz range, nf performance of the device can approach 0.5 db including input matching network losses. de-embedded scattering and noise parameters are provided in addition to typical circuit topologies for commonly used frequency bands. with an appropriate circuit, the SKY65051-377LF can be used for many applications from 450 mhz up to 6 ghz. the 2 x 2 mm qfn package makes the SKY65051-377LF an ideal low noise and low cost solution. biasing to properly bias a depletion mode phemt, both the gate and drain of the device must be properly biased. at v gs = 0 v and v ds 2 v, the device is in a saturated state and draws the maximum amount of current, i dss . the device typically achieves the best noise performance at v ds = 3 v and i dss = 15 ma. to control i ds , v gs must be biased with a negative voltage supply. 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. table 2 provides the resistor values used to properly bias the SKY65051-377LF. rf matching networks the SKY65051-377LF evaluation board assembly diagram is shown in figure 12 and a circuit schematic is provided in figure 13. the schematic shows the recommended rf matching network used for the 2.4 ghz wireless lan frequency band. the network was designed using de-embedded s- and n-parameters. the circuit was primarily tuned for gain, nf, and input and output return loss, while maintaining proper stability. optimal noise performance is attained when the impedance presented to the input of the amplifier is equal to its minimum nf impedance point. components c1, c2, c3, l1, and l2 shown in figures 12 and 13 provide the necessary impedance match for nf and input return loss. circuit board and input matching structure losses on the input of the amplifier directly add to the overall nf of the amplifier. it is critical to minimize rf trace lengths and to use high-q components to achieve optimal nf performance. components r2 and c14 provide self biasing for the device and rf grounding for one of the two source leads. components c5 and l3 are placed on the opposing source lead and are used to tune the transistors source inductance.
data sheet ? SKY65051-377LF low noise transistor skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201069c ? skyworks proprietary and confidential information ? products and product information are subject to change witho ut notice ? september 15, 2009 3 the effect of source inductance varies with frequency. too little source inductance increases gain and high frequency stability, but at the cost of decreased in-band stability. too much source inductance decreases high frequency stability and gain, but increases in-band stability. it is very important to find the optimum tuning of source inductance that balances all of these variables. the output matching topology is typical for an rf transistor. component l3 is the rf choke that prevents rf signals from reaching the dc supply. component c4 is the dc blocking capacitor. components c10 and c11 improve output return loss and 3 rd order output intercept point (oip3) performance. electrical and mechanical specifications the absolute maximum ratings of the SKY65051-377LF are provided in table 3. the recommended operating conditions are specified in table 4 and electrical specifications are provided in table 5. performance characteristics for the SKY65051-377LF are illustrated in figures 3 through 11. table 3. SKY65051-377LF absolute maximum ratings parameter symbol minimum typical maximum units input power p in +10 dbm output power p out +20 dbm drain source voltage v ds 6.0 v gate source voltage v gs C5.0 v gate drain voltage v gd C5.0 v drain current i ds 55 ma gate current i gs 100 a power dissipation p dis 240 mw channel temperature t chan 150 q c storage temperature t stg C65 +125 q c operating temperature t op C40 +85 q c note: exposure to maximum rating conditions for extended periods m ay 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. caution : although this device is designed to be as robust as possible, electrostatic discharge (esd) can damage this device. this devi ce 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 4. SKY65051-377LF recommended operating conditions parameter symbol minimum typical maximum units supply voltage v dd 2 3 5 v supply current i dd 5 20 50 ma
data sheet ? SKY65051-377LF low noise transistor skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 4 september 15, 2009 ? skyworks proprietary and confidential information ? products and product information are subject to change without notice ? 201069c table 5. SKY65051-377LF electrical specifications (note 1) (t op = +25 q c, characteristic impedance [z o ] = 50 parameter symbol test condition min typical max units saturated drain current i dss v ds = 2 v, v gs = 0 v 40 55 70 ma pinchoff voltage v p v ds = 2 v, i ds = 2.5% of i dss C0.95 C0.80 C0.65 v transconductance g m v ds = 2 v, g m = i ds / v gs , measured at i ds = 20 % of i dss 40 80 120 ms gate leakage current i gss v gd = v gs = C3 v 1 200 a noise figure nf1 (note 2) nf2 (note 3) @ 2.4 ghz 0.40 0.65 0.85 db db gain |s 21 | @ 2.4 ghz 13.5 15.5 17.5 db input return loss |s11| @ 2.4 ghz C25 db output return loss |s22| @ 2.4 ghz C8 db reverse isolation |s12| @ 2.4 ghz C23.5 db 3 rd order output intercept point oip3 p out = C10 dbm/tone, f = 1 mhz, @ 2.4 ghz +24.0 dbm 3 rd order input inter cept point iip3 p out = C10 dbm/tone, f = 1 mhz, @ 2.4 ghz +8.5 dbm 1 db output compression point op1db @ 2.4 ghz +12.0 dbm 1 db input compression point ip1db @ 2.4 ghz C2.5 dbm stability unconditionally stable, dc C 18 ghz >1 k note 1 : performance is guaranteed only under the conditions listed in this table and is not guaranteed over the full operating or sto rage 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 devi ce. note 2 : nf of device only. input rf connector, board, and input matching network loss de-embedded from measurement. note 3 : nf of device and matching network. input rf connector and board loss de-embedded from measurement. typical performance characteristics (t op = +25 q c, characteristic impedance [z o ] = 50 0 10 20 30 40 50 60 012345 i ds (ma) 0 v C0.1 v C0.4 v C0.2 v C0.3 v C0.5 v C0.6 v C0.7 v v ds (v) figure 3. typical iv curves 10 11 12 13 14 15 16 17 18 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 frequency (mhz) small signal gain (db) figure 4. small signal gain vs frequency, p in = C20 dbm
data sheet ? SKY65051-377LF low noise transistor skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201069c ? skyworks proprietary and confidential information ? products and product information are subject to change witho ut notice ? september 15, 2009 5 C50 C45 C40 C35 C30 C25 C20 C15 C10 C5 0 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 frequency (mhz) input return loss (db) figure 5. input return loss vs frequency, p in = C20 dbm C10 C9 C8 C7 C6 C5 C4 C3 C2 C1 0 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 frequency (mhz) output return loss (db) figure 7. output return loss vs frequency, p in = C20 dbm 10.0 10.5 11.0 11.5 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 C20 C18 C16 C14 C12 C10 C8 C6 C4 C2 0 +2 input power (dbm) gain (db) figure 9. gain vs input power, f = 2.4 ghz C 40 C 35 C 30 C 25 C 20 C 15 C 10 C 5 0 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 frequency (mhz) reverse isolation (db) figure 6. reverse isolation vs frequency, p in = C20 dbm 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 2300 2350 2400 2450 2500 frequency (mhz) noise figure (db) figure 8. nf vs frequency, input rf connector and board loss de-embedded from measurement 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0123456 frequency (ghz) minimum nf (db) 0 2 4 6 8 10 12 14 16 18 20 associated gain (db) figure 10. minimum nf and associated gain vs frequency, i dd = 15 ma
data sheet ? SKY65051-377LF low noise transistor skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 6 september 15, 2009 ? skyworks proprietary and confidential information ? products and product information are subject to change without notice ? 201069c 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0102030405060 drain current (ma) minimum noise figure (db) 0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0 associated gain (db) figure 11. minimum nf and associated gain vs drain current, f = 2.4 ghz evaluation board description the SKY65051-377LF evaluation board is used to test the performance of the SKY65051-377LF low noise transistor. an assembly drawing for the evaluation board is shown in figure 12. the evaluation board schematic diagram is shown in figure 13. table 6 provides the bill of materials (bom) list for evaluation board components. the board is populated for 2.4 ghz operation and contains a separate probe footprint for general device testing or source and load pull characterization. the board is provisioned with two rf connectors and a 3-pin dc launch. the rf connector and board loss up to component c1 is approximately 0.15 db at 2.4 ghz. board material is 10 mil thick vt47 fr4 with 1 oz. copper cladding. rf input and output traces are 50 . caution: do not ground the exposed pad. 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 +3 v supply with a current limit of 60 ma. verify that the board draws approximately 20 ma. step 4: apply rf signal or noise source and verify performance detailed in table 5. package dimensions package dimensions for the 4-pin qfn are shown in figure 14, and tape and reel dimensions are provided in figure 15. 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 SKY65051-377LF is rated to moisture sensitivity level 1 (msl1) at 260 q 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.
data sheet ? SKY65051-377LF low noise transistor skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201069c ? skyworks proprietary and confidential information ? products and product information are subject to change witho ut notice ? september 15, 2009 7 s1412 r2 c15 c13 c9 l5 c11 c12 c10 out vdd c8 l4 c7 c6 r1 c14 c3 c2 c1 l1 c4 l3 c5 l2 caution: do not ground the exposed pad. figure 12. SKY65051-377LF evaluation board assembly diagram c1 c2 c4 c5 l1 l2 l5 l4 l3 rf output vdd rf input r2 r1 s1406 c9 c11 c10 c12 c3 c8 c7 c14 c15 c6 figure 13. SKY65051-377LF evaluation board schematic
data sheet ? SKY65051-377LF low noise transistor skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 8 september 15, 2009 ? skyworks proprietary and confidential information ? products and product information are subject to change without notice ? 201069c table 6. SKY65051-377LF (qfn package) evaluation board bill of materials component value size manufacturer part number c1 20 pf smt 0402 murata gjm series c2 8.2 nh smt 0402 coilcraft cs series c3 0.2 pf smt 0402 murata gjm series c4, c6, c7, c12, c13, c15 dnp c5 1000 pf smt 0402 murata grm series c8 22 pf smt 0402 c9 1.8 pf smt 0402 murata grm series c10 0.5 pf smt 0402 murata grm series c11 3.3 nh smt 0402 tdk mlg series c14 1000 pf smt 0402 murata grm series c15 20 smt 0402 panasonic l1 1.5 pf smt 0402 murata gjm series l2 3.3 nh smt 0402 coilcraft cs series l3 1.6 nh smt 0402 tdk mlg series l4 3.3 nh smt 0402 tdk mlg series l5 0 smt 0402 panasonic r1 0 smt 0402 panasonic r2 dnp 4x 0.600 2x 0.300 2x 0.600 0.600 detail b detail a (3x) 0.650 0.55 0.55 0.40 0.30 1.300 pin 1 package outline 1.250 see detail a for solderable area see detail b for solderable area s1416 caution: do not ground the exposed pad. figure 14. SKY65051-377LF pcb layout footprint
data sheet ? SKY65051-377LF low noise transistor skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201069c ? skyworks proprietary and confidential information ? products and product information are subject to change witho ut notice ? september 15, 2009 9 s1411 2.00 0.02+0.03/C0.02 0.6+0.1/C0.15 1.2+0.1/C0.15 0.55+0.05/C0.04 0.4 0.1 0.4 0.1 0.4 0.05 0.3 0.05 r 0.15 (0.600) (0.300) a b c 2.00 2x pin 1 indicator 1.25 1.30 2x 0.65 detail b 4x 0.20 min detail a detail a scale: 100x detail b scale: 100x 3 places exposed pad 0.10 c 2x 0.10 c 0.10 c 0.08 3 5 c 4x 0.10 c a b m figure 15. SKY65051-377LF 4-pin qfn package dimensions notes: 1. carrier tape: black conductive polystyrene. 2. cover tape material: transparent conductive hsa. 3. cover tape size: 5.40 mm width. 4. ten sprocket hole pitch cumulative tolerance = 0.20 mm. 5. all measurements are in millimeters. 2.30 (ao) 2.30 (bo) 8.00 +0.30/C0.10 4.00 (see note 4) 4.00 0.10 3.50 0.05 2.00 0.05 1.75 0.10 0.30 0.05 (t) a b 1.00 (ko) a b b a pin #1 ? 1.50+ 0.10/C0.00 ? 1.00 min. s1601 r0.30 max figure 16. SKY65051-377LF tape and reel dimensions
data sheet ? SKY65051-377LF low noise transistor skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 10 september 15, 2009 ? skyworks proprietary and confidential information ? products and product information are subject to change without notice ? 201069c ordering information model name manufacturing part number evaluation kit part number SKY65051-377LF low noise transistor SKY65051-377LF (pb-free package) SKY65051-377LF (2400 mhz) 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 m aterials, 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 res ponsibility 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 diff iculties 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 mate rials, 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, mercha ntability, performance, quality or non-infringement of any intellectual property right; all su ch 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 consequentia l 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 mat erials 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 specifi cations 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 outsid e 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, includ ing relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.
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