4-124 up to 6 ghz low noise silicon bipolar transistor technical data features ? low noise figure: 1.4 db typical at 1.0 ghz 1.7 db typical at 2.0 ghz ? high associated gain: 18.5 db typical at 1.0 ghz 13.5 db typical at 2.0 ghz ? high gain-bandwidth product: 8.0 ghz typical f t AT-41485 85 plastic package description hewlett-packards AT-41485 is a general purpose npn bipolar transistor that offers excellent high frequency performance. the AT-41485 is housed in a low cost .085" diameter plastic package. the 4 micron emitter-to-emitter pitch enables this transistor to be used in many different functions. the 14 emitter finger interdigi- tated geometry yields an interme- diate sized transistor with imped- ances that are easy to match for low noise and moderate power applications. applications include use in wireless systems as an lna, gain stage, buffer, oscillator, and mixer. an optimum noise match near 50 w at 900 mhz, makes this device easy to use as a low noise amplifier. the AT-41485 bipolar transistor is fabricated using hewlett-packards 10 ghz f t self-aligned-transistor (sat) process. the die is nitride passivated for surface protection. excellent device uniformity, performance and reliability are produced by the use of ion- implantation, self-alignment techniques, and gold metalization in the fabrication of this device. 5965-8926e
4-125 AT-41485 absolute maximum ratings absolute symbol parameter units maximum[ 1] v ebo emitter-base voltage v 1.5 v cbo collector-base voltage v 20 v ceo collector-emitter voltage v 12 i c collector current ma 60 p t power dissipation [2,3] mw 500 t j junction temperature c 150 t stg storage temperature c -65 to 150 thermal resistance [2,4] : q jc = 155 c/w notes: 1. permanent damage may occur if any of these limits are exceeded. 2. t case = 25 c. 3. derate at 6.5 mw/ c for t c > 73 c. 4. see measurements section thermal resistance for more information. electrical specifications, t a = 25 c symbol parameters and test conditions units min. typ. max. |s 21e | 2 insertion power gain; v ce = 8 v, i c = 25 ma f = 1.0 ghz db 17.5 f = 2.0 ghz 11.5 p 1 db power output @ 1 db gain compression f = 2.0 ghz dbm 18.5 v ce = 8 v, i c = 25 ma g 1 db 1 db compressed gain; v ce = 8 v, i c = 25 ma f = 2.0 ghz db 14.0 nf o optimum noise figure: v ce = 8 v, i c = 10 ma f = 1.0 ghz db 1.4 1.8 f = 2.0 ghz 1.7 f = 4.0 ghz 3.0 g a gain @ nf o ; v ce = 8 v, i c = 10 ma f = 1.0 ghz db 17.5 18.5 f = 2.0 ghz 13.5 f = 4.0 ghz 9.5 f t gain bandwidth product: v ce = 8 v, i c = 25 ma ghz 8.0 h fe forward current transfer ratio; v ce = 8 v, i c = 10 ma 30 150 270 i cbo collector cutoff current; v cb = 8 v m a 0.2 i ebo emitter cutoff current; v eb = 1 v m a 1.0 c cb collector base capacitance [1] : v cb = 8 v, f = 1 mhz pf 0.25 notes: 1. for this test, the emitter is grounded.
4-126 AT-41485 typical performance, t a = 25 c frequency (ghz) figure 1. noise figure and associated gain vs. frequency. v ce = 8 v, i c = 10ma. gain (db) i c (ma) figure 3. optimum noise figure and associated gain vs. collector current and collector voltage. f = 2.0 ghz. gain (db) 0 1020 3040 figure 4. optimum noise figure and associated gain vs. collector current and frequency. v ce = 8 v. 10 v 4 v frequency (ghz) figure 5. insertion power gain, maximum available gain and maximum stable gain vs. frequency. v ce = 8 v, i c = 25 ma. gain (db) 0.1 0.5 0.3 1.0 3.0 6.0 i c (ma) gain (db) i c (ma) figure 2. output power and 1 db compressed gain vs. collector current and frequency. v ce = 8 v. 24 20 16 12 8 4 g 1 db (db) p 1 db (dbm) 0 1020 3040 p 1db g 1db 24 21 18 15 12 9 6 3 0 8 6 4 2 0 nf (db) 4 3 2 1 nf o (db) 0.5 2.0 1.0 3.0 4.0 5.0 16 15 14 13 12 g a g a nf o nf o g a nf o nf 50 6 v 0 1020 3040 2.0 ghz 2.0 ghz 4.0 ghz 4.0 ghz 6 4 2 0 nf o (db) 16 14 12 10 8 2.0 ghz 2.0 ghz 4.0 ghz 4.0 ghz i c (ma) figure 6. insertion power gain vs. collector current and frequency. v ce = 8 v. 20 16 12 8 4 0 |s 21e | 2 gain (db) 0 1020 3040 1.0 ghz 2.0 ghz 4.0 ghz 40 35 30 25 20 15 10 5 0 msg mag |s 21e | 2 10 v 4 v 6 v
4-127 AT-41485 typical scattering parameters, common emitter, z o = 50 w , t a =25 c, v ce =8 v, i c = 10 ma freq. s 11 s 21 s 12 s 22 ghz mag. ang. db mag. ang. db mag. ang. mag. ang. 0.1 .74 -40 28.2 25.80 156 -35.6 .017 81 .93 -14 0.5 .61 -126 21.9 12.46 108 -29.2 .035 44 .57 -31 1.0 .57 -161 16.6 6.80 87 -27.9 .040 38 .46 -33 1.5 .57 -180 13.4 4.67 75 -25.7 .052 47 .43 -34 2.0 .58 166 11.0 3.55 64 -24.5 .060 54 .41 -38 2.5 .59 160 9.3 2.92 59 -23.3 .068 58 .40 -39 3.0 .61 150 7.7 2.42 50 -21.9 .080 63 .39 -46 3.5 .62 142 6.4 2.09 41 -20.8 .091 61 .41 -54 4.0 .62 134 5.3 1.84 32 -19.5 .106 59 .42 -62 4.5 .62 125 4.3 1.65 24 -18.4 .120 57 .43 -67 5.0 .63 115 3.5 1.50 15 -17.2 .138 54 .44 -73 5.5 .65 103 2.7 1.37 6 -16.1 .157 49 .43 -78 6.0 .69 92 1.8 1.24 -4 -15.3 .172 46 .40 -86 AT-41485 typical scattering parameters, common emitter, z o = 50 w , t a =25 c, v ce =8 v, i c = 25 ma freq. s 11 s 21 s 12 s 22 ghz mag. ang. db mag. ang. db mag. ang. mag. ang. 0.1 .55 -68 32.0 40.01 146 -40.9 .009 57 .85 -19 0.5 .58 -153 23.1 14.20 99 -32.7 .023 52 .47 -29 1.0 .58 -177 17.4 7.39 82 -29.8 .032 63 .41 -28 1.5 .58 169 14.0 5.01 71 -27.3 .043 60 .39 -30 2.0 .60 158 11.6 3.78 61 -24.6 .059 64 .38 -36 2.5 .60 153 9.8 3.09 58 -23.7 .065 71 .36 -39 3.0 .63 147 8.1 2.55 48 -21.7 .082 68 .35 -47 3.5 .64 140 6.9 2.21 39 -20.7 .092 67 .37 -56 4.0 .64 133 5.8 1.94 31 -19.4 .107 65 .39 -64 4.5 .64 125 4.8 1.74 23 -18.1 .125 63 .40 -71 5.0 .64 115 4.0 1.58 14 -17.1 .140 56 .41 -78 5.5 .66 105 3.2 1.45 5 -15.9 .160 50 .40 -82 6.0 .70 94 2.4 1.32 -5 -15.1 .175 47 .37 -91 a model for this device is available in the device models section. AT-41485 noise parameters: v ce = 8 v, i c = 10 ma freq. nf o g opt ghz db mag ang r n /50 0.1 1.3 .12 5 0.17 0.5 1.3 .10 25 0.17 1.0 1.4 .06 50 0.16 2.0 1.7 .25 172 0.16 4.0 3.0 .48 -131 0.24
4-128 85 plastic package dimensions 1 3 4 2 5 typ. 45 emitter emitter collector base .085 2.15 .286 .030 7.36 .76 notes: (unless otherwise specified) 1. dimensions are in 2. tolerances in .xxx = 0.005 mm .xx = 0.13 mm .020 .51 .07 0.43 .060 .010 1.52 .25 .006 .002 .15 .05 0.143 0.015 3.63 0.38 414
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