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october 2010 doc id 18100 rev 1 1/11 11 STEVAL-TDR021V1 demonstration board using the pd84008l-e for 900 mhz 2-way radio features excellent thermal stability frequency: 740 - 950 mhz supply voltage: 7.2 v output power: 5 w power gain: 11 1.0 db efficiency: 48 % - 54% load mismatch: infinite beo free amplifier description the STEVAL-TDR021V1 is a demonstration board using the pd84008l-e ldmos transistor. it is designed for 2-way uhf portable radio applications. table 1. device summary part number mechanical specification STEVAL-TDR021V1 l = 60 mm, w = 30 mm www.st.com
contents STEVAL-TDR021V1 2/11 doc id 18100 rev 1 contents 1 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 circuit layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
STEVAL-TDR021V1 electrical characteristics doc id 18100 rev 1 3/11 1 electrical characteristics t a = + 25 c, v dd = 7.5 v, i dq = 50 ma table 2. electrical specification symbol test conditions min. typ. max. unit freq frequency range 740 950 mhz p out 5w gain @ p in = 26 db 11 1.0 db nd @ p in = 26 db 49 - 54 % h2 2 nd harmonic @ p in = 26 db -46 / -60 dbc h3 3 rd harmonic @ p in = 26 db -54 / -60 dbc vswr load mismatch all phases @ p out = 5 w infinite
impedance STEVAL-TDR021V1 4/11 doc id 18100 rev 1 2 impedance figure 1. impedance graphic table 3. impedance data f (mhz) z gs z dl 740 1.87 - j5.74 3.04 - j6.19 750 1.84 - j5.65 3.10 - j6.13 760 1.83 - j5.55 3.17 - j6.09 770 1.81 - j5.43 3.26 - j6.04 780 1.79 - j5.30 3.35 - j5.60 790 1.74 - j5.19 3.43 - j5.98 800 1.70 - j5.13 3.51 - j6.02 810 1.67 - j5.05 3.61 - j6.09 820 1.68 - j4.97 3.70 - j6.20 830 1.69 - j4.89 3.82 - j6.32 840 1.69 - j4.80 3.91 - j6.48 850 1.68 - j4.72 3.94 - j6.70 860 1.67 - j4.68 3.90 - j6.96 870 1.66 - j4.61 3.82 - j7.22 880 1.66 - j4.54 3.67 - j7.48 890 1.66 - j4.48 3.47 - j7.65 900 1.61 - j4.37 3.17 - j7.74 910 1.54 - j4.26 2.85 - j7.79 920 1.48 - j4.18 2.48 - j7.81 930 1.43 - j4.12 2.12 - j7.77 940 1.36 - j4.04 1.77 - j7.67 950 1.33 - j3.98 1.49 - j7.51 z dl z in g d s z gs
STEVAL-TDR021V1 typical performance doc id 18100 rev 1 5/11 3 typical performance figure 2. output power vs. frequency vdd = 7.2 v - idq = 200 ma figure 3. gain vs. frequency vdd = 7.2 v - idq = 200 ma figure 4. input return loss vs. frequency vdd = 7.2 v - idq = 200 ma figure 5. efficiency vs. frequency vdd = 7.2 v - idq = 200 ma 1 2 3 4 5 6 700 720 740 760 780 800 820 840 860 880 900 920 940 960 980 1000 freq (mhz) pout (w) pin=25 dbm pin=26 dbm 8 9 10 11 12 13 14 700 720 740 760 780 800 820 840 860 880 900 920 940 960 980 1000 freq (mhz) gain (db) pin=25 dbm pin=26 dbm -8 -7 -6 -5 -4 -3 -2 -1 0 700 720 740 760 780 800 820 840 860 880 900 920 940 960 980 1000 freq (mhz) irl (db) pin=25 dbm pin=26 dbm 30 40 50 60 700 720 740 760 780 800 820 840 860 880 900 920 940 960 980 1000 freq (mhz) eff (%) pin=25 dbm pin=26 dbm
typical performance STEVAL-TDR021V1 6/11 doc id 18100 rev 1 figure 6. gain vs. output vdd = 7.2 v - idq = 200 ma figure 7. harmonics vs. frequency pin = 26 dbm vdd = 7.2 v - idq = 200 ma 8 9 10 11 12 13 14 15 16 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 pout (w) gain (db) 740 mhz 850 mhz 950 mhz -70 -65 -60 -55 -50 -45 -40 720 740 760 780 800 820 840 860 880 900 920 940 960 980 freq (mhz) harmonics (dbc) h2 h3
STEVAL-TDR021V1 test circuit doc id 18100 rev 1 7/11 4 test circuit figure 8. test circuit schematic + fr4 h=20 mil msub c12 c11 c10 l1 b2 c2 rfout tl6 vcc 2 - 1 + c3 c4 c5 c13 tl5 tl4 c7 rfin c6 c8 tl2 tl1 tl3 r3 r1 r2 c9 b1 pd 84008l ldmos c1 table 4. component part list component id description value case size manufacturer part code b1 ferrite bead panasonic exceldrc35c b2 ferrite bead panasonic exceldrc35c c1, c2 capacitor 150 pf 0603 murata grm39- c0g151j50d500 c3 capacitor 1 nf 0603 murata grm39- cog102j50d500 c4 capacitor 10 nf 0603 murata grm39- x7r103k50c560_ c5 capacitor 10 f smt panasonic eevhb1v100p c6, c13 capacitor 39 pf 0603 murata grm39- c0g390j50d500 c7, c8 capacitor 3,9 pf 0603 murata grm39- c0g3r9c50z500 c9, c10 capacitor 18 pf 0603 murata grq706- c0g180j50k500 c11 capacitor 8.2 pf 0603 murata grm39- c0g8r2d50z500 c12 capacitor 2 pf 0603 murata grq706- c0g020c100k500 l1 inductor 12.55 nh coilcraft 1606-10 r1 resistor 510 0603 tyco electronics r2 potentiometer 1 k bourns electronics 3224w-1-102
test circuit STEVAL-TDR021V1 8/11 doc id 18100 rev 1 component id description value case size manufacturer part code r3 resistor 100 0603 tyco electronics 01623440-1 tl1 transmission line w=0.92 mm l=12,5 mm tl2 transmission line w=0.92 mm l=3,5 mm tl3 transmission line w=0.92 mm l=2,6 mm tl4 transmission line w=0.92 mm l=1,8 mm tl5 transmission line w=0.92 mm l=5,3 mm tl6 transmission line w=0.92 mm l=10.0 mm rf in, rf out sma-conn 50 60 mils johnson 142-0701-801 pd84008l-e ldmos stmicroelectronics pd84008l-e board fr-4 thk=0.020" 2oz cu both sides table 4. component part list (continued)
STEVAL-TDR021V1 circuit layout doc id 18100 rev 1 9/11 5 circuit layout figure 9. circuit layout
revision history STEVAL-TDR021V1 10/11 doc id 18100 rev 1 6 revision history table 5. document revision history date revision changes 14-oct-2010 1 initial release
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