october 2010 doc id 18079 rev 1 1/8 8 STEVAL-TDR022V1 rf power amplifier using the pd85025-e for uhf ofdm and 2-way mobile radios features excellent thermal stability frequency: 340 - 520 mhz supply voltage: 15 v output power: 10 wpep gain: 16.5 db min. imd3 < -27 dbc at 10 wpep load mismatch: 20:1 beo free amplifier description the STEVAL-TDR022V1 is an demonstration board using pd85025-e ldmos transistor and designed for uhf ofdm and 2-way mobile radios. table 1. device summary order code STEVAL-TDR022V1 mechanical specification: l = 60 mm, w = 30 mm www.st.com
contents STEVAL-TDR022V1 2/8 doc id 18079 rev 1 contents 1 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 circuit layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
STEVAL-TDR022V1 electrical characteristics doc id 18079 rev 1 3/8 1 electrical characteristics t a = + 25 c, v dd = 15 v, i dq = 220 ma table 2. electrical specification symbol test conditions min. typ. max. unit freq frequency range 340 520 mhz p out 2 tones test - df = 600 khz 10 wpep gain @ p out = 10 wpep 16.5 db i d drain current @ 10w pep 1.25 a h2 2 nd harmonic @ p out = 10 wpep -37 / -60 db h3 3 rd harmonic @ p out = 10 wpep -60 / -68 db vswr load mismatch all phases @ p out = 10 w 20:1
test circuit STEVAL-TDR022V1 4/8 doc id 18079 rev 1 2 test circuit figure 1. test circuit schematic vcc_2p c12 c17 l3 l1 l7 l6 m sub fr 4 _6 0 h= 1 . 52 m m msub c11 b2 l5 l4 l2 c6 c13 p1 c16 c7 c8 c1 c15 r3 p2 c10 c3 c4 c5 c9 c14 c2 b1 r1 r4 r6 r5 ldmos m odel=pd85025-e r2 d1
STEVAL-TDR022V1 circuit layout doc id 18079 rev 1 5/8 3 circuit layout figure 2. circuit layout table 3. component part list component id description value c ase size manufacturer part code b1 ferrite bead panasonic exceldrc35c b2 ferrite bead panasonic exceldrc35c c1, c2 capacitor 120 pf 1206 murata grm42-6 cog 121j 50_ c3 capacitor 1 nf 1206 murata grm42-6 cog 102j 50 c4 capacitor 100 nf 1206 murata grm42-6_x7r 104k 50_ c5 capacitor 10 f smt p anasonic eevhb1v100p c6, c12 capacitor 180 pf 100b atc atc 100b 181jw c7 capacitor 22 pf 100b atc atc 100b 220jw c8 capacitor 47 pf 100b atc atc 100b 470jw c9 capacitor 36 pf 100b atc atc 100b 360jw c10 capacitor 22 pf 100b atc atc 100b 220jw c11 capacitor 47 pf 100b atc atc 100b 470 jw c16 capacitor 6.8 pf 100b atc atc 100b 6r8bw c13 capacitor 51 pf 100b atc atc 100b 510jw c14 capacitor 10 f murata grm32nf51e106za01b c15 capacitor 330 nf 1206 murata grm42-6_x7r 334k 50_ c17 capacitor 9.1 pf 100b atc atc 100b 9r1jw d1 zener diode 5.1 v sod110 philips bzx284c5v1 l1 inductor 22 nh coilcraft b07tjlb
circuit layout STEVAL-TDR022V1 6/8 doc id 18079 rev 1 component id description value c ase size manufacturer part code l2, l7 inductor 12.5 nh coilcraft a04tjlb l3, l5 inductor 2,5 nh coilcraft a01tklb l4, l6 inductor 5 nh coilcraft a02tjlb r1 resistor 1 k 1206 tyco electronics 01623440-1 r2 potentiometer 10 k bourns electronics 3214w-1-103e r3 resistor 16 1206 bourns electronics r7 resistor 0 1206 bourns electronics r4, r5, r6 resistor 2.2 603 vishay d11/crcw0603 vcc_2p connector dc 2 poli 2.54mm phoenix contact 1725656 p1_p2 rf connector sma_female flange solder 1.54 mm q ldmos pd85025-e stmicroelectronics pd85025-e board fr-4 thk=0.060" 2oz cu both sides table 3. component part list (continued)
STEVAL-TDR022V1 revision history doc id 18079 rev 1 7/8 4 revision history table 4. document revision history date revision changes 11-oct-2010 1 initial release
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