STEVAL-TDR019V1 Demonstration board using the PD85004 for 900 MHz 2-way radio Features ■ Excellent thermal stability ■ Frequency: 860 - 960 MHz ■ Supply voltage: 13.6 V ■ Output power: 4 W ■ Power gain: 17.4 ± 0.3 dB ■ Efficiency: 56 % - 65 % ■ Load mismatch: 20:1 ■ BeO-free amplifier Description The STEVAL-TDR019V1 is a demonstration board using the PD85004 LDMOS transistor. It is designed for 2-way radio applications. Table 1. October 2010 Device summary Part number Mechanical specification STEVAL-TDR019V1 L = 60 mm, W = 30 mm Doc ID 18092 Rev 1 1/9 www.st.com 9 Contents STEVAL-TDR019V1 Contents 1 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Circuit layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2/9 Doc ID 18092 Rev 1 STEVAL-TDR019V1 1 Electrical characteristics Electrical characteristics TA = +25 oC, VDD = 13.6 V, Idq = 50 mA Table 2. Symbol Electrical specifications Test conditions Frequency Frequency range Min Typ 860 POUT Max Unit 960 MHz 4 W Gain @ PIN = 19 dBm 17.4 ± 0.3 dB ND @ PIN = 19 dBm 56 - 65 % H2 2nd harmonic @ POUT = 4 W -30 / -38 dBc H3 3rd harmonic @ POUT = 4 W -50 / -62 dBc VSWR Load mismatch all phases @ POUT = 4 W Doc ID 18092 Rev 1 20:1 3/9 Impedance 2 STEVAL-TDR019V1 Impedance Figure 1. Impedance illustration D ZDL Z ZGS IN G S Table 3. 4/9 Impedance data F (MHz) ZGS ZDL 860 2,460 + j6,634 8,383 + j2,828 870 2,489 + j6,787 8,222 + j3,179 880 2,588 + j6,833 8,075 + j3,456 890 2,581 + j6,913 7,884 + j3,797 900 2,629 + j6,970 7,773 + j4,100 910 2,601 + j7,063 7,609 + j4,449 920 2,570 + j7,091 7,495 + j4,773 930 2,529 + j7,134 7,360 + j5,069 940 2,423 + j7,171 7,152 + j5,365 950 2,385 + j7,246 7,079 + j5,709 960 2,265 + j7,338 6,952 + j6,071 Doc ID 18092 Rev 1 STEVAL-TDR019V1 Test circuit 3 Test circuit Figure 2. Test circuit schematic Vcc 1+ MSub R3 + B1 C3 FR4 H=20 mil R2 2- B2 C4 C5 C1 L1 C2 R1 TL4 TL5 TL6 C11 RFin TL1 C6 C8 Table 4. TL2 C9 C7 RFout C12 TL3 C10 LDMOS PD85004 Part list Component ID Description B1 Value Case size Manufacturer Part code Ferrite bead Panasonic EXCELDRC35C B2 Ferrite bead Panasonic EXCELDRC35C C1, C2 Capacitor 120 pF 0603 Murata GRM39-C0G121J50D500 C3 Capacitor 1 nF 0603 Murata GRM39-X7R102K50C560 C4 Capacitor 10 nF 0603 Murata GRM39-X7R103K50C560 C5 Capacitor 10 uF SMT Panasonic EEVHB1V100P C6, C7 Capacitor 39 pF 0603 Murata GRM39-C0G390J50D500 C8 Capacitor 3.3 pF 0603 Murata GRM39-C0G3R3C50Z500 C9 Capacitor 12 pF 0603 Murata GRM39-C0G120J50D500 C10 Capacitor 22 pF 0603 Murata GRM39-C0G220J50D500 C11 Capacitor 6,8 pF 0603 Murata GRM39-C0G6R8D50Z500 C12 Capacitor 1,5 pF 0603 Murata GRM39-C0G1R5C50Z500 L1 Inductor 12.55 nH Coilcraft 1606-10 Doc ID 18092 Rev 1 5/9 Test circuit Table 4. STEVAL-TDR019V1 Part list (continued) Component ID Description Value Case size R1 Resistor 150 Ω 0603 R2 Potentiometer 10 kΩ R3 Resistor 1K Manufacturer Part code Tyco electronics 3214W-1-103E 0603 TL1 L=13.6 mm TL2 L=3.5 mm TL3 01623440-1 L=4.2 mm Transmission line W = 0.92 mm TL4 L=3.8 mm TL5 L=4.2 mm TL6 L=11.3 mm RF in, RF out SMA-CONN PD85004 LDMOS Board Figure 3. 6/9 50 Ω 60 mils Johnson 142-0701-801 STMicroelectronics PD85004 FR-4 THk=0.020" 2 OZ Cu both sides Demonstration board photo Doc ID 18092 Rev 1 STEVAL-TDR019V1 4 Circuit layout Circuit layout Figure 4. Test fixture component layout Doc ID 18092 Rev 1 7/9 Revision history 5 STEVAL-TDR019V1 Revision history Updated Table 5. 8/9 Document revision history Date Revision 12-Oct-2010 1 Changes Initial release. Doc ID 18092 Rev 1 STEVAL-TDR019V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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