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 Mechanical specification: L = 60 mm, W = 30 mm 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 October 2010 Doc ID 18079 Rev 1 1/8 www.st.com 8 Contents STEVAL-TDR022V1 Contents 1 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Circuit layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2/8 Doc ID 18079 Rev 1 STEVAL-TDR022V1 1 Electrical characteristics Electrical characteristics TA = + 25 °C, VDD = 15 V, Idq = 220 mA Table 2. Electrical specification Symbol Test conditions Freq Frequency range POUT 2 Tones test - DF = 600 kHz Gain @ POUT = 10 WPEP ID Min. Typ. 340 Unit 520 MHz 10 WPEP 16.5 dB Drain current @ 10W PEP nd Max. 1.25 A H2 2 harmonic @ POUT = 10 WPEP -37 / -60 dB H3 3rd harmonic @ POUT = 10 WPEP -60 / -68 dB VSWR Load mismatch all phases @ POUT = 10 W Doc ID 18079 Rev 1 20:1 3/8 Test circuit STEVAL-TDR022V1 2 Test circuit Figure 1. Test circuit schematic R1 D1 B1 MSub R2 MSUB FR4_60 H=1.52 mm L1 L3 R5 L2 L4 L5 C7 C5 L7 C9 C10 C12 P2 C11 C8 C13 LDMOS Model=PD85025-E 4/8 L6 R6 R4 C16 C4 C14 C15 C6 C3 C1 R3 P1 B2 C2 Doc ID 18079 Rev 1 C17 Vcc_2P STEVAL-TDR022V1 Circuit layout 3 Circuit layout Figure 2. Circuit layout Table 3. Component 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 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 µF SMT Panasonic 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 µF 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 Doc ID 18079 Rev 1 5/8 Circuit layout Table 3. STEVAL-TDR022V1 Component part list (continued) Component ID Description Value L2, L7 Inductor L3, L5 Manufacturer Part code 12.5 nH Coilcraft A04TJLB Inductor 2,5 nH Coilcraft A01TKLB L4, L6 Inductor 5 nH Coilcraft A02TJLB R1 Resistor 1 kΩ Tyco Electronics 01623440-1 R2 Potentiometer 10 kΩ Bourns Electronics 3214W-1-103E R3 Resistor 16 Ω 1206 Bourns Electronics R7 Resistor 0Ω 1206 Bourns Electronics R4, R5, R6 Resistor 2.2 Ω 603 VISHAY D11/CRCW0603 Vcc_2P Connector DC 2 poli 2.54mm Phoenix Contact 1725656 P1_P2 RF Connector SMA_Female Flange solder Q Board 6/8 LDMOS PD85025-E Case size 1206 1.54 mm STMicroelectronics FR-4 THk=0.060" 2OZ Cu both sides Doc ID 18079 Rev 1 PD85025-E STEVAL-TDR022V1 4 Revision history Revision history Table 4. Document revision history Date Revision 11-Oct-2010 1 Changes Initial release Doc ID 18079 Rev 1 7/8 STEVAL-TDR022V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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