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.
STEVAL-TDR022V1
Mechanical specification:
L = 60 mm, W = 30 mm
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 Electrical characteristics
1 Electrical characteristics
TA = + 25 °C, VDD = 15 V, I
= 220 mA
dq
Table 2. Electrical specification
Symbol Test conditions Min. Typ. Max. Unit
Freq Frequency range 340 520 MHz
P
OUT
Gain @ P
I
H2 2
H3 3
VSWR Load mismatch all phases @ P
2 Tones test - DF = 600 kHz 10 WPEP
= 10 WPEP 16.5 dB
OUT
Drain current @ 10W PEP 1.25 A
D
nd
harmonic @ P
rd
harmonic @ P
= 10 WPEP -37 / -60 dB
OUT
= 10 WPEP -60 / -68 dB
OUT
= 10 W 20:1
OUT
Doc ID 18079 Rev 1 3/8
Test circuit STEVAL-TDR022V1
2 Test circuit
Figure 1. Test circuit schematic
MSub
MSUB
FR4 _6 0
H= 1. 52 mm
L5L4L2
P1
C6
C16 C7 C8
D1
R2
C1
R3
C15
R5
R6
R4
C13
R1
LDMOS
Model=PD85025-E
B2
B1
C2
C14
L1
L3
C9
C11
C3 C4 C5
C12
L7L6
C10
C17
Vcc_2P
P2
4/8 Doc ID 18079 Rev 1
STEVAL-TDR022V1 Circuit layout
3 Circuit layout
Figure 2. Circuit layout
Table 3. 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 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 STEVAL-TDR022V1
Table 3. Component part list (continued)
Component ID Description Value Case 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 kΩ 1206 Tyco Electronics 01623440-1
R2 Potentiometer 10 kΩ Bourns Electronics 3214W-1-103E
R3 Resistor 16 Ω 1206 Bourns Electronics
R7 Resistor 0 Ω 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 1.54 mm
Q LDMOS PD85025-E STMicroelectronics PD85025-E
Board FR-4 THk=0.060" 2OZ Cu both sides
6/8 Doc ID 18079 Rev 1
STEVAL-TDR022V1 Revision history
4 Revision history
Table 4. Document revision history
Date Revision Changes
11-Oct-2010 1 Initial release
Doc ID 18079 Rev 1 7/8
STEVAL-TDR022V1
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