Demonstration board using the PD85004
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.
STEVAL-TDR019V1
for 900 MHz 2-way radio
Table 1. Device summary
Part number Mechanical specification
STEVAL-TDR019V1 L = 60 mm, W = 30 mm
October 2010 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 Electrical characteristics
1 Electrical characteristics
TA = +25 oC, VDD = 13.6 V, I
= 50 mA
dq
Table 2. Electrical specifications
Symbol Test conditions Min Typ Max Unit
Frequency Frequency range 860 960 MHz
P
OUT
Gain @ P
ND @ P
H2 2nd harmonic @ P
H3 3rd harmonic @ P
= 19 dBm 17.4 ± 0.3 dB
IN
= 19 dBm 56 - 65 %
IN
= 4 W -30 / -38 dBc
OUT
= 4 W -50 / -62 dBc
OUT
VSWR Load mismatch all phases @ P
= 4 W 20:1
OUT
4W
Doc ID 18092 Rev 1 3/9
Impedance STEVAL-TDR019V1
2 Impedance
Figure 1. Impedance illustration
Z
Z
GS
IN
Table 3. Impedance data
D
G
S
ZDL
F (MHz) Z
GS
Z
DL
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
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STEVAL-TDR019V1 Test circuit
3 Test circuit
Figure 2. Test circuit schematic
Vcc
1 +
MSub
FR4
H=20 mil
R3
R2
C1
B1
B2
C3
+
C5C4
2 -
C2
TL5TL4
C11 C12
TL6 RFout
C7
C6
C8
Table 4. Part list
R1
C9 C10
L1
TL3TL1 TL2RFin
LDMOS
PD85004
Component ID Description Value Case size Manufacturer Part code
B1 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 STEVAL-TDR019V1
Table 4. Part list (continued)
Component ID Description Value Case size Manufacturer Part code
R1 Resistor 150 Ω 0603
Tyco electronicsR2 Potentiometer 10 kΩ 3214W-1-103E
R3 Resistor 1 K 0603 01623440-1
TL1
TL2 L=3.5 mm
TL3 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 50 Ω 60 mils Johnson 142-0701-801
PD85004 LDMOS STMicroelectronics PD85004
Board FR-4 THk=0.020" 2 OZ Cu both sides
L=13.6 mm
Figure 3. Demonstration board photo
6/9 Doc ID 18092 Rev 1
STEVAL-TDR019V1 Circuit layout
4 Circuit layout
Figure 4. Test fixture component layout
Doc ID 18092 Rev 1 7/9
Revision history STEVAL-TDR019V1
5 Revision history
Updated
Table 5. Document revision history
Date Revision Changes
12-Oct-2010 1 Initial release.
8/9 Doc ID 18092 Rev 1
STEVAL-TDR019V1
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