Portable UHF 2-way radio demonstration board
Features
■ Excellent thermal stability
■ Frequency: 380 - 520 MHz
■ Supply voltage: 7.2 V
■ Output power: 1 W
■ Power gain: 15.5 ± 0.7 dB
■ Efficiency: 58 % - 67 %
■ Load mismatch: 20:1
■ BeO-free amplifier
Description
The STEVAL-TDR025V1 demonstration board is
a portable UHF 2-way radio designed as a
platform for valuating the performance of the
PD84001 LDMOS RF power transistor.
STEVAL-TDR025V1
based on the PD84001
Preliminary data
Table 1. Device summary
Order code Mechanical specification
STEVAL-TDR025V1 L = 60 mm, W = 30 mm
October 2010 Doc ID 18122 Rev 1 1/10
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
www.st.com
10
Contents STEVAL-TDR025V1
Contents
1 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2/10 Doc ID 18122 Rev 1
STEVAL-TDR025V1 Electrical characteristics
1 Electrical characteristics
TA = + 25 °C, VDD = 7.2 V, I
= 100 mA
dq
Table 2. Electrical specifications
Symbol Test conditions Min. Typ. Max. Unit
Freq Frequency range 380 520 MHz
P
OUT
Gain @ P
ND @ P
H2 2nd harmonic @ P
H3 3rd harmonic @ P
= 15 dBm 15.5 ± 0.7 dB
IN
= 15 dBm 58 - 67 %
IN
= 15 dBm TBD dBc
IN
= 15 dBm TBD dBc
IN
VSWR Load mismatch all phases @ P
= 1 W 20:1
OUT
1W
Doc ID 18122 Rev 1 3/10
Impedance STEVAL-TDR025V1
2 Impedance
Figure 1. Impedance illustration
Z
Z
GS
IN
Table 3. Impedance data
D
G
S
ZDL
f (MHz) Z
GS
Z
DL
380 8.53 + j1.78 18.79 + j8.37
410 7.84 + j4.05 17.15 + j7.78
440 7.29 + j6.3 15.56 + j7.95
470 6.77 + j8.63 14.08 + j8.58
500 6.36 + j10.91 12.8 + j9.53
520 6.13 + j12.5 12.05 + j10.3
4/10 Doc ID 18122 Rev 1
STEVAL-TDR025V1 Typical performance
3 Typical performance
Figure 2. Output power vs. frequency
2.2
1.8
1.4
Output Power (W)
0.6
0.2
Vdd = 7.2 V, Idq = 100 mA
Pin=15dBm
1
360 380 400 420 440 460 480 500 520 540
Frequency (MHz)
Figure 4. Gain vs. frequency
Vdd = 7.2 V, Idq = 100 mA
Figure 3. Efficiency vs. frequency
Vdd = 7.2 V, Idq = 100 mA
100
90
80
70
60
Efficiency (%)
50
40
30
20
360 380 400 420 440 460 480 500 520 540
Pin=15dBm
Frequenc y (MHz)
Figure 5. Input return loss vs. frequency
Vdd = 7.2 V, Idq = 100 mA
18
17
16
15
Gain (dB)
14
13
12
360 380 400 420 440 460 480 500 520 540
Pin=15dBm
Frequency (MHz)
0
-1
-2
-3
-4
Input Return Loss (dB)
-5
Pin=15dBm
-6
360 380 400 420 440 460 480 500 520 540
Frequency (MHz)
Doc ID 18122 Rev 1 5/10
Typical performance STEVAL-TDR025V1
Figure 6. Output power vs. input power
Output Power (dBm )
Vdd = 7.2 V, Idq = 100 mA
36
34
32
30
28
26
24
22
20
2 4 6 8 10 12 14 16 18 20 22
Input Power (dBm)
380 MHz
440 MHz
470 MHz
520 MHz
Figure 8. Output power vs. supply voltage
Output Power (W)
Pin = 15 dBm, Idq = 100 mA
36
35
34
33
32
31
30
29
28
27
26
4567891011
Supply Voltage (V)
380 MHz
440 MHz
470 MHz
520 MHz
Figure 7. Efficiency vs. output power
Vdd = 7.2 V, Idq = 100 mA
80
70
60
50
40
Efficiency (%)
30
20
10
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
380 MHz
440 MHz
470 MHz
520 MHz
Output Pow er (W)
6/10 Doc ID 18122 Rev 1
STEVAL-TDR025V1 Test circuit
4 Test circuit
Figure 9. Test circuit schematic
Vc c
1 +
MSu b
FR4
H= 2 0 m i l
R3
R2
C1
B1
B2
C2
L1
2 -
C3
R1
C4
TL 1RFin
C6
C7
L2
C8
TL 4TL3TL2
LDMOS
PD 84001 L
PD84001
TL 5
TL6 TL7
L3
C9
C1 0
Table 4. 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 0603 Murata GRM39-C0G121J50D500
C3 Capacitor 1 µF 0603 Murata GRM39-X5R105K16D52K
C4, C5 Capacitor 39 pF 0603 Murata GRM39-C0G390J50D500
C6 Capacitor 1.2 pF 0603 Murata GRM39-C0G1R2C50Z500
C7 Capacitor 3.9 pF 0603 Murata GRM39-C0G3R9C50Z500
C8 Capacitor 12 pF 0603 Murata GRM39-C0G120J50D500
C9 Capacitor 5.6 pF 0603 Murata GRM39-C0G5R6D50Z500
C10 Capacitor 3.3 pF 0603 Murata GRM39-C0G3R3C50Z500
RFout
C5
L1 Inductor 12.55 nH Coilcraft 1606-10
L2,L3 Inductor 5.4 nH Coilcraft 0906-4
R1 Resistor 510 Ω 0603 Tyco Electronics
R2 Potentiometer 10 kΩ Bourns Electronics 3214W-1-103E
R3 Resistor 1 k 0603 Tyco Electronics 01623440-1
TL1 Transmission line W=0.92 mm L=10.5 mm
TL2 Transmission line W=0.92 mm L=0.8 mm
TL3 Transmission line W=0.92 mm L=1.0 mm
Doc ID 18122 Rev 1 7/10
Test circuit STEVAL-TDR025V1
Table 4. Part list (continued)
Component ID Description Value Case size Manufacturer Part code
TL4 Transmission line W=0.92 mm L=4.5 mm
TL5 Transmission line W=0.92 mm L=3.6 mm
TL6 Transmission line W=0.92 mm L=1.5 mm
TL7 Transmission line W=0.92 mm L=10.0 mm
RF in, RF out SMA-CONN 50 Ω 60 mils JOHNSON 142-0701-801
PD84001 LDMOS STMicroelectronics PD84001
Board FR-4 THk=0.020" 2 OZ Cu both sides
Figure 10. Demonstration board photo
8/10 Doc ID 18122 Rev 1
STEVAL-TDR025V1 Revision history
5 Revision history
Table 5. Document revision history
Date Revision Changes
19-Oct-2010 1 Initial release
Doc ID 18122 Rev 1 9/10
STEVAL-TDR025V1
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10/10 Doc ID 18122 Rev 1
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