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PD84008L-E for 900 MHz 2-way radio
Features
■ Excellent thermal stability
■ Frequency: 740 - 950 MHz
■ Supply voltage: 7.2 V
■ Output power: 5 W
■ Power gain: 11 ± 1.0 dB
■ Efficiency: 48 % - 54%
■ Load mismatch: infinite
■ BeO free amplifier
Description
The STEVAL-TDR021V1 is a demonstration
board using the PD84008L-E LDMOS transistor.
It is designed for 2-way UHF portable radio
applications.
STEVAL-TDR021V1
Demonstration board using the
Table 1. Device summary
Part number Mechanical specification
STEVAL-TDR021V1 L = 60 mm, W = 30 mm
October 2010 Doc ID 18100 Rev 1 1/11
www.st.com
11
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Contents STEVAL-TDR021V1
Contents
1 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Circuit layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2/11 Doc ID 18100 Rev 1
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STEVAL-TDR021V1 Electrical characteristics
1 Electrical characteristics
TA = + 25 °C, VDD = 7.5 V, I
= 50 mA
dq
Table 2. Electrical specification
Symbol Test conditions Min. Typ. Max. Unit
Freq Frequency range 740 950 MHz
P
OUT
Gain @ P
ND @ P
H2 2
H3 3
= 26 dB 11 ± 1.0 dB
IN
= 26 dB 49 - 54 %
IN
ND
Harmonic @ PIN = 26 dB -46 / -60 dBc
RD
Harmonic @ PIN = 26 dB -54 / -60 dBc
VSWR Load mismatch all phases @ P
= 5 W Infinite
OUT
5W
Doc ID 18100 Rev 1 3/11
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Impedance STEVAL-TDR021V1
2 Impedance
Figure 1. Impedance graphic
Table 3. Impedance data
F (MHz) Z
740 1.87 - j5.74 3.04 - j6.19
750 1.84 - j5.65 3.10 - j6.13
760 1.83 - j5.55 3.17 - j6.09
770 1.81 - j5.43 3.26 - j6.04
780 1.79 - j5.30 3.35 - j5.60
790 1.74 - j5.19 3.43 - j5.98
D
Z
IN
Z
GS
G
S
GS
ZDL
Z
DL
800 1.70 - j5.13 3.51 - j6.02
810 1.67 - j5.05 3.61 - j6.09
820 1.68 - j4.97 3.70 - j6.20
830 1.69 - j4.89 3.82 - j6.32
840 1.69 - j4.80 3.91 - j6.48
850 1.68 - j4.72 3.94 - j6.70
860 1.67 - j4.68 3.90 - j6.96
870 1.66 - j4.61 3.82 - j7.22
880 1.66 - j4.54 3.67 - j7.48
890 1.66 - j4.48 3.47 - j7.65
900 1.61 - j4.37 3.17 - j7.74
910 1.54 - j4.26 2.85 - j7.79
920 1.48 - j4.18 2.48 - j7.81
930 1.43 - j4.12 2.12 - j7.77
940 1.36 - j4.04 1.77 - j7.67
950 1.33 - j3.98 1.49 - j7.51
4/11 Doc ID 18100 Rev 1
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STEVAL-TDR021V1 Typical performance
3 Typical performance
Figure 2. Output power vs. frequency
6
5
4
Pout (W)
3
2
1
700 720 740 760 780 800 820 840 860 880 900 920 940 960 980 1000
Vdd = 7.2 V - Idq = 200 mA
Pin=25 dBm Pin=26 dBm
Freq (MHz)
Figure 4. Input return loss vs. frequency
0
Vdd = 7.2 V - Idq = 200 mA
Figure 3. Gain vs. frequency
Vdd = 7.2 V - Idq = 200 mA
14
13
12
11
Gain (dB)
10
9
8
700 720 740 760 780 800 820 840 860 880 900 920 940 960 980 1000
Pin=25 dBm Pin=26 dBm
Freq (MHz)
Figure 5. Efficiency vs. frequency
Vdd = 7.2 V - Idq = 200 mA
60
-1
-2
-3
-4
IRL (dB)
-5
-6
-7
-8
700 720 740 760 780 800 820 840 860 880 900 920 940 960 980 1000
Pin=25 dBm Pin=26 dBm
Freq (MHz)
50
Eff (%)
40
Pin=25 dBm Pin=26 dBm
30
700 720 740 760 780 800 820 840 860 880 900 920 940 960 980 1000
Freq (MHz)
Doc ID 18100 Rev 1 5/11
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Typical performance STEVAL-TDR021V1
Figure 6. Gain vs. output
16
15
14
13
12
Gain (dB)
11
10
9
8
Vdd = 7.2 V - Idq = 200 mA
740 MHz 850 MHz 950 MHz
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
Pout (W)
Figure 7. Harmonics vs. frequency Pin = 26
dBm Vdd = 7.2 V - Idq = 200 mA
-40
-45
-50
-55
Harmonics (dBc)
-60
-65
-70
720 740 760 780 800 820 840 860 880 900 920 940 96 0 980
H2 H3
Freq (MHz)
6/11 Doc ID 18100 Rev 1
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STEVAL-TDR021V1 Test circuit
4 Test circuit
Figure 8. Test circuit schematic
Vcc
1 +
MSub
FR4
H=20 mil
RFin
R3
R2
R1
C6
C7
TL2TL1 TL3
C8
C9
C1
B1
LDMOS
PD84008L
B2
C2
L1
TL5TL4
C3 C4 C5
2 -
+
C13
C12C11C10
RFoutTL6
Table 4. 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 150 pF 0603 Murata
C3 Capacitor 1 nF 0603 Murata
C4 Capacitor 10 nF 0603 Murata
C5 Capacitor 10 µF SMT Panasonic EEVHB1V100P
C6, C13 Capacitor 39 pF 0603 Murata
C7, C8 Capacitor 3,9 pF 0603 Murata
C9, C10 Capacitor 18 pF 0603 Murata
C11 Capacitor 8.2 pF 0603 Murata
C12 Capacitor 2 pF 0603 Murata
L1 Inductor 12.55 nH Coilcraft 1606-10
R1 Resistor 510 Ω 0603 Tyco electronics
GRM39-
C0G151J50D500
GRM39-
COG102J50D500
GRM39-
X7R103K50C560_
GRM39-
C0G390J50D500
GRM39-
C0G3R9C50Z500
GRQ706-
C0G180J50K500
GRM39-
C0G8R2D50Z500
GRQ706-
C0G020C100K500
R2 Potentiometer 1 kΩ Bourns electronics 3224W-1-102
Doc ID 18100 Rev 1 7/11
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Test circuit STEVAL-TDR021V1
Table 4. Component part list (continued)
Component ID Description Value Case size Manufacturer Part code
R3 Resistor 100 Ω 0603 Tyco electronics 01623440-1
TL1
TL2
TL3
TL4
TL5
TL6
RF in, RF out SMA-CONN 50 Ω 60 mils Johnson 142-0701-801
PD84008L-E LDMOS STMicroelectronics PD84008L-E
Board FR-4 THk=0.020" 2OZ Cu both sides
Transmission
Line
Transmission
Line
Transmission
Line
Transmission
Line
Transmission
Line
Transmission
Line
W=0.92 mm L=12,5 mm
W=0.92 mm L=3,5 mm
W=0.92 mm L=2,6 mm
W=0.92 mm L=1,8 mm
W=0.92 mm L=5,3 mm
W=0.92 mm L=10.0 mm
8/11 Doc ID 18100 Rev 1
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STEVAL-TDR021V1 Circuit layout
5 Circuit layout
Figure 9. Circuit layout
Doc ID 18100 Rev 1 9/11
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Revision history STEVAL-TDR021V1
6 Revision history
Table 5. Document revision history
Date Revision Changes
14-Oct-2010 1 Initial release
10/11 Doc ID 18100 Rev 1
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STEVAL-TDR021V1
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Doc ID 18100 Rev 1 11/11
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