STEVAL-TDR021V1
Demonstration board using the
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.
Table 1.
Device summary
Part number
STEVAL-TDR021V1
Mechanical specification
L = 60 mm, W = 30 mm
October 2010 Doc ID 18100 Rev 1 1/11
www.st.com
11
3
4
1
2
5
6
Contents
Contents
STEVAL-TDR021V1
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Circuit layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2/11 Doc ID 18100 Rev 1
STEVAL-TDR021V1 Electrical characteristics
T
A
= + 25 °C, V
DD
= 7.5 V, I dq
= 50 mA
Table 2.
Symbol
Electrical specification
Test conditions
Freq Frequency range
P
OUT
Gain
ND
H2
H3
@ P
IN
= 26 dB
@ P
IN
= 26 dB
2
ND
Harmonic @ P
IN
= 26 dB
3
RD
Harmonic @ P
IN
= 26 dB
VSWR Load mismatch all phases @ P
OUT
= 5 W
Min.
740
Typ.
5
11
± 1.0
49 - 54
-46 / -60
-54 / -60
Infinite
Max.
950
Unit
MHz
W dB
%
dBc
dBc
Doc ID 18100 Rev 1 3/11
Impedance
2 Impedance
Figure 1.
Impedance graphic
D
Z
DL
Z
IN
Z
GS
G
S
4/11
Table 3.
Impedance data
F (MHz)
850
860
870
880
810
820
830
840
740
750
760
770
780
790
800
890
900
910
920
930
940
950
Z
GS
1.87 - j5.74
1.84 - j5.65
1.83 - j5.55
1.81 - j5.43
1.79 - j5.30
1.74 - j5.19
1.70 - j5.13
1.67 - j5.05
1.68 - j4.97
1.69 - j4.89
1.69 - j4.80
1.68 - j4.72
1.67 - j4.68
1.66 - j4.61
1.66 - j4.54
1.66 - j4.48
1.61 - j4.37
1.54 - j4.26
1.48 - j4.18
1.43 - j4.12
1.36 - j4.04
1.33 - j3.98
Doc ID 18100 Rev 1
STEVAL-TDR021V1
Z
DL
3.04 - j6.19
3.10 - j6.13
3.17 - j6.09
3.26 - j6.04
3.35 - j5.60
3.43 - j5.98
3.51 - j6.02
3.61 - j6.09
3.70 - j6.20
3.82 - j6.32
3.91 - j6.48
3.94 - j6.70
3.90 - j6.96
3.82 - j7.22
3.67 - j7.48
3.47 - j7.65
3.17 - j7.74
2.85 - j7.79
2.48 - j7.81
2.12 - j7.77
1.77 - j7.67
1.49 - j7.51
STEVAL-TDR021V1 Typical performance
Figure 2.
Output power vs. frequency
Vdd = 7.2 V - Idq = 200 mA
6
Figure 3.
Gain vs. frequency
Vdd = 7.2 V - Idq = 200 mA
14
Pin=25 dBm Pin=26 dBm
13
5
12
4
11
3
10
2
9
Pin=25 dBm Pin=26 dBm
1
700 720 740 760 780 800 820 840 860 880 900 920 940 960 980 1000
Freq (MHz)
8
700 720 740 760 780 800 820 840 860 880 900 920 940 960 980 1000
Freq (MHz)
Figure 4.
Input return loss vs. frequency
Vdd = 7.2 V - Idq = 200 mA
0
-1
-2
-3
Pin=25 dBm Pin=26 dBm
-4
-5
-6
-7
-8
700 720 740 760 780 800 820 840 860 880 900 920 940 960 980 1000
Freq (MHz)
Figure 5.
Efficiency vs. frequency
Vdd = 7.2 V - Idq = 200 mA
60
50
40
Pin=25 dBm Pin=26 dBm
30
700 720 740 760 780 800 820 840 860 880 900 920 940
Freq (MHz)
960 980 1000
Doc ID 18100 Rev 1 5/11
Typical performance STEVAL-TDR021V1
Figure 6.
Gain vs. output
Vdd = 7.2 V - Idq = 200 mA
16
15
14
13
12
11
10
9
8
0 0.5
1 1.5
740 MHz 850 MHz
2 2.5
3 3.5
Pout (W)
950 MHz
4 4.5
5 5.5
6
Figure 7.
Harmonics vs. frequency Pin = 26 dBm Vdd = 7.2 V - Idq = 200 mA
-40
-45
-50
-55
-60
H2 H3
-65
-70
720 740 760 780 800 820 840 860 880 900 920 940 960 980
Freq (MHz)
6/11 Doc ID 18100 Rev 1
STEVAL-TDR021V1 Test circuit
Figure 8.
Test circuit schematic
MSub
FR4
H=20 mil
R3
R2
RFin
C6
TL1
C7
C8
TL2
B1
B2
C3 C4
Vcc
+
C5
1 +
2 -
C1
R1
TL3
C9
LDMOS
PD84008L
L1
C2
TL4
C10
TL5 TL6
C11 C12
C13
RFout
Table 4.
Component part list
Component ID Description
B1
B2
Ferrite bead
Ferrite bead
C1, C2
C3
C4
C5
C6, C13
C7, C8
C9, C10
C11
C12
L1
R1
R2
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Inductor
Resistor
Potentiometer
Value
150 pF
1 nF
10 nF
10 µF
39 pF
3,9 pF
18 pF
Case size
0603
0603
0603
SMT
0603
0603
0603
Manufacturer
Panasonic
Panasonic
Murata
Murata
Murata
Panasonic
Murata
Murata
Murata
8.2 pF 0603 Murata
2 pF
12.55 nH
510
Ω
1 k
Ω
0603
0603
Doc ID 18100 Rev 1
Murata
Coilcraft
Tyco electronics
Bourns electronics
Part code
EXCELDRC35C
EXCELDRC35C
GRM39-
C0G151J50D500
GRM39-
COG102J50D500
GRM39-
X7R103K50C560_
EEVHB1V100P
GRM39-
C0G390J50D500
GRM39-
C0G3R9C50Z500
GRQ706-
C0G180J50K500
GRM39-
C0G8R2D50Z500
GRQ706-
C0G020C100K500
1606-10
3224W-1-102
7/11
Test circuit
Table 4.
Component ID
R3
Component part list (continued)
Description
Resistor
Value
100
Ω
TL1
Transmission
Line
Case size
0603
W=0.92 mm L=12,5 mm
TL2
TL3
TL4
TL5
TL6
RF in, RF out
PD84008L-E
Board
Transmission
Line
Transmission
Line
Transmission
Line
Transmission
Line
Transmission
Line
SMA-CONN
LDMOS
W=0.92 mm
W=0.92 mm
W=0.92 mm
W=0.92 mm
L=3,5 mm
L=2,6 mm
L=1,8 mm
L=5,3 mm
W=0.92 mm L=10.0 mm
Manufacturer
Tyco electronics
50
Ω
60 mils Johnson
STMicroelectronics
FR-4 THk=0.020" 2OZ Cu both sides
STEVAL-TDR021V1
Part code
01623440-1
142-0701-801
PD84008L-E
8/11 Doc ID 18100 Rev 1
STEVAL-TDR021V1
Figure 9.
Circuit layout
Circuit layout
Doc ID 18100 Rev 1 9/11
Revision history
Table 5.
Date
14-Oct-2010
Document revision history
Revision
1 Initial release
Changes
STEVAL-TDR021V1
10/11 Doc ID 18100 Rev 1
STEVAL-TDR021V1
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Doc ID 18100 Rev 1 11/11
