ST TDR021V1 User Manual
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
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
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
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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