Demonstration board using the PD84001 for UHF RFID reader
Features
■ Excellent thermal stability
■ Frequency: 860 - 960 MHz
■ Supply voltage: 7.2 V
■ Output power: 1 W
■ Power gain: 14.6 ± 0.4 dB
■ Efficiency: 51 % - 53 %
■ Load mismatch: 20:1
■ BeO-free amplifier
Description
STEVAL-TDR017V1
and 2-way radio
Mechanical specification:
L = 60 mm, W = 30 mm
The STEVAL-TDR017V1 is a demonstration
board using the PD84001 LDMOS transistor. It is
designed for UHF RFID reader and 2-way radio
applications.
Table 1. Device summary
Part number
STEVAL-TDR017V1
October 2010 Doc ID 18091 Rev 1 1/8
www.st.com
8
Contents STEVAL-TDR017V1
Contents
1 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2/8 Doc ID 18091 Rev 1
STEVAL-TDR017V1 Electrical characteristics
1 Electrical characteristics
TA = +25 oC, VDD = 7.2 V, I
= 50 mA
dq
Table 2. Electrical specifications
Symbol Test conditions Min Typ Max Unit
Freq Frequency range 860 960 MHz
P
OUT
Gain @ P
ND @ P
H2 2nd harmonic @ P
H3 3rd harmonic @ P
= 16 dBm 14.6 ± 0.4 dB
IN
= 16 dBm 51 - 53 %
IN
= 16 dBm -44 / -47 dBc
IN
= 16 dBm -51 / -57 dBc
IN
VSWR Load mismatch all phases @ P
=1 W 20:1
OUT
1W
Doc ID 18091 Rev 1 3/8
Impedance STEVAL-TDR017V1
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 4,36 + j1,91 5,67 - j0,89
870 4,41 + j2,00 5,58 - j0,69
880 4,46 + j2,07 5,52 - j0,43
890 4,48 + j2,15 5,41 - j0,20
900 4,51 + j2,19 5,32 + j0,03
910 4,53 + j2,22 5,26 + j0,25
920 4,57 + j2,30 5,203 + j0,47
930 4,51 + j2,31 5,07 + j0,68
940 4,53 + j2,34 5,05 + j0,93
950 4,53 + j2,34 4,99 + j1,13
960 4,49 + j2,34 4,92 + j1,31
4/8 Doc ID 18091 Rev 1
STEVAL-TDR017V1 Test circuit
3 Test circuit
Figure 2. Test circuit schematic
Vcc
1 +
MSub
FR4
H=20 mil
R3
B1
R2
C1
R1
B2
C2
L1
C3
2 -
RFin
TL5 TL6 TL7
C9
C4
TL1
C6
TL2 TL3 TL4
C7
C8
LDMOS
PD84001
C10
C11
C5
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 2.7 pF 0603 Murata GRM39-C0G2R7C50Z500
C7 Capacitor 6,8 pF 0603 Murata GRM39-C0G6R8D50Z500
C8 Capacitor 15 pF 0603 Murata GRM39-C0G150J50D500
RFout
C9 Capacitor 10 pF 0603 Murata GRM39-C0G100D50D500
C10 Capacitor 2.7 pF 0603 Murata GRM39-C0G2R7C50Z500
C11 Capacitor 1 pF 0603 Murata GRM39-C0G010C50Z500
L1 Inductor 12.55 nH Coilcraft 1606-10
R1 Resistor 510 Ω 0603 Tyco lectronics
R2 Potentiometer 10 KΩ Bourns electronics 3214W-1-103E
R3 Resistor 1 K 0603 Tyco electronics 01623440-1
Doc ID 18091 Rev 1 5/8
Test circuit STEVAL-TDR017V1
Table 4. Part list (continued)
Component ID Description Value Case size Manufacturer Part code
TL1 Transmission line W = 0.92mm L = 12,6 mm
TL2 Transmission line W = 0.92mm L = 3,55 mm
TL3 Transmission line W = 0.92mm L = 2,55 mm
TL4 Transmission line W = 0.92mm L = 1,8 mm
TL5 Transmission line W = 0.92mm L = 3.1 mm
TL6 Transmission line W = 0.92mm L = 8,8 mm
TL7 Transmission line W = 0.92mm L = 6,4 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" 2OZ Cu both sides
Figure 3. Demonstration board photo
6/8 Doc ID 18091 Rev 1
STEVAL-TDR017V1 Revision history
4 Revision history
Updated
Table 5. Document revision history
Date Revision Changes
11-Oct-2010 1 Initial release.
Doc ID 18091 Rev 1 7/8
STEVAL-TDR017V1
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8/8 Doc ID 18091 Rev 1
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