RF power amplifier using 1 x PD55025-E
N-channel enhancement-mode lateral MOSFETs
Features
■ Excellent thermal stability
■ Frequency: 460 - 540 MHz
■ Supply voltage: 13.6 V
■ Output power: 20 W
■ Gain: 13.3 dB typ.
■ Efficiency: 51% - 66%
■ Load mismatch: 20:1
■ BeO free amplifier
■ In compliance with the 2002/95/EC European
directive
Description
STEVAL-TDR023V1
Mechanical specification:
L = 70 mm, W = 30 mm
The STEVAL-TDR023V1 is a common source
N-channel enhancement-mode lateral field effect
RF power amplifier designed for UHF mobile radio
applications.
Table 1. Device summary
Part number
STEVAL-TDR023V1
October 2010 Doc ID 18048 Rev 1 1/8
www.st.com
8
Contents STEVAL-TDR023V1
Contents
1 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Circuit layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2/8 Doc ID 18048 Rev 1
STEVAL-TDR023V1 Electrical characteristics
1 Electrical characteristics
TA = + 25 °C, VDD = 13.6 V, I
= 150 mA
dq
Table 2. Electrical specification
Symbol Test conditions Min. Typ. Max. Unit
Freq Frequency range 460 540 MHz
P
OUT
Gain @ P
Gain
flatness
@ P
Efficiency @ P
H2 @ P
H3 @ P
= 20W 13.3 dB
OUT
= 20W ± 1.5 dB
OUT
= 20W 51 - 66 %
OUT
= 20W -48 -55 dB
OUT
= 20W -55 -60 dB
OUT
VSWR Load Mismatch all phases @ P
= 20W 20:1
OUT
20 W
Doc ID 18048 Rev 1 3/8
Test circuit STEVAL-TDR023V1
2 Test circuit
Figure 1. Test circuit schematic
4/8 Doc ID 18048 Rev 1
STEVAL-TDR023V1 Circuit layout
3 Circuit layout
Figure 2. Circuit layout
Table 3. Component part list
Part type
CAP C1 Capacitor 150pF 1206 Murata
CAP C2 Capacitor 150pF 1206 Murata
CAP C3 Capacitor 1 nF 1206 Murata
CAP C4 Capacitor 10 nF 1206 Murata
Electrolytic
CAP
Tantalum
CAP
Component
ID
Description Value Case size Manufacturer Part code
C5 Capacitor 220 µF
C6 Capacitor 1 µF
6C0G151J50
6C0G151J50
6C0G102J50
6X7R104K50
CAP C7 Capacitor 47pF 100B ATC 470
CAP C8 Capacitor 3.3pF 100B ATC 3R3
CAP C9 Capacitor 6.8pF 100B ATC 6R8
CAP C10 Capacitor 39pF 100B ATC 390
CAP C11 Capacitor 39pF 100B ATC 390
GRM42-
GRM42-
GRM42-
GRM42-
Doc ID 18048 Rev 1 5/8
Circuit layout STEVAL-TDR023V1
Table 3. Component part list (continued)
Part type
Component
ID
Description Value Case size Manufacturer Part code
CAP C12 Capacitor 5.6pF 100B ATC 5R6
CAP C13 Capacitor 3.9pF 100B ATC 3R9
CAP C14 Capacitor 47pF 100B ATC 470
TL TL1, TL7
TL TL2
TL TL3, TL4
TL TL5
TL TL6
Transmission
Line
Transmission
Line
Transmission
Line
Transmission
Line
Transmission
Line
W = 2.87 mm L = 6 mm
W = 4.9 mm L = 5 mm
W = 6 mm L = 3 mm
W = 4.9 mm L = 2.5 mm
W = 4.9 mm L = 2.5 mm
Ferrite bead B1 Ferrite Bead PANASONIC EXCELDRC35C
Ferrite bead B2 Ferrite Bead PANASONIC EXCELDRC35C
INDUCTOR L1 Inductor 43nH
INDUCTOR L2 Inductor 5nH
INDUCTOR L3 Inductor 5nH
Coilcraft Mini
Spring
Coilcraft Mini
Spring
Coilcraft Mini
Spring
B10TJ
A02TJ
A02TJ
Transistor PD55025-E LDMOS STMicroelectronics PD55025-E
Resistor R1 Resistor 15 ohms 1206
POT R2 Potentiometer 10 K
TYCO
ELECTRONICS
BOURNS
ELECTRONICS
01623440-1
3214W-1-103E
Resistor R3 Resistor 1K 1206
TYCO
ELECTRONICS
01623440-1
SMA-CONN RF in SMA-CONN Johnson 142-0701-801
SMA-CONN RF out SMA-CONN Johnson 142-0701-801
ZENER D1 Zener Diode 5.1 V SOD110 PHILIPS BZX284C5V1
Board FR-4 THk=0.060" 2OZ Cu Both Sides
6/8 Doc ID 18048 Rev 1
STEVAL-TDR023V1 Revision history
4 Revision history
Table 4. Document revision history
Date Revision Changes
11-Oct-2010 1 Initial release.
Doc ID 18048 Rev 1 7/8
STEVAL-TDR023V1
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