AP603
High Dynamic Range 7W 28V HBT Amplifier
869-894 MHz Reference Design
Typical WCDMA Performance at 25 °C
at a channel power of +30 dBm
Frequency
880 MHz
+30 dBm
18 dB
W-CDMA Channel Power
Power Gain
Input Return Loss
Output Return Loss
ACLR
11 dB
C7
7.5 dB
1000pF
-52 dBc
-52 dBc
220 mA
16.5 %
+38.5 dBm
160 mA
+5 V
IMD3 @ +30 dBm PEP
Operating Current, Icc
Collector Efficiency
Output P1dB
C28
6.8 nH
6.8 pF
See note 4
See note 5
Quiescent Current, Icq
Vpd, Vbias
C31
L24
2.2 nH
See note 3
3.3 pF
See note 6
Vcc
+28 V
Notes:
1. The primary RF microstrip line is 50 Ω.
2. Components shown on the silkscreen but not on the schematic are not used.
3. The center of L24 is placed at 0.090” (3.5° @ 880 MHz) from the center of C5.
4. The center of C28 is placed at 0.220” (8.4° @ 880 MHz) from the edge of the AP603 (U1).
5. The center of L4 is placed at 0.200” (7.7° @ 880 MHz) from the edge of the AP603 (U1).
6. The center of C31 is placed at 0.360” (13.8° @ 880 MHz) from the center of L4.
7. The bold-faced RF trace is for the DC bias feed. The stub’s length is approximately a ¼ λ.
8. The main RF trace is cut at component C28 and L4 for this particular reference design.
C28
L24
L4
C31
869-894 MHz Application Circuit Performance Plots
W-CDMA 3GPP Test Model 1+64 DPCH, 60% clipping, PAR = 8.6 dB @ 0.01% Probability, 3.84 MHz BW
Gain vs. Output Power vs. Frequency
S11, S22 vs. Frequency
Vcc = 28V, Icq = 160 mA, 25 ˚C
Efficiency vs. Output Power vs. Frequency
CW tone, Vcc = 28V, Icq = 160 mA, 25 ˚C
CW tone, Vcc = 28V, Icq = 160 mA, 25 ˚C
19
18
17
16
15
14
60
50
40
30
20
10
0
0
-5
869 MHz
880 MHz
894 MHz
-10
-15
-20
-25
869 MHz
S11
S22
880 MHz
894 MHz
0.75
0.8
0.85
0.9
0.95
30
32
34
36
38
40
14
18
22
26
30
34
38
Frequency (GHz)
Output Power (dBm)
Output Power (dBm)
ACLR1 vs. Output Power vs. Frequency
IMD vs. Output Power
Efficiency vs. Output Power vs. Frequency
CW 2-tone signal, 880 MHz, ∆f = 1 MHz, 28V, 160 mA Icq, 25 ˚C
WCDMA, Vcc = 28V, Icq = 160 mA, 25 ˚C
WCDMA, Vcc = 28V, Icq = 160 mA, 25 ˚C
-40
25
-50
869 MHz
880 MHz
894 MHz
869 MHz
880 MHz
894 MHz
-45
-50
-55
-60
-65
20
15
10
5
-55
-60
-65
-70
-75
IMD3L
30
IMD3U
32
IMD5
0
26
28
34
36
22
24
26
28
30
32
22
24
26
28
30
32
Average Output Power (dBm)
Output Power, PEP (dBm)
Average Output Power (dBm)
Unconditionally stable circuit version of this application circuit is available for download off of the website at: http://www.wj.com
Specifications and information are subject to change without notice
Page 4 of 14 May 2007 ver 1
WJ Communications, Inc • Phone 1-800-WJ1-4401 • FAX: 408-577-6621 • e-mail: sales@wj.com • Web site: www.wj.com
WJCI [ WJ COMMUNICATION. INC. ]
