ATF-521P8 Avago Technologies, ATF-521P8 Datasheet - Page 19

• Manufacturer Part Number: ATF-521P8
• Description: Atf-521p8 Gaas Field Effect
• Manufacturer: Avago Technologies

19
Figure 15. Gain and Noise Figure vs. Frequency.
Input and output return loss are both greater that 10 dB.
Although somewhat narrowband, the response is ad‑
equate in the frequency range of 2110 MHz to 2170 MHz
for the WCDMA downlink. If wider band response is
need, using a balanced configuration improves return
loss and doubles OIP3.
Figure 16. Input and Output Return Loss vs. Frequency.
Perhaps the most critical system level specification for
the ATF‑521P8 lies in its distortion‑less output power.
Typically, amplifiers are characterized for linearity by
measuring OIP3. This is a two‑tone harmonic measure‑
ment using CW signals. But because WCDMA is a modu‑
lated waveform spread across 3.84 MHz, it is difficult
to correlated good OIP3 to good ACLR. Thus, both are
measured and presented to avoid ambiguity.
Figure 15. Gain and Noise Figure vs.
Frequency.
Figure 16. Input and Output Return Loss vs.
Frequency.
20
15
10
-10
-15
5
0
1.6
-5
0
1.6
1.8
1.8
FREQUENCY (GHz)
FREQUENCY (GHz)
2.0
2.0
2.2
2.2
Gain
S11
S22
NF
2.4
2.4
2.6
2.6
Figure 17. OIP3 vs. Frequency in WCDMA Band (Pout = 12 dBm).
Figure 18. ACLR vs. Pout at 5 MHz Offset.
C1=1.2 pF
C2,C8=1.5 pF Phycomp 0402CG159C9B200
C3=4.7 pF
C4,C6=.1 µF
C5=1 µF
C7=150 pF
L1=1.0 nH
L2=12 nH
L3=39 nH
L4=3.9 nH
R1=49.9Ω
R2=383Ω
R3=2.37Ω
R4=61.9Ω
R5=10Ω
R6=1.2Ω
Q1, Q2
J1, J2
Table 2. 2140 MHz Bill of Material.
Figure 17. OIP3 vs. Frequency in WCDMA
Band (Pout = 12 dBm).
Figure 18. ACLR vs. Pout at 5 MHz Offset.
-30
-35
-40
-45
-50
-55
-60
-65
45
40
35
30
25
2060
-3
2080
2
2100
FREQUENCY (MHz)
Phycomp 0402CG129C9B200
Phycomp 0402CG479C9B200
Phycomp 06032F104M8B200
AVX 0805ZC105KATZA
Phycomp 0402CG151J9B200
TOKO LL1005‑FH1n0S
TOKO LL1005‑FS12N
TOKO LL1005‑FS39
TOKO LL1005‑FH3N9S
RohmRK73H1J49R9F
Rohm RK73H1J3830F
Rohm RK73H1J2R37F
Rohm RK73H1J61R9F
Rohm RK73H1J10R0F
Rohm RK73H1J1R21F
Philips BCV62B
142‑0701‑851
Pout (dBm)
2120 2140
7
12
2160 2180
17
2200
22