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WS2512 Schematic ( PDF Datasheet ) - Agilent

Teilenummer WS2512
Beschreibung 4 x 4 Power Amplifier Module
Hersteller Agilent
Logo Agilent Logo 




Gesamt 20 Seiten
WS2512 Datasheet, Funktion
Agilent WS2512
4 x 4 Power Amplifier Module
for UMTS2100 (1920 – 1980 MHz)
Data Sheet
Description
The WS2512, a Wide-band Code
Division Multiple Access
(WCDMA) Power Amplifier (PA),
is a fully matched 10-pin surface
mount module developed for
WCDMA handset applications.
This power amplifier module
operates in the 1920 – 1980 MHz
bandwidth. The WS2512 meets
the stringent WCDMA linearity
requirements for output power of
up to 28 dBm. A low current
(Vcont) pin is provided for high
efficiency improvement of the
low output power range.
The WS2512 features CoolPAM
Circuit technology offering state-
of-the-art reliability, temperature
stability and ruggedness.
The WS2512 is self contained,
incorporating 50ohm input and
output matching networks.
Features
• CoolPAM circuit technology
• Good linearity
• High efficiency
• 10-pin surface mounting package
(4 mm x 4 mm x 1.4 mm)
• Low power-state control
• Low quiescent current
• Internal 50matching networks
for both RF input and output
Applications
• W-CDMA handsets
• HSDPA handsets
Functional Block Diagram
Vcc2(10)
RF Input (2)
Input
Match
DA
Inter
Stage
Match
PA
Vcc1 (1)
MMIC
Bias Circuit & Control Logic
Vcont(4)
Vref(5)
Output
Match
RF Output (8)
MODULE






WS2512 Datasheet, Funktion
Characteristics Data (WCDMA, Control scheme: 3-mode control, Vcc = 3.4V, Vref = 2.85V, T = 25°C,
Fo =1950 MHz)
500
450
400
350
300
250
200
150
100
50
0
-10
-5
0
5 10 15 20 25 30
Pout (dBm)
Figure 6. Total Current vs. Output Power.
30
25
20
15
10
5
0
-10 -5 0 5 10 15 20 25 30
Pout (dBm)
Figure 7. Gain vs. Output Power.
45
40
35
30
25
20
15
10
5
0
-10 -5 0 5 10 15 20 25
Pout (dBm)
Figure 8. Power Added Efficiency vs. Output Power.
30
-30
-35
-40
-45
-50
-55
-60
-10 -5
0
5 10 15 20 25 30
Pout (dBm)
Figure 9. Adjacent Channel Leakage Ratio 1 vs. Output Power.
-40
-45
-50
-55
-60
-65
-70
-10 -5
0
5 10 15 20 25 30
Pout (dBm)
Figure 10. Adjacent Channel Leakage Ratio 2 vs. Output Power.
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WS2512 pdf, datenblatt
Calibration
Calibration procedure is shown
in Figure 22. CoolPAM requires
two calibration tables for high
mode and low mode respectively.
This is due to gain difference in
each mode.
For continuous output power at
the points of mode change, the
input power should be adjusted
according to gain step during the
mode change.
Offset Value
(difference between
rising point and falling point)
Offset value, which is the differ-
ence between the rising point
(output power where PA mode
changes from low mode to high
mode) and falling point (output
power where PA mode changes
from high mode to low mode),
should be set to prevent system
oscillation. 3 to 5 dB is recom-
mended for Hysteresis.
Average Current & Talk Time
Probability Distribution Func-
tion implies that what is impor-
tant for longer talk time is the
efficiency of low or medium
power range rather than the
efficiency at full power. WS2512
idle current is 13 mA and operat-
ing current at 16 dBm is 54 mA
at nominal condition. Average
current calculated with CDMA
PDF is 26 mA in urban area and
43 mA in suburban area for
2-mode control. Average current
can be reduced with 3-mode
control, which results in 20 mA
in urban area and 38 mA in
suburban area. This PA with low
current consumption prolongs
talk time by no less than 30
minutes compared to other PAs.
Average current = (PDF x Current)dp
TX AGC
Gain
Low mode
High mode
Min PWR
Falling Rising
Pout
Max PWR
Figure 22. Calibration procedure.
Low Mode
High Mode
Falling
Rising
Pout
Figure 23. Setting of offset between rising and
falling power.
5.00
4.50
4.00
3.50
3.00
2.50
2.00
1.50
1.00
0.50
0.00
-50
CDG Urban
CDG Suburban
-40 -30 -20 -10
0
PA Out (dBm)
10
Conv PAM
Digitally Controlled PAM
Figure 24. CDMA Power Distribution Function.
700
600
500
400
300
200
100
0
20 30
Cool PAM
12

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