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WS2111 Schematic ( PDF Datasheet ) - Agilent

Teilenummer WS2111
Beschreibung 4 x 4 Power Amplifier Module
Hersteller Agilent
Logo Agilent Logo 




Gesamt 20 Seiten
WS2111 Datasheet, Funktion
Agilent WS2111
4 x 4 Power Amplifier Module
for UMTS850 (824 – 849 MHz)
Data Sheet
Description
The WS2111, 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 824–849 MHz
bandwidth. The WS2111 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 WS2111 features CoolPAM
Circuit technology offering state-
of-the-art reliability, temperature
stability and ruggedness.
The WS2111 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
• Internal 50matching networks
for both RF input and output
• Low quiescent current
Applications
• W-CDMA Handsets
• HSDPA Handsets
Functional Block Diagram
Vcc2(6)
RF Input (4)
Input
Match
DA
Inter
Stage
Match
PA
Vcc1 (5)
MMIC
Bias Circuit & Control Logic
Vcont(2)
Vref(1)
Output
Match
RF Output (8)
MODULE






WS2111 Datasheet, Funktion
Characterization Data (WCDMA, Control scheme: 3-mode control, Vcc = 3.4V, Vref = 2.85V, T = 25°C, Fo = 837 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.
50
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
-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.
30
25
20
15
10
5
0
-10 -5 0 5 10 15 20 25 30
Pout (dBm)
Figure 7. Gain vs. Output Power.
-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.
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WS2111 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 and Talk Time
Probability Distribution Function
implies that what is important
for longer talk time is the effi-
ciency of low or medium power
range rather than the efficiency
at full power. WS2111 idle
current is 14 mA and operating
current at 16 dBm is 56 mA at
nominal condition. Average
current calculated with CDMA
PDF is 31 mA in urban area and
48 mA in suburban area for 2-
mode control. Average current
can be reduced with 3-mode
control, which results in 24 mA
in urban area and 42 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
700
600
500
400
300
200
100
0
20 30
Cool PAM
Figure 24. CDMA Power Distribution Function.
12

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