WS1102-BLK Avago Technologies US Inc., WS1102-BLK Datasheet - Page 9

• Manufacturer Part Number: WS1102-BLK
• Description: MODULE PA CDMA/AMPS 824-849MHZ
• Manufacturer: Avago Technologies US Inc.
• Type: Power Amplifierr

Specifications of WS1102-BLK

• Current - Supply: 460mA
• Frequency: 824MHz ~ 849MHz
• Gain: 28.5dB
• Package / Case: 8-SMD, No Leads
• Rf Type: CDMA, AMPS
• Voltage - Supply: 3.2 V ~ 4.2 V
• Operating Frequency: 849 MHz
• Supply Current: 500 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 30 C
• Number Of Channels: 1 Channel
• Frequency (max): 849MHz
• Power Supply Requirement: Single
• Single Supply Voltage (min): 3.2V
• Single Supply Voltage (typ): 3.4V
• Single Supply Voltage (max): 4.2V
• Package Type: SMD
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temperature Classification: Commercial
• Operating Temp Range: -30C to 85C
• Pin Count: 8
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Noise Figure: -
• P1db: -
• Test Frequency: -
• Lead Free Status / Rohs Status: Compliant


Calibration
Calibration procedure is shown in Figure 11. Two
calibration tables, high mode and low mode respectively,
are required for CoolPAM, which is due to gain difference
in each mode.
For continuous output power at the mode change points,
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 difference between the rising
point (output power where PA mode changes from low
mode to high mode) and falling point (output power
Figure 11. Calibration procedure.
Min PWR
TX AGC
Low mode
Falling
Rising
5.00
4.50
4.00
3.50
3.00
2.50
2.00
1.50
1.00
0.50
0.00
High mode
-50
Conv PAM
Max PWR
-40
Pout
CDG Urban
CDG Suburban
Figure 13. CDMA Power Distribution Function.
-30
-20
Digitally Controlled PAM
PA Out (dBm)
-10
Gain
where PA mode changes from high mode to low mode),
should be adopted to prevent system oscillation. 3 to 5
dB is recommended for Hysteresis.
Average Current and Talk Time
Probability Distribution Function implies that what is
important for longer talk time is the efficiency of low
or medium power range rather than the efficiency at
full power. WS1102 idle current is 14 mA and operating
current at 16 dBm is 60 mA at nominal condition.
Average current calculated with CDMA PDF is 33 mA in
urban area and 54 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
Figure 12. Setting of offset between rising and falling power.
Low Mode
0
Falling
10
20
Rising
Cool PAM
High Mode
30
100
300
700
600
500
400
200
0
Pout