WS1102 datasheet(9/16 Pages) AVAGO

9 / 16 page

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

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

Pout

Min PWR

Max PWR

High mode

TX AGC

Low mode

Rising

Falling

Rising

Falling

High Mode

Low Mode

Pout

Gain

Figure11.Calibrationprocedure.

Figure12.Settingofoffsetbetweenrisingandfallingpower.

Figure13.CDMAPowerDistributionFunction.

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

5.00

-50

-40

-30

-20

-10

PA Out (dBm)

CDG Urban

CDG Suburban

Conv PAM

Digitally Controlled PAM

Cool PAM

100

200

300

500

400

600

700

WS1102 Datasheet(PDF) 9 Page - AVAGO TECHNOLOGIES LIMITED

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