PCF5079T Просмотр технического описания (PDF) - Philips Electronics

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PCF5079T

Dual-band power amplifier controller for GSM, PCN and DCS

Philips Electronics 

Philips Semiconductors

Dual-band power amplifier controller for

GSM, PCN and DCS

12 APPLICATION INFORMATION

Product specification

PCF5079

handbook, full pagewidth

RFout

(dBc)

0

−10

−20

−30

−40

−50

−60

−70

−80

VVDAC

typ <0.9VDD

of PCF5073x

CODE KICK

CODE START

VVCD, VVCG

typ >0.85VDD

with RL = 350 Ω

PA conduction

threshold

−28

−18 −10

0

+543

+553 +561

+571 time (µs)

CODE END

CODE START (1)

0 2 4 6 8 10 12 14 16

16 + n 20 + n 24 + n 28 + n 32+ n

18+ n 22 + n 26 + n 30 + n

nx (2 × QB)

time (2 × QB)

Vprebias

APEDAC3

(PCF5073x)

PU

(PCF5079)

RFin

0 2 4 6 8 10 12 14 16

16 + n 20 + n 24 + n 28 + n 32 + n

18+ n 22 + n 26 + n 30 + n

nx (2 × QB)

time (2 × QB)

time

time

>20 µs

tA(2)

<1 µs

time

MGT329

(1) The software design must guarantee that CODESTART is applied before the PU transition from logic 0 to logic 1.

(2) The exact duration of tA depends on both PCF5079 and the application loop characteristics. The duration should be long enough to ensure that

VVCD, VVCG is below the PA conduction threshold. The contribution of PCF5079 is mainly due to the group delay of the low-pass filter on the VDAC

input (see Fig.11).

Fig.12 Timing diagram for one time slot with PCF5073x family.

2001 Nov 21

15

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