Q2406D datasheet(13/81 Pages) ETC

13 / 81 page

WM_PRJ_Q2400_PTS_002 - 002

24th January 2003

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without prior written agreement.

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2.2 Power supply

2.2.1 Power supply description

The power supply is one of the key issue in the design of a GSM terminal. Due

to the bursted emission in GSM / GPRS, the power supply must be able to

deliver high current peaks in a short time. During these peaks the ripple (Uripp)

and the drop (Udrop) on the supply voltage must not exceed a certain limit (see

table “Power Supply Voltage” bellow).

•

In communication mode, a GSM/GPRS classe 2 terminal emits 577µs

radio bursts every 4.615ms.

Uripp

Udrop

Uripp

Udrop

T = 4,615 ms

t = 577 µs

In communication mode, a GPRS class 10 terminal emits 1154µs radio bursts

every 4.615ms.

Two different inputs are provided for the power supply. The first one, VBATT is

used to supply the RF part and VDD, the second one is used to supply the

baseband part.

Notes :

•

It is possible to connect VBATT to VDD.

•

In case of separate power supplies, they have to be in the same state i.e

both active or inactive at the same time.

VBATT : supplies directly the RF components with 3,6 V. It is essential to keep

a minimum voltage ripple at this connection in order to avoid any phase error.

The RF Power Amplifier current (2.0 A peak in GSM /GPRS mode) flows with a

ratio of 1/8 of the time (around 577µs every 4.615ms for GSM /GPRS cl 2) and

2/8 of the time (around 1154µs every 4.615ms for GSM /GPRS cl 10). The

rising time is around 10µs.

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