Wavecom WISMO Quik Q2406 Customer Design Manuallines
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WM_PRJ_Q2400_PTS_005 -00718th January 2006Confidential©All rights reservedPage: 11 / 51This document is the sole and exclusive property of WAVECOM. Not to bedistributed or divulged without prior written agreement.2 Baseband DesignNote:Some of the WISMO interface signals are multiplexed in order to limit number ofpins but this architecture implies some limitation.For example in case of using SPI bus, 2-wire bus can not be used.) Warning:All external signals must be inactive when the WISMO module is OFF to avoidany damage when starting and allow WISMO module to start correctly.2.1 Power supply and ground design rules2.1.1 Electrical constraintsThe power supply is one of the key issues in the design of a GSM terminal. Dueto the bursted emission in GSM / GPRS, the power supply must be able todeliver high current peaks in a short time and assured that the voltage deliveredto the module remains always under the limits specified in the table “Maximumvoltage ripple (Uripp) vs Frequency in GSM & DCS” hereafter, specially duringburst while there is a drop of voltage (see Figure 1).In communication mode, a GSM/GPRS class 2 terminal emits 577 μs radio burstsevery 4.615 ms.In communication mode, a GPRS class 10 terminal emits 1154 μs radio burstsevery 4.615 ms.Uripp UrippT = 4.615 mst = 577 μsVBATT (1)IBATT(1) or VDD if connected to VBATTVmaxVminFigure 1: Typical power supply voltage in GSM modeTwo different inputs are provided for the power supply:• the first one, VBATT is used to supply the RF part,• the second one, VDD is used to supply the baseband part.The power supply voltage features given in the table hereafter will guaranteenominal functioning of the module. |
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