PMB2240 Ver la hoja de datos (PDF) - Siemens AG

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PMB2240

GSM-Transmitter

Siemens AG 

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There are four independent supply voltages ( VCC1-3,VCCPR ) and ground rails ( GND1-4 ) to

decouple the modulator/mixer parts, the synthesizer parts, and the RFVCO parts.

The supply pin VCCPR is a separate prescaler supply, which openes the possilility to run the prescaler

together with the rest of the RF synthesizer on a supply voltage that is different from the supplies of the

rest of the chip

GND4 is a special shielding ground to decrease crosstalk between the separately supplied blocks.

GND5 collects the substrate contacts in the modulator and mixer.

It is recommended to connect all GND pins to a common GND on the board.

In the following figure the chip schematic is partitioned according to its supply rails.

The reproduction, transmission or use of this document is not permitted without express written authority. Offenders will be liable for damages. All

rights, including rights created by patent grant or registration of a utility model or design, are reserved.

Siemens AG

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