PMB-2240 Siemens, PMB-2240 Datasheet - Page 9

• Manufacturer Part Number: PMB-2240
• Description: GSM Transmitter
• Manufacturer: Siemens

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.
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Siemens AG
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