PMB-2240 Siemens, PMB-2240 Datasheet - Page 26

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

The LO level for maximum SSB suppression can be tuned to every value within its operational range (
-15 dBm to 0 dBm ) by appropriate choice of ROFF1/ROFF2.
At pins OFF1 and OFF2 always a resistor or a short cicuit to ground is required. The recommended
range of values is:
0 > ROFF1,ROFF2 < 600 Ohm.
In fig. 1 the maximum single sideband suppression (a ssb ) is tuned to -7dBm LO input power
accordinng test circuit 1. ROFF1=0 and ROFF2=200 Ohms.
The LO level can vary +/- 4dB around its optimum value with assb < -35dB.
Phase adjust with ROFF1=short, ROFF2=200 Ohms
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Siemens AG
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