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| 型號(hào)： | PMB2240 |
| 廠商： | SIEMENS A G |
| 元件分類： | 無(wú)繩電話/電話 |
| 英文描述： | GSM-Transmitter |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PQFP48 |
| 封裝： | PLASTIC, TQFP-48 |
| 文件頁(yè)數(shù)： | 26/31頁(yè) |
| 文件大小： | 1663K |
| 代理商： | PMB2240 |
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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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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 (assb) 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.
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Phase adjust with ROFF1=short, ROFF2=200 Ohms
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