參數(shù)資料
型號(hào)： EVB3020A
英文描述： GSM Multiband RF Transceiver
中文描述： 手機(jī)多頻段射頻收發(fā)器
文件頁(yè)數(shù)： 17/44頁(yè)
文件大?。?/td> 409K
代理商： EVB3020A
Advance Data Sheet
W3020 GSM Multiband RF Transceiver
December 1999
24
Lucent Technologies Inc.
Programming Information (continued)
TR Register (continued)
Table 20. FTR: LPF Tune Filter Request
This requests tuning operation of baseband low-pass
filter (see the Low-Pass Filter Tuning section for
details). If the filter tune is enabled in CONFIG
register, the FTR bit must be programmed high before
the first following receive mode is active. Filter tune
can only be done in a mode where LO2 is active, e.g.,
receive mode.
FTR
Bit 15
Function
0
Use Default Tuning Value
1
Perform New Tuning
Table 21. DP: dc Precharge Only
When dc offset calibration is performed, only the
precharge portion is done. This reduces the amount of
time required for dc offset calibration, but gives higher
levels of dc offset. (See the dc Offset Calibration
section for details.)
DP
Bit 14
Function
0
Standard dc Offset Correction Cycle
1
dc Precharge Cycle Only
Table 22. DS: dc Correction Skip
DS
Bit 13
Function
0
Insert dc Correction Cycle (See Table
41.)
1
Skip dc Offset Calibration (with retained
dc correction setting)
Table 23. T2: TX IF LO Division Select Switch
Reverses the LO2 frequency division factor in the
transmitter for both bands. This is provided for testing
purposes. This bit works with the band bit B as follows.
T2
Bit 12
B
Bit 23
Function
0
Divide by 2 (270 MHz):
Normal GSM900 Division
0
1
Divide by 3 (180 MHz): Normal
GSM1800/1900 Division
1
0
Divide by 3 (180 MHz): Reversed
Band 0 Division
1
Divide by 2 (270 MHz): Reversed
Band 1 Division
Table 24. T1: TX IF LO Divide-by-6 Select
This bit will change the divide-by-3 circuit to a divide-
by-6 circuit. This bit is provided for testing purposes.
T1
Bit 11
Function
0
Divide by 3 when 1/3 Path Is Active
1
Divide by 6 when 1/3 Path Is Active
Table 25. T0: TX IF Duty Cycle Corrector Disable
When high, disables duty cycle correction circuit into
the transmit IF phase splitter. This bit is provided for
testing purposes.
T0
Bit 10
Function
0
TX IF LO Duty Cycle Corrector Enabled
1
TX IF LO Duty Cycle Corrector Disabled
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