參數(shù)資料
型號(hào): CXG1121TN
廠商: Sony Corporation
英文描述: SP4T GSM/GPRS Dual-Band Antenna Switch + Logic
中文描述: SP4T的GSM / GPRS雙頻天線開(kāi)關(guān)邏輯
文件頁(yè)數(shù): 5/7頁(yè)
文件大?。?/td> 62K
代理商: CXG1121TN
5
CXG1121TN
Application Note (1)
Operating from Regulated Supplies between 3V and 2.7V
CXG1121TN
Logic Lines
Tx1
ANT
Tx2
Rx1
Rx2
V
DD
2
4
6
8
11
C
1
D
R
Timeslot
waveform
Regulated supply
between 3V and 2.7V
V
DD
between
5.7V and 4.5V
during Tx
Additional components
C: 0603 CAP μF
2
R: 200R
D: Low Turn-on voltage diode
13
Technique
Allows use of CXG1121TN SP4T in handsets with regulated supplies between 3V and 2.7V.
The CXG1121TN is for 5V nominal battery voltage but works well down to a V
DD
of 4.5V.
This technique is only necessary for Tx modes.
Fundamentally, the timeslot waveform is added to the supply voltage to give a V
DD
between 5.7V and 4.5V
(depending on supply) during Tx modes.
This technique is suitable for up to 4 consecutive Tx timeslots (i.e.GPRS Class 12).
1
This waveform may be taken from the PA ramping input (or drain supply in case of drain power control) or
via the Tx ON/OFF logic.
2
Minimum and recommended value of capacitance C depends on GPRS class and is given by the following
table.
Number of consecutive
Tx timeslots
1
Minimum and recommended
value of capacitance C (μF)
1.0
2
4
2.0
2.0
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