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參數資料
| 型號： | CX77141 |
| 英文描述： | CX77141: Product Summary|PA Modules for WCDMA Handsets |
| 中文描述： | CX77141：產品概要|功率放大器WCDMA手機模塊 |
| 文件頁數： | 12/16頁 |
| 文件大?。?/td> | 246K |
| 代理商： | CX77141 |
Typical System Design Implementation
77129
System Smart PA Module for CDMA / AMPS (824–849 MHz)
12
Conexant
101384A
May 14, 2002
Typical System Design Implementation
Figure 12
shows the CX77129 interface to baseband logic and transmit chain in a typical handset.
Since CX77129 uses two CMOS logic level power control pins, two pull-up resistors are required.
Another CMOS logic pin (PA_ON) can be used to enable / disable the CX77129. A NPN bipolar
transistor and P-Channel P-FET are used to supply VREF to the CX77129. In order to provide a
consistent voltage with adequate current from the Low Drop-Out voltage regulator, a low
on-resistance P-FET is required.
The following steps are used to power up the CX77129 module.
1.
2.
Connect Vcc to a 3.4 V DC power supply, then turn on the supply.
Connect Vref to a 3.0 V DC power supply, then turn on the supply.
For High Power mode (up to 28dBm), apply
HIGH to
VCONT1 and
VCONT2.
For Medium Power, Low Power, and Shutdown modes, refer to
Table 3
.
Apply RF signal.
3.
4.
5.
Figure 12. Interconnect Schematic
101059_005
Baseband
Signal
Processor
and
Control Logic
UpConverter/
Driver
PA_ON
PA_ON
I/Q DACs
PA_R0
PA_R1
VDD
VDD
V
BATTERY
+
–
V
CONT1
V
CONT2
GND
V
CC1
, V
CC2
V
REF
SAW
Filter
CDMA
RFIN
RFOUT
LDO Regulator
CX77129
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