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| 型號(hào)： | PCF5079 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Dual-band power amplifier controller for GSM, PCN and DCS |
| 中文描述： | 雙頻功率的GSM，PCN和DCS放大器控制器 |
| 文件頁(yè)數(shù)： | 17/28頁(yè) |
| 文件大?。?/td> | 146K |
| 代理商： | PCF5079 |
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2001 Nov 21
17
Philips Semiconductors
Product specification
Dual-band power amplifier controller for
GSM, PCN and DCS
PCF5079
12.2
PA protection against mismatch
High VSWR at the PA output may occur in systems where
the PA is connected to the antenna via couplers and
switcheswithlowinsertionloss,dependingontheantenna
matching. The incident and reflected power have to be
monitored and care has to be taken to prevent the
summed RF power does not exceed the defined maximum
value at the PA output.
As two sensor inputs are available in the PCF5079, two
different detector signals can be combined: one for direct
path and one for reflected path. These two voltages, fed to
the sensor inputs, are summed inside the PCF5079
resultinginadecreaseinthePA outputpowerifthereisan
increase of the VSWR at the antenna port (see Fig.15).
handbook, full pagewidth
MGT330
PA
band select
switch
D1
D2
C1
VS1
C2
VS2
R2
R1
RFin HB
RFout
RFin LB
broad band
coupler
Fig.15 Example of PA mismatch protection circuit.
Table 3
Table of components (see Fig.15)
SYMBOL
COMPONENT
DESCRIPTION
D1, D2
R1, R2
C1, C2
detector diode
resistor
capacitor
band select switch
Philips 1PS79SB62
R = 1 k
(decoupling versions)
C = 39 pF
Motorola; Alpha Industries; M/A; COM GaAs MMIC; or discrete pin diode,
e.g. Philips BAP51-03
Murata LCD20 series; TDK HHM 20, 22 series
broad band coupler
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