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5 

 

2.2

 

2.2.1

 

u

1

x

2

x

1

f(x

1

...x

n

)

u

1

x

2

x

1

f(x

1

...x

n

)

The principle diagram amplifier

 

2.2.2

 

Mainly by 850 M amplifier and 1900 M two amplifier module

，

The distribution of the method of frequency by 

close to complete

。

First downside (BTS) signals through the OUTDOOR antenna into the method of close

，

Close to 850 M and PCS1900M method of two signals to choose apart

，

And then sent into the corresponding 

amplifier module will ampli

。

 

Signals into the amplifier module

，

First after duplex device

，

Downlink signal to choose filter

，

Enter LNA (low 

noise amplifier) preliminary amplification

，

And then after surface acoustic filter filter

，

Enter UP_PA (downside 

power amplifier) to signal further amplification

。

After double work of choice is again after filtering

，

Enter and 

method, and then through the heavy start antenna launch out 

。