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Designing the dc biasing circuit of LNA

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adnan siddqui

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I am a beginner and want to design LNA of the frequency 2100 Mhz.Plese help me to design the dc biasing circuit for the bipolar transistor which also isolate the RF and dc biasing
 

you can refer to the transistor's datasheet and its application note which locates in the manufacturer's webaddress. good luck!!!
 

Hi,

You should search in the AMW (Applied Microwave and Wireless), MWRF (Microwave and RF), MPD (Microwave Product Digest) RF Design archives.
Some of their webpage contain download section.

Also the chip and transistor manufacturers usually have a bunch of appnotes on their sites.

For example (practical appnote from Infineon):

**broken link removed**

And there are a lot of others.

best regards, Al
 

You can refer attached paper using lumped element as biasing instead of radial stub
 

you can use ads2003 ,it have guide.
 

AL0117 said:
Hi,

You should search in the AMW (Applied Microwave and Wireless), MWRF (Microwave and RF), MPD (Microwave Product Digest) RF Design archives.
Some of their webpage contain download section.

Also the chip and transistor manufacturers usually have a bunch of appnotes on their sites.

For example (practical appnote from Infineon):

**broken link removed**

And there are a lot of others.

best regards, Al
Click to expand...

hi AL0117:
AMW'archives are not free...can u share some free app. notes about RF/Microwave power amplifiers ?
thanx alt~~~~~~~~~`
 

try active bias circuit, it is more stable voltage for temperature change.
 

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