Does GSM allow capacitor coupling?

[dd2001]

Hi, everyone

Does GSM transceiver allow to use cap coupling between following stages?

LNA->Mixer_RF->VGA->Mixer_IF->BB_Filter (receiver)

BB_Filter->Mixer_IF->Mixer->RF->pre_PA (Transmitter)


Anyone knows? Or have to be DC coupling for all stages?


Thanks a lot!

 

[mckinson]

yeah,because the frequency of VCO radio,and receive from antanne, via mixing with the VCO. produce the DC partion . So we have to add DC coupling capcitor.

 

[panzerV]

Yes,you may use cap beteween the BB and IF.

 

[gladiator]

Hi
What is the advantages of using the coupling cap?

 

[Ricky761]

The advantage of using a coupling capacitor between circuit stages is that you are not constrained with the dc voltage difference between them but of course it introduce also loses specially in the higher band of frequency.