AWR1843BOOST: Radio processor sub-system

Ok...., No issues..., So TI is taking zero IF of both I and Q to the ADCs right...?

Hai...

I am wondering if we do I and Q , i.e adding phase of 90 degree, will it affect the doppler FFT

Hello Rehman,

I am unable to understand what you have asked, can you please provide more details?

a) What do you mean by 0 IF

b) Are you planning to apply phase shift on the Tx signal of 90 degrees? Then both I and Q will be shifted by 90 degrees due to which doppler will also have an effective 90 degrees shift.

Regards,
Saswat Kumar

Hai Saswat,

a) In the receiver side,  the mixers LOs you are taking from the chirp synthesizer right and the RFs from resp. RX antenna...the received IF is termed 0 IF because at LO and RF frequency are same.....

B) No...we are planning to do phase shift at receiver side only.......so in your single RX channel you are using a power divider which will be given to RF of 2 mixers and LO of 1 mixer will be from chirp synthesizer( which will give I IF ) and other from 90degree phase shifted chirp synthesizer( which will give Q IF ) right...?

Regard,

Rehman

But in the Functional Block Diagram of AWR1843 I am not seeing any phase shifting done in RX path.....then how are TI able to get  I and Q IFs.