Module 17: Heterodyne Receiver -and Image Rejection

[@ammarahmad1269]

Very well explained, thank you.

[@MichiganMaker]

Finally, I understand. Subscribed. Thank you.

[@osklibo7884]

good explanation thank you!

[@microreniassance2929]

Great!! Now I understand, at least, somewhat, what the freakin' "image" signal is!

[@lechang4183]

Gracias Prof~

[@EL-iu8rc]

good, thank you

[@zhengguosun2962]

thank you for the lecture. one thing i don't quite get is the absolute bandwidth of the BAND PASS filter. why is the absolute bandwidth of BPF is directly related to the filter's distance from the base-band? also, could you explain what is the absolute bandwidth? I tried to google its concept, end up in vain. thank you so much

[@DuyNguyen-xb7gf]

Learn about q-factor

[@kervinsingh6213]

from wikipedia page: en.wikipedia.org/wiki/Superheterodyne_receiver#IF_bandpass_filter "First, it is easier and less expensive to get high selectivity at a lower frequency. For the same bandwidth, a tuned circuit at a lower frequency needs a lower Q. Stated another way, for the same filter technology, a higher center frequency will take more IF filter stages to achieve the same selectivity bandwidth. "

[@zaikenv]

@@DuyNguyen-xb7gf I don't see how it applies...

[@mcie6306]

Thinks sir , this is great

[@nickpenacl_]

Well done

[@yeli9870]

2:37 Hi professor, does very low intermediate frequency in heterodyne detection mean it is basically homodyne detection?

[@abdelkaderalicherif6439]

than you

[@martinmulligan4327]

Your going to need some very high order Image rejection filter