Hi
I have a optical reciever which down converts activity of 0-8Khz occured over THz light signal to to RF Signal of frequency 200MHz and the signal of interest would lie arround the 200Mhz Signal

How can we down convert the 8Khz signal using a analog down converter ICs
I am naive to RF and Radar but i assume RADAR, RF engineering is advanced to extract signal using super hetrodyne recivers already
Can TI please suggest me any way to address this problem statement?