Mixer: Small IF frequency vs LO/RF
Mixer: Small IF frequency vs LO/RF
(OP)
Hi,
I am designing an FMCW-GPR. My question is about the mixer. We are hoping to keep the IF very low (~10kHz) to make ADC easier, but our LO freq and RF must be ~1.5GHz. The mixer we want to buy does spec the IF as DC-1GHz, but I worry that there will be an issue having the IF so much smaller than the LO/RF. Any advice?
Thanks in advance.
I am designing an FMCW-GPR. My question is about the mixer. We are hoping to keep the IF very low (~10kHz) to make ADC easier, but our LO freq and RF must be ~1.5GHz. The mixer we want to buy does spec the IF as DC-1GHz, but I worry that there will be an issue having the IF so much smaller than the LO/RF. Any advice?
Thanks in advance.





RE: Mixer: Small IF frequency vs LO/RF
www.MaguffinMicrowave.com
Maguffin Microwave wireless design consulting
RE: Mixer: Small IF frequency vs LO/RF
www.MaguffinMicrowave.com
Maguffin Microwave wireless design consulting
RE: Mixer: Small IF frequency vs LO/RF
RE: Mixer: Small IF frequency vs LO/RF
VE1BLL: We are shooting for around 1-5cm depth resolution, not really sure what's going to be realistic though. The 10kHz is order of magnitude, because our ADC samples at a max of 100kHz.
RE: Mixer: Small IF frequency vs LO/RF
RE: Mixer: Small IF frequency vs LO/RF
Last time I checked light was still moving 300 microns/picosecond around here.
John D
RE: Mixer: Small IF frequency vs LO/RF
RE: Mixer: Small IF frequency vs LO/RF
Thanks for the tips everyone.
RE: Mixer: Small IF frequency vs LO/RF
www.MaguffinMicrowave.com
Maguffin Microwave wireless design consulting
RE: Mixer: Small IF frequency vs LO/RF
But I admit that "FMCW" is exactly what I overlooked with my first two responses. I was thinking in the Time domain, not the Frequency domain. 'My bad.'