Eric.Wilson

4-9-13 -- Here are some useful links to mixers that I found (The second link may be more useful):

http://www.mhprofessional.com/downloads/products/0071544526/SayreCh07.pdf

http://www.qsl.net/va3iul/RF%20Mixers/RF_Mixers.pdf

Other useful information:

SDR design

A good article on noise figure

Noise Figure of Passive Devices

Noise Figure and SNR

Understanding Noise Figure

On Noise Figures and Noise Temperatures