Mixer Design for RF Transmitter

Hi, I am supposed to design a transmitter for my project. I have already pretty much finished the VCO and Power Amplifier and now need to build the Mixer. My professor said a Passive Quad-FET would be a good architecture to build. But I am confused on how the schematic for this looks. I keep finding different circuits that contradict one another. If anyone could show me a basic schematic and give me some tips how to design it for good Image Rejection Ratio, LO to RF Leakage, and OIP3, that would be great. Also, anyone that can help me with how to set up the simulation in Cadence would be greatly appreciated. Thanks!

What range of input and output frequencies do you want it to work over?

At page 15 I found a good description of the quad FET passive mixer:
http://www.qsl.net/va3iul/RF%20Mixers/RF_Mixers.pdf