can anybody explain me the design steps for an RF mixer

1. Design start from the specifications: convertion gain, noise figure, IP3, current consumption, ...
2. Select mixer circuit type: passive (diode,...), active (Gillbert cell, ...), single balanced, double balanced, ...
3. Circuit design: CMOS, BJT, ...
DC: bias, current, ...
AC: gain, NF, IP3, ...

This is my experience, just for reference.