915 MHz MIXER

Pls I have this project to work on and I don't have a circuit diagram to implement it. Pls I need help cos time is running out. I have rather broken it down to its constituent block diagram
1. Local Oscillator to generate the carrier
2. A frequency multiplier in case I cannot get a single oscillator up to the GSM
band frequency
3. The mixer implemented with double balanced diode
4. then the filters at the input and output ports...

The mixer takes an IF input, mixes with a local oscillator signal and produces an Rf output in tha GSM band 915 MHz


Pls I really need help either with the whole working circuit or individual circuits for the various components as broken down