How to double a LO signal in UHF band

[air2008]

hi,

I want to use quadrature demodulator ad8348 to make a receiver. It requests that the LO frequency be twice of that of the input RF (or IF) signal. Now, the original LO signal is ready (e.g. 700MHz). How can I double this LO signal to 1400MHz?



Please help me.

 

[khouly]

use frequency double , it is like class C amplifier , at the output there will be the harmonics of the signal , the output matching network designed like a filter to select the second harmonic

check nonlinear Rf and microwave circuits steven mass

khouly

 

[szekit]

a mixer followed by filter?

 

[khouly]

yeah but in this cas u will feed the mixer with the same singal , to genrate dc ,and twice the freq
it can work also

but i don't know which one will perform better

khouly