anlayse
u can say that gilbert cell has three parts , the transconductor , the switching and the load
the transconductor is the lower pair , which u inject the RF to them , the quad , used as the switching , the output used the resistance or inductance to get the output
usually the gain of the mixer depends on the gm of the tarnsconductor , and the switching , is it a sinusoid or square wave switching , also the gain depends on the load , and also the output frequency spectrum depends on the load is it tuned or resistive for wide band operation
khouly