The strength purists out there who hate cardio, would have you believe any cardio whatsoever is going to turn you into a weak little girl, but it appears the bro science has been right all along.
Check this study out
Researchers did a trial with 10 healthy male students of whom the average age was 23. In one instance the students had to cycle for 60 minutes at 50 percent of their VO2max. [E] You could still carry on conversation quite easily at that rate
On another occasion the test subjects did weight training before cycling. They did 3-4 sets of the shoulder press, biceps curl, squat, bench press and lat pulldown for 10 reps. After this they rested for 20 minutes [RE20] and on another occasion they rested 120 minutes before they started their cardio workout [RE120].
Basically, the subjects lost more fat on the RE20 combination ( weights, rest 20 minutes, do cardio ) than doing cardio on its own or doing weights and resting for 120 minutes then doing cardio
The mechanism by which this works researchers have hypothesised is probably because the stress hormones adrenalin and noradrenalin are released during weight training. These stimulating hormones initiate the fat cells to release their contents into the bloodstream.
It also appears that subjects doing cardio 20 minutes after weight training had the highest growth hormone levels too. Double the good news as growth hormone is a fat burner and promotes recovery.
So if you if enjoy doing your cardio and weights together and your currently doing your cardio after weights, your on the right track. The caveat here is not so much cardio that you contaminate your strength training.