Microphone using xlr

[MadMan_Tom]

hey guys, im looking to buy an audio technical at2020, I heard that you have to use phantom power like using a mixer such as the line 6 pod, but I have looked and found a cable which is a xlr to usb, is this is simple as that just plug into your mic and then into the computer, and if so will this affect audio quality from the microphone? and if it makes it worse would it be worth investing in a product as the line 6 pod ux2 for good quality?

[t0wer]

 I have looked and found a cable which is a xlr to usb

 

if it has phantom voltage it should be fine.

[Cheesebaron]

An alternative could be to use something like a Blue Icicle or as you said a mixer.

[MadMan_Tom]

is the blue icicle of good audio quality, I know mixers can be over £100 but the blue icicle seems to be about £47, is there a major difference in the quality because of the price do you know?