In the Smart List dialog, select the advanced filter at the very bottom of the filters list.

Then select "matches" from the dropdown menu and add the following to the input field before saving.

scheduleDate endOfWeek <= scheduleDate startOfWeek >= &&

What this smart list does is compare the schedule/do date of the item with the dates that mark the start and the end of the current week.
 
Also, don't forget to set  Backburner: Not on Backburner  if  you wish this list not to include the tasks that re on the Backburner.

You can read more about how to set up advanced Smart List filters here:
Advanced Smart List Filters and also see Advanced Smart List Examples.

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