Current controlled word and sense source

A current controlled sense current source for a magnetoresistive random access memory comprising:

• a current source having a stable reference current output;
• a sense current source having a sense current reference input connected to the stable reference current output with the sense current source having a sense current output;
• bias tuning circuit comprising, in combination;
• a bias generator having a bias output;
• a plurality of switches having a word reference input and a mirror transistor output;
• a plurality of mirror transistors connected to one of the mirror transistor outputs;
• a transistor connected in a mirror configuration with the plurality of mirror transistors having a tuned reference output;
• a selector to select one of the mirror transistor to activate the transistor to set the voltage to the plurality of mirror transistors;
• a pad;
• and
• a indicator transistor in a mirror configuration with the transistor connected to the pad to provide an indicator.