High precision resistor and trimming method thereof

An electronic device comprising:

• first and second pairs of contacts;
• a trimming circuit;
• and
• a resistor comprising a phase change material having an electrically modifiable resistivity responsive to the trimming circuit;
• said resistor comprising first and second portions extending transversely and in direct electrical contact to each other at a crossing area, the first and the second portions being coplanar at least at the crossing area, at least one of the first and second portions having a varying width;
• said first and second portions each having respective ends connected to respective ones of the first and second pairs of contacts.

A method for making an electronic device comprising:

• forming first and second pairs of contacts;
• and
• forming a resistor comprising a phase change material so as to have an electrically modifiable resistivity;
• said resistor comprising first and second portions extending transversely and in direct electrical contact to each other at a crossing area, at least one of the first and second portions having a varying width;
• said first and second portions each having respective ends connected to respective ones of the first and second pairs of contacts.

An electronic device comprising:

• first and second pairs of contacts;
• and
• a resistor comprising a phase change material so as to have an electrically modifiable resistivity;
• said resistor comprising first and second portions extending transversely and in direct electrical contact to each other at a crossing area, the second portion comprising a plurality of sections extending transversely and crossing the first portion;
• said first and second portions each having respective ends connected to respective ones of the first and second pairs of contacts.

An electronic device comprising:

• first and second pairs of contacts;
• and
• a resistor comprising a phase change material so as to have an electrically modifiable resistivity, and first and second parallel coupled branches;
• said resistor comprising first and second portions extending transversely and in direct electrical contact to each other at a crossing area;
• said first and second portions each having respective ends connected to respective ones of the first and second pairs of contacts.

An electronic device comprising:

• first and second pairs of contacts;
• a resistor comprising a phase change material so as to have an electrically modifiable resistivity;
• said resistor comprising first and second portions extending transversely and in direct electrical contact to each other at a crossing area;
• said first and second portions each having respective ends connected to respective ones of the first and second pairs of contacts;
• and
• a trimming circuit configured to generate a trimming current coupled to the second pair of contact regions;
• said trimming circuit comprising a current source, a control stage coupled to and supplying control signals to the current source, and a temperature sensor coupled to the control stage.