CPLD based implementation of digital control for a thermal measurement instrument

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Dr. Ress Sándor László
Department of Electron Devices

Thermal measurement is the most efficient way to analyze the structure of semiconductors and integrated circuits. Mentor Graphics Hungary Ltd., where I did my summer internship, is specialised in this field, and had designed a so-called Thermal Transient Tester equipment. This equipment originally contained two controller cards. During the internship, one of these controller cards has been redesigned with success, based on a CPLD. Therefore further development, now including both controller cards, a new backplane and a revised measurement card could have been started.

In this BSc thesis, the structure of the equipment, as well as the bus and card system will be detailed, along with the functional description and communication of the controller cards. Necessary to describe the compatibility between old and new models, and all versions form a fully functioning system as it can be seen further on.

Stating the problem to be solved is followed by the discussion on the various types of Programmable Logic Devices with their basic properties. After the selection, the circuit design, including the supplementary electrical components is being discussed. The skeleton of the Verilog code, which is necessary for the programming the device, ends this section.

The basic aspects for the modification of the backplane are minimalizing the noise and unburdening the assembly.

In order to test the new functions of the controller card, a new measurement card system is designed, the implementation is beyond this thesis. With the revised measurement card, multiple simultaneous measurements will be able to carry out on the same slot using the memory paging of these cards. To be able to find effective solution, the memory operation is specified.

Besides the design, the comparison of old and new models is also emphasised.

This BSc thesis ends with the summarization of the performed work, and investigates the further possibilities. Shrinking the control logic onto one card, and increasing the functionality of the measurement cards gives us great opportunity to decrease the whole size of the equipment, and assemble one with half width. This reduced size device would be ideal as a presentational tool. On the other hand, with the new control card, 8 additional measurement cards will be able to operate, therefore carrying out synchronous measurements on 16 channels.


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