Detecting small signals with a Comparator demands that the total voltage offset is lower than the actual signal. The total offset includes the voltage offset in the Comparator and the voltage offset that is created by the offset currents that flows thru the load at the Comparators input. The goal with this Comparator that has been developed has been that it will have a total voltage offset at maximum 500 uV. The Comparator does not need to be extremely fast or does not need to operate in a big frequency area. To have all the flexibility that is needed a full custom technique is used.

Det finns fördelar med att använda projektfinansiering vid PPP. Undersökningen visar att projektfinansiering är ett enastående verktyg för riskallokering. Dessutom resulterar projektfinansiering i minskade kostnader för agentkonflikter. Emellertid är privat finansiering normalt sett dyrare än offentlig finansiering..

This rapport is result of a project. The purpose of which was to design a circuit that is used in a heat glove. The heat glove is the technical aid which provides heat inside a glove.It is specially suited for old people who have problems with cold hands because of decreased blood circulation.There already was an old circuit in the glove that gives a constant current which develops heat from battery to glove through a circuit. The temperature is between 32 and 34 degrees.The problem with the existing circuit was to regulate the temperature. There is only on/off switch and there is no way to adjust desirable value of the temperature.In order to solve the problem the old circuit was investigated.

The purpose with the report is to show that it is possible to design a class-D amplifier, using a programmable FPGA mounted on a developing card from Xess and a H-bridge. The FPGA was programmed in VHDL which is the language the software from Xilinx use to implement a logical function into the FPGA The logical function corresponds to a modeling of the music signal and the modeling can be described as a Comparator which compare the music signal with a triangle wave and as a out signal produce a pulse width modulated (PWM) signal. The report is also a review and evaluating of two different modulating technologies, AD- modeling and BD-modeling. A detailed part about how the H-bridge was designed and how it works. The result of this project is a working audio amplifier to a significant lower price than the products in todays market..