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A Transceiver with Delay Cell and Over-current Protection and A Digital Over-temperature Protector for FlexRay ECUsLin, Sheng-Chih 11 July 2012 (has links)
This thesis is composed of two critical circuit designs for FlexRay ECU (Electron-ics Control Unit), i.e., a transceiver with over-current protection, and a digital over-temperature protection circuit.
Regarding the transceiver with over-current protection, to reduce the glitch prob-lem, we propose to use delay cells in the transmitter. In order to avoid the transmitter current which is higher than the upperbound defined by FlexRay specifications, we propose a current comparator circuit to detect the state where the transmitter should stop sending signals.
The temperature protection is required for FlexRay specifications. We propose an over-temperature circuit in the thesis. By utilizing an oscillator-based structure, fre-quency to digital converter (FDC) circuit is developed as the core of the temperature protection mechanism. It will convert the frequency signal and output the sensed tem-perature in a digital code format. The output frequency at different process and temper-ature corners show a linear feature such that the range and accuracy of temperature de-tection is enhanced.
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