The paper describes methodology for modelling and simulative estimation of sensitivity and range of ISM band Remote Keyless Entry transmitter-receiver system for automotive applications. The method is based on electrical simulation including PCB extraction data and parameters statistical distribution to evaluate best-and worst case scenarios. Both transmitter and receiver circuits are considered, as well as link environmental conditions. Examples of results are given for presented methodology.
The paper analyzes the impact of non-linearity of asynchronous Sigma-Delta analog-to-digital converter (ASD-ADC) characteristics on the quantization process. The ASD-ADC is considered as time-interleaved multi-resolution converter that employs two different characteristics for signal processing alternately. As shown in the paper, the classical uniform quantization of the asynchronous Sigma-Delta modulator (ASDM) output signal by time-to-digital converter is ineffective due to the different shapes of ASDM characteristics that provide disparity of converter resolution transformed into the signal value domain. A need to introduce extra compensation techniques to cope with the problem of balancing the ASD-ADC resolution and shaping the signal-to-noise ratio is emphasized.
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