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With supplied by the battery, the low power consumption of OBU system chip in ETCS is demanded. This paper designs a low power wake-up circuits applied to OBU system chip. The circuit system extracts envelope signal from an amplitude shift keying (ASK) modulated 5.8 GHz carrier and converts it to digital signal. Only the envelop signal that the frequency of it is 14 KHz can produce the wake-up pulse,...
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