Class E coil driver with switched capacitor ASK modulation
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United States of America Patent
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Dec 5, 2017
Issued Date -
N/A
app pub date -
Apr 28, 2015
filing date -
Aug 31, 2012
priority date (Note) -
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Abstract
A feedback controlled coil driver with ASK modulation is disclosed. A class E coil driver drives an LC circuit to generate a magnetic signal via the inductor. A modulation capacitor is coupled to the LC circuit to modulate the coil driver signal. The voltage across the coil driver switch is sampled. The difference between the sampled voltage and a reference voltage is integrated and compared to a ramp voltage to obtain an optimal on time for the coil driver switch such that coil current is maximized.
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