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An Efficient Pulse Width Measurement Method using Multiphase Clock Signals for Capacitive Touch Switches
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 Title & Authors
An Efficient Pulse Width Measurement Method using Multiphase Clock Signals for Capacitive Touch Switches
Seong, Kwang-Su;
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We propose an efficient method to measure a pulse width using multiphase clock signals generated from a ring oscillator. These clocks, which have the same frequency and are evenly spaced, give multiple rising edges within a clock cycle. Thus, it is possible to measure a pulse width more accurately than with existing single clock-based methods. The proposed method is applied to a capacitive touch switch. Experimental results show that the capacitive touch switch with the proposed method gives a 118 fF resolution, which is 6.4 times higher than that of the touch switch with a single clock-based pulse width measurement method.
Capacitive touch switch;Multiphase clock signal;Pulse width measurement;Ring oscillator;
 Cited by
스위치드 커패시터를 이용한 동작 주파수에 무관한 정전용량 터치스위치,이무진;성광수;

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