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Examples of touch sensor layout.Įach blue geometric area represents a sensor electrode on a printed circuit board (PCB) that forms one plate of a virtual capacitor. Capacitive Touch Sensor Controller-A Novel User Input MethodĪ capacitive touch sensor provides a user interface in the form of a push button, a slider bar, a scroll wheel, or other forms similar to the examples shown in Figure 1. This article will focus on capacitance-to-digital converter (CDC) technology, which enables the use of high performance capacitance sensing in healthcare applications. The challenges for healthcare equipment include developing new diagnosis and treatment methods, enabling remote monitoring and home healthcare devices, improving quality and reliability, and enhancing flexibility and ease of use.įor more than 40 years, Analog Devices’ comprehensive portfolio of linear, mixed-signal, MEMS, and digital signal-processing technologies have helped make a difference in healthcare designs in areas such as instrumentation, imaging, and patient monitoring. In recent years, advances in electronic technology have made many innovations and improvements in the healthcare industry possible. The SAR output is 10000000.ADI Capacitance-to-Digital Converter Technology in Healthcare Applications During first clock pulse, bit D 7 is set to 1 and V out becomes half reference voltage.
#Analog to digital converter application tv
At tV out, the comparator output is positive.ADC output can be sent over long distances.So, it is also called as voltage to time conversion.Therefore, the analog voltage is converted into time and the time counts represent the magnitude of the voltage(digital value).The time duration of the gate opening is proportional to the input analog voltage.Once ramp voltage reaches zero voltage, the ground comparator generates a pulse that will close the gate and hence counter.
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The another ground comparator compares the ramp voltage.