Capacitor sensing circuit having anti-electromagnetic interference capability
An anti-electromagnetic interference, capacitive sensing technology, applied in measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve initial voltage inaccuracy, capacitance detection error, and capacitance detection consumes frequency cycles, etc. problem, to achieve the effect of eliminating common mode noise and reducing the number of frequency cycles
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[0073] In order to have a further understanding and understanding of the structural features of the present invention and the achieved effects, the preferred embodiments and accompanying drawings are used for a detailed description, as follows:
[0074] see Figure 4 , is a block diagram of a capacitive sensing circuit according to a preferred embodiment of the present invention. As shown in the figure, the capacitive sensing circuit with anti-electromagnetic interference capability of the present invention can be applied to fingerprint identification, acceleration sensor and touch panel, etc. The capacitance sensing circuit includes a filter 10 and a differential circuit 20 . The filter 10 is coupled to a capacitor under test 30, and the filter 10 receives a complex reference signal to generate a first filtered signal and a second filtered signal, that is, the filter 10 receives a first reference signal V REF1 , a second reference signal V REF2 , a third reference signal V...
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