| 摘要 |
A read device of a capacitive sensor includes: a signal source (104, C1, C2) supplying an electrical read signal (V RD ) for driving the capacitive sensor (101); and a discrete-time sense circuit (107) for generating an electrical output signal (V OM ), correlated to variations of capacitance (”C S ) of the capacitive sensor (101), in response to variations of the electrical read signal (V RD ). The device moreover includes: a modulator stage (105, 106) for generating a modulated electrical read signal (V RDM ) on the basis of the electrical read signal (V RD ) and supplying the modulated electrical read signal (V RDM ) to the capacitive sensor (101); a demodulator stage (110), connected to the sense circuit (107), for demodulating the electrical output signal (V OM ) and generating a demodulated electrical output signal (V OM ); and a lowpass filtering stage (112) for generating a filtered electrical output signal (V OC ), on the basis of the modulated electrical output signal (V OM ). |
