Abstract: A capacitive sensing method is provided. The capacitive sensing method includes the step of alternately charging/discharging a capacitive sensing electrode of a capacitive sensor for predetermined times under an active mode and charging/discharging the capacitive sensing electrode during a fixed period under a standby mode while an object is not coupled to the capacitive sensing electrode, in which the capacitive sensing electrode has a first capacitance while the object is not coupled to the capacitive sensing electrode. The capacitive sensing method also includes the step of generating a switch signal while the object is coupled to the capacitive sensing electrode under the standby mode such that the capacitive sensing electrode has a second capacitance larger than the first capacitance and the step of switching the standby mode to the active mode according to the switch signal.

Abstract: A capacitive sensing method is provided. The capacitive sensing method includes the step of alternately charging/discharging a capacitive sensing electrode of a capacitive sensor for predetermined times under an active mode and charging/discharging the capacitive sensing electrode during a fixed period under a standby mode while an object is not coupled to the capacitive sensing electrode, in which the capacitive sensing electrode has a first capacitance while the object is not coupled to the capacitive sensing electrode. The capacitive sensing method also includes the step of generating a switch signal while the object is coupled to the capacitive sensing electrode under the standby mode such that the capacitive sensing electrode has a second capacitance larger than the first capacitance and the step of switching the standby mode to the active mode according to the switch signal.

Abstract: An improved single channel modulator employs a memory reduction circuit. The single channel modulator receives input data symbols and a clock signal, and responsive thereto, generates frequency variation trajectories b(t) that are used to generate a modulated signal s(t). An improved digital pulse shaping filter that performs a convolution operation between the input data symbols and a pulse shaping filter function g(t) is provided. The pulse shaping filter includes a counter, a shift register, and a memory that stores encoded non-duplicative values of the pulse shaping responses. The memory has an input for receiving address signals. The counter provides a first set of address signals to the memory, and the shift register provides an output. A memory reduction circuit is coupled to the shift register to receive an input data symbol, and based on the input data symbol, provides a second set of address signals to the memory.