US 10,097,179 B2 · Mixing module and capacitive touch panel

Abstract

A mixing module (40) comprises a switching mixer (400), controlled by a switch signal and configured to receive an inputting signal and generate an outputting signal; a modulating unit (402), coupled to the switching mixer (400) and configured to generate the switch signal; wherein a switching frequency of the switch signal is higher than an and is a specific multiple of inputting frequency of the inputting signal. The mixing module (40) controls the switching mixer (400) by using the switch signal which is much higher than the inputting frequency of the inputting signal; oversampling is performed on the inputting signal, so that the spectrum energy of the outputting signal is more concentrated, which can avoid the additional noise due to the introduction of sidelobes or harmonics.

Claims15

Dependent claims

A mixing module, comprising:

a switching mixer, controlled by a switch signal, and configured to receive an inputting signal and generate an outputting signal;
and
a modulating unit, coupled to the switching mixer, and configured to generate the switch signal;
wherein a switching frequency of the switch signal is higher than an inputting frequency of the inputting signal and is a multiple of the inputting frequency of the inputting signal,
wherein the modulating unit is a Delta-Sigma modulator comprising:
a subtracting unit, configured to generate a subtracting signal according to a modulation inputting signal and the switch signal;
a summing unit, coupled to the subtracting unit, configured to receive the subtracting unit and generate a summing signal;
and
a determining and outputting unit, coupled to the summing unit and the subtracting unit and configured to output the switch signal.

6 more elements

Dependencies are inferred from the claim text.

Mixing module and capacitive touch panel

Life of this patent

Mixing module and capacitive touch panel

Life of this patent

Abstract

Claims15