Patent ID: 9178530
Filing Date: 2015-11-03
Classification: H03M,H04B

Abstract:
1. A delta sigma modulator, comprising: a filter circuit including at least one integrator having an operational amplifier; a quantizer which quantizes an output signal from the filter circuit; a first digital-to-analog converter which converts a digital output signal from the quantizer into a first analog signal and feed back the first analog signal to the filter circuit; a first addition circuit coupled between an output of the filter circuit and an input of the quantizer, the first addition circuit receiving the output signal from the filter circuit as an input signal, the first addition circuit including at least one passive element, the at least one passive element including a first resistive element; and a second addition circuit including at least one of a first feedforward circuit connecting an input of the filter circuit to the input of the quantizer via a second resistive element, or a first feedback circuit which feeds back the digital output signal from the quantizer, as a second analog signal, to the input of the quantizer, wherein the first addition circuit includes a capacitive element serving as the phase compensator and connected in parallel to the first resistive element.