Panasonic Intellectual Property Management Co., Ltd.

Socionext Inc.

Masashi Uchida

Takashi Morie

Junji Nakatsuka

Kazuo Matsukawa

Yosuke Mitani

Takaaki Sato

Toshihiro Torii

Yoshihiro Horii

This D/A converter includes a plurality of D/A converter elements, each comprising current sources configured to supply output currents to output nodes, and first switches configured to control the output currents. The output nodes are connected to a capacitor section having second switches and a capacitive load. The D/A converter further includes a switch control circuit configured to control the first switches responsive to digital signals, and also control the second switches in accordance with the control of the ON/OFF state of the first switches.

Current type D/A converter, delta sigma modulator, and communications device

In a DAC device, a distortion correction function g1(x) of a harmonic obtained from a result of a frequency analysis on an analog output signal of a DAC circuit is obtained. A correction value is determined based on the correction function g1(x) in accordance with an input digital signal, and is previously stored in a memory. A nonlinear correction circuit reads a corresponding correction value from the memory in accordance with the value of a digital signal output from a digital filter, and transmits the correction value to a subtractor. The subtractor subtracts the correction value from the digital signal output from the digital filter.

DAC device and audio system

Growing community of inventors

Osaka, Japan

Masashi Uchida