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1. (WO2018123201) DIFFERENTIAL-OUTPUT D/A CONVERTER AND A/D CONVERTER

Pub. No.:    WO/2018/123201    International Application No.:    PCT/JP2017/036636
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Wed Oct 11 01:59:59 CEST 2017
IPC: H03M 1/74
H03M 1/38
H03M 1/68
Applicants: DENSO CORPORATION
株式会社デンソー
Inventors: FUJIMOTO, Yu
藤本 悠
NEZUKA, Tomohiro
根塚 智裕
MAKIHARA, Tetsuya
牧原 哲哉
MORINAGA, Takeshi
森永 剛
Title: DIFFERENTIAL-OUTPUT D/A CONVERTER AND A/D CONVERTER
Abstract:
A differential-output D/A converter according to the present disclosure is provided with: decoders (2p, 2n) for converting inputted data into thermometer code; a positive-side capacitor array (3p, 3Ap, 3Bp, 3Cp) comprising a plurality of unit capacitors (Cp) having one end connected to a positive-side output terminal, and a switch (SWp) for switching the other end of the unit capacitors so as to connect to a positive-side reference voltage or a negative-side reference voltage in accordance with the thermometer code; and a negative-side capacitor array (3n, 3An, 3Bn, 3Cn) comprising a plurality of unit capacitors (Cn) having one end connected to a negative-side output terminal, and a switch (SWn) for switching the other end of the unit capacitors so as to connect to the positive-side reference voltage or the negative-side reference voltage in accordance with the thermometer code. The positive-side and negative-side capacitor arrays are disposed in an discretionary first direction. The unit capacitors constituting each of the arrays are arranged in a second direction orthogonal to the first direction. The unit capacitors corresponding to the thermometer code in the positive-side and negative-side capacitor arrays are disposed so as to be point-symmetrical with respect to the center of the arrays as the symmetry point.