Title:
AUDIO CIRCUIT, ELECTRONIC DEVICE USING SAME, AND IN-VEHICLE AUDIO SYSTEM
Document Type and Number:
WIPO Patent Application WO/2022/070711
Kind Code:
A1
Abstract:
This class-D amplification circuit 200 receives an analog audio signal VIN that uses a first reference voltage VFIL as a center level, and outputs an output pulse signal SOUT that has a duty cycle corresponding to the analog audio signal VIN. A bias circuit 310 generates a second reference voltage VFILP that has a voltage level obtained by dividing the first reference voltage VFIL and a power supply voltage VCC. A cyclic voltage generation circuit 260 of the class-D amplification circuit 200 generates a cyclic voltage VOSC of a sawtooth wave or a triangular wave having an amplitude corresponding to the second reference voltage VFILP.
Inventors:
SAKAI MITSUTERU (JP)
Application Number:
PCT/JP2021/031523
Publication Date:
April 07, 2022
Filing Date:
August 27, 2021
Export Citation:
Assignee:
ROHM CO LTD (JP)
International Classes:
H03K7/08; H03F3/217; H03K4/06; H04R3/00
Foreign References:
| JP2012029185A | 2012-02-09 | |||
| JP2016046544A | 2016-04-04 | |||
| US20180234062A1 | 2018-08-16 | |||
| JP2004312594A | 2004-11-04 | |||
| JP2003273671A | 2003-09-26 |
Attorney, Agent or Firm:
MORISHITA Sakaki (JP)
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