Title:
DIGITAL AMPLIFIER AND OUTPUT DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/012934
Kind Code:
A1
Abstract:
The present invention achieves a digital amplifier which minimizes and limits analog signal system and utilizes a feedback signal and a dither signal. Provided are: a pulse width modulator (18) for adjusting the pulse width of a digital signal; a switching circuit (24) for amplifying an output signal of the pulse width modulator (18); and an attenuator (34) for generating a feedback signal on the basis of an output signal of the switching circuit (24). The pulse width modulator (18) refers to the feedback signal and adjusts the pulse width of the digital signal. The attenuator (34) is provided with: a first amplifier (36) for outputting a first amplified signal which is an amplified difference between the output signal of the switching circuit (24) and one of a reference voltage and a dither signal; and a second amplifier (38) for amplifying the difference between the first amplified signal and the other of the dither signal and the reference signal, and outputting the amplified difference as the feedback signal.
More Like This:
Inventors:
NAKAHIRA TSUYOSHI
NISHIGAKI AKIHIRO
NISHIGAKI AKIHIRO
Application Number:
PCT/JP2018/023505
Publication Date:
January 17, 2019
Filing Date:
June 20, 2018
Export Citation:
Assignee:
SHARP KK (JP)
International Classes:
H03F3/217; H03F3/68
Foreign References:
| JP2010268211A | 2010-11-25 | |||
| US20110305353A1 | 2011-12-15 | |||
| JP2007135177A | 2007-05-31 | |||
| US20070096811A1 | 2007-05-03 |
Attorney, Agent or Firm:
HARAKENZO WORLD PATENT & TRADEMARK (JP)
Download PDF: