Title:
ANALOG-DIGITAL CONVERSION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2022/202772
Kind Code:
A1
Abstract:
An analog-digital conversion circuit (1) that has a variable gain amplifier (10), a delta-sigma modulator (20) that modulates the output of the variable gain amplifier (10) into a pulse density modulation (PDM) signal, and a decimation filter (30) that down samples the PDM signal and outputs a multi-bit first digital signal. The decimation filter (30) has: a weight modification unit (40) that converts the PDM signal to a second digital signal that has a weight that is the product of the weight of the PDM signal and the reciprocal of the amplification factor of the variable gain amplifier (10); and a first digital filter unit (50) that receives the second digital signal as input and outputs the first digital signal.
Inventors:
KOBAYASHI HITOSHI
Application Number:
PCT/JP2022/013030
Publication Date:
September 29, 2022
Filing Date:
March 22, 2022
Export Citation:
Assignee:
NUVOTON TECH CORPORATION JAPAN (JP)
International Classes:
H03M3/02
Domestic Patent References:
| WO2020241102A1 | 2020-12-03 |
Foreign References:
| JPH07146314A | 1995-06-06 | |||
| JP2005151312A | 2005-06-09 | |||
| US10848170B1 | 2020-11-24 |
Attorney, Agent or Firm:
NII, Hiromori et al. (JP)
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