JPS6484920A - A/d converter - Google Patents
A/d converterInfo
- Publication number
- JPS6484920A JPS6484920A JP24214187A JP24214187A JPS6484920A JP S6484920 A JPS6484920 A JP S6484920A JP 24214187 A JP24214187 A JP 24214187A JP 24214187 A JP24214187 A JP 24214187A JP S6484920 A JPS6484920 A JP S6484920A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- output
- generating
- difference
- terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Analogue/Digital Conversion (AREA)
Abstract
PURPOSE:To obtain a primary prediction primary noise shaping A/D converter being effective even in case of a small signal by providing a means for generating a white noise of one bit, and a means for obtaining an output of a difference at two continuous sampling time points of its output. CONSTITUTION:As for a signal inputted from a terminal 1, an output 3 of a predicting device B and a signal of a terminal 4 are brought to D/A conversion and subtracted by a means 5 for taking a difference and accumulated by an integrator 7. Also, in this case, a digital signal of the terminal becomes an output signal of an A/D converter. The result of accumulation by the integrator 7 is added to a signal generated by a noise generating part C, by an adder 6 and whether it is positive or negative is decided by a comparator 8. The result of decision is held for one sampling period by an FF 11, and its inversion signal is applied to the predicting device B. In said generating part C, an output 12 of a difference at two continuous sampling time points of an output of a white noise generating means 15 for generating a white noise of one bit is obtained and superposed to an input of the comparator 8. Therefore, even when an input signal is small, the satisfactory S/N characteristic is obtained.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24214187A JPS6484920A (en) | 1987-09-25 | 1987-09-25 | A/d converter |
| EP88115804A EP0308982B1 (en) | 1987-09-25 | 1988-09-26 | Analog-to-digital converter having an excellent signal-to-noise ratio for small signals |
| DE3854414T DE3854414T2 (en) | 1987-09-25 | 1988-09-26 | AD converter with excellent signal-to-noise ratio for small signals. |
| US07/249,158 US5010347A (en) | 1987-09-25 | 1988-09-26 | Analog-to-digital converter having an excellent signal-to-noise ratio for small signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24214187A JPS6484920A (en) | 1987-09-25 | 1987-09-25 | A/d converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6484920A true JPS6484920A (en) | 1989-03-30 |
Family
ID=17084923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24214187A Pending JPS6484920A (en) | 1987-09-25 | 1987-09-25 | A/d converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6484920A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009510912A (en) * | 2005-09-30 | 2009-03-12 | エヌエックスピー ビー ヴィ | System and method for adjusting dither in a delta-sigma modulator |
| WO2018109992A1 (en) * | 2016-12-14 | 2018-06-21 | ソニーセミコンダクタソリューションズ株式会社 | Delta-sigma modulator, electronic apparatus and method for controlling delta-sigma modulator |
-
1987
- 1987-09-25 JP JP24214187A patent/JPS6484920A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009510912A (en) * | 2005-09-30 | 2009-03-12 | エヌエックスピー ビー ヴィ | System and method for adjusting dither in a delta-sigma modulator |
| WO2018109992A1 (en) * | 2016-12-14 | 2018-06-21 | ソニーセミコンダクタソリューションズ株式会社 | Delta-sigma modulator, electronic apparatus and method for controlling delta-sigma modulator |
| US10659074B2 (en) | 2016-12-14 | 2020-05-19 | Sony Semiconductor Solutions Corporation | Delta-sigma modulator, electronic device, and method for controlling delta-sigma modulator |
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