JPS6484921A - A/d converter - Google Patents
A/d converterInfo
- Publication number
- JPS6484921A JPS6484921A JP24214287A JP24214287A JPS6484921A JP S6484921 A JPS6484921 A JP S6484921A JP 24214287 A JP24214287 A JP 24214287A JP 24214287 A JP24214287 A JP 24214287A JP S6484921 A JPS6484921 A JP S6484921A
- Authority
- JP
- Japan
- Prior art keywords
- output
- input
- comparator
- inverter
- noise
- 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
Abstract
PURPOSE:To obtain a delta/sigma modulator for operating satisfactorily even in case of a small signal by providing a means for generating a white noise of one bit, and a means for superposing the difference of values at two continuous sampling time points of its noise, to the input of a comparator. CONSTITUTION:With respect to the input of a comparator 8 in the delta/sigma modulator A, a noise generating part B constituted of a means for taking a difference at two continuous sampling time points of the output of an inverter 15 by taking the sum of a white noise generating means 13 of one bit, a D-type FF14 for delaying its output 11 by 1 sampling time, an inverter 15, the output 11 and the output of the inverter 15 is provided, and its output is superposed to the input of the comparator 8. The output 4 of an adder 16 can take three kinds of values of '0', '1', and 2, and in case of superposing them, '0', '1', and 2 correspond to -1, '0' and '1', respectively. In such a way, by adding a noise component, even when an input signal is small, a satisfactory S/N characteristic can be obtained, and an A/D converter for satisfying various specifications can be realized.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24214287A JPS6484921A (en) | 1987-09-25 | 1987-09-25 | A/d converter |
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 |
EP88115804A EP0308982B1 (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 |
---|---|---|---|
JP24214287A JPS6484921A (en) | 1987-09-25 | 1987-09-25 | A/d converter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6484921A true JPS6484921A (en) | 1989-03-30 |
Family
ID=17084939
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24214287A Pending JPS6484921A (en) | 1987-09-25 | 1987-09-25 | A/d converter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6484921A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008221418A (en) * | 2007-03-14 | 2008-09-25 | Nachi Fujikoshi Corp | Broach for internal gear machining |
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 |
-
1987
- 1987-09-25 JP JP24214287A patent/JPS6484921A/en active Pending
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 |
JP2008221418A (en) * | 2007-03-14 | 2008-09-25 | Nachi Fujikoshi Corp | Broach for internal gear machining |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR930001596A (en) | Frequency Relay Coherent Analog-to-Digital Conversion System and its Method for Modulated Signals | |
EP0270191A3 (en) | Divider circuit | |
EP0065396A3 (en) | Dc-ac converter | |
JPS6484921A (en) | A/d converter | |
JPS56136027A (en) | Signal processor having quantization distortion reduced | |
GB1534233A (en) | Frequency/phase comparator | |
AU558449B2 (en) | A dpcm-coder | |
JPS5658335A (en) | Pll | |
ES8703068A1 (en) | Sampling rate converter for delta modulated signals. | |
JPS5531310A (en) | Detection circuit for phase difference fluctuation | |
ES8601521A1 (en) | A convolution processor. | |
JPS53127257A (en) | Frequency-voltage convertor | |
EP0180461A3 (en) | Improvements in or relating to digital to analogue converters | |
DE3783786D1 (en) | CIRCUIT FOR DIGITAL COMPENSATION OF A DETERMINED NOISE SIGNAL. | |
SU909790A1 (en) | Device for control of power-diode converter with elevated-frequency stage | |
JPS6447121A (en) | Pulse width modulation signal generating circuit | |
SU1713081A1 (en) | Frequency-modulated signal shaper | |
JPS647706A (en) | Fm detecting device | |
UA16966A1 (en) | Crane balance | |
IT1047730B (en) | Phase compressor has chain of phase suppressors - each with limiter and input adder coupled to earlier stage and to reference generator (NL090476) | |
JPS56140725A (en) | Digital voltage-current converter | |
JPS54161258A (en) | Voltage-frequency converter | |
JPS56149827A (en) | 90 phase difference signal generating circuit | |
JPS57145440A (en) | Phase synchronizing circuit | |
JPS5673966A (en) | Output monitor circuit of digital tone generator |