JPS62227221A - Analog-digital converter - Google Patents

Analog-digital converter

Info

Publication number
JPS62227221A
JPS62227221A JP7023586A JP7023586A JPS62227221A JP S62227221 A JPS62227221 A JP S62227221A JP 7023586 A JP7023586 A JP 7023586A JP 7023586 A JP7023586 A JP 7023586A JP S62227221 A JPS62227221 A JP S62227221A
Authority
JP
Japan
Prior art keywords
converter
digital signal
noise
reference voltage
circuit
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
Application number
JP7023586A
Other languages
Japanese (ja)
Inventor
Hideki Inomata
英樹 猪股
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP7023586A priority Critical patent/JPS62227221A/en
Publication of JPS62227221A publication Critical patent/JPS62227221A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To eliminate digitally noise by detecting the noise included in a reference voltage and selecting an output of an A/D converter and an output of a timing adjusting circuit based on the detection so as to utilize the noise of the reference voltage. CONSTITUTION:A selection signal 11 latched by a flip-flop 10 is used as a control signal of a selection circuit 12 to select a digital signal of a low-order 2-bit outputted from an A/D converter 1 and a digital signal of a low-order 2-bit outputted from a timing adjusting circuit 1A. If noise is inscluded in a reference voltage 5, the low-order bit of the digital signal 6 is effected by the noise and the low-order bit of the digital signal effected by the noise is replaced with a digital signal subject to A/D conversion and the result is outputted. As to the low-order 2-bit of the digital signal, the time adjustment is applied by a holding circuit 8 and a delay circuit 13 and all bits together with the low-order 2-bit selected by the selection circuit 12 are latched by a latch circuit 3.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は基準電圧を用いてフルスケール電圧を決定し
、このフルスケール電圧に基づいてアナログ信号をディ
ジタル信号に変換するA/D変換器を備えたA/D変換
装置に関する。
[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an A/D converter that determines a full-scale voltage using a reference voltage and converts an analog signal into a digital signal based on this full-scale voltage. The present invention relates to an A/D conversion device equipped with an A/D conversion device.

〔従来の技術〕[Conventional technology]

従来のこの種のA/D変換装置を第3図に示す。 A conventional A/D converter of this type is shown in FIG.

第3図において、lはアナログ信号をディジタル信号に
変換するA/D変換器、2はA/D変換器1によってA
/D変換を行う場合フルスケール電圧を定めるために基
準電圧を発生させる基準電圧発生器、3はA/D変換器
1によってディジタル変換したディジタル信号をラッチ
するフリップフロップで構成されるラッチ回路、4はA
/D変換するアナログ信号、5は基準電圧発生器2から
発生する基準電圧、6はA/D変換器1から出力された
ディジタル信号、7はクロック信号である。
In FIG. 3, l is an A/D converter that converts an analog signal into a digital signal, and 2 is an A/D converter that converts an analog signal into a digital signal.
a reference voltage generator that generates a reference voltage in order to determine a full-scale voltage when performing A/D conversion; 3 a latch circuit composed of a flip-flop that latches a digital signal converted into a digital signal by the A/D converter 1; is A
5 is a reference voltage generated from the reference voltage generator 2, 6 is a digital signal output from the A/D converter 1, and 7 is a clock signal.

次に動作について説明する。Next, the operation will be explained.

アナログ信号4がA/D変換器1に入力されると、この
A/D変換器1は基準電圧発生器2から発生した基準電
圧5に基づき、基準電圧5とアース間でフルスケール電
圧を決定シ、このフルスケール電圧に従ってアナログ信
号4をクロック信号のクロックごとにディジタル信号6
に変換する。
When the analog signal 4 is input to the A/D converter 1, the A/D converter 1 determines the full-scale voltage between the reference voltage 5 and ground based on the reference voltage 5 generated from the reference voltage generator 2. According to this full-scale voltage, the analog signal 4 is converted to the digital signal 6 every clock of the clock signal.
Convert to

このディジタル信号6はラッチ回路3でラッチされ、数
々の処理に用いられる。
This digital signal 6 is latched by a latch circuit 3 and used for various processing.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

従来のA/D変換装置は以上のように構成されていたの
で、例えば基板上のパターンの引き回しや部品の配置等
によって大きく左右される雑音が基準電圧に含まれいた
場合、この雑音がA/D変換器1によってA/D変換さ
れてディジタル信号6に乗ってしまう問題点があった。
Conventional A/D converters are configured as described above, so if the reference voltage contains noise that is largely affected by the wiring of the pattern on the board, the arrangement of components, etc., this noise will be There was a problem in that the signal was A/D converted by the D converter 1 and added to the digital signal 6.

この発明は上記のような問題点を解決するためになされ
たもので、ディジタル信号に含まれる雑音を除去するA
/D変換装置を得ることを目的とする。
This invention was made to solve the above-mentioned problems, and it is an A
The purpose of this invention is to obtain a /D conversion device.

〔問題点を解決するための手段〕[Means for solving problems]

このためこの発明はA/D変換器1の出力を一定時間保
持し、時間を遅らせて出力するタイミング調整回路IA
と、基準電圧に含まれている雑音を検出し、この検出に
もとづいてA/D変換器1の出力と、タイミング調整回
路IAの出力との選択を行う選択回路12とを備えたこ
とを特徴とするものである。
For this reason, the present invention has a timing adjustment circuit IA that holds the output of the A/D converter 1 for a certain period of time and outputs it with a delay.
and a selection circuit 12 that detects noise contained in the reference voltage and selects between the output of the A/D converter 1 and the output of the timing adjustment circuit IA based on this detection. That is.

〔作用〕[Effect]

この発明にかかるタイミング調整回路はA/D変換器の
出力を一定時間保持し、時間を遅らせて出力する。
The timing adjustment circuit according to the present invention holds the output of the A/D converter for a certain period of time, delays the time, and outputs the output.

一方選択回路は基準電圧に含まれている雑音を検出し、
この検出にもとづいてA/D変換器の出力と、タイミン
グ調整回路の出力との選択を行う。
On the other hand, the selection circuit detects the noise included in the reference voltage,
Based on this detection, the output of the A/D converter and the output of the timing adjustment circuit are selected.

〔発明の実施例〕[Embodiments of the invention]

以下、この発明の一実施例を図について説明する。 An embodiment of the present invention will be described below with reference to the drawings.

第1図は本発明の一実施例を示す構成図で、図において
、8はA/D変換器1から出力されるディジタル信号6
を一定時間保持するフリップフロップで構成される保持
回路、13は保持回路8によって保持されているディジ
タル信号を一定時間遅らせて出力する遅延回路、9は基
準電圧発生器2から出力される基準電圧5に含まれてい
る雑音を検出して増幅する増幅器、10は増幅器9によ
って増幅された雑音を選択信号としてTTLレベルの信
号に変換し、A/D変換器1から出力されるディジタル
信号6との時間合わせを行うフリップフロップ、11は
フリップフロップ10から出力される選択信号、12は
選択信号11に基づいてA/D変換器1の出力とタイミ
ング調整回路IAの出力との選択を行う選択回路である
FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 8 is a digital signal 6 output from the A/D converter 1.
13 is a delay circuit that delays the digital signal held by the holding circuit 8 for a certain period of time and outputs it; 9 is a reference voltage 5 output from the reference voltage generator 2; An amplifier 10 detects and amplifies the noise contained in the amplifier 9, converts the noise amplified by the amplifier 9 into a TTL level signal as a selection signal, and converts the noise amplified by the amplifier 9 into a TTL level signal, which is combined with the digital signal 6 output from the A/D converter 1. A flip-flop performs time adjustment; 11 is a selection signal output from the flip-flop 10; 12 is a selection circuit that selects between the output of the A/D converter 1 and the output of the timing adjustment circuit IA based on the selection signal 11; be.

ここにタイミング調整回路IAは保持回路8と遅延回路
13とで構成されている。 。
Here, the timing adjustment circuit IA is composed of a holding circuit 8 and a delay circuit 13. .

次に動作について説明する。Next, the operation will be explained.

A/D変換器1に入力されたアナログ信号4は基準電圧
5によって決定されたフルスケール電圧に基づいてディ
ジタル信号に変換される。
The analog signal 4 input to the A/D converter 1 is converted into a digital signal based on the full-scale voltage determined by the reference voltage 5.

−力増幅器9は基準電圧5に含まれている雑音を増幅し
、A/D変換器lから出力されるディジタル信号6との
時間合わせを行うためフリップフロップtoでラッチす
る。
- The power amplifier 9 amplifies the noise contained in the reference voltage 5, and latches it with the flip-flop to in order to time-align it with the digital signal 6 output from the A/D converter l.

このときの増幅器9の増幅率はA/D変換器の単位ビッ
ト当たりの電圧をTTLレベルの電圧1.4Vで割り、
次式(1)で決定する。
The amplification factor of the amplifier 9 at this time is calculated by dividing the voltage per unit bit of the A/D converter by the TTL level voltage of 1.4V.
It is determined by the following formula (1).

フリップフロップ10でラッチした選択信号11は選択
回路12の制御信号として用い、A/D変換器1から出
力される下位2ビツトのディジタル信号とタイミング調
整回路から出力される下位2ビツトのディジタル信号と
の選択を行う。
The selection signal 11 latched by the flip-flop 10 is used as a control signal for the selection circuit 12, and is used as a control signal for the selection circuit 12, and is combined with the lower 2-bit digital signal output from the A/D converter 1 and the lower 2-bit digital signal output from the timing adjustment circuit. Make a selection.

これにより基準電圧5に雑音が含まれていた場合、ディ
ジタル信号6の下位ビットが雑音で動くが、この雑音で
動くディジタル信号の下位ビットは1クロツク前にA/
D変換されたディジタル信号と切換えて出力する。
As a result, if the reference voltage 5 contains noise, the lower bits of the digital signal 6 will move due to the noise, but the lower bits of the digital signal that move due to this noise will be
It is switched to the D-converted digital signal and output.

またディジタル信号の下位2ビツト以外については保持
回路8と遅延回路9とによって時間調整を行い、選択回
路12によって選択された下位2ビツトと合わせて全ビ
ットをラッチ回路3でラッチする。この時のタイムチャ
ートを第2図に示す。
Further, time adjustment is performed for the digital signal other than the lower two bits by the holding circuit 8 and the delay circuit 9, and all bits, including the lower two bits selected by the selection circuit 12, are latched by the latch circuit 3. A time chart at this time is shown in FIG.

なお、この発明は主として、画像処理に用い、A/D変
換器は何ビットでも使用出来る。又、輝度と色差に分け
てA/D変換するカラーと、そのままA/D変換するモ
ノクロと、どちらでも使用出来る。
Note that this invention is mainly used for image processing, and the A/D converter can be used with any number of bits. Furthermore, it is possible to use either color, which performs A/D conversion for brightness and color difference, or monochrome, which performs A/D conversion directly.

〔発明の効果〕〔Effect of the invention〕

以上のようにこの発明によれば、A/D変換器の出力を
一定時間保持し、時間を遅らせて出力するタイミング調
整回路と、基準電圧に含まれている雑音を検出し、この
検出にもとづいてA/D変換器の出力と、上記タイミン
グ調整回路の出力との選択を行う選択回路とを備えたの
で、基準電圧の雑音を利用して、ディジタル的に雑音を
取り除く事ができる。
As described above, according to the present invention, there is provided a timing adjustment circuit that holds the output of the A/D converter for a certain period of time and outputs it with a delay, and a timing adjustment circuit that detects the noise contained in the reference voltage, and based on this detection. Since the present invention includes a selection circuit that selects between the output of the A/D converter and the output of the timing adjustment circuit, it is possible to digitally remove noise using the noise of the reference voltage.

【図面の簡単な説明】[Brief explanation of drawings]

第1図はこの発明の一実施例によるA/D変換器の構成
図、第2図はこの発明の動作を示すタイムチャート図、
第3図は従来のA/D変換器の構成図である。 1・・・A/D変換器、IA・・・タイミング調整回路
、2・・・基準電圧発生器、12・・・選択回路。 尚、図中、同一符号は同一、又は相当部分を示す。 代理人  大  岩  増  雄(ほか2名)Cつ 憾
FIG. 1 is a configuration diagram of an A/D converter according to an embodiment of the present invention, and FIG. 2 is a time chart diagram showing the operation of the present invention.
FIG. 3 is a block diagram of a conventional A/D converter. DESCRIPTION OF SYMBOLS 1... A/D converter, IA... Timing adjustment circuit, 2... Reference voltage generator, 12... Selection circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent: Masuo Oiwa (and 2 others)

Claims (1)

【特許請求の範囲】 基準電圧を用いてフルスケール電圧を決定し、このフル
スケール電圧に基づいてアナログ信号をディジタル信号
に変換するA/D変換器を備えたA/D変換装置におい
て、 上記A/D変換器の出力を一定時間保持し、時間を遅ら
せて出力するタイミング調整回路と、上記基準電圧に含
まれている雑音を検出し、この検出にもとづいてA/D
変換器の出力と、上記タイミング調整回路の出力との選
択を行う選択回路とを備えたことを特徴とするA/D変
換装置。
[Scope of Claims] An A/D converter including an A/D converter that determines a full-scale voltage using a reference voltage and converts an analog signal into a digital signal based on this full-scale voltage, A timing adjustment circuit that holds the output of the A/D converter for a certain period of time and outputs it with a delay, and a timing adjustment circuit that detects noise included in the reference voltage and adjusts the A/D converter based on this detection.
An A/D conversion device comprising a selection circuit that selects between the output of the converter and the output of the timing adjustment circuit.
JP7023586A 1986-03-28 1986-03-28 Analog-digital converter Pending JPS62227221A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7023586A JPS62227221A (en) 1986-03-28 1986-03-28 Analog-digital converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7023586A JPS62227221A (en) 1986-03-28 1986-03-28 Analog-digital converter

Publications (1)

Publication Number Publication Date
JPS62227221A true JPS62227221A (en) 1987-10-06

Family

ID=13425701

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7023586A Pending JPS62227221A (en) 1986-03-28 1986-03-28 Analog-digital converter

Country Status (1)

Country Link
JP (1) JPS62227221A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02137015A (en) * 1988-11-18 1990-05-25 Nec Corp Analog/digital converter
EP1080533B1 (en) * 1998-05-20 2003-07-30 STMicroelectronics N.V. Improvements in, or relating to analogue to digital conversion
JP2017009565A (en) * 2015-06-26 2017-01-12 旭化成エレクトロニクス株式会社 Gas sensor circuit, gas sensor device, and method of sensing gas concentration

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02137015A (en) * 1988-11-18 1990-05-25 Nec Corp Analog/digital converter
EP1080533B1 (en) * 1998-05-20 2003-07-30 STMicroelectronics N.V. Improvements in, or relating to analogue to digital conversion
JP2017009565A (en) * 2015-06-26 2017-01-12 旭化成エレクトロニクス株式会社 Gas sensor circuit, gas sensor device, and method of sensing gas concentration

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