JPH0319429A - A/d converter - Google Patents

A/d converter

Info

Publication number
JPH0319429A
JPH0319429A JP15349789A JP15349789A JPH0319429A JP H0319429 A JPH0319429 A JP H0319429A JP 15349789 A JP15349789 A JP 15349789A JP 15349789 A JP15349789 A JP 15349789A JP H0319429 A JPH0319429 A JP H0319429A
Authority
JP
Japan
Prior art keywords
signal
circuit
converter
polarity
bit
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
JP15349789A
Other languages
Japanese (ja)
Inventor
Takahiro Arakawa
荒川 隆浩
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.)
Seiko Epson Corp
Original Assignee
Seiko Epson 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 Seiko Epson Corp filed Critical Seiko Epson Corp
Priority to JP15349789A priority Critical patent/JPH0319429A/en
Publication of JPH0319429A publication Critical patent/JPH0319429A/en
Pending legal-status Critical Current

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  • Analogue/Digital Conversion (AREA)

Abstract

PURPOSE:To output a data of (n+1)-bit by deciding the polarity of bipolar input signals, converting the signal into a monopolar signal so as to apply A/D conversion with a parallel comparison n-bit A/D converter with a single power supply. CONSTITUTION:One of two signals outputted from an input circuit 2 enters an absolute value conversion circuit 3, and a negative signal component in a bipolar signal is converted into a positive polarity to apply absolute value conversion. An output signal from the absolute value conversion circuit 3 enters a parallel comparison n-bit A/D converter circuit 5. A control circuit 6 receives an n-bit data signal from the A/D converter 5 and a polarity signal from a polarity deciding circuit 4 and adds 1 bit to the n-bit data signal simply and outputs the result as an (n+1)-bit data signal when the polarity signal is negative. Thus, the A/D conversion is applied with the resolution of (n+1)-bit.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、A/Dコンバータに関する。[Detailed description of the invention] [Industrial application field] The present invention relates to an A/D converter.

[従来の技術] 従来、A/D変換したい信号が両極性の場合、単電源の
A/DコンバータにおいてはA/Dコンバータに入力す
る前にA/Dコンバータの電源側に入力信号をレベル変
換して単極性の信号としてA/D変換していた。また、
両電源のA/Dコンバータにおいては入力信号をA/D
変換した後にデジタル信号をTTLレベルまたはロジッ
クレベルに変換していた。
[Prior Art] Conventionally, when the signal to be A/D converted has bipolar polarity, in a single power supply A/D converter, the level of the input signal is converted to the power supply side of the A/D converter before inputting it to the A/D converter. Then, A/D conversion was performed as a unipolar signal. Also,
In a dual power A/D converter, the input signal is
After conversion, the digital signal was converted to TTL level or logic level.

[発明が解決しようとする謀B] しかし、従来のA/Dコンバータは、単N7flのA/
Dコンバータの場合に入力信号を精度よく電源側の極性
にレベル変換することは難しい。また両電源のA/Dコ
ンバータではA/D変換を両電源で行うため二つの基準
電圧が必要となる。
[Plot B that the invention attempts to solve] However, the conventional A/D converter is a single N7fl A/D converter.
In the case of a D converter, it is difficult to accurately convert the level of an input signal to the polarity of the power supply side. Further, in an A/D converter with dual power supplies, two reference voltages are required because A/D conversion is performed using both power supplies.

そこで本発明は、従来のこのような問題点を解決するた
め、両極性の入力信号を極性を判定するとともに単極性
の信号に変換することで、単74.′f!!.の並列比
較型nピットA/DコンバータによりA/D変換を行い
、極性判定の1ピットを加えn十1ピットのデータを出
力するA/Dコンバータを提供することにある. [ 謀題 を解決するための手段] 本発明のA/Dコンバータは、第1図のブロック図に示
すように入力信号を二系統に分ける機能をもつ入力回路
2と、両極性の信号を単極性の信号にする絶対値変換回
路3と、両極性の信号の極性を判定する極性判定回路4
と、信号をデジタル信号に変換する並列比較型のnピッ
トA/Dコンバータ回路5と、判定回路の結果によりA
/Dコンパータ回路の出力信号に1ピットを加えてn+
1ピットのデータを出力する制御回路6とからなること
を特徴とする. [実施例] 以下に本発明の実施例を図面にもとづき説明する。
In order to solve these conventional problems, the present invention determines the polarity of a bipolar input signal and converts it into a unipolar signal. 'f! ! .. An object of the present invention is to provide an A/D converter that performs A/D conversion using a parallel comparison type n-pit A/D converter, adds one pit for polarity determination, and outputs data of n11 pits. [Means for Solving the Problem] As shown in the block diagram of FIG. 1, the A/D converter of the present invention includes an input circuit 2 having a function of dividing an input signal into two systems, and a single circuit for dividing bipolar signals into two systems. An absolute value conversion circuit 3 that converts a polar signal into a polar signal, and a polarity determination circuit 4 that determines the polarity of a bipolar signal.
, a parallel comparison type n-pit A/D converter circuit 5 that converts the signal into a digital signal, and A based on the results of the judgment circuit.
/D converter circuit output signal by adding 1 pit to n+
It is characterized by comprising a control circuit 6 that outputs data of one pit. [Examples] Examples of the present invention will be described below based on the drawings.

第1図において、入力回路2、絶対値変換回路3、極性
判定回路4は十側と一側の電源を使用する両電源動作の
回路であり、A/Dコンバータ回路5と制御回路6は十
例だけの電源を使用する単電源動作の回路である.入力
1から入力された両極性のアナログ信号は入力回路2に
入る。この入力回路2はバッファアンプまたは一定のゲ
インで入力信号を増幅するゲインアンプなどで構成され
、また隆に続く絶対値変換回路3と極性判定回路4のた
めに信号を二系統に分ける機能を持つ。入力回路2から
二系統出力された信号のひとつは絶対値変換回路3に入
り、両極性の信号は負極性側の信号成分を正極性側に変
換することで絶対値変換される.絶対値変換回路3の出
力信号はA/Dコンバータ回路5に入る。ここで使用さ
れるA/Dコンバータは、A/D変換の分解能をnピッ
トとすると、(2のn乗−1)個のコンバレー夕を入力
段に並列に接続し、入力電圧範囲をラダー抵抗により2
のn乗等分した電圧にしたがって基準電圧を分割し、コ
ンバレー夕によりアナログの入力信号とこの分割された
基準電圧とを比較することでデジタル信号に変換する並
列比較方式のA/Dコンバータである。単電源動作の並
列比較型nビッ}A/Dコンバータ5では基準電圧をG
NDレベルから正極性側の一定の電圧に設定し、信号を
nピットの分解能でA/D変換する.変換されたデジタ
ル信号は制御回路6に送られる.入力回路2から出力さ
れた信号のもう一方は極性判定回路4に入る。この極性
判定回路4ではゼロクロスコンパレー夕などにより、G
NDレベルを境に入力された信号の極性を判定する。判
定結果により極性信号はTTLレベル、またはロジック
レベルにレベル変換された後、制御回路6に送られる.
制御回路6ではA/Dコンバータからのnピットデータ
信号と極性判定回路4からの極性信号を受け、極性信号
が負極性を示すものであった場合には単純にnピットデ
ータ信号に1ピットを加えてn千1ピットのデータ18
号とし出力する、またはnピットデータ信号と極性信号
をデコーダを通して所望のコードに変換する.このn+
1ピットデータ信号は、両極性の入力信号をn+1ピッ
ト分解能のA/D変換を行ったのと同様のデータ信号と
なる。
In FIG. 1, an input circuit 2, an absolute value conversion circuit 3, and a polarity determination circuit 4 are dual power supply operation circuits that use power supplies on both sides, and an A/D converter circuit 5 and a control circuit 6 are This is a single power supply operation circuit that uses only the example power supply. A bipolar analog signal input from input 1 enters input circuit 2. This input circuit 2 is composed of a buffer amplifier or a gain amplifier that amplifies the input signal with a constant gain, and also has the function of dividing the signal into two systems for the absolute value conversion circuit 3 and polarity determination circuit 4 that follow the ridge. . One of the two signals output from the input circuit 2 enters the absolute value conversion circuit 3, where the bipolar signal is converted into absolute value by converting the signal component on the negative polarity side to the positive polarity side. The output signal of the absolute value conversion circuit 3 enters the A/D converter circuit 5. The A/D converter used here has (2 to the nth power - 1) converters connected in parallel to the input stage, and the input voltage range is set by a ladder resistor, assuming that the resolution of A/D conversion is n pits. By 2
This is a parallel comparison type A/D converter that divides the reference voltage according to the voltage equally divided to the nth power, and converts it into a digital signal by comparing the analog input signal and this divided reference voltage using a converter. . In the single-power supply operation parallel comparison type n-bit A/D converter 5, the reference voltage is
Set to a constant voltage on the positive polarity side from the ND level, and A/D convert the signal with a resolution of n pits. The converted digital signal is sent to the control circuit 6. The other signal output from the input circuit 2 enters the polarity determination circuit 4. This polarity determination circuit 4 uses a zero cross comparator etc. to
The polarity of the input signal is determined with the ND level as the boundary. Depending on the determination result, the polarity signal is level-converted to TTL level or logic level, and then sent to the control circuit 6.
The control circuit 6 receives the n-pit data signal from the A/D converter and the polarity signal from the polarity determination circuit 4, and if the polarity signal indicates negative polarity, simply adds one pit to the n-pit data signal. In addition, n11 pit data 18
output as a code, or convert the n-pit data signal and polarity signal to the desired code through a decoder. This n+
The 1-pit data signal is a data signal similar to that obtained by performing A/D conversion on a bipolar input signal with n+1 pit resolution.

以上のような実施例において、ブロック図によって説明
したが、ブロック毎の回路の組み合わせで構成しても、
また全てをIC化しても、同様に逍用できることは言う
までもない。
Although the above embodiments have been explained using block diagrams, even if they are configured by combining circuits for each block,
It goes without saying that even if everything is integrated into ICs, it can be used in the same way.

[発明の効果] 以上述べたように、本発明は単電源動作の並列比較型n
ピットA/Dコンパータを用いて両極性のアナログ信号
をA/D変換することを可能とした。また、本発明は両
極性のアナログ信号をA/D変換するための基準電圧を
正負両極に設定することなく、正極性側に設定すればい
いことを可能とした。また、本発明はnピットのA/D
コンバータを用いてn+1ピットの分解能でA/D変換
することを可能とした。
[Effects of the Invention] As described above, the present invention provides a parallel comparison type n
It has become possible to A/D convert bipolar analog signals using a pit A/D converter. Furthermore, the present invention has made it possible to set the reference voltage for A/D conversion of a bipolar analog signal to the positive polarity side without having to set it to both positive and negative polarities. In addition, the present invention provides an n-pit A/D
Using a converter, it became possible to perform A/D conversion with a resolution of n+1 pits.

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

第1図は本発明のA/Dコンバータの構成を示すブロッ
ク図。 1・・・入力 2・・・入力回路 3・・・絶対値変換回路 4・・・極性判定回路 5・・・A/Dコンバータ回路 6・・・制御回路 7・・・出力
FIG. 1 is a block diagram showing the configuration of an A/D converter according to the present invention. 1... Input 2... Input circuit 3... Absolute value conversion circuit 4... Polarity judgment circuit 5... A/D converter circuit 6... Control circuit 7... Output

Claims (1)

【特許請求の範囲】[Claims]  A/Dコンバータにおいて、入力信号を2系統に分け
る機能をもつ入力回路と、両極性の信号を単極性の信号
にする絶対値変換回路と、両極性の信号の極性を判定す
る極性判定回路と、信号をデジタル信号に変換する並列
比較型のnピットA/Dコンバータ回路と、判定回路の
結果によりA/Dコンバータ回路の出力信号に1ピット
を加えてn+1ピットのデータを出力する制御回路をも
つことを特徴とするA/Dコンバータ。
An A/D converter has an input circuit that has the function of dividing an input signal into two systems, an absolute value conversion circuit that converts a bipolar signal into a unipolar signal, and a polarity determination circuit that determines the polarity of a bipolar signal. , a parallel comparison type n-pit A/D converter circuit that converts the signal into a digital signal, and a control circuit that adds 1 pit to the output signal of the A/D converter circuit and outputs data of n+1 pits based on the result of the judgment circuit. An A/D converter characterized by:
JP15349789A 1989-06-15 1989-06-15 A/d converter Pending JPH0319429A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15349789A JPH0319429A (en) 1989-06-15 1989-06-15 A/d converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15349789A JPH0319429A (en) 1989-06-15 1989-06-15 A/d converter

Publications (1)

Publication Number Publication Date
JPH0319429A true JPH0319429A (en) 1991-01-28

Family

ID=15563854

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15349789A Pending JPH0319429A (en) 1989-06-15 1989-06-15 A/d converter

Country Status (1)

Country Link
JP (1) JPH0319429A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015004590A (en) * 2013-06-21 2015-01-08 多摩川精機株式会社 Interface circuit
JP2015050617A (en) * 2013-09-02 2015-03-16 多摩川精機株式会社 A/d conversion method and device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015004590A (en) * 2013-06-21 2015-01-08 多摩川精機株式会社 Interface circuit
JP2015050617A (en) * 2013-09-02 2015-03-16 多摩川精機株式会社 A/d conversion method and device

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