JP4280196B2 - サンプルホールド回路 - Google Patents
サンプルホールド回路 Download PDFInfo
- Publication number
- JP4280196B2 JP4280196B2 JP2004135672A JP2004135672A JP4280196B2 JP 4280196 B2 JP4280196 B2 JP 4280196B2 JP 2004135672 A JP2004135672 A JP 2004135672A JP 2004135672 A JP2004135672 A JP 2004135672A JP 4280196 B2 JP4280196 B2 JP 4280196B2
- Authority
- JP
- Japan
- Prior art keywords
- operational amplifier
- sample
- switch
- hold
- hold 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.)
- Expired - Fee Related
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- Analogue/Digital Conversion (AREA)
- Amplifiers (AREA)
Description
(1)アンプの位相補正量を動作モードによって切り換える機能を有する。
(2)位相補正用のコンデンサの容量を可変する機能を有する、あるいはアンプのオープンループゲインを制御する機能を有する。
(3)差動アンプの電流源を動作モードによって可変し、相互コンダクタンスGmを変えて位相補正コンデンサとの組み合わせでアンプのカットオフ周波数を変え、十分な位相補正を得る。
(4)動作モードがコンパレータモードになった場合は差動アンプの電流源を増加させ、十分なスルーレートを確保して高速のコンパレータを実現する。
S1、S2、S3:スイッチ
C:ホールドコンデンサ
Claims (1)
- サンプル用スイッチと、スイッチ手段と、ホールド用コンデンサと、オペアンプとを具備し、該サンプル用スイッチと該オペアンプの反転入力端子の間に該ホールド用コンデンサを接続し、該オペアンプの該反転入力端子と出力端子の間に該スイッチ手段を接続したサンプルホールド回路において、
該オペアンプ内に構成された入力差動アンプ部の電流源を可変として該オペアンプの帯域幅を可変とし、
サンプル時には、該オペアンプの帯域幅を狭くすると共に該スイッチ手段を閉じ、該サンプル用スイッチに供給された第1のアナログ入力信号に応じた電圧を該ホールド用コンデンサに保持するよう動作し、
ホールド時には、該オペアンプの帯域幅を広くすると共に該スイッチ手段を開き、該ホールド用コンデンサに保持された電圧に応じた電圧を該オペアンプから得られるように動作する
ことを特徴とするサンプルホールド回路。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004135672A JP4280196B2 (ja) | 2004-04-30 | 2004-04-30 | サンプルホールド回路 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004135672A JP4280196B2 (ja) | 2004-04-30 | 2004-04-30 | サンプルホールド回路 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2005317149A JP2005317149A (ja) | 2005-11-10 |
JP4280196B2 true JP4280196B2 (ja) | 2009-06-17 |
Family
ID=35444386
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2004135672A Expired - Fee Related JP4280196B2 (ja) | 2004-04-30 | 2004-04-30 | サンプルホールド回路 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP4280196B2 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014107730A (ja) | 2012-11-28 | 2014-06-09 | Yamaha Corp | 信号処理装置および増幅器 |
US10083668B2 (en) * | 2016-03-09 | 2018-09-25 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device, display device, and electronic device |
-
2004
- 2004-04-30 JP JP2004135672A patent/JP4280196B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP2005317149A (ja) | 2005-11-10 |
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