JPH0429276U - - Google Patents
Info
- Publication number
- JPH0429276U JPH0429276U JP1990069778U JP6977890U JPH0429276U JP H0429276 U JPH0429276 U JP H0429276U JP 1990069778 U JP1990069778 U JP 1990069778U JP 6977890 U JP6977890 U JP 6977890U JP H0429276 U JPH0429276 U JP H0429276U
- Authority
- JP
- Japan
- Prior art keywords
- solid
- sample
- reading device
- hold circuit
- image sensor
- 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
- 230000005669 field effect Effects 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 1
Landscapes
- Transforming Light Signals Into Electric Signals (AREA)
- Solid State Image Pick-Up Elements (AREA)
Description
第１図は本考案になる画像読取り装置用サンプ
ルホールド回路の一実施例を示す構成図、第２図
は電界効果トランジスタ（ＦＥＴ）のゲート電圧
とオン抵抗値の関係を示す図、第３図は蓄積時間
を長くした時の波形図、第４図は蓄積時間を短く
した時の波形図、第５図は従来のサンプルホール
ド回路の構成図、第６図は蓄積時間の可変により
生じる問題点を説明する波形図である。
１……固体撮像素子、２……読出しクロツク生
成回路、３……電界効果トランジスタ（ＦＥＴ）
、４……コンデンサ、６……制御電圧生成回路、
７……スイツチング用トランジスタ、８……サン
プリングパルス生成回路、Ｐ……読出し信号の一
画素の期間、Ｓ……サンプル期間、Ｈ……ホール
ド期間、Ａ……時定数に応じた（充電）期間。
FIG. 1 is a block diagram showing one embodiment of the sample hold circuit for an image reading device according to the present invention, FIG. 2 is a diagram showing the relationship between the gate voltage and on-resistance value of a field effect transistor (FET), and FIG. 3 is a waveform diagram when the accumulation time is long, Figure 4 is a waveform diagram when the accumulation time is shortened, Figure 5 is a configuration diagram of a conventional sample and hold circuit, and Figure 6 is a problem caused by varying the accumulation time. FIG. 1... Solid-state image sensor, 2... Readout clock generation circuit, 3... Field effect transistor (FET)
, 4... Capacitor, 6... Control voltage generation circuit,
7... Switching transistor, 8... Sampling pulse generation circuit, P... Period of one pixel of readout signal, S... Sample period, H... Hold period, A... (charging) period according to time constant. .
Claims (1)
てサンプルホールドする画像読取り装置用サンプ
ルホールド回路において、 前記固体撮像素子の蓄積時間に応じて、前記サ
ンプルホールドする充電の時定数を可変するよう
にしたことを特徴とする画像読取り装置用サンプ
ルホールド回路。 (2) 固体撮像素子からの読出し信号を、スイツ
チング素子によりコンデンサに充放電してサンプ
ルホールドする画像読取り装置サンプルホールド
回路において、 前記スイツチング素子を電界効果トランジスタ
で構成するとともに、 前記固体撮像素子の蓄積時間に応じて、前記電
界効果トランジスタの制御電圧を可変するように
したことを特徴とする画像読取り装置用サンプル
ホールド回路。[Claims for Utility Model Registration] (1) In a sample and hold circuit for an image reading device that charges and samples and holds a readout signal from a solid-state image sensor, the sample and hold is carried out according to the storage time of the solid-state image sensor. A sample hold circuit for an image reading device, characterized in that a charging time constant is made variable. (2) In an image reading device sample hold circuit that samples and holds a readout signal from a solid-state image sensor by charging and discharging a capacitor using a switching element, the switching element is configured with a field effect transistor, and the storage of the solid-state image sensor is A sample hold circuit for an image reading device, characterized in that a control voltage of the field effect transistor is varied according to time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990069778U JPH0429276U (en) | 1990-06-29 | 1990-06-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990069778U JPH0429276U (en) | 1990-06-29 | 1990-06-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0429276U true JPH0429276U (en) | 1992-03-09 |
Family
ID=31605378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990069778U Pending JPH0429276U (en) | 1990-06-29 | 1990-06-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0429276U (en) |
-
1990
- 1990-06-29 JP JP1990069778U patent/JPH0429276U/ja active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2000014960A1 (en) | Solid-state camera | |
| JPS6059389A (en) | Circuit for driving liquid crystal display unit | |
| JPS63272174A (en) | Imaging device | |
| JP2000022118A (en) | Imaging device | |
| JP2520162B2 (en) | Correlated double sampling circuit | |
| JPH0439779U (en) | ||
| JP3603454B2 (en) | Imaging device | |
| SU705656A1 (en) | Sawtooth voltage generator | |
| JPS56148795A (en) | Charge transfer device | |
| JPS6217278U (en) | ||
| JPS6234871U (en) | ||
| JPS6316080Y2 (en) | ||
| JPS57192178A (en) | Signal output circuit for image pickup device | |
| JPH01126779U (en) | ||
| JPS61126669U (en) | ||
| JPH01175468A (en) | Charge detecting circuit | |
| JPH02155363A (en) | Image sensor | |
| JPS6027467B2 (en) | solid-state imaging device | |
| JPS62178359U (en) | ||
| JPH0394877U (en) | ||
| JPS62157169U (en) | ||
| JPH049992U (en) | ||
| JPS6362936U (en) | ||
| JPS58105744U (en) | charging device | |
| JPH0475431U (en) |