US5335008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Imager which has a load transistor connected to each vertical signal line and wherein each load transistor comprises two field transistors connected in series
Assignee: Sony Corp
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Filing: 1992-03-09
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Granted: 1994-08-02
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Expires: 2012-03-09
Abstract
Abstract The present invention is directed to a CCD image sensing device in which an amplifying transistor for amplifying a photoelectrically-converted signal charge and outputting the amplified signal charge to a vertical signal line is provided at every pixel of a plurality of pixels arrayed in a two-dimensional fashion and a load transistor is connected to each of the vertical signal lines, in which the load transistor is composed of a first field effect transistor having a constant current characteristic and a second field effect transistor acting as a negative feedback resistor function connected in series.
Inventors
- 👤 Masaharu Hamasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:24
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/687; H10; H10F; H10F39/00; H10F39/10; H10F39/12; H10F39/15; H10F39/153; H10F39/1534; H04; H04N; H04N25/00; H04N25/70; H04N25/71; H04N25/75; H04N25/76; H04N25/78; H10F39/151
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
A CCD image sensing device in which an amplifying transistor for amplifying photoelectrically-converted signal charges and outputting the amplified signal to one of a plurality of vertical signal lines is provided at every pixel of a plurality of pixels arrayed in a two-dimensional fashion and load means is connected to each of said plurality of vertical signal lines and selectively connected as a load of said amplifying transistor, in which said load means consists of: (a) a first field effect transistor having a constant current characteristic; and (b) a second field effect transistor connected in series with said first field effect transistor and acting to provide linear operation.
Claim 2
Dependent Claim
108 words
A CCD image sensing device in which an amplifying transistor for amplifying photoelectrically-converted signal charges and outputting the amplified signal to one of a plurality of vertical signal lines is provided at every pixel of a plurality of pixels arrayed in a two-dimensional fashion and load means is connected to each of said plurality of vertical signal lines and selectively connected as a load of said amplifying transistor, in which said load means consists of: (a) a first field effect transistor having a constant current characteristic; and (b) a second field effect transistor connected in series with said first field effect transistor and acting to provide linear operation.
Claim 3
Dependent Claim
33 words
A CCD image sensing device according to claim 1, in which said first field effect transistor has a large ratio W/L where W is its channel width and L is its channel length.
Claim 4
Dependent Claim
21 words
A CCD image sensing device according to claim 2, in which said second field effect transistor has a small ratio W/L.
Claim 5
Dependent Claim
22 words
A CCD image sensing device according to claim 1, in which said load is connected between the vertical signal line and ground.
Claim 6
Dependent Claim
27 words
A CCD image sensing device according to claim 1 further including: a correlated double sampling circuit connected to one end of each of said vertical signal lines.
Claim 7
Dependent Claim
38 words
A CCD image sensing device according to claim 5 further including: a plurality of sampling hold circuits, each of which is connected to the output of the corresponding correlated double sampling circuit for producing each pixel output signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-08-01 | 1998-01-31 | 1998-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-01 | 2002-01-31 | 2002-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-01 | 2006-01-31 | 2006-08-02 | $7700.00 | Window Closed / Lapsed |