Amplifying type solid-state imaging apparatus and method for driving the same
First Claim
1. An amplifying type solid-state imaging apparatus, comprising:
- an amplifying type photoelectric conversion device comprising;
a transistor formed on a surface of a semiconductor substrate, said transistor accumulating a charge generated by incident light as a signal charge in a charge accumulation region proximate to the surface of said semiconductor substrate and outputting a signal in accordance with said accumulated signal charge; and
a resetting means provided adjacent to said transistor, said resetting means performing a resetting operation wherein said signal charge accumulated in said transistor is discharged from said charge accumulation region based on an applied voltage;
a signal line for carrying a signal output from said transistor of said amplifying type photoelectric conversion device;
a clamp circuit connected to said signal line, for clamping the voltage of said signal line at a first voltage;
a sample hold circuit connected to said clamp circuit, for sample-holding a difference signal representing a difference between said first voltage and a second voltage output from said transistor after said resetting operation;
an output line connected to said sample hold circuit; and
a controlling circuit for controlling said clamp circuit and said sample hold circuit and for reading out said difference signal held in said sample hold circuit to said output line.
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Accused Products
Abstract
An amplifying type solid-state imaging apparatus includes an amplifying type photoelectric conversion device. The device including a transistor for accumulating a charge generated by incident light as a signal charge in a charge accumulation region proximate to the surface of the semiconductor substrate and for outputting a signal in accordance with the accumulated signal charge, and a resetting section provided adjacent to the transistor for performing a resetting operation. The signal charge accumulated in the transistor is discharged from the charge accumulation region based on an applied voltage. The device further includes a signal line for carrying a signal output from the transistor, a clamp circuit for clamping the voltage of the signal line at a first voltage, a sample hold circuit for sample-holding a difference signal representing a difference between the first voltage and a second voltage output from the transistor after the resetting operation, an output line connected to the sample hold circuit, and a controlling circuit for controlling the clamp circuit and the sample hold circuit and for reading out the difference signal held in the sample hold circuit to the output line.
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Citations
17 Claims
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1. An amplifying type solid-state imaging apparatus, comprising:
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an amplifying type photoelectric conversion device comprising;
a transistor formed on a surface of a semiconductor substrate, said transistor accumulating a charge generated by incident light as a signal charge in a charge accumulation region proximate to the surface of said semiconductor substrate and outputting a signal in accordance with said accumulated signal charge; and
a resetting means provided adjacent to said transistor, said resetting means performing a resetting operation wherein said signal charge accumulated in said transistor is discharged from said charge accumulation region based on an applied voltage;a signal line for carrying a signal output from said transistor of said amplifying type photoelectric conversion device; a clamp circuit connected to said signal line, for clamping the voltage of said signal line at a first voltage; a sample hold circuit connected to said clamp circuit, for sample-holding a difference signal representing a difference between said first voltage and a second voltage output from said transistor after said resetting operation; an output line connected to said sample hold circuit; and a controlling circuit for controlling said clamp circuit and said sample hold circuit and for reading out said difference signal held in said sample hold circuit to said output line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An amplifying type solid-state imaging apparatus, comprising:
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an amplifying type photoelectric conversion device comprising;
a first region provided in a semiconductor substrate so as to include a part of a surface of said semiconductor substrate, for accumulating a charge generated by photoelectric conversion as a signal charge;a first drain region which is a high impurity concentration layer formed in said first region;
a first gate region including a surface-proximate portion of said substrate of said first region excluding said first drain region, an insulating film formed on said first region, and a first electrode formed on said insulating film;a second gate region including a second region provided adjacent to said first gate region, and a second gate electrode provided on said second region with said insulating film being inserted therebetween; a second drain region provided to the outside of said first region and adjacent to said second region;
wherein a first transistor having said surface-proximate region of said substrate of said first region as a channel is formed between said first drain region and said semiconductor substrate, and a second transistor having a region between said first region and said second drain region as a channel is formed, a change in an operational characteristic of said first transistor which is generated by said signal charge being used as an output signal;a signal line for carrying a signal output from said transistor of said amplifying type photoelectric conversion device; a clamp circuit connected to said signal line, for clamping a voltage of said signal line at a first voltage; a sample hold circuit connected to said clamp circuit, for sample-holding a difference signal representing a difference between said first voltage and a second voltage output from said transistor after said resetting operation; an output line connected to said sample hold circuit; and a controlling circuit for controlling said clamp circuit and said sample hold circuit and for reading out said difference signal held in said sample hold circuit to said output line. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method for driving an amplifying type solid-state imaging apparatus, said amplifying type solid-state imaging apparatus comprising:
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an amplifying type photoelectric conversion device, comprising a transistor formed on a surface of a semiconductor, said transistor accumulating a charge generated by incident light as a signal charge in a charge accumulation region proximate to the surface of said semiconductor substrate and outputting a signal in accordance with said signal charge; and a signal line for carrying a signal output from said transistor;
said method comprising the steps of;outputting a signal in accordance with accumulated said signal charge from said transistor of said amplifying type photoelectric conversion device to said signal line; clamping a voltage of said signal line at a first voltage; discharging said signal charge accumulated in said transistor from said charge accumulation region, thereby outputting a second voltage from said transistor; sample-holding a difference signal representing a difference between said first voltage and said second voltage; and reading out said sample-held difference signal.
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Specification