Digitally-calibrated ctia image sensor pixel
AssigneeSony Semiconductor Solutions Corporation
InventorEric Bohannon
Life of this patent
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Abstract
A pixel circuit includes a photoelectric conversion device; an amplifier including a first amplifier transistor and a second amplifier transistor connected in series between a first voltage and a second voltage, wherein a gate terminal of the first amplifier transistor is connected to the photoelectric conversion device; a feedback capacitor connected between a first current terminal of the first amplifier transistor and the photoelectric conversion device; a first reset switch connected between the gate terminal of the first amplifier transistor and an anode voltage; and a second reset switch connected between a first current terminal of the second amplifier transistor and a gate terminal of the second amplifier transistor.
Claims20
A pixel circuit, comprising:
- a photoelectric conversion device;
- an amplifier including a first amplifier transistor and a second amplifier transistor connected in series between a first voltage and a second voltage, wherein a gate terminal of the first amplifier transistor is connected to the photoelectric conversion device;
- a feedback capacitor connected between a first current terminal of the first amplifier transistor and the photoelectric conversion device;
- a first reset switch connected between the gate terminal of the first amplifier transistor and an anode voltage;
- and
- a second reset switch connected between a first current terminal of the second amplifier transistor and a gate terminal of the second amplifier transistor.
A method of operating a pixel circuit comprising a photoelectric conversion device, an amplifier including a first amplifier transistor and a second amplifier transistor connected in series between a first voltage and a second voltage, a gate terminal of the first amplifier transistor being connected to the photoelectric conversion device, a feedback capacitor connected between a first current terminal of the first amplifier transistor and the photoelectric conversion device, a first reset switch connected between the gate terminal of the first amplifier transistor and an anode voltage, and a second reset switch connected between a first current terminal of the second amplifier transistor and a gate terminal of the second amplifier transistor, the method comprising:
- placing the first reset switch in an open state thereof;
- and
- subsequently, placing the second reset switch in an open state thereof.
Dependencies are inferred from the claim text.