Abstract:
An imaging device having phototransistors in photodetectors of pixels is disclosed. The imaging device includes an implanted electrode configured to separate the pixels, a first emitter disposed at a position adjacent to the implanted electrode, and a second emitter disposed such that a distance from the implanted electrode to the second emitter is longer than a distance from the implanted electrode to the first emitter.
Abstract:
A voltage clamp circuit includes a power supply, a first element connected with the power supply to output a constant current, a third element configured to allow a current to pass through when a voltage of a predetermined value or more is applied; and a second element configured to output a voltage according to a voltage generated by the first and third elements.
Abstract:
Provided is a method of varying the gain of an amplifying photoelectric conversion device and a variable gain photoelectric conversion device which are capable of achieving both signal processing under low illuminance and high-current processing under high light intensity, and thereby capable of securing a wide dynamic range. An amplifying photoelectric conversion part includes a photoelectric conversion element and amplification transistors forming a Darlington circuit. The sources and the drains of field-effect transistors are connected to the bases and the emitters of the amplification transistors, respectively. The gates of the field-effect transistors each function as a gain control part.
Abstract:
A sense circuit includes a differential amplifier circuit including an inverting input section, a non-inverting input section and an output section, an electrical capacitor connected between the inverting input section and the output section, and a field effect transistor including a source, a drain, and a gate. One of the source and the drain is connected to the inverting input section, and the other of the source and the drain is connected to the output section. A reference potential is supplied to the non-inverting input section, and an output section of a photoelectric conversion cell having an added switching function is connected to the inverting input section.
Abstract:
A voltage clamp circuit includes a power supply, a first element connected with the power supply to output a constant current, a third element configured to allow a current to pass through when a voltage of a predetermined value or more is applied; and a second element configured to output a voltage according to a voltage generated by the first and third elements.
Abstract:
A voltage regulator is disclosed that includes an output transistor outputting a current according to an input control signal to an output terminal; a control circuit part controlling the operation of the output transistor; a switching circuit part connecting the substrate gate and the gate of the output transistor to one of the input terminal and the output terminal and one of the output of the control circuit part and the output terminal, respectively, in accordance with the relationship in magnitude between a voltage at an input terminal and a voltage at the output terminal; a first rectifier element connected between the input terminal and a power supply end; and a second rectifier element connected between the output terminal and the power supply end.
Abstract:
A constant current circuit includes first and second depression type MOS transistors having drains connected to a high electric potential side; and first, second, and third enhanced type MOS transistors having sources connected to a low electric potential side.
Abstract:
A voltage regulator having a MOS transistor driver includes a p-channel MOS transistor at a voltage input terminal Vin and a p-channel MOS transistor at a voltage output terminal Vout. A drain of the input side p-channel MOS transistor is connected to the voltage input terminal Vin. A threshold voltage or a voltage lower than the threshold voltage is applied to a gate of the input side p-channel MOS transistor. A drain of the output side p-channel MOS transistor is connected to the voltage output terminal Vout. A current flowing through the input side p-channel MOS transistor drives a voltage regulator circuit and the output side p-channel MOS transistor.
Abstract:
A current sensing circuit for sensing an output current generated by a voltage regulator includes a first double-diffused metal-oxide semiconductor transistor and a current-voltage converter. The first double-diffused metal-oxide semiconductor transistor has a first gate terminal to receive an output control signal from a control circuit of the voltage regulator. The first double-diffused metal-oxide semiconductor transistor is configured to output a current proportional to the output current according to the output control signal. The current-voltage converter is connected to the first double-diffused metal-oxide semiconductor transistor. The current-voltage converter is configured to convert the proportional current to a corresponding voltage.
Abstract:
A voltage regulator is disclosed that includes an output transistor outputting a current according to an input control signal to an output terminal; a control circuit part controlling the operation of the output transistor; a switching circuit part connecting the substrate gate and the gate of the output transistor to one of the input terminal and the output terminal and one of the output of the control circuit part and the output terminal, respectively, in accordance with the relationship in magnitude between a voltage at an input terminal and a voltage at the output terminal; a first rectifier element connected between the input terminal and a power supply end; and a second rectifier element connected between the output terminal and the power supply end.