Fujitsu Corporation

Fujitsu Semiconductor Limited

Kabushiki Kaisha Meidensha

Nippon Kogaku K.k.

Chikara Tsuchiya

Masatoshi Kokubun

Shinya Udo

Katsuya Ishikawa

Hidenobu Ito

Katsuyosi Yamamoto

Hidekiyo Ozawa

Hideki Kato

Kazuo Asakawa

Hideki Yoshizawa

Yoshiaki Sano

Eiji Nishimori

Hiroki Iciki

Takashi Kawasaki

Hiromu Iwamoto

Yoshihide Sugiura

Toshiharu Matsuda

Hiroyuki Tsuzuki

Takao Watanabe

Morihito Hasegawa

Jun Funakoshi

Yasuhiro Hashimoto

Kazunari Matsumoto

Mutsuo Hayashi

Takashi Matsui

Hideichi Endo

Takashi Matsumoto

Osamu Maida

Yasushige Ogawa

Kyuichi Takimoto

Toshitaka Mizuguchi

Toshio Hanazawa

Seiji Yamagata

Kimitoshi Niratsuka

Takumi Kawai

Masaru Matsubayashi

Katsuyoshi Otsu

Hirofumi Dogome

Hideo Honda

Hideichi Endoh

Harumi Handa

Hiroshi Takakusagi

A semiconductor apparatus includes: a first transistor; a second transistor having a higher withstand voltage than the first transistor, a source of the second transistor coupled to a drain of the first transistor, a gate of the second transistor coupled to a source of the first transistor; a third transistor having a higher withstand voltage than the first transistor and a drain of the third transistor coupled to a drain of the second transistor; and a comparator that compares a source voltage of the first transistor with a source voltage of the third transistor, and controls a gate voltage of the first transistor.

Active rectifying apparatus

A DC-DC converter for controlling the order for providing a semiconductor integrated circuit device with a plurality of power supply voltages. A switch control circuit controls activation and inactivation of a transistor of the switch circuit based on the comparison result of a first voltage and a reference voltage and a notification signal provided to the switch control circuit. The switch control circuit generates a second voltage that is higher than the first voltage when the first voltage is higher than the reference voltage and the notification signal indicates that other semiconductor integrated circuit devices are ready to operate.

Power supply circuit for providing semiconductor integrated circuit device with a plurality of power supply voltages

A DC-DC converter prevents through current from flowing in an output transistor. A first transistor receives an input voltage. A second transistor is connected to the first transistor. A comparator is connected to the second transistor. The comparator detects current flowing through a choke coil based on the potential difference between two terminals of the second transistor to generate a switching control signal for turning the second transistor on and off. The second transistor and the comparator form an ideal diode. A control circuit of the DC-DC converter generates an activation signal for turning the first transistor on and off based on a pulse signal to keep an output voltage constant. A through current prevention pulse generation circuit generates a pulse signal for turning off the second transistor from before the first transistor is turned on to after the first transistor is turned on.

DC-DC converter and control circuit for DC-DC converter

A differential amplifying circuitincludes a current mirror circuit having first and second current ends to which drains of MOS transistors Mand Mare respectively connected, and a pair of differential MOS transistors Mand Mhaving gates between which a switch SWis connected. A reference potential Vref is applied to the gate of the MOS transistors M. A switch SWis connected between the output VO of an output buffer circuitand the gate of a MOS transistor M, and a switch SWis connected between the output VO and the gate of the MOS transistor M. During the offset-cancel preparation period, the switches SWand SWare on and the switch SWis off. Next, the switches SWto SWare turned over, consequently outputting offset-canceled potential VO.

Offset cancel circuit of voltage follower equipped with operational amplifier

A reduced-size bipolar supply voltage generator which produces a positive and negative voltages from a unipolar power source. A single inductor is employed for current switching operation, where electric energy supplied from a power source is stored in magnetic form, and the stored magnetic energy is released as electric energy. A first and second diodes are connected to first and second ends of the inductor, respectively. The inductor is grounded at the first end via a first switch, while its second end is connected to the power source via a second switch. A switching controller activates both switches to energize the inductor. It then deactivates the first switch alone, thus directing the inductor's energy to the positive voltage output through the first diode. The controller may turn off the second switch alone after energizing the inductor. The stored energy now appears at the negative voltage output through the second diode.

Bipolar supply voltage generator and semiconductor device for same

The invention relates to an X-Y address type solid-state image pickup device manufactured by a CMOS process, and has an object to provide an X-Y address type solid-state image pickup device in which a chip area is not increased, manufacturing costs are suppressed, and an image averaging processing can be carried out. Pixel regions Pmn are arranged in a matrix form in regions defined by horizontal selection lines RWm and vertical selection lines CLn. Each of the pixel regions Pmn includes a photodiodea source follower amplifierfor converting an electric charge of the photodiodeinto a voltage and amplifying it to output image data, and a horizontal selection transistorfor outputting the image data to a predetermined one of the vertical selection lines CLn. An amplifier/noise cancel circuithas a built-in image averaging circuit for carrying out an averaging processing of the image data outputted from at least two of the plurality of the pixel regions Pmn.

X-Y address type solid-state image pickup device with an image averaging circuit disposed in the noise cancel circuit

A CMOS image sensor that reduces kTC noise in a wide band. A pixel circuit corresponding to one pixel includes a photoelectric conversion element for carrying out the photoelectric conversion of incident light, a reset transistor for resetting a cathode of the photoelectric conversion element to initial voltage, an amplifying transistor for converting electric charges accumulated in the photoelectric conversion element to voltage, and a row selection transistor for selecting signals output from pixel areas arranged in a row direction. A voltage control circuit controls the potential of a gate of the reset transistor during a period when the photoelectric conversion element is reset to change ON-state resistance of the reset transistor. By doing so, a cutoff frequency for a low-pass filter formed in the pixel circuit by ON-state resistance of the reset transistor and parasitic capacitance produced at the cathode on the photoelectric conversion element will be controlled.

CMOS image sensor with voltage control circuit

A DC-DC converter for generating power supply voltage differing from input voltage, while operating a semiconductor circuit at a predetermined speed regardless of differences between devices or changes in the operation environment. An output voltage control circuit compares an oscillation signal, which is provided from a ring oscillator of the semiconductor circuit, with a triangular wave signal, which is provided from an oscillator of the DC-DC converter, and changes the output voltage of the DC-DC converter in accordance with the comparison result. This substantially equalizes the oscillation signal of the ring oscillator with the triangular wave signal, which functions as a reference signal, and operates the semiconductor circuit at a speed that is in accordance with the triangular wave signal.

Control circuit for DC-DC converter in semiconductor integrated circuit device

The CMOS sensor circuit comprises a photodiode, a reset transistor resetting the photodiode to an initial voltage, and a voltage control circuit controlling a gate potential of the reset transistor to a potential other than power source potentials. The voltage control circuit consists of an inverter circuit driving a gate of the reset transistor. The inverter circuit includes a P-channel MOS transistor, an N-channel MOS transistor, and a transistor inserted between a drain of the P-channel MOS transistor and a drain of the N-channel MOS transistor so as to control a blooming.

CMOS sensor circuit having a voltage control circuit controlling a gate potential of a photodiode reset transistor to a potential other than power source potentials

A DC/DC converter enabling an increase in frequency. The DC/DC converter includes a main transistor, a synchronization transistor, a control circuit, which controls the main transistor and the synchronization transistor, and a capacitor, which is charged to generate gate voltage for the main transistor. The control circuit includes a charging time setting circuit for setting the activation time of the main transistor and the synchronization transistor.

DC/DC converter

The invention relates to an X-Y address type solid-state image pickup device manufactured by a CMOS process, and has an object to provide an X-Y address type solid-state image pickup device which has a small element size and a wide opening ratio, and can reduce a kTC noise. A photodiodea reset transistora source follower amplifierand a horizontal selection transistorare formed in each of pixel regions Pmn. A kTC noise reduction circuitVRfor reducing a kTC noise and a CDS circuitCLare formed outside of the pixel regions Pmn. A differential amplifier is constituted by a first differential transistorof the kTC noise reduction circuitVRand the source follower amplifierin each of the pixel regions Pmn.

Image sensor

An A/D converter includes a plurality of comparators, each of which samples an analog input potential during a first period, and compares the analog input potential with a reference potential during a second period, an encoder which encodes comparison results obtained by the comparators, and a control signal supply unit which generates one or more control signals that define the first period and the second period such as to make a duration of the first period different from a duration of the send period, and supplies the one or more control signals to the plurality of comparators.

A/D converter with reduced power consumption

In a solid state image pickup apparatus, a read bus consists of, for instance, four lines of split buses and one line of integrated bus. This integrated bus can be connected to the four lines of split buses. Electrical connection between the integrated bus and each of the split buses is selected by a corresponding switching element. Thus, the number of switching elements connected to one split bus can be reduced and hence the capacitance of the split bus can be reduced. This allows pixel signals to be read out at a higher speed.

Solid state image pickup apparatus having a plurality of split buses

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Kawasaki, Japan

Chikara Tsuchiya