Fujitsu Semiconductor Limited

Fujitsu Corporation

Fujitsu Microelectronics Limited

Masashi Kijima

Hisao Suzuki

Yoshiaki Shimizu

Kenji Ito

Ikuo Kinoshita

Hideki Shirakawa

Kota Yoshikawa

Satoru Mizuta

Youji Kawano

Motoki Shimozono

Youichi Satou

Kazuhiro Konomoto

Kota Fujitsu Limited Yoshikawa

An analog-to-digital conversion device includes: an analog-to-digital converter that receives an analog voltage and converts the analog voltage into a digital value to output the converted digital value; and an offset correction unit that arithmetically operates an offset correction value based on a first digital value and a second digital value, the first digital value being to be output from the analog-to-digital converter by the analog-to-digital converter receiving a first analog voltage, the second digital value being to be output from the analog-to-digital converter by the analog-to-digital converter receiving a second analog voltage, the second analog voltage having a voltage value different from that of the first analog voltage, in which after the arithmetic operation of the offset correction value, the analog-to-digital converter outputs a digital value obtained by subtracting the offset correction value from the converted digital value.

Analog-to-digital conversion device

An A/D converter includes a plurality of comparators that performs sampling of a plurality of reference voltages and analog input signals during a sampling time, and compares each of the plurality of reference voltages with each of the plurality of analog signals during a comparison time. The A/D converter detects bubbles in thermometer codes obtained from output signals of the plurality of comparators and adjusts a ratio of the sampling time and the comparison time of the plurality of comparators so as to reduce the bubbles.

Analog/digital converter

A D/A conversion circuit for performing D/A conversion at high speeds. The D/A conversion circuit includes a resistor string including a plurality of resistor elements connected between a low-potential power supply and a high-potential power supply. A plurality of first switch groups are connected to the connection nodes between the resistor elements for selectively outputting voltages at the connection nodes. The outputs of the switches of the first switch groups are connected in common to a corresponding one of the nodes. The plurality of nodes are connected to an output terminal of the D/A conversion circuit via a second switch group. Predetermined switches of the first switch groups are connected in parallel to third switches to apply voltages to the nodes.

A/D conversion circuit for use with low-potential and high-potential power supplies

An A/D conversion circuit including a plurality of resistor elements connected in series between a low-potential power supply and a high-potential power supply. The A/D conversion circuit includes a plurality of comparators that compare a reference voltage divided by each of the resistor elements with an analog input voltage, the comparators having a sample-and-hold function for holding a sampled analog input voltage. The plurality of comparators also include a high-order bit comparator and a low-order bit comparator having different sampling sources. The high-order bit comparator may be configured to compare the analog input voltage and one of the reference voltages to obtain a determination result. The low-order bit comparator may old the analog voltage from the time that the low-order bit comparator retrieves the analog input voltage until the low-order bit comparator performs comparison.

D/A conversion circuit and A/D conversion circuit

An organic EL device employing polymer material includes a structure in which a luminous layer formed of a polymer indicated byis put between a lower electrode and an upper electrode. Where, in the above chemical formula, Ar, Ardenote a allylene group respectively, R, R, R, Rdenote a substituent respectively, and n denotes a copolymerization ratio. Accordingly, the flatness of the luminous layer can be improved and the solubility of the luminous layer constituent material can be enhanced.

Organic luminous material and organic light-emitting device

Growing community of inventors

Kasugai, Japan

Masashi Kijima