1
Toshihiko Shimizu, Masao Hotta, Kenji Maio: Two-step parallel analog to digital converter. Hitachi, Antonelli Terry & Wands, October 17, 1989: US04875048 (99 worldwide citation)

In a two-step parallel analog to digital converter of the type in which a first flash-type A/D converter determines the upper significant bits of a digital signal output having a desired number of bits and after a quantizing error of the first flash-type A/D converter has been determined from the di ...


2
Motohiko Morita, Kenji Maio: DA conversion circuit. Hitachi, January 21, 2003: US06509854 (76 worldwide citation)

In a DA converter wherein an analog output voltage is formed in such a way that constant currents formed by a plurality of constant-current source transistors are selectively fed to a load resistor by controlling switching means to turn ON and OFF in correspondence with input signals; each of the co ...


3
Kenji Maio, Tsuneta Sudo: D/A Conversion system with compensation circuit. Nippon Telegraph and Telephone Public Corporation, Hitachi, Craig and Antonelli, July 20, 1982: US04340882 (38 worldwide citation)

A D/A conversion system with a compensation circuit comprises a D/A converter for converting a digital input signal into an analog signal and a memory for storing a compensation data used for the compensation of the output of the D/A converter at an address corresponding to the digital input signal. ...


4
Tetsuhiko Takahashi, Hirosh Takeuch, Toshikazu Shimada, Haruo Itoh, Tadaaki Hirai, Kenji Maio, Kenichi Okajima, Minoru Yoshida, Hideaki Yamamoto: Multi-element type radiation detector. Hitachi, Antonelli Terry Stout & Kraus, January 1, 1991: US04982095 (22 worldwide citation)

This invention relates to a multi-element type radiation detector for an X-ray CT scanner system wherein a plurality of scintillator blocks that are isolated either optically or radiation-wise from one another are arranged integrally, and a photo-diode consisting of an amorphous silicon layer for co ...


5
Kenji Maio, Atsushi Moritani: Integral-type small signal input circuit. Hitachi, Hitachi Medical Corporation, Antonelli Terry & Wands, March 25, 1986: US04578646 (22 worldwide citation)

An integral-type small signal input circuit having a Miller integrator is adapted to perform cyclically an integrating operation, a resetting operation and an input offset current compensating operation. An input offset current compensation circuit which forms a feedback circuit of the amplifier in ...


6
Masao Hotta, Kenji Maio, Norio Yokozawa, Hiromi Nagaishi: Digital-to-analog converter with error compensation. Hitachi, Kenyon & Kenyon, April 26, 1983: US04381495 (21 worldwide citation)

A digital-to-analog conversion system includes a digital-to-analog converter, a source of at least one set of digital input signals and a signal for error compensation and a digital signal for error detection to the converter, a switch to selectively couple either the one set of digital input signal ...


7
Tetsuhiko Takahashi, Minoru Yoshida, Hiroshi Takeuchi, Hideji Fujii, Haruo Itho, Toshikazu Shimada, Kenji Maio: Radiation detector and manufacturing process thereof. Hitachi, Antonelli Terry Stout & Kraus, August 20, 1991: US05041729 (15 worldwide citation)

A radiation detector for use on X-ray CT scanner with a plurality of elements arrayed to form a detector block, which is structured that a plurality of thin-film photodiodes consisting of amorphous silicon each are formed on the back of a scintillator block having a width to cover the plurality of e ...


8
Akinori Shibayama, Kenji Maio, Masao Hotta, Norio Yokozawa: Digital-to-analog conversion system with compensation circuit. Nippon Telegraph & Telephone Public, Hitachi, Craig and Antonelli, February 16, 1982: US04316178 (14 worldwide citation)

In a digital-to-analog converter having means to convert a digital input signal into an analog signal, processing means to evaluate an error attendant upon the conversion, and memory means to store the evaluated error; a digital-to-analog converter with a compensating circuit wherein the processing ...


9
Takashi Oshima, Takeshi Doi, Kenji Maio, Irei Kyu: Variable gain amplifier circuit and gain control method thereof. Hitachi, Antonelli Terry Stout and Kraus, February 28, 2006: US07005922 (13 worldwide citation)

In order to rapidly control the gains of a plurality of variable gain amplifiers VGAs, each of gain control circuits is configured to determine a gain to be set therein, based on gain control information received from other gain control circuits existing in its preceding stage or stages and the sign ...


10
Toshihiko Shimizu, Masao Hotta, Kenji Maio: Analog to digital converter. Hitachi, Antonelli Terry & Wands, June 21, 1988: US04752766 (13 worldwide citation)

In an analog-to-digital converter of a parallel comparison type having a plurality of comparators for comparing an analog input voltage with different reference voltages and converting a comparison result into a digital output by means of an encoder, a plurality of comparators each having a differen ...