Patents Assigned to Hiji High-Tech Co., Ltd.
-
Patent number: 7973571Abstract: The invention provides a multichannel drive circuit by which, even when there occurs a variation between channels in circuit characteristics of each channel including current source due to the semiconductor manufacturing process and the like, loads of each channel constituting a load array can be driven under conditions uniform between all the channels. The invention includes; an interchannel common connection line (5) for making conduction between respective current paths of each channel for connecting the respective current sources of each channel constituting a current source array (11) with respective input switches of each channel constituting an input switch array (13); and current blocking means (12) for blocking output current of the current source of that channel of the plurality of channels in which the input switch is in an OFF state from flowing into the interchannel common connection line.Type: GrantFiled: November 20, 2006Date of Patent: July 5, 2011Assignee: Hiji High-Tech Co., Ltd.Inventors: Tatsumi Sato, Kazuhiko Maki, Toshiyuki Wada, Takamasa Yanai
-
Patent number: 7746126Abstract: To provide a load drive circuit that has a satisfactory phase characteristic and can be realized as a low-price LSI chip. A series circuit of nonlinear resistive elements (P2 and N3) and switch elements (N2 and P3) is inserted between control input terminals (GP1 and GN1) of output elements (P1 and N1) of a final amplifier (AMP0) and an output terminal (OUT) of the load drive circuit. The nonlinear resistive element has a nonlinear characteristic in which a resistance value decreases as an applied voltage value increases and the resistance value increases as the applied voltage value decreases. The switch elements are switching-controlled to selectively come into an ON state only in a high-electric potential period or a low-electric potential period of an input signal according to whether the output element is arranged on a high-electric potential side or a low-electric potential side in the final amplifier.Type: GrantFiled: March 7, 2006Date of Patent: June 29, 2010Assignee: Hiji High-Tech Co., Ltd.Inventor: Takeda Koji
-
Publication number: 20090302898Abstract: The invention provides a multichannel drive circuit by which, even when there occurs a variation between channels in circuit characteristics of each channel including current source due to the semiconductor manufacturing process and the like, loads of each channel constituting a load array can be driven under conditions uniform between all the channels. The invention includes; an interchannel common connection line (5) for making conduction between respective current paths of each channel for connecting the respective current sources of each channel constituting a current source array (11) with respective input switches of each channel constituting an input switch array (13); and current blocking means (12) for blocking output current of the current source of that channel of the plurality of channels in which the input switch is in an OFF state from flowing into the interchannel common connection line.Type: ApplicationFiled: November 20, 2006Publication date: December 10, 2009Applicant: Hiji High-Tech Co., Ltd.Inventors: Tatsumi Sato, Kazuhiko Maki, Toshiyuki Wada, Takamasa Yanai
-
Patent number: 5675278Abstract: An output circuit of a level shifter or an operational amplifier which converts input signal voltages to different voltage levels. A pMOS transistor PT.sub.2 and nMOS transistor NT.sub.2 connected in series between the power source and ground constitute the output node ND.sub.12. A Wilson mirror is made of pMOS transistors PT.sub.3 -PT.sub.6. An nMOS transistor NT.sub.3 induces a current flow in the current mirror, and an nMOS transistor NT.sub.1 connected between the current output node ND.sub.1 of the current mirror and ground. The gate of pMOS transistor PT.sub.2 is connected to the current output node ND.sub.1, and the gates of nMOS transistor NT.sub.1 and nMOS transistors NT.sub.2 and NT.sub.3 are connected to the input line of signals IN and XIN, which are 180.degree. out of phases.Type: GrantFiled: May 29, 1996Date of Patent: October 7, 1997Assignee: Texas Instruments Incorporated/Hiji High-Tech Co., Ltd.Inventors: Shinichi Tanaka, Takehiro Takayanagi, Yasuhisa Uchida