Yoichi Tobita

Title: Innovations of Yoichi Tobita

Introduction

Yoichi Tobita is a prominent inventor based in Hyogo, Japan. He has made significant contributions to the field of electrical engineering, particularly in the development of power supply circuits. With a total of nine patents to his name, Tobita's work reflects a commitment to innovation and efficiency in electronic design.

Latest Patents

One of his latest patents is an internal power supply circuit with low power consumption. This circuit includes a first output MOS transistor that transmits a first reference voltage in a source follower mode. It also features an internal reference voltage generating circuit that produces a second reference voltage from the output voltage of the first MOS transistor. An output MOS transistor is coupled between a power supply node and an output node, operating in the source follower mode according to the second internal reference voltage. The internal reference voltage generating circuit is designed to cancel the influence of the threshold voltages of the output MOS transistor and the first MOS transistor on the internal voltage VINT at the output node. By eliminating the need for a comparing circuit, the current consumption necessary for the comparing operation is significantly reduced.

Another notable patent is a reference voltage generating circuit. In this design, an MOS transistor operates in diode mode, applying a voltage lower than the power supply voltage Vcc by the absolute value of its threshold voltage to the gate of another MOS transistor. This configuration allows the second MOS transistor to operate in a saturation region, supplying current proportional to the difference between the threshold voltages of the two MOS transistors. The design ensures that the currents flowing through both MOS transistors are equal, effectively canceling the temperature dependency of the threshold voltages. As a result, an output voltage with extremely low dependency on temperature is achieved at the output node.

Career Highlights

Yoichi Tobita is currently employed at Mitsubishi Denki Kabushiki Kaisha, where he continues to innovate in the field of electronic circuits. His work has been instrumental in advancing technologies that require efficient power management and low energy consumption.

Collaborations

Throughout his career, Tobita has collaborated with notable colleagues such as Katsumi Dosaka and Hiroyuki Yamasaki. These partnerships have contributed to the development of cutting-edge technologies and have fostered a collaborative environment for innovation.

Conclusion

Yoichi Tobita's contributions to the field of electrical engineering, particularly through his innovative patents,