Kouichi Ishimi

Title: Kouichi Ishimi and His Patent Contributions.

Introduction

Kouichi Ishimi is an inventor associated with Hyogo, Japan, and Renesas Technology Corp. His work includes patent inventions related to clock control and voltage-controlled oscillation circuits. The supplied information lists 2 patents.

Latest Patents

Ishimi’s listed patents address circuit timing and clock generation.

- **Clock control circuit.** This invention controls the delivery of a clock signal from an oscillator to an internal circuit. While the reset signal is high, the clock passes through a gate circuit. When the reset signal becomes low, a gate control circuit stops the clock supply. This approach is designed to prevent erroneous operation when a delay in the internal circuit exceeds one clock cycle.

- **Voltage controlled oscillation circuit having easily controllable oscillation characteristic and capable of generating high frequency and low frequency internal clocks.** This invention uses a current mirror circuit with two P-channel MOS transistors to control the operating current of a ring oscillator. A control voltage and a current-mirror resistance section adjust the constant current, while a control signal changes the range of current variation. The design supports controllable oscillation characteristics and the generation of high- and low-frequency internal clocks.

Career Highlights

Ishimi’s listed patent work is associated with Renesas Technology Corp. The inventions reflect a focus on electronic circuit design, including reliable clock control and adjustable oscillation.

Collaborations

Tomohiro Sakurai is identified as Ishimi’s coworker. The supplied information does not specify whether they collaborated on either listed patent.

Conclusion

Kouichi Ishimi’s listed inventions address practical challenges in clock distribution and oscillator control, contributing to the development of electronic circuit technologies.