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For the Inventor, By the Inventor

Kawasaki, Japan

Yuji Segawa

USPTO Granted Patents = 13

Average Co-Inventor Count = 2.5

ph-index = 7

Forward Citations = 191(Granted Patents)


Location History:

  • Kanagawa, JP (2002)
  • Hachioji, JP (2002)
  • Kawasaki, JP (1994 - 2003)

Company Filing History:

goldMedal12 out of 39,228 
 
Fujitsu Corporation
 patents
silverMedal1 out of 1 
 
Fugitsu Limited
 patent

Years Active: 1994-2003

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13 patents (USPTO):Explore Patents
1. 6509791 - Switched capacitor filter circuit (2003-01-21),
2. 6456170 - Comparator and voltage controlled oscillator circuit (2002-09-24),
3. 6342818 - PLL having switching circuit for maintaining lock during loss of input signal (2002-01-29),
4. 6211746 - Integration method and integration circuit offering improved signal-to-noise ratio, and voltage-controlled oscillator and frequency-voltage converter employing integration circuit (2001-04-03),
5. 6100766 - Correction circuit controlling sensitivities of an oscillator circuit (2000-08-08),
6. 6064243 - Current switch and PLL in which it is used (2000-05-16),
7. 5955925 - Digital AGC circuit (1999-09-21),
8. 5870000 - Oscillation circuit and PLL circuit using same (1999-02-09),
9. 5793257 - Oscillator having switching capacitors and phase-locked loop employing (1998-08-11),
10. 5633939 - Compander circuit (1997-05-27),
11. 5579214 - Half-wave rectifier circuit (1996-11-26),
12. 5523721 - Digitally controlled variable gain circuit (1996-06-04),
13. 5319345 - Variable resistor (1994-06-07),

Title: Innovations of Yuji Segawa

Introduction

Yuji Segawa is a prominent inventor based in Kawasaki, Japan. He holds a total of 13 patents, showcasing his significant contributions to the field of technology and engineering. His work primarily focuses on advanced electronic circuits, which have applications in various industries.

Latest Patents

One of his latest inventions is the Switched Capacitor Filter Circuit. This circuit comprises an amplifier with a variable feedback capacitance, which is adjusted based on external control signals. The design includes two switches that manage the charging and discharging of a first capacitor, while another two switches perform the same function for a second capacitor. The frequency of the signal used to switch these four switches is modulated to ensure that the beat frequency remains within a range that does not affect the cutoff frequency, while maintaining a constant ratio of frequency to capacitance.

Another notable patent is the Comparator and Voltage Controlled Oscillator Circuit. This invention features an inverter that acts as a comparator, along with a dummy inverter that possesses identical electrical characteristics. A control circuit is integrated to detect the threshold voltage of the dummy inverter, which is then used to adjust the threshold voltage of the main inverter. This adjustment is achieved by controlling the back gate voltages of the MOS transistors in both the dummy inverter and the main inverter, ensuring that the threshold voltage aligns with an external reference voltage.

Career Highlights

Throughout his career, Yuji Segawa has worked with notable companies, including Fujitsu Corporation and Fujitsu Limited. His experience in these organizations has allowed him to refine his skills and contribute to various innovative projects.

Collaborations

Yuji has collaborated with several talented individuals in the field, including Kunihiko Gotoh and Atsushi Matsuda. These partnerships have fostered a creative environment that has led to the development of groundbreaking technologies.

Conclusion

Yuji Segawa's contributions to the field of electronics through his patents and collaborations highlight his innovative spirit and dedication to advancing technology. His work continues to influence the industry and inspire future inventors.

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