Patents by Inventor Bob Henshaw

Bob Henshaw has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • PLL circuit and wireless mobile station with that PLL circuit
    Patent number: 6608510
    Abstract: The present invention provides a PLL circuit, which can make convergence at a high speed and convert an IF signal into an RF signal, and a wireless mobile station with that PLL circuit. An LPF charging constant current source, a discharging constant current source and a high-speed charging constant current source are connected to an output terminal of a phase comparator with current mode output of the PLL circuit. By doing so, in the case where a convergence frequency of the PLL circuit is low, an input voltage of a VCO is increased from 0V so as to be converged by using the constant current source. Meanwhile, in the case where the convergence frequency of the PLL circuit is high, the input voltage of the PLL circuit is temporarily increased to the maximum voltage by using the constant current source. Thereafter, the input voltage is gradually dropped from the maximum voltage so as to be converged by using the constant current source.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: August 19, 2003
    Assignees: Hitachi, Ltd., TTP Com Limited
    Inventors: Taizo Yamawaki, Satoshi Tanaka, Norio Hayashi, Kazuo Watanabe, Bob Henshaw
  • Direct-conversion transmitting circuit and integrated transmitting/receiving circuit
    Publication number: 20030092416
    Abstract: Providing a transmitter composed of a transmitting circuit that does not require a high-performance low noise VCO restricting cost reduction thereof and that can reduces the number of parts without requiring an RF filter.
    Type: Application
    Filed: February 12, 2002
    Publication date: May 15, 2003
    Inventors: Satoshi Tanaka, Masamichi Tanabe, Yasuyuki Okuma, Taizo Yamawaki, Koichi Yahagi, Hiroaki Matsui, Bob Henshaw
  • PLL circuit and wireless mobile satation with that PLL circuit
    Publication number: 20020084814
    Abstract: The present invention provides a PLL circuit, which can make convergence at a high speed and convert an IF signal into an RF signal, and a wireless mobile station with that PLL circuit.
    Type: Application
    Filed: March 30, 2001
    Publication date: July 4, 2002
    Inventors: Taizo Yamawaki, Satoshi Tanaka, Norio Hayashi, Kazuo Watanabe, Bob Henshaw
  • PLL circuit and wireless mobile station with that PLL circuit
    Publication number: 20020086652
    Abstract: The present invention provides a PLL circuit, which can make convergence at a high speed and convert an IF signal into an RF signal, and a wireless mobile station with that PLL circuit.
    Type: Application
    Filed: March 29, 2001
    Publication date: July 4, 2002
    Inventors: Taizo Yamawaki, Satoshi Tanaka, Norio Hayashi, Kazuo Watanabe, Bob Henshaw