Patents by Inventor Hiroshi Hagisawa
Hiroshi Hagisawa 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).
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Patent number: 9287832Abstract: A power amplifying module includes a radio frequency amplifying circuit including an amplifying circuit configured to amplify an input signal and output an amplified signal, and a bias circuit of an emitter-follower type configured to bias the amplifying circuit to an operating point, and a constant voltage generating circuit configured to generate, from a first reference voltage, a first constant voltage applied to a base side of a transistor of the bias circuit and a second constant voltage applied to a collector side of the transistor.Type: GrantFiled: March 4, 2014Date of Patent: March 15, 2016Assignee: Murata Manufacturing Co., Ltd.Inventors: Hiroshi Hagisawa, Satoshi Sakurai
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Patent number: 8970306Abstract: The present invention improves the transmission power characteristics of a wireless communication device or reduces the resources required for improving the transmission power characteristics. The wireless communication device includes, for example, a bias detection circuit, an error amplifier, and a correction circuit. The bias detection circuit detects a bias that is supplied to a high-frequency power amplifier. The error amplifier amplifies the error between the detected bias and a predetermined reference voltage. The correction circuit searches for a bit correction value that minimizes the error detected in the error amplifier. During a normal operation, a digital-to-analog conversion circuit receives a bias instruction code from a baseband unit and outputs a bias setup voltage, which is obtained when the bit correction value is reflected in the bias instruction code. A bias corresponding to the bias setup voltage is then supplied to the high-frequency power amplifier.Type: GrantFiled: December 6, 2012Date of Patent: March 3, 2015Assignee: Renesas Electronics CorporationInventors: Hiroshi Hagisawa, Satoshi Sakurai
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Publication number: 20140253243Abstract: A power amplifying module includes a radio frequency amplifying circuit including an amplifying circuit configured to amplify an input signal and output an amplified signal, and a bias circuit of an emitter-follower type configured to bias the amplifying circuit to an operating point, and a constant voltage generating circuit configured to generate, from a first reference voltage, a first constant voltage applied to a base side of a transistor of the bias circuit and a second constant voltage applied to a collector side of the transistor.Type: ApplicationFiled: March 4, 2014Publication date: September 11, 2014Applicant: Murata Manufacturing Co., Ltd.Inventors: Hiroshi HAGISAWA, Satoshi SAKURAI
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Patent number: 7433653Abstract: A transmitter adopting a polar loop system including a phase control loop for controlling the phase of a carrier signal outputted from a transmitting oscillator and an amplitude control loop for controlling the amplitude of a transmitting output signal outputted from a power amplification circuit, and designed to be capable of performing transmission using a GMSK modulation mode and transmission using an 8-PSK modulation mode. In the transmitter, the phase control loop is shared as a phase control loop for use in the GMSK modulation mode and a phase control loop for use in the 8-PSK modulation mode. A component similar to any one of components constituting a loop filter is provided in parallel therewith so that the component can be connected or disconnected in accordance with the modulation mode, for example, by use of a switching element.Type: GrantFiled: June 18, 2007Date of Patent: October 7, 2008Assignees: Renesas Technology Corp., TTPCOM LimitedInventors: Ryoichi Takano, Kazuhiko Hikasa, Yasuyuki Kimura, Hiroshi Hagisawa, Patrick Wurm, Robert Astle Henshaw, David Freeborough
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Publication number: 20070249297Abstract: A transmitter adopting a polar loop system including a phase control loop for controlling the phase of a carrier signal outputted from a transmitting oscillator and an amplitude control loop for controlling the amplitude of a transmitting output signal outputted from a power amplification circuit, and designed to be capable of performing transmission using a GMSK modulation mode and transmission using an 8-PSK modulation mode. In the transmitter, the phase control loop is shared as a phase control loop for use in the GMSK modulation mode and a phase control loop for use in the 8-PSK modulation mode. A component similar to any one of components constituting a loop filter is provided in parallel therewith so that the component can be connected or disconnected in accordance with the modulation mode, for example, by use of a switching element.Type: ApplicationFiled: June 18, 2007Publication date: October 25, 2007Inventors: Ryoichi Takano, Kazuhiko Hikasa, Yasuyuki Kimura, Hiroshi Hagisawa, Patrick Wurm, Robert Henshaw, David Freeborough
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Patent number: 7248842Abstract: A transmitter adopting a polar loop system including a phase control loop for controlling the phase of a carrier signal outputted from a transmitting oscillator and an amplitude control loop for controlling the amplitude of a transmitting output signal outputted from a power amplification circuit, and designed to be capable of performing transmission using a GMSK modulation mode and transmission using an 8-PSK modulation mode. In the transmitter, the phase control loop is shared as a phase control loop for use in the GMSK modulation mode and a phase control loop for use in the 8-PSK modulation mode. A component similar to any one of components constituting a loop filter is provided in parallel therewith so that the component can be connected or disconnected in accordance with the modulation mode, for example, by use of a switching element.Type: GrantFiled: May 30, 2006Date of Patent: July 24, 2007Assignees: Renesas Technology Corp., Tipcom LimitedInventors: Ryoichi Takano, Kazuhiko Hikasa, Yasuyuki Kimura, Hiroshi Hagisawa, Patrick Wurm, Robert Astle Henshaw, David Freeborough
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Publication number: 20060217081Abstract: A transmitter adopting a polar loop system including a phase control loop for controlling the phase of a carrier signal outputted from a transmitting oscillator and an amplitude control loop for controlling the amplitude of a transmitting output signal outputted from a power amplification circuit, and designed to be capable of performing transmission using a GMSK modulation mode and transmission using an 8-PSK modulation mode. In the transmitter, the phase control loop is shared as a phase control loop for use in the GMSK modulation mode and a phase control loop for use in the 8-PSK modulation mode. A component similar to any one of components constituting a loop filter is provided in parallel therewith so that the component can be connected or disconnected in accordance with the modulation mode, for example, by use of a switching element.Type: ApplicationFiled: May 30, 2006Publication date: September 28, 2006Inventors: Ryoichi Takano, Kazuhiko Hikasa, Yasuyuki Kimura, Hiroshi Hagisawa, Patrick Wurm, Robert Henshaw, David Freeborough
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Patent number: 7085544Abstract: A transmitter adopting a polar loop system including a phase control loop for controlling the phase of a carrier signal outputted from a transmitting oscillator and an amplitude control loop for controlling the amplitude of a transmitting output signal outputted from a power amplification circuit, and designed to be capable of performing transmission using a GMSK modulation mode and transmission using an 8-PSK modulation mode. In the transmitter, the phase control loop is shared as a phase control loop for use in the GMSK modulation mode and a phase control loop for use in the 8-PSK modulation mode. A component similar to any one of components constituting a loop filter is provided in parallel therewith so that the component can be connected or disconnected in accordance with the modulation mode, for example, by use of a switching element.Type: GrantFiled: February 26, 2003Date of Patent: August 1, 2006Assignees: Renesas Technology Corp., TTPCOM LimitedInventors: Ryoichi Takano, Kazuhiko Hikasa, Yasuyuki Kimura, Hiroshi Hagisawa, Patrick Wurm, Robert Astle Henshaw, David Freeborough
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Publication number: 20030224740Abstract: A transmitter adopting a polar loop system including a phase control loop for controlling the phase of a carrier signal outputted from a transmitting oscillator and an amplitude control loop for controlling the amplitude of a transmitting output signal outputted from a power amplification circuit, and designed to be capable of performing transmission using a GMSK modulation mode and transmission using an 8-PSK modulation mode. In the transmitter, the phase control loop is shared as a phase control loop for use in the GMSK modulation mode and a phase control loop for use in the 8-PSK modulation mode. A component similar to any one of components constituting a loop filter is provided in parallel therewith so that the component can be connected or disconnected in accordance with the modulation mode, for example, by use of a switching element.Type: ApplicationFiled: February 26, 2003Publication date: December 4, 2003Inventors: Ryoichi Takano, Kazuhiko Hikasa, Yasuyuki Kimura, Hiroshi Hagisawa, Patrick Wurm, Robert Astle Henshaw, David Freeborough
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Patent number: 5689814Abstract: Part of a first signal path for amplifying a signal includes circuits for detecting a signal, and a second signal path connected to an input portion of the first signal path includes circuits for detecting the signal. A signal strength detector circuit adds outputs from the respective detector circuits in the first and second signal paths. The first signal path has a function of expanding the dynamic range in a smaller signal region as compared with the second signal path, while the second signal path has a function of expanding the dynamic range in a larger signal region as compared with the first signal path. When a radio transmitted output is variably controlled in a radio transmitter section based on a field strength detection output for a received signal, the transmitted output is optimized, resulting in minimizing consumed power and unnecessary radiation of radio waves.Type: GrantFiled: August 17, 1994Date of Patent: November 18, 1997Assignees: Hitachi, Ltd., Hitachi Microcomputer System, Ltd.Inventors: Hiroshi Hagisawa, Kazuo Watanabe, Kyoichi Takahashi, Kenji Takahashi, Michio Waki, Tadashi Matsuoka