Patents by Inventor David Freeborough
David Freeborough 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: 7480345Abstract: In a polar loop based radio-communications apparatus having a phase control loop for controlling the phase of a carrier outputted from an oscillator for transmission, and an amplitude control loop for controlling the amplitude of a transmission output signal outputted from a power amplification circuit, the phase control loop is first started while maintaining the amplitude control loop in an off state at the outset of transmission, and the amplitude control loop is started after stabilizing the phase control loop.Type: GrantFiled: May 2, 2007Date of Patent: January 20, 2009Assignees: Renesas Technology Corp., TTPCOM LimitedInventors: Noriyuki Kurakami, Patrick Wurm, Robert Astle Henshaw, David Freeborough
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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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Publication number: 20070201580Abstract: In a polar loop based radio-communications apparatus having a phase control loop for controlling the phase of a carrier outputted from an oscillator for transmission, and an amplitude control loop for controlling the amplitude of a transmission output signal outputted from a power amplification circuit, the phase control loop is first started while maintaining the amplitude control loop in an off state at the outset of transmission, and the amplitude control loop is started after stabilizing the phase control loop.Type: ApplicationFiled: May 2, 2007Publication date: August 30, 2007Inventors: Noriyuki Kurakami, 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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Patent number: 7230997Abstract: In a polar loop based radio-communications apparatus having a phase control loop for controlling the phase of a carrier outputted from an oscillator for transmission, and an amplitude control loop for controlling the amplitude of a transmission output signal outputted from a power amplification circuit, the phase control loop is first started while maintaining the amplitude control loop in an off state at the outset of transmission, and the amplitude control loop is started after stabilizing the phase control loop.Type: GrantFiled: February 26, 2003Date of Patent: June 12, 2007Assignees: Hitachi, Ltd., TTPCom LimitedInventors: Noriyuki Kurakami, Patrick Wurm, Robert Astle Henshaw, David Freeborough
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Publication number: 20060293001Abstract: Disclosed is an apparatus for mobile communication system capable of constructing a system such as a mobile phone by setting a voltage corresponding to the characteristic variation of a PA even when a PA having characteristic variation is used. The mobile phone is the one employing the polar loop method, which comprises an antenna (1) for transmission and reception of signal waves; an antenna switch (2) for switching the transmission mode and the reception mode; a BBLSI (3) having a function to control the transmission and reception; an RFIC (4) having a function for modulating and demodulating the transmitted and received signals; and a PA (5) for amplifying up to the target output power by means of the amplitude modulation at the time of the transmission, wherein a bias voltage corresponding to the characteristic variation of the PA is set and supplied by a BIASDAC (6) formed of a register and a DAC so as to achieve the target output power at the time of the amplitude modulation in the PA.Type: ApplicationFiled: August 28, 2006Publication date: December 28, 2006Inventors: Kazuhisa Okada, Kazuhiko Hikasa, Patrick Wurm, 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: 7110730Abstract: A mobile communication system has a mobile phone in which a voltage is set corresponding to the characteristic variation of a PA even when a PA having characteristic variation is used. The mobile phone employs a polar loop method, which comprises an antenna (1) for transmission and reception of signal waves; an antenna switch (2) for switching the transmission mode and the reception mode; a BBLSI (3) having a function to control the transmission and reception; an RFIC (4) having a function for modulating and demodulating the transmitted and received signals; and a PA (5) for amplifying up to the target output power by means of the amplitude modulation at the time of the transmission.Type: GrantFiled: February 26, 2003Date of Patent: September 19, 2006Assignees: Hitachi, Ltd., TTP Com LimitedInventors: Kazuhisa Okada, Kazuhiko Hikasa, Patrick Wurm, David Freeborough
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Publication number: 20060189285Abstract: A polar-loop wireless communication apparatus includes, on a forward path between an amplitude detector and a power amplifier which constitute an amplitude control loop, a variable gain amplifier and a switch to change characteristics of a loop filter to output a frequency bandwidth of the amplitude control loop to an order less than an order for normal operation. The system is operated with the characteristics set to the lower order to measure outputs from the power amplifier to calibrate the output power of the power transmitter, and the register is operated with the characteristics set to the higher order to measure the open loop gain of the amplitude control. According to results of the calculation, data to correct gain characteristics of the variable gain amplifier with respect to an output control signal is stored in a nonvolatile memory of a baseband circuit.Type: ApplicationFiled: April 21, 2006Publication date: August 24, 2006Inventors: Ryoichi Takano, Kenji Toyota, 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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Patent number: 7082290Abstract: A polar-loop wireless communication apparatus includes, on a forward path between an amplitude detector and a power amplifier which constitute an amplitude control loop, a variable gain amplifier and a switch to change characteristics of a loop filter to output a frequency bandwidth of the amplitude control loop to an order less than an order for normal operation. The system is operated with the characteristics set to the lower order to measure outputs from the power amplifier to calibrate the output power of the power transmitter, and the register is operated with the characteristics set to the higher order to measure the open loop gain of the amplitude control. According to results of the calculation, data to correct gain characteristics of the variable gain amplifier with respect to an output control signal is stored in a nonvolatile memory of a baseband circuit.Type: GrantFiled: February 26, 2003Date of Patent: July 25, 2006Assignees: Renesas Technology Corp., TTPCOM LimitedInventors: Ryoichi Takano, Kenji Toyota, Patrick Wurm, Robert Astle Henshaw, David Freeborough
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Patent number: 7072625Abstract: An antenna circuit for a mobile telecommunication device. The circuit comprises a power amplifier for amplifying, in use, a signal to be transmitted. An antenna transmits signals output from the power amplifier. Switching means introduces, dependent upon the gain setting of the power amplifier, an attenuator between the output of the power amplifier and the antenna.Type: GrantFiled: July 9, 2002Date of Patent: July 4, 2006Assignee: TTPCOM LimitedInventors: Robert Astle Henshaw, David Freeborough, Patrick Wurm
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Publication number: 20040198273Abstract: Disclosed is an apparatus for mobile communication system capable of constructing a system such as a mobile phone by setting a voltage corresponding to the characteristic variation of a PA even when a PA having characteristic variation is used. The mobile phone is the one employing the polar loop method, which comprises an antenna (1) for transmission and reception of signal waves; an antenna switch (2) for switching the transmission mode and the reception mode; a BBLSI (3) having a function to control the transmission and reception; an RFIC (4) having a function for modulating and demodulating the transmitted and received signals; and a PA (5) for amplifying up to the target output power by means of the amplitude modulation at the time of the transmission, wherein a bias voltage corresponding to the characteristic variation of the PA is set and supplied by a BIASDAC (6) formed of a register and a DAC so as to achieve the target output power at the time of the amplitude modulation in the PA.Type: ApplicationFiled: February 26, 2003Publication date: October 7, 2004Inventors: Kazuhisa Okada, Kazuhiko Hikasa, Patrick Wurm, David Freeborough
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Publication number: 20040198257Abstract: A polar-loop wireless communication apparatus includes, on a forward path between an amplitude detector and a power amplifier which constitute an amplitude control loop, a variable gain amplifier and a switch to change characteristics of a loop filter to output a frequency bandwidth of the amplitude control loop to an order less than an order for normal operation. The system is operated with the characteristics set to the lower order to measure outputs from the power amplifier to calibrate the output power of the power transmitter, and the register is operated with the characteristics set to the higher order to measure the open loop gain of the amplitude control. According to results of the calculation, data to correct gain characteristics of the variable gain amplifier with respect to an output control signal is stored in a nonvolatile memory of a baseband circuit.Type: ApplicationFiled: February 26, 2003Publication date: October 7, 2004Inventors: Ryoichi Takano, Kenji Toyota, 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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Publication number: 20030223510Abstract: In a polar loop based radio-communications apparatus having a phase control loop for controlling the phase of a carrier outputted from an oscillator for transmission, and an amplitude control loop for controlling the amplitude of a transmission output signal outputted from a power amplification circuit, the phase control loop is first started while maintaining the amplitude control loop in an off state at the outset of transmission, and the amplitude control loop is started after stabilizing the phase control loop.Type: ApplicationFiled: February 26, 2003Publication date: December 4, 2003Inventors: Noriyuki Kurakami, Patrick Wurm, Robert Astle Henshaw, David Freeborough
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Publication number: 20030013422Abstract: An antenna circuit for a mobile telecommunication device. The circuit comprises a power amplifier for amplifying, in use, a signal to be transmitted. An antenna transmits signals output from the power amplifier. Switching means introduces, dependent upon the gain setting of the power amplifier, an attenuator between the output of the power amplifier and the antenna.Type: ApplicationFiled: July 9, 2002Publication date: January 16, 2003Inventors: Robert Astle Henshaw, David Freeborough, Patrick Wurm