Patents by Inventor Kaoru Ishida

Kaoru Ishida 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).

  • Patent number: 8886246
    Abstract: When switching the mode of a power amplifier between compressed mode and uncompressed mode, accurate transmission power control is realized. A transmission power control method includes setting a power setting value of mode to switch to, such that an inter-mode output power error is canceled (equal to step ST21), calculating an intra-mode output power error from the power setting value of the mode to switch to (equal to step ST23), calculating a gain linearity value based on the power setting value of the mode to switch to and an output power error of the intra-mode (equal to step ST24), and resetting the power setting value of the mode to switch to based on the gain linearity value (equal to steps ST25 and 26).
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: November 11, 2014
    Assignee: Panasonic Corporation
    Inventors: Tomoya Urushihara, Kaoru Ishida, Akihiko Matsuoka
  • Patent number: 8879436
    Abstract: Provided is a multiband wireless apparatus that, even if the number of supported frequency bands increases, suppresses increase in the number of components, and completes cell search within a specified time. In a multiband wireless apparatus (1), a reception channel to which a current reception channel is going to be next switched is set in advance for one of a tunable duplexer (13) and a reception dedicated tunable filter (14) that is not connected to an antenna. An antenna switch (15), in a normal transmission/reception mode, connects the antenna to the tunable duplexer (13), and in a compressed mode, switches the connection of the antenna between the tunable duplexer (13) and the reception dedicated tunable filter (14).
    Type: Grant
    Filed: April 14, 2010
    Date of Patent: November 4, 2014
    Assignee: Panasonic Corporation
    Inventor: Kaoru Ishida
  • Patent number: 8860524
    Abstract: A polar modulator of the present invention includes: a first function block which generates an amplitude signal and a phase signal; a second function block which adjusts the signal delay between the amplitude signal and the phase signal; a third function block which allows the low frequency component of the amplitude signal to pass therethrough; a fourth function block which modulates the phase of the phase signal; a fifth function block which outputs a modulation voltage, based on the amplitude signal; a sixth function block which modulates the amplitude of the phase signal, based on the modulation voltage; a seventh function block which measures the temperature of at least one function block; and an eighth function block which calculates a compensation amount for the signal delay, based on the measured temperature. The second function block adjusts the signal delay, based on the compensation amount.
    Type: Grant
    Filed: June 17, 2010
    Date of Patent: October 14, 2014
    Assignee: Panasonic Corporation
    Inventors: Shigeru Morimoto, Kaoru Ishida, Maki Nakamura
  • Patent number: 8599965
    Abstract: A transmitter circuit includes a first synthesizer section, and a second synthesizer section which consumes less current than the first synthesizer section. The transmitter circuit performs switching such that the first synthesizer section is operated and the second synthesizer section is powered off in polar modulation, and the second synthesizer section is operated and the first synthesizer section is powered off in quadrature modulation, thereby reducing consumed power. While the first synthesizer section is operating, calibration for an oscillation frequency is performed, and when the operation is stopped, a calibration value is stored. When an operation of the first synthesizer section is restarted, the stored calibration value is corrected by using temperature change, thereby enhancing calibration accuracy and preventing degradation in quality of a transmission signal.
    Type: Grant
    Filed: April 7, 2010
    Date of Patent: December 3, 2013
    Assignee: Panasonic Corporation
    Inventors: Akira Kato, Kaoru Ishida
  • Patent number: 8559553
    Abstract: Provided is a transmitter apparatus including: a signal conversion section for, in polar modulation, converting input data into an amplitude-component signal and a phase-component signal, and in quadrature modulation, converting input data into an in-phase component signal and a quadrature component signal; a carrier wave generation section for outputting a carrier wave; a mixer section for, in quadrature modulation, generating a quadrature modulation signal; a regulator for, in polar modulation, outputting a supply voltage control signal; and a power amplifier for, in polar modulation, amplifying the supply voltage control signal and superimposing the resultant signal onto the carrier wave, thereby generating a transmission signal, wherein in polar modulation, the carrier wave generation section outputs the carrier wave modulated with respect to phase component, and in quadrature modulation, the carrier wave generation section outputs the carrier wave that is yet to be modulated.
    Type: Grant
    Filed: April 7, 2010
    Date of Patent: October 15, 2013
    Assignee: Panasonic Corporation
    Inventors: Yukihiro Omoto, Kaoru Ishida, Hiroshi Komori
  • Patent number: 8532591
    Abstract: A transmission circuit according to the present invention includes: an amplitude signal driving section (220) that generates a control voltage based on an amplitude signal in a high-output mode, and generates a control voltage at a predetermined level and a bias current based on the amplitude signal in a low-output mode; a variable gain adjustment section (114) that adjusts a power level of the phase signal; and a power amplifier (130) which amplitude-modulates the phase signal having the adjusted power level on the basis of the control voltage, in the high-output mode, and to a power supply terminal of which the control voltage is supplied and which amplitude-modulates the phase signal having the adjusted power level on the basis of the bias current, in the low-output mode.
    Type: Grant
    Filed: June 2, 2010
    Date of Patent: September 10, 2013
    Assignee: Panasonic Corporation
    Inventors: Mikihiro Shimada, Ryo Kitamura, Kaoru Ishida, Hiroshi Komori
  • Patent number: 8515367
    Abstract: Provided is a transmission circuit capable of compensating a variation in output power caused due to a temperature change or an individual variability when the operation mode is switched without an increase in the size of the transmission circuit which switches the operation mode between a linear operation mode and a nonlinear operation mode, and capable of suppressing the deterioration of the quality of a transmission signal. In the transmission circuit, a gain setting section (160) sets the gain (target gain) of a variable gain amplifier (140), to a value which enables the variable gain amplifier (140) to operate linearly and corresponds to a comparison result (output error level) obtained through comparison between the target level of the variable gain amplifier (140) corresponding to the set power level of the transmission signal and the power level of an output signal of the variable gain amplifier (140) detected by a power detection section (150).
    Type: Grant
    Filed: May 13, 2011
    Date of Patent: August 20, 2013
    Assignee: Panasonic Corporation
    Inventors: Maki Nakamura, Kaoru Ishida
  • Patent number: 8442153
    Abstract: A transmission circuit (100) according to the present invention includes an RF-IC (110), an EM-IC (120), and a power amplifier (130). The EM-IC (120) includes a DC-DC converter (123), a transistor (124), a low-dropout regulator (121), and a regulator output selector switch (122). After an elapse of a predetermined time from a time when an operation mode of the transmission circuit has switched from a polar modulation mode to a quadrature modulation mode to a time when a power supply voltage for the quadrature modulation mode output from the DC-DC converter (123) stabilizes at a desired value, the regulator output selector switch (122) switches a connection destination of a gate of the transistor (124) to a fixed potential, and outputs as a control voltage the power supply voltage for the quadrature modulation mode output from the DC-DC converter (123).
    Type: Grant
    Filed: May 19, 2010
    Date of Patent: May 14, 2013
    Assignee: Panasonic Corporation
    Inventors: Mikihiro Shimada, Kaoru Ishida, Hiroshi Komori
  • Patent number: 8396432
    Abstract: A transmitter circuit is provided which is capable of reducing modulation distortion even when an output power of a power amplifying section 141 is low. A signal generation section 11 generates an amplitude signal and a phase signal. A regulator 12 outputs a current based on the amplitude signal. A phase modulation section 13 phase-modulates the phase signal, and outputs a phase-modulated signal. The power amplifying section 141 receives the current which is based on the amplitude signal and supplied as a bias current from the regulator 12, and amplifies the phase-modulated signal by using the supplied current. Further, to the power amplifying section 141, a predetermined DC voltage is supplied as a collector voltage.
    Type: Grant
    Filed: April 1, 2010
    Date of Patent: March 12, 2013
    Assignee: Panasonic Corporation
    Inventors: Ryo Kitamura, Kaoru Ishida, Mikihiro Shimada, Hiroshi Komori
  • Patent number: 8369802
    Abstract: The polar modulation apparatus of the present invention can control the output power of a transmission signal over a wide range and compensate characteristic degradation reliably upon temperature change. Polar modulation transmission apparatus 100 is provided with: temperature sensor 120; temperature compensation section 160-1 that corrects an amplitude signal and performs temperature compensation for transmission power amplification section 190; temperature compensation section 160-2 that corrects a power amplification signal and performs temperature compensation for power adjustment section 180; and correction value setting section 130 that sets correction values for temperature compensation section 160-1 and temperature compensation section 160-2, and, while only the amplitude signal is corrected according to a measurement result in temperature sensor 120 in the first mode, the amplitude signal and the power adjustment signal are corrected according to a measurement result in the second mode.
    Type: Grant
    Filed: April 9, 2009
    Date of Patent: February 5, 2013
    Assignee: Panasonic Corporation
    Inventors: Maki Nakamura, Kaoru Ishida
  • Publication number: 20120184263
    Abstract: A radio transmission apparatus according to the present invention detects an output current of a power supply section that varies in response to a variation of the output impedance of an amplification section, and corrects a distortion of the input/output characteristic of the amplification section by using an LUT corresponding to the detected output current. In addition, a threshold used for switching an LUT is caused to be different depending on a switching direction between LUTs, thereby suppressing frequent occurrence of switching of the LUT.
    Type: Application
    Filed: March 29, 2012
    Publication date: July 19, 2012
    Inventors: Takatoshi KAWAI, Kaoru ISHIDA
  • Patent number: 8223886
    Abstract: A transmission circuit switches a bias circuit without allowing a power amplifier to enter a non-bias state. A first bias circuit supplies a first bias signal to a power amplifier, and a second bias circuit supplies a second bias signal to the power amplifier. A first delay circuit delays the switching of an operation of the first bias circuit using a first delay time, and a second delay circuit delays the switching of an operation of the second bias circuit using a second delay time. The first bias circuit and the second bias circuit are both simultaneously operated for a predefined time period, in order to prevent a transistor for amplification from entering a non-bias state when switching an operation mode of the power amplifier.
    Type: Grant
    Filed: May 27, 2009
    Date of Patent: July 17, 2012
    Assignee: Panasonic Corporation
    Inventors: Ryo Kitamura, Kaoru Ishida
  • Patent number: 8219050
    Abstract: A radio transmission apparatus according to the present invention detects an output current of a power supply section that varies in response to a variation of the output impedance of an amplification section, and corrects a distortion of the input/output characteristic of the amplification section by using an LUT corresponding to the detected output current. In addition, a threshold used for switching an LUT is caused to be different depending on a switching direction between LUTs, thereby suppressing frequent occurrence of switching of the LUT.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: July 10, 2012
    Assignee: Panasonic Corporation
    Inventors: Takatoshi Kawai, Kaoru Ishida
  • Patent number: 8219043
    Abstract: A radio transmission apparatus according to the present invention detects an output current of a power supply section that varies in response to a variation of the output impedance of an amplification section, and corrects a distortion of the input/output characteristic of the amplification section by using an LUT corresponding to the detected output current. In addition, a threshold used for switching an LUT is caused to be different depending on a switching direction between LUTs, thereby suppressing frequent occurrence of switching of the LUT.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: July 10, 2012
    Assignee: Panasonic Corporation
    Inventors: Takatoshi Kawai, Kaoru Ishida
  • Publication number: 20120163500
    Abstract: Provided is a transmitter apparatus including: a signal conversion section for, in polar modulation, converting input data into an amplitude-component signal and a phase-component signal, and in quadrature modulation, converting input data into an in-phase component signal and a quadrature component signal; a carrier wave generation section for outputting a carrier wave; a mixer section for, in quadrature modulation, generating a quadrature modulation signal; a regulator for, in polar modulation, outputting a supply voltage control signal; and a power amplifier for, in polar modulation, amplifying the supply voltage control signal and superimposing the resultant signal onto the carrier wave, thereby generating a transmission signal, wherein in polar modulation, the carrier wave generation section outputs the carrier wave modulated with respect to phase component, and in quadrature modulation, the carrier wave generation section outputs the carrier wave that is yet to be modulated.
    Type: Application
    Filed: April 7, 2010
    Publication date: June 28, 2012
    Inventors: Yukihiro Omoto, Kaoru Ishida, Hiroshi Komori
  • Publication number: 20120140852
    Abstract: A transmitter circuit includes a first synthesizer section, and a second synthesizer section which consumes less current than the first synthesizer section. The transmitter circuit performs switching such that the first synthesizer section is operated and the second synthesizer section is powered off in polar modulation, and the second synthesizer section is operated and the first synthesizer section is powered off in quadrature modulation, thereby reducing consumed power. While the first synthesizer section is operating, calibration for an oscillation frequency is performed, and when the operation is stopped, a calibration value is stored. When an operation of the first synthesizer section is restarted, the stored calibration value is corrected by using temperature change, thereby enhancing calibration accuracy and preventing degradation in quality of a transmission signal.
    Type: Application
    Filed: April 7, 2010
    Publication date: June 7, 2012
    Inventors: Akira Kato, Kaoru Ishida
  • Publication number: 20120114075
    Abstract: A transmission circuit (100) according to the present invention includes an RF-IC (110), an EM-IC (120), and a power amplifier (130). The EM-IC (120) includes a DC-DC converter (123), a transistor (124), a low-dropout regulator (121), and a regulator output selector switch (122). After an elapse of a predetermined time from a time when an operation mode of the transmission circuit has switched from a polar modulation mode to a quadrature modulation mode to a time when a power supply voltage for the quadrature modulation mode output from the DC-DC converter (123) stabilizes at a desired value, the regulator output selector switch (122) switches a connection destination of a gate of the transistor (124) to a fixed potential, and outputs as a control voltage the power supply voltage for the quadrature modulation mode output from the DC-DC converter (123).
    Type: Application
    Filed: May 19, 2010
    Publication date: May 10, 2012
    Inventors: Mikihiro Shimada, Kaoru Ishida, Hiroshi Komori
  • Publication number: 20120106402
    Abstract: A polar modulator of the present invention includes: a first function block which generates an amplitude signal and a phase signal; a second function block which adjusts the signal delay between the amplitude signal and the phase signal; a third function block which allows the low frequency component of the amplitude signal to pass therethrough; a fourth function block which modulates the phase of the phase signal; a fifth function block which outputs a modulation voltage, based on the amplitude signal; a sixth function block which modulates the amplitude of the phase signal, based on the modulation voltage; a seventh function block which measures the temperature of at least one function block; and an eighth function block which calculates a compensation amount for the signal delay, based on the measured temperature. The second function block adjusts the signal delay, based on the compensation amount.
    Type: Application
    Filed: June 17, 2010
    Publication date: May 3, 2012
    Inventors: Shigeru Morimoto, Kaoru Ishida, Maki Nakamura
  • Publication number: 20120106403
    Abstract: A transmission circuit according to the present invention includes: an amplitude signal driving section (220) that generates a control voltage based on an amplitude signal in a high-output mode, and generates a control voltage at a predetermined level and a bias current based on the amplitude signal in a low-output mode; a variable gain adjustment section (114) that adjusts a power level of the phase signal; and a power amplifier (130) which amplitude-modulates the phase signal having the adjusted power level on the basis of the control voltage, in the high-output mode, and to a power supply terminal of which the control voltage is supplied and which amplitude-modulates the phase signal having the adjusted power level on the basis of the bias current, in the low-output mode.
    Type: Application
    Filed: June 2, 2010
    Publication date: May 3, 2012
    Inventors: Mikihiro Shimada, Ryo Kitamura, Kaoru Ishida, Hiroshi Komori
  • Publication number: 20120108187
    Abstract: A transmitter circuit is provided which is capable of reducing modulation distortion even when an output power of a power amplifying section 141 is low. A signal generation section 11 generates an amplitude signal and a phase signal. A regulator 12 outputs a current based on the amplitude signal. A phase modulation section 13 phase-modulates the phase signal, and outputs a phase-modulated signal. The power amplifying section 141 receives the current which is based on the amplitude signal and supplied as a bias current from the regulator 12, and amplifies the phase-modulated signal by using the supplied current. Further, to the power amplifying section 141, a predetermined DC voltage is supplied as a collector voltage.
    Type: Application
    Filed: April 1, 2010
    Publication date: May 3, 2012
    Inventors: Ryo Kitamura, Kaoru Ishida, Mikihiro Shimada, Hiroshi Komori