Patents by Inventor Masakazu Mizokami
Masakazu Mizokami 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: 10305533Abstract: In an RFIC provided in a semiconductor device according to an embodiment, a low-noise amplifier (41) for reception and a power amplifier (11) for transmission are connected to a common antenna connection terminal (5). Between the antenna connection terminal (5) and an LNA (41), a circuit (31) is connected to be used for impedance matching, and a semiconductor switch (SW1) is connected in parallel with the circuit (31).Type: GrantFiled: August 25, 2014Date of Patent: May 28, 2019Assignee: RENESAS ELECTRONICS CORPORATIONInventors: Masakazu Mizokami, Takao Kihara
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Patent number: 10291266Abstract: A radio frequency integrated circuit includes an amplification circuit for outputting a radio frequency signal to an antenna, a balun including a first terminal, a second terminal, a third terminal, and a fourth terminal, and a variable capacitance circuit including a fifth terminal and a sixth terminal. The first terminal and the second terminal of the balun receive output signals of the amplification circuit. The third terminal and the fourth terminal of the balun are connected to the fifth terminal and the sixth terminal of the variable capacitance circuit, respectively, and the fifth terminal is connected to a radio frequency output terminal. The variable capacitance circuit includes a plurality of capacity cells that are connected in parallel between two output terminals.Type: GrantFiled: October 30, 2017Date of Patent: May 14, 2019Assignee: RENESAS ELECTRONICS CORPORATIONInventor: Masakazu Mizokami
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Patent number: 10224914Abstract: A semiconductor apparatus, includes a common mode detector circuit that receives alternating current (AC) signals in a common mode.Type: GrantFiled: March 29, 2018Date of Patent: March 5, 2019Assignee: RENESAS ELECTRONICS CORPORATIONInventors: Tomohiro Sano, Masakazu Mizokami, Kenji Toyota, Yoshikazu Furuta
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Patent number: 10063205Abstract: In a related-art semiconductor device, there is a problem that a second-order harmonic distortion originating in a power amplifier driven by a rectangular-wave signal cannot be effectively suppressed. According to an embodiment, a semiconductor device generates a transmission signal RF_OUT for driving an antenna by receiving first transmission pulses INd_P and second transmission pulses INd_N having a duty ratio lower than 50%, adjusting a phase difference between the first and second transmission pulses INd_P and INd_N to a predefined phase difference, and supplying the phase-difference-adjusted first and second transmission pulses INd_P and INd_N to a power amplifier 54.Type: GrantFiled: September 15, 2017Date of Patent: August 28, 2018Assignee: RENESAS ELECTRONICS CORPORATIONInventor: Masakazu Mizokami
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Publication number: 20180219540Abstract: A semiconductor apparatus, includes a common mode detector circuit that receives alternating current (AC) signals in a common mode.Type: ApplicationFiled: March 29, 2018Publication date: August 2, 2018Inventors: Tomohiro SANO, Masakazu MIZOKAMI, Kenji TOYOTA, Yoshikazu FURUTA
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Patent number: 9991855Abstract: In a semiconductor device, received signals of different frequency bands are input selectively to low noise amplifiers. A plurality of primary inductors are coupled between differential output nodes of the respective low noise amplifiers. A secondary inductor is provided commonly for the primary inductors, and magnetically coupled to the primary inductors. A demodulator converts a received signal transmitted from one of the primary inductors to the secondary inductor by electromagnetic induction, into a signal of a low frequency.Type: GrantFiled: February 8, 2017Date of Patent: June 5, 2018Assignee: RENESAS ELECTRONICS CORPORATIONInventor: Masakazu Mizokami
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Patent number: 9960757Abstract: A semiconductor apparatus includes a common mode detector circuit that receives differential alternating current (AC) signal; and a detector circuit.Type: GrantFiled: May 17, 2017Date of Patent: May 1, 2018Assignee: RENESAS ELECTRONICS CORPORATIONInventors: Tomohiro Sano, Masakazu Mizokami, Kenji Toyota, Yoshikazu Furuta
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Publication number: 20180115291Abstract: In a related-art semiconductor device, there is a problem that a second-order harmonic distortion originating in a power amplifier driven by a rectangular-wave signal cannot be effectively suppressed. According to an embodiment, a semiconductor device generates a transmission signal RF_OUT for driving an antenna by receiving first transmission pulses INd_P and second transmission pulses INd_N having a duty ratio lower than 50%, adjusting a phase difference between the first and second transmission pulses INd_P and INd_N to a predefined phase difference, and supplying the phase-difference-adjusted first and second transmission pulses INd_P and INd_N to a power amplifier 54.Type: ApplicationFiled: September 15, 2017Publication date: April 26, 2018Inventor: Masakazu MIZOKAMI
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Publication number: 20180054222Abstract: A radio frequency integrated circuit includes an amplification circuit for outputting a radio frequency signal to an antenna, a balun including a first terminal, a second terminal, a third terminal, and a fourth terminal, and a variable capacitance circuit including a fifth terminal and a sixth terminal. The first terminal and the second terminal of the balun receive output signals of the amplification circuit. The third terminal and the fourth terminal of the balun are connected to the fifth terminal and the sixth terminal of the variable capacitance circuit, respectively, and the fifth terminal is connected to a radio frequency output terminal. The variable capacitance circuit includes a plurality of capacity cells that are connected in parallel between two output terminals.Type: ApplicationFiled: October 30, 2017Publication date: February 22, 2018Inventor: Masakazu MIZOKAMI
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Patent number: 9843344Abstract: The present invention aims to provide a digital variable capacitance circuit, a resonant circuit, an amplification circuit, and a transmitter having a high performance. A digital variable capacitance circuit 50 according to this embodiment is a digital variable capacitance circuit including a plurality of unit capacity cells 51-0 to 51-n connected in parallel between two output terminals OUTP and OUTN, in which the unit capacity cell 51 comprises: a first capacitor Cu1 having one end connected to one output terminal OUTP; a second capacitor Cu2 that is connected in series with the first capacitor Cu1 between the two output terminals; and an NMOS transistor M1 that is connected in parallel with the second capacitor Cu2 and is controlled in accordance with a digital control signal.Type: GrantFiled: June 20, 2016Date of Patent: December 12, 2017Assignee: RENESAS ELECTRONICS CORPORATIONInventor: Masakazu Mizokami
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Publication number: 20170244442Abstract: In an RFIC provided in a semiconductor device according to an embodiment, a low-noise amplifier (41) for reception and a power amplifier (11) for transmission are connected to a common antenna connection terminal (5). Between the antenna connection terminal (5) and an LNA (41), a circuit (31) is connected to be used for impedance matching, and a semiconductor switch (SW1) is connected in parallel with the circuit (31).Type: ApplicationFiled: August 25, 2014Publication date: August 24, 2017Inventors: Masakazu MIZOKAMI, Takao KIHARA
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Patent number: 9680457Abstract: A semiconductor apparatus that can detect the amplitude level of harmonics is provided. A semiconductor apparatus includes a common mode detector circuit that detects alternating current (AC) signals in a common mode, and a detector circuit that detects the amplitude level of an even-order harmonic output from the common mode detector circuit. The common mode detector circuit combines the AC signals being differential signals in common mode, thereby cancelling out odd-order harmonics to obtain direct current and even-order harmonics. The detector circuit detects the amplitude level of the even-order harmonics from a signal obtained by the common mode detection, and outputs the detected amplitude level.Type: GrantFiled: September 4, 2015Date of Patent: June 13, 2017Assignee: RENESAS ELECTRONICS CORPORATIONInventors: Tomohiro Sano, Masakazu Mizokami, Kenji Toyota, Yoshikazu Furuta
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Publication number: 20170149393Abstract: In a semiconductor device, received signals of different frequency bands are input selectively to low noise amplifiers. A plurality of primary inductors are coupled between differential output nodes of the respective low noise amplifiers. A secondary inductor is provided commonly for the primary inductors, and magnetically coupled to the primary inductors. A demodulator converts a received signal transmitted from one of the primary inductors to the secondary inductor by electromagnetic induction, into a signal of a low frequency.Type: ApplicationFiled: February 8, 2017Publication date: May 25, 2017Inventor: Masakazu MIZOKAMI
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Patent number: 9602065Abstract: In a semiconductor device, received signals of different frequency bands are input selectively to low noise amplifiers. A plurality of primary inductors are coupled between differential output nodes of the respective low noise amplifiers. A secondary inductor is provided commonly for the primary inductors, and magnetically coupled to the primary inductors. A demodulator converts a received signal transmitted from one of the primary inductors to the secondary inductor by electromagnetic induction, into a signal of a low frequency.Type: GrantFiled: September 8, 2015Date of Patent: March 21, 2017Assignee: RENESAS ELECTRONICS CORPORATIONInventor: Masakazu Mizokami
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Publication number: 20170063405Abstract: The present invention aims to provide a digital variable capacitance circuit, a resonant circuit, an amplification circuit, and a transmitter having a high performance. A digital variable capacitance circuit 50 according to this embodiment is a digital variable capacitance circuit including a plurality of unit capacity cells 51-0 to 51-nconnected in parallel between two output terminals OUTP and OUTN, in which the unit capacity cell 51 comprises: a first capacitor Cu1 having one end connected to one output terminal OUTP; a second capacitor Cu2 that is connected in series with the first capacitor Cu1 between the two output terminals; and an NMOS transistor M1 that is connected in parallel with the second capacitor Cu2 and is controlled in accordance with a digital control signal.Type: ApplicationFiled: June 20, 2016Publication date: March 2, 2017Inventor: Masakazu MIZOKAMI
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Publication number: 20160072490Abstract: A semiconductor apparatus that can detect the amplitude level of harmonics is provided. A semiconductor apparatus 10 includes a common mode detector circuit 11 that detects AC signals in a common mode, and a detector circuit 12 that detects the amplitude level of an even-order harmonic output from the common mode detector circuit 11. The common mode detector circuit 11 combines AC signals being differential signals in common mode, thereby cancelling out odd-order harmonics to obtain direct current and even-order harmonics. The detector circuit 12 detects the amplitude level of the even-order harmonics from a signal obtained by the common mode detection, and outputs the detected amplitude level.Type: ApplicationFiled: September 4, 2015Publication date: March 10, 2016Inventors: Tomohiro SANO, Masakazu Mizokami, Kenji Toyota, Yoshikazu Furuta
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Publication number: 20160072443Abstract: In a semiconductor device, received signals of different frequency bands are input selectively to low noise amplifiers. A plurality of primary inductors are coupled between differential output nodes of the respective low noise amplifiers. A secondary inductor is provided commonly for the primary inductors, and magnetically coupled to the primary inductors. A demodulator converts a received signal transmitted from one of the primary inductors to the secondary inductor by electromagnetic induction, into a signal of a low frequency.Type: ApplicationFiled: September 8, 2015Publication date: March 10, 2016Inventor: Masakazu MIZOKAMI
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Patent number: 8618879Abstract: A variable gain amplifier circuit includes output nodes, a plurality of amplifiers, and a detection circuit. The amplifiers are coupled in parallel with each other between the output nodes and a reference node and selectively assume an operating state in accordance with a control signal. The detection circuit outputs a detection signal according to the magnitude of an input signal to each amplifier. Each amplifier includes a first transistor, a second transistor, and a bias circuit. The first transistor receives, at its control electrode, the input signal or a signal proportional to the input signal. The second transistor is series-coupled to the first transistor between the first reference node and an output node. The bias circuit applies a DC voltage of a magnitude according to the detection signal to a control electrode of the second transistor.Type: GrantFiled: January 27, 2012Date of Patent: December 31, 2013Assignee: Renesas Electronics CorporationInventors: Masakazu Mizokami, Kazuaki Hori
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Patent number: 8571496Abstract: A semiconductor device for transmitting-signal amplification which has a fine resolution, a high dynamic range, a small occupied area, and low power consumption, is realized. An input signal amplitude is reduced every one half by a ladder network, and a transconductance amplifier stage is arranged corresponding to each node of the ladder network. An output of the transconductance amplifier stage is coupled to an output signal line in common. According to a control word WC<21:0>, the transconductance amplifier stage is enabled selectively, and the output current which appears in the output signal line is added.Type: GrantFiled: March 10, 2010Date of Patent: October 29, 2013Assignee: Renesas Electronics CorporationInventors: Masakazu Mizokami, Takaya Maruyama, Kazuaki Hori
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Patent number: 8320854Abstract: A semiconductor device for transmitting-signal amplification which has a fine resolution, a high dynamic range, a small occupied area, and low power consumption, is realized. An input signal amplitude is reduced every one half by a ladder network, and a transconductance amplifier stage is arranged corresponding to each node of the ladder network. An output of the transconductance amplifier stage is coupled to an output signal line in common. According to a control word WC<21:0>, the transconductance amplifier stage is enabled selectively, and the output current which appears in the output signal line is added.Type: GrantFiled: March 10, 2010Date of Patent: November 27, 2012Assignee: Renesas Electronics CorporationInventors: Masakazu Mizokami, Takaya Maruyama, Kazuaki Hori