Abstract: Non-contact charging is performed with an opposing apparatus and wireless communication is performed at a high speed with the opposing apparatus by a simple configuration, without performing a highly accurate alignment with the opposing apparatus. The wireless communication apparatus includes a non-contact charging unit and a wireless communication unit. The non-contact charging unit transmits power to the opposing apparatus through a coil in a non-contact manner. The wireless communication unit includes a plurality of antennas. A plurality of antennas are arranged at substantially regular intervals from a center of a central axis of the coil. The wireless communication unit transmits data from the respective antennas by wireless communication when the non-contact charging unit transmits power to the opposing apparatus.

Abstract: A shunt capacitor includes first and second zigzag wirings having different lengths, formed in a first wiring layer, third and second zigzag wirings having different lengths, formed in a second wiring layer, an induction device and a ground. The first and fourth zigzag wirings are connected to the induction device, and the second and third zigzag wirings are connected to the ground. The first and second zigzag wirings and the third and fourth zigzag wirings cross each other three-dimensionally.

Abstract: Non-contact charging is performed with an opposing apparatus and wireless communication is performed at a high speed with the opposing apparatus by a simple configuration, without performing a highly accurate alignment with the opposing apparatus. The wireless communication apparatus includes a non-contact charging unit and a wireless communication unit. The non-contact charging unit transmits power to the opposing apparatus through a coil in a non-contact manner. The wireless communication unit includes a plurality of antennas. A plurality of antennas are arranged at substantially regular intervals from a center of a central axis of the coil. The wireless communication unit transmits data from the respective antennas by wireless communication when the non-contact charging unit transmits power to the opposing apparatus.

Abstract: A shunt capacitor includes first and second zigzag wirings having different lengths, formed in a first wiring layer, third and second zigzag wirings having different lengths, formed in a second wiring layer, an induction device and a ground. The first and fourth zigzag wirings are connected to the induction device, and the second and third zigzag wirings are connected to the ground. The first and second zigzag wirings and the third and fourth zigzag wirings cross each other three-dimensionally.

Abstract: A transformer (101) includes four terminals (N1 to N4), and parasitic resistances (109 and 110) are present in the transformer (101). A coupling capacitor (102) is provided between the terminals (N1 and N3), and a coupling capacitor (103) is provided between the terminals (N2 and N4). Shunt capacitors (104 to 107) are respectively provided between the respective terminals (N1 to N4) and a ground. Further, a phase shifter (112) is electrically connected to the terminal (N2), and a phase shifter (113) having a phase delay larger than that of the phase shifter (112) is connected to the terminal (N3).

Abstract: A transmitter includes: a decoder for transforming an IQ signal into a linear sum of two vectors which have non-negative coefficients, respectively, which form an angle of (?/4), and which are included in eight vectors representing directions indicated by eight angles of (??/2), 0, (?/2), ?, (?3?/4), (??/4), (?/4), and (3?/4), respectively, and for outputting information upon magnitudes and angles of the two vectors; a phase generator for generating eight phase signals corresponding to phases of (??/2), 0, (?/2), ?, (?3?/4), (??/4), (?/4), and (3?/4), respectively, and outputting the eight phase signals; and a selector for selecting two phase signals having phases equivalent to angles of the two vectors, from among the eight phase signals, and amplifying the two phase signals having been selected, based on the information upon the magnitudes and the angles, and outputting, as a plurality of amplification signals, the two phase signals having been amplified.

Abstract: A transmitter includes: a decoder for transforming an IQ signal into a linear sum of two vectors which have non-negative coefficients, respectively, which form an angle of (?/4), and which are included in eight vectors representing directions indicated by eight angles of (??/2), 0, (?/2), ?, (?3?/4), (??/4), (?/4), and (3?/4), respectively, and for outputting information upon magnitudes and angles of the two vectors; a phase generator for generating eight phase signals corresponding to phases of (??/2), 0, (?/2), ?, (?3?/4), (??/4), (?/4), and (3?/4), respectively, and outputting the eight phase signals; and a selector for selecting two phase signals having phases equivalent to angles of the two vectors, from among the eight phase signals, and amplifying the two phase signals having been selected, based on the information upon the magnitudes and the angles, and outputting, as a plurality of amplification signals, the two phase signals having been amplified.

Abstract: A wireless receiver realizes multi-band and multi-mode operations while reducing power consumption of a local oscillator. The receiver includes the local oscillator for discontinuously changing a band of a local oscillation signal corresponding to a frequency band of an RF signal to be received and outputting the local oscillation signal, a frequency converter for converting the RF signal into an IF signal by using the local oscillation signal, and a demodulator for demodulating the IF signal. The local oscillator detects a frequency variation range of the local oscillation signal, obtains a frequency equivalent to an integral multiple of a symbol rate from the frequency variation range, and outputs the local oscillation signal having a local oscillatory frequency, causing a center frequency of a channel to be received, which channel is included in the intermediate frequency signal, to be equivalent to the integral multiple of the symbol rate.

Abstract: Reception signals received by first to fourth antennas 11 to 14 are sequentially selected one by one repeatedly in accordance with first to fourth switches 31 to 34 being controlled by first to fourth switch control circuits 41 to 44, respectively, so as to be inputted to a signal shaping section 60. The reception signals having been shaped by the signal shaping section 60 are sampled by a sample-and-hold section 71 and AD-converted by an AD converter 72 in accordance with a time at which the reception signals are sequentially selected. The resultant signals are converted into parallel signals by a serial-parallel conversion section 73. Thus, the parallel signals are obtained as the reception signals of the first to the fourth antennas 11 to 14.

Abstract: A radio receiving apparatus capable of making compensation for both amplitude variations and phase variations and of suppressing image interference in a short period of time is provided. A correction value calculation section combines a signal, obtained by multiplying a first digital signal by an amplitude correction candidate value and rotating the phase of the first digital signal, with a signal obtained by multiplying a second digital signal by a multiplicative inverse of the amplitude correction candidate value and performing, for the second digital signal, phase rotation which is in a quadrature relationship to phase rotation performed for the first digital signal, so as to obtain a first combined signal, obtain an inflection point of the first combined signal, and input, to a demodulation section, the amplitude correction candidate value and a phase correction candidate value, which correspond to the inflection point, as an amplitude correction value and a phase correction value, respectively.

Abstract: A current control circuit (5) recognizes whether or not a transmission signal is transmitted based on a control signal outputted from a transmission signal control circuit (4). When the transmission signal is transmitted, the current control circuit (5) controls a current flowing into a reception circuit (3) in accordance with control information representing any of at least two modes where the transmission signal is transmitted. When no transmission signal is transmitted, the current control circuit (5) controls the current flowing into the reception circuit (3) in accordance with control information representing a mode where no transmission signal is transmitted.

Abstract: A radio circuit device capable of reducing a cross-modulation interference which occurs at a reception circuit due to a transmission signal leakage is provided.

Abstract: A radio receiving apparatus capable of making compensation for both amplitude variations and phase variations and of suppressing image interference in a short period of time is provided.

Abstract: A switch circuit device with improved insertion loss characteristics and isolation characteristics is provided. The switch circuit of the present invention includes a plurality of n-ch MOSFETs whose gates are connected together and whose drains and sources are connected in series, a p-ch MOSFET whose gate is connected to the gates of the plurality of n-ch MOSFETs and whose drain is connected to the source and drain of at least one pair of adjacent n-ch MOSFETs, and a voltage changing circuit for applying a low voltage to the source of the p-ch MOSFET while a high-level control voltage is applied to the gate of the p-ch MOSFET, and a high voltage to the source of the p-ch MOSFET while a low-level control voltage is applied to the gate of the p-ch MOSFET.

Abstract: Radio communication apparatus comprising an antenna, a transmitting circuit of outputting a transmitting signal in a first frequency band. A duplexer connected to the antenna and having a single-phase input terminal and a balanced output terminal, conveying the transmitting signal inputted to the single-phase input terminal to the antenna. The duplexer outputs a receiving signal in a second frequency band different from the first frequency band received from the antenna substantially as a differential signal from the balanced output terminal. A receiving circuit connected to the balanced output terminal and having a circuit in which a gain of a signal of a differential component is higher than that of a signal of an in-phase component, or a loss of the signal of the differential component is lower than that of the signal of the in-phase component.

Abstract: A variable attenuator, used with high frequency, provides large variable attenuation per stage. The variable attenuator includes: a MOSFET having a gate, a drain, a source, and a body; an attenuation control circuit; and a temperature characteristics compensation circuit. The attenuation control circuit supplies a control voltage to the gate, the drain, and the source. The temperature characteristics compensation circuit supplies a temperature compensation voltage to the body. An input terminal and an output terminal are connected to the drain and the source of the MOSFET. The temperature characteristics compensation circuit, in accordance with an operating temperature of the MOSFET, controls a voltage to be supplied to the body and adjusts, based on a relation between a body voltage and a gate voltage, a resistance value of a current flowing between the input terminal and the output terminal.

Abstract: A variable gain amplifying apparatus has an amplifier, one or more first switching elements connected in parallel to the amplifier, and a phase shifter connected in series to the first switching element. The first switching element is enabled if the level of an input signal or an output signal is higher than a predetermined level, and the first switching element is disabled if the level of the input signal or the output signal is equal to or lower than the predetermined level. The amplifier does not operate when the first switching element is enabled, and the amplifier operates when the first switching element is disabled, and the amount of phase shift when the input signal is passed through the amplifier and phase shifter is substantially equal to the amount of phase shift when the input signal is passed through the first switching element.

Abstract: Provided is a wireless receiver capable of realizing multi-band and multi-mode operations while reducing an electric power consumption of an RF analog local oscillator. A wireless receiver (100) comprises: a local oscillator (101) for discontinuously changing a band of a local oscillation signal corresponding to a frequency band of an RF signal to be received and outputting the local oscillation signal; frequency converter (102) for converting the RF signal into an IF signal by using the local oscillation signal and outputting the IF signal; and a demodulator (103) for demodulating the IF signal.

Abstract: A current control circuit (5) recognizes whether or not a transmission signal is transmitted based on a control signal outputted from a transmission signal control circuit (4). When the transmission signal is transmitted, the current control circuit (5) controls a current flowing into a reception circuit (3) in accordance with control information representing any of at least two modes where the transmission signal is transmitted. When no transmission signal is transmitted, the current control circuit (5) controls the current flowing into the reception circuit (3) in accordance with control information representing a mode where no transmission signal is transmitted.

Abstract: A variable attenuator, used with high frequency, in which variable attenuation per stage is large, is provided. The variable attenuator includes: a MOSFET 12 having a gate, a drain, a source, and a body; an attenuation control circuit 14; and a temperature characteristics compensation circuit 21. The attenuation control circuit 14 supplies a control voltage to the gate, the drain, and the source. The temperature characteristics compensation circuit 21 supplies a temperature compensation voltage to the body. An input terminal and an output terminal are connected to the drain and the source of the MOSFET 12. The temperature characteristics compensation circuit 21, in accordance with an operating temperature of the MOSFET 12, controls a voltage to be supplied to the body and adjusts, based on a relation between a body voltage and a gate voltage, a resistance value of a current flowing between the input terminal and the output terminal.