Abstract: An ESD protection device having high insulation reliability and good discharge properties is provided. In producing an ESD protection device that includes a first discharge electrode and a second discharge electrode arranged to oppose each other, a discharge supporting electrode formed so as to span between the first and second discharge electrodes, and an insulator substrate that retains the first and second discharge electrodes and the discharge supporting electrode, a paste for forming a discharge supporting electrode is used and this paste contains, in addition to a powder of an alkali metal compound and/or an alkaline earth metal compound, a metal powder with a network-forming oxide adhered to particle surfaces, a metal powder and a semiconductor powder with a network-forming oxide adhered to particle surfaces, or a metal powder with a network-forming oxide adhered to particle surfaces and a semiconductor powder with a network-forming oxide adhered to particle surfaces.

Abstract: In a wireless communication device, baseband variable gain amplifiers amplify a baseband signal. Mixers convert the amplified baseband signal into a high-frequency transmission signal. Hybrid variable gain amplifiers amplify an in-phase local signal and an orthogonal local signal which are input to the mixers. The level detection controller changes respective gains of the baseband variable gain amplifiers and the hybrid variable gain amplifiers, in response to power of the high-frequency transmission signal.

Abstract: An ESD protective device is provided which can lower a discharge start voltage. In an ESD protective device 1, first and second discharge electrodes 3 and 4 are disposed in a substrate 2 in a spaced relation with a discharge gap G interposed therebetween, and a conductor 9 is arranged around the discharge gap G. The conductor 9 has a nonlinear sectional shape in a section of the substrate 2 extending in a direction interconnecting a first principal surface 2a and a second principal surface 2b of the substrate 2 and passing the discharge gap G.

Abstract: A wireless communication device of the present disclosure has: a transmitter having a plurality of transmission circuit branches; a receiver having a plurality of reception circuit branches; a transmission phase switch; a reception phase switch; and a phase/transmission-reception controller, and has a beam-forming function. When phase switching is performed during a plurality of training packets for setting directivity, the phase/transmission-reception controller controls the transmission phase switch and the reception phase switch by setting a same phase for each of m (m being an integer of 2 or more) number of continuous training packets. In addition, the phase/transmission-reception controller performs control such that the transmission of the transmitter and the reception of the receiver are set to an OFF state in at least one or more training packets from the beginning of the m number of continuous training packets.

Abstract: There is provided an ESD protection device capable of lowering a discharge starting voltage. An ESD protection device 1 includes a ceramic multilayer substrate 2, a first discharge electrode 4 and a second discharge electrode 5 arranged at a height position of the ceramic multilayer substrate, an end 4a of the first discharge electrode 4 and an end 5a of the second discharge electrode 5 facing each other, in which each of the first discharge electrode 4 and the second discharge electrode 5 contains a metal and a shrinkage suppression material having a lower rate of shrinkage than that of the metal at a temperature at which firing for the production of the ceramic multilayer substrate 2 is performed.

Abstract: A variable gain amplifier amplifies a baseband signal. A quadrature modulator quadrature-modulates the amplified baseband signal to generate a high-frequency signal. A power amplifier amplifies the generated high-frequency signal. An antenna transmits the amplified high-frequency signal. A detector detects the amplified high-frequency signal. A first nonvolatile memory stores the desired transmission power of the high-frequency signal to be transmitted from the antenna. A controller adjusts the gain of the variable gain amplifier depending on the output of the detector and the transmission power stored in the first nonvolatile memory.

Abstract: A signal-generating circuit includes a voltage-controlled oscillator that generates an oscillated signal; a first frequency divider that generates a first divided signal by dividing the oscillated signal; a second frequency divider that generates a second divided signal by dividing the divided signal; a phase comparator that receives as input the second divided signal and a reference signal and outputs two signals corresponding to a phase difference therebetween; a loop filter that extracts a low frequency signal between the two signals to be output to the voltage-controlled oscillator; a third frequency divider that generates a third divided signal by dividing the first divided signal; a first frequency converter that generates a first frequency converted signal by multiplying the oscillated signal by the third divided signal; and a first multiplier that generates a multiplied signal by multiplying the first frequency converted signal by a first multiplication number.

Abstract: A wireless communication device of the present disclosure has: a transmitter having a plurality of transmission circuit branches; a receiver having a plurality of reception circuit branches; a transmission phase switch; a reception phase switch; and a phase/transmission-reception controller, and has a beam-forming function. When phase switching is performed during a plurality of training packets for setting directivity, the phase/transmission-reception controller controls the transmission phase switch and the reception phase switch by setting a same phase for each of m (m being an integer of 2 or more) number of continuous training packets. In addition, the phase/transmission-reception controller performs control such that the transmission of the transmitter and the reception of the receiver are set to an OFF state in at least one or more training packets from the beginning of the m number of continuous training packets.

Abstract: A wireless communication device includes a BBIC for performing baseband signal processing, an RFIC for performing radio-frequency signal processing, and a quartz resonator. The RFIC has a storage unit which stores an adjustment value for adjustment of a clock frequency that is based on an oscillation frequency of the quartz resonator, and outputs the adjustment value when its resetting active state is canceled; a frequency adjusting unit for adjusting the clock frequency according to the adjustment value; and an RF signal processing unit which operates based on the clock signal and performs the radio-frequency signal processing.

Abstract: An ESD protection device includes a first discharge electrode and a second discharge electrode arranged to oppose each other, a discharge supporting electrode formed so as to span between the first and second discharge electrodes, and an insulator substrate that retains the first and second discharge electrodes and the discharge supporting electrode. The discharge supporting electrode is constituted by a group of a plurality of metal particles each coated with a semiconductor film containing silicon carbide. This discharge supporting electrode is obtained by firing a semiconductor-metal complex powder in which a semiconductor powder composed of silicon carbide is fixed to surfaces of metal particles. Selection is made so that the relationship between a coating amount Q [wt %] of the semiconductor powder in the semiconductor-metal complex powder and a specific surface area S [m2/g] of the metal powder satisfies Q/S?8.

Abstract: A signal-generating circuit includes a voltage-controlled oscillator that generates an oscillated signal; a first frequency divider that generates a first divided signal by dividing the oscillated signal; a second frequency divider that generates a second divided signal by dividing the divided signal; a phase comparator that receives as input the second divided signal and a reference signal and outputs two signals corresponding to a phase difference therebetween; a loop filter that extracts a low frequency signal between the two signals to be output to the voltage-controlled oscillator; a third frequency divider that generates a third divided signal by dividing the first divided signal; a first frequency converter that generates a first frequency converted signal by multiplying the oscillated signal by the third divided signal; and a first multiplier that generates a multiplied signal by multiplying the first frequency converted signal by a first multiplication number.

Abstract: The ESD protection device includes: opposed electrodes 2 including an opposed electrode 2a on one side and an opposed electrode 2b on the other side, and a discharge auxiliary electrode 3, the discharge auxiliary electrode being placed so as to extend from the opposed electrode on one side to the opposed electrode on the other side, wherein the discharge auxiliary electrode contains metal grains, semiconductor grains and a glass material, the metal grains, the semiconductor grains, and the metal grain and the semiconductor grain are bound together, respectively, via the glass material, the average grain size X of the metal grains is 1.0 ?m or more, and the relationship between the thickness Y of the discharge auxiliary electrode and the average grain size X of the metal grains satisfies the requirement of 0.5?Y/X?3.

Abstract: A wireless communication device includes a digital modulation signal generator that generates digital modulation signals, a DAC that converts digital output of the digital modulation signal generator into analog signals, a modulator that generates amplified quadrature modulation signals by exerting quadrature modulation and amplification on the analog signals, an antenna that radiates the amplified quadrature modulation signals, a power detector that outputs power detected signals obtained from power detection of the amplified quadrature modulation signals, a controller that adjusts gain of the modulator by using the power detected signals and a desired power value, a thermometer that measures ambient temperatures at a plurality of burst transmission periods, and a high-power prevention circuit that readjusts the gain of the modulator for a present burst transmission period.

Abstract: An ESD protection device having high insulation reliability and excellent discharge characteristics is provided. In an ESD protection device including a first and a second discharge electrode disposed to face each other, a discharge auxiliary electrode (18) formed so as to bridge the first and second discharge electrodes, and an insulating substrate holding the first and second discharge electrodes and the discharge auxiliary electrode (18), the discharge auxiliary electrode (18) is formed of an aggregate of metal grains (24) each having a core-shell structure comprising a core portion (22) primarily formed of a first metal and a shell portion (23) primarily formed of a metal oxide containing a second metal, and the aggregate of metal grains (24) further includes an insulating resin (27) which bonds the metal grains (24) to each other.

Abstract: A variable gain amplifier amplifies a baseband signal. A quadrature modulator quadrature-modulates the amplified baseband signal to generate a high-frequency signal. A power amplifier amplifies the generated high-frequency signal. An antenna transmits the amplified high-frequency signal. A detector detects the amplified high-frequency signal. A first nonvolatile memory stores the desired transmission power of the high-frequency signal to be transmitted from the antenna. A controller adjusts the gain of the variable gain amplifier depending on the output of the detector and the transmission power stored in the first nonvolatile memory.

Abstract: An ESD protection device 1 has a ceramic insulating material 10, first and second discharge electrodes 21 and 22, and a discharge-assisting section 51. The first and second discharge electrodes 21 and 22 are disposed somewhere of the ceramic insulating material 10. The discharge-assisting section 51 is located between the distal end portion of the first discharge electrode 21 and the distal end portion of the second discharge electrode 22. The discharge-assisting section 51 is an electrode configured to reduce the discharge starting voltage between the first discharge electrode 21 and the second discharge electrode 22. The discharge-assisting section 51 is made from a sintered body containing conductive particles and at least one of semiconductor particles and insulating particles. The first and second discharge electrodes contain at least one of the semiconductor material constituting the semiconductor particles and the insulating material constituting the insulating particles.

Abstract: In a wireless communication device, baseband variable gain amplifiers amplify a baseband signal. Mixers convert the amplified baseband signal into a high-frequency transmission signal. Hybrid variable gain amplifiers amplify an in-phase local signal and an orthogonal local signal which are input to the mixers. The level detection controller changes respective gains of the baseband variable gain amplifiers and the hybrid variable gain amplifiers (505a, 505b), in response to power of the high-frequency.

Abstract: A wireless communication device includes a BBIC for performing baseband signal processing, an RFIC for performing radio-frequency signal processing, and a quartz resonator. The RFIC has a storage unit which stores an adjustment value for adjustment of a clock frequency that is based on an oscillation frequency of the quartz resonator, and outputs the adjustment value when its resetting active state is canceled; a frequency adjusting unit for adjusting the clock frequency according to the adjustment value; and an RF signal processing unit which operates based on the clock signal and performs the radio-frequency signal processing.

Abstract: An ESD protection device 1 includes an insulating member 10, first and second discharge electrodes 21 and 22, a first outer electrode 31, a second outer electrode 32, and inner conductors 41 and 42. The first and second discharge electrodes 21 and 22 are provided in the insulating member 10. The first outer electrode 31 is provided on an outer surface of the insulating member 10. The first outer electrode 31 is electrically connected to the first discharge electrode 21. The second outer electrode 32 is provided on an outer surface of the insulating member 10. The second outer electrode 32 is electrically connected to the second discharge electrode 22. The inner conductors 41 and 42 are provided in the insulating member 10. The inner conductors 41 and 42 are connected to the first outer electrode 31 or the second outer electrode 32.

Abstract: Provided is an ESD protection device having high insulation reliability and good discharge characteristics. An ESD protection device includes a first discharge electrode and a second discharge electrode that are disposed so as to face each other, a discharge auxiliary electrode (18) formed so as to span between the first discharge electrode and the second discharge electrode, and an insulator base that holds the first discharge electrode, the second discharge electrode, and the discharge auxiliary electrode (18). The discharge auxiliary electrode (18) includes an aggregate of a plurality of metal particles (24) each having a core-shell structure including a core portion (22) that contains, as a main component, a first metal and a shell portion (23) that contains, as a main component, a metal oxide containing a second metal. A pore (26) is present in at least part of the shell portion (23).