Abstract: A combiner for a Doherty amplifier includes, on and in a dielectric substrate, a carrier input terminal, a peak input terminal, an output terminal, a combining point for combining an output signal from the carrier amplifier and an output signal from the peak amplifier, a first ?/4 line connected between the carrier input terminal and the combining point, a second ?/4 line connected between the combining point and the output terminal, and a first directional coupler. The first directional coupler includes a third ?/4 line electromagnetically coupled to one, to be monitored, of the first ?/4 line and the second ?/4 line.

Abstract: A combiner for a Doherty amplifier includes, on and in a dielectric substrate, a carrier input terminal, a peak input terminal, an output terminal, a combining point for combining an output signal from the carrier amplifier and an output signal from the peak amplifier, a first ?/4 line connected between the carrier input terminal and the combining point, a second ?/4 line connected between the combining point and the output terminal, and a first directional coupler. The first directional coupler includes a third ?/4 line electromagnetically coupled to one, to be monitored, of the first ?/4 line and the second ?/4 line.

Abstract: An oscillator includes a phase shifter and a power distributor which are disposed in a dielectric substrate comprising a plurality of stacked dielectric layers. The phase shifter comprises a coupler and a reflecting circuit. The dielectric substrate has a first formation region containing a plurality of electrodes serving as the coupler, a second formation region containing a plurality of electrodes serving as the reflecting circuit, and a third formation region containing a plurality of electrodes serving as the power distributor. The first formation region, the second formation region, and the third formation region are disposed in respective positions that are spaced from each other in a plane within the dielectric substrate.

Abstract: An oscillator includes a phase shifter and a power distributor which are disposed in a dielectric substrate comprising a plurality of stacked dielectric layers. The phase shifter comprises a coupler and a reflecting circuit. The dielectric substrate has a first formation region containing a plurality of electrodes serving as the coupler, a second formation region containing a plurality of electrodes serving as the reflecting circuit, and a third formation region containing a plurality of electrodes serving as the power distributor. The first formation region, the second formation region, and the third formation region are disposed in respective positions that are spaced from each other in a plane within the dielectric substrate.

Abstract: The problem of interference and coupling between circuits that arises in reducing the size of a voltage-controlled oscillator by using low temperature co-fired ceramics (LTCC) substrate technology is alleviated. A voltage-controlled oscillator includes an amplifier a surface acoustic wave device 15 that forms a feedback circuit for the amplifier; a frequency adjuster that is provided the feedback circuit and has a filter configuration; a phase shifter 13 including a hybrid coupler having an additional controller that receives a control voltage from an external source and changes a phase in an oscillation loop; an equal power distributor 12 that equally distributes output power in the oscillation loop and outputs the power to the outside of the oscillation loop; and a delay line 16 concentratedly provided a place where coupling or interference does not occur the oscillation loop for correcting a phase condition in the oscillation loop.

Abstract: The problem of interference and coupling between circuits that arises in reducing the size of a voltage-controlled oscillator by using low temperature co-fired ceramics (LTCC) substrate technology is alleviated. A voltage-controlled oscillator includes an amplifier 11; a surface acoustic wave device 15 that forms a feedback circuit for the amplifier; a frequency adjuster 14 that is provided in the feedback circuit and has a filter configuration; a phase shifter 13 including a hybrid coupler having an additional controller that receives a control voltage from an external source and changes a phase in an oscillation loop; an equal power distributor 12 that equally distributes output power in the oscillation loop and outputs the power to the outside of the oscillation loop; and a delay line 16 concentratedly provided in a place where coupling or interference does not occur in the oscillation loop for correcting a phase condition in the oscillation loop.

Abstract: A gain of a broadcast signal receiver for the digital audio broadcast (DAB) system is controlled in order to obtain an output signal of a predetermined level using an AGC loop. The DAB signal of the DAB system includes a Guard Interval within an interval of each symbol, and the Guard Interval does not include valid data to be recovered. Accordingly, the gain change of the AGC loop is done within the Guard Interval in order to avoid signal distortion in the output signal, thereby the DAB receiver having high fidelity is achieved with low cost.

Abstract: A setting construction has a construction such that: an elastically deformable pin by a bending stress (hereinafter, called as elastically bending pin) is arranged to a peripheral end of the shield case made of metal or the planar antenna installed in a wireless device; a through hole is arranged to the circuit board or the circuit board and an outer casing; and the shield case or the planar antenna is electrically and/or mechanically connected to the circuit board or the circuit board and the outer casing by inserting the elastically bending pin into the through hole. As a preferred embodiment, the setting construction relates to a setting construction of component parts on the circuit board, a setting construction between a planar antenna installed in a wireless device and the circuit board, a setting construction of a shield case on the circuit board and a setting construction of the shield case on the circuit board with the outer casing.

Abstract: A unidirectional transducer for a SAW filter having a first group (D) including electrode finger (21) and electrode fingers (14) and (16) arranged at center distances of 3&lgr;/8 and 5&lgr;/8 in a direction opposite to the propagation direction of the surface acoustic wave from electrode finger (21); a second group (E) including electrode fingers (22), (15) and (20) arranged at center distances of 10&lgr;/8, 13&lgr;/8 and 15&lgr;/8 in the propagation direction from electrode finger (21); and a third group (F) including electrode fingers (17), (18) and (19) arranged at center distances of 3&lgr;/8, 5&lgr;/8 and 7&lgr;/8 in the propagation direction from electrode finger (21).

Abstract: A DAB (Digital Audio Broadcasting) receiver includes a delay circuit for delaying a received DAB signal by a prescribed period, a correlation circuit for taking correlation between a delayed output of the delay circuit and the DAB signal, a moving average circuit for moving-averaging a correlation output of the correlation circuit over a width that is equal to a guard period, a peak detection circuit for detecting a position in time of a peak of a moving average output of the moving average circuit, a calculation circuit for calculating an error in a reception frequency based on a phase deviation in the DAB signal at the position in time that is indicated by a peak detection output of the peak detection circuit, an FFT (Fast Fourier Transform) circuit for subjecting the DAB signal to FFT processing, and a detection circuit for determining a reception center frequency based on an FFT output of the FFT circuit.

Abstract: A unidirectional transducer for a SAW filter comprises a first group (D), a second group (E) and a third group (F). The first group (D) comprises, the electrode finger (21), the electrode finger (14) arranged at a center distances 3&lgr;/8 in a direction opposite to the propagation direction of the surface acoustic wave (i.e. toward right in the Figure) the electrode finger (21), and the electrode finger (16) arranged at a center distance 5&lgr;/8 in a direction opposite to the propagation direction from the electrode finger(21). The second group (E) comprises the electrode finger (22) arranged at a center distance 10&lgr;/8 in the propagation direction from the electrode finger (21), the electrode finger (15) arranged at a center distance 13&lgr;/8 in a the propagation direction from the electrode finger (21), and the electrode finger (20) arranged at a center distance 15&lgr;/8 in a the propagation direction from the electrode finger (21).

Abstract: An apparatus for receiving digital information signals, including a signal receiving portion for receiving a digital information signal, and for transmitting digital data composed of a series of transmission frames each divided into a plurality of segmental periods called symbols and including a reference Symbol for synchronization, a reference Symbol data extracting portion for extracting data transmitted through a reference Symbol from each of transmission frames of digital data obtained from the received digital information signal, a frequency offset detecting portion for obtaining a first frequency offset detection output based on the received digital information signal a strength of, data transmitted through the, reference Symbol at every transmission frame and obtaining also a second frequency offset detection output based on with the received digital information signal and a strength of specific data included in data transmitted in each of the plurality of Symbols, and a frequency synchronizing control

Abstract: A demodulating apparatus and a demodulating method includes a correlation detector for detecting a correlation between a guard section of the symbol of a digital orthogonal frequency division multiplex modulated signal and a section having a correlation with the guard section in an effective symbol of the symbol, a section integrator for section integrating a detected output of the correlation detector with respect to the guard section, a peak detector for detecting a peak of a triangular wave signal from the section integrator, and a frame timing signal producing circuit for producing a frame timing signal of a predetermined frame of each of the frames based on a peak detecting signal from the peak detector. The frame synchronizing signal generator circuit may be made synchronized by a frame timing signal from the frame timing signal producing circuit.

Abstract: A demodulating apparatus according for demodulating a modulated signal obtained by modulating a plurality of carriers having different frequencies, includes a data demodulating circuit for demodulating data by frequency-analyzing a time waveform of the modulated signal which is formed of a data period of one modulation time and a guard interval succeeding the data period and which includes in the data period a period having correlation with the guard interval and provided at a position away from the modulated signal by the one modulation time, a correlation circuit for detecting correlation between the guard interval of the modulated signal and the period in the data period having correlation with the guard interval and provided at a position away from the modulated signal by the one modulation time, and a synchronization signal generating circuit including the correlation circuit and for generating a synchronization signal based on a detection output from the correlation circuit.

Abstract: A discriminating apparatus for digital audio broadcasting according to the present invention includes a delay means for delaying an input signal by a time corresponding to a period of an effective symbol in a symbol, a correlation means for judging whether any correlation exists or not between the input signal and a delayed signal from the delay means, a moving average means for calculating a moving average of an output of the correlation means in a period corresponding to a guard interval in the symbol, and a comparing means for comparing an output of the moving average means with a threshold level. It is determined based on an output of the comparing means whether or not the input signal is a digital audio broadcasting signal.

Abstract: An Alternating Current bias control circuit for a magnetic recording head which is suitable to be formed by an Integrated Circuit, wherein a band-pass filter for extracting an audio frequency signal component from a terminal voltage of the magnetic recording head and for supplying the audio frequency signal component to a peak detector is formed by a Resistor-Capacitor circuit. The input impedance of the band-pass filter is made high enough to reduce the power consumption, and the output impedance of the same is made low enough to facilitate impedance matching with the peak detector.