Abstract: A distributor arranged between a tuner module and an antenna, the tuner module including a first input portion and a second input portion for inputting a satellite broadcast signal transmitted from an artificial satellite and a ground broadcast signal transmitted from a ground base station respectively, and the antenna receiving either one of the broadcast signals. The distributor includes a first connector portion connected to the antenna; a second connector portion connected to the first input portion; a third connector portion connected to the second input portion; and a junction connecting portion distributing the signal inputted to the first connector portion to the second and the third connector portions. A drive voltage of the antenna inputted from the first input portion is outputted to the antenna. The voltage outputted to the antenna is fed back to the second input portion through the junction connecting portion and the third connector portion.

Abstract: A direct conversion receiver includes a mixer for converting an RF signal into a baseband signal, a dynamic DC offset compensator for compensating for a dynamic DC offset caused by the effect of second order nonlinear distortion of the mixer on an interfering wave that enters the input terminals of the mixer, and a static DC offset compensator for compensating for a static DC offset caused by self-mixing of a local signal and a leakage component of the local signal that appears at the input terminals of the mixer. The static DC offset compensation starts at a time t1 after a DC offset compensation operation has started. The static DC offset compensation is finished at the next time t2, and then the dynamic DC offset compensation starts. The dynamic DC offset compensation is finished at the next time t3. With this configuration, only a change in DC offset due to the dynamic DC offset is compensated after compensating for the static DC offset component.

Abstract: An integrated circuit includes an on-chip antenna interface, coupled to an off-chip antenna interface having at least one off-chip filter component that forms a programmable filter with the at least one off-chip filter component. The programmable filter is programmable based on a control signal. An RF receiver generates inbound data in response to a received signal from the programmable filter.

Abstract: A communication system with an antenna array having a respective antenna for each of a multitude of communication modules and a control system which seiectiyely reassigns communication over a first of said multitude of communication modules to a second communication module of said multitude of communication modules in response to identification of a predicted interference within a predetermined interference matrix.

Abstract: A receiver has an offset application circuit for applying a known offset to an input signal, and a decision circuit for comparing the offset-applied input signal with a reference voltage. The level of the input signal is determined based on the known offset and on the result output from the decision circuit. With this configuration, a large common mode voltage can be eliminated in a circuit used for signal transmission.

Abstract: A receiver (200) includes a mixing digital-to-analog converter (DAC) (208), a direct digital frequency synthesizer (DDFS), a transimpedance amplifier (TIA) (204) and a first polyphase filter (PPF) (202). The mixing DAC (208) includes a radio frequency (RF) transconductance section for providing an RF current signal responsive to an RF signal and a switching section. The switching section is coupled to the RF transconductance section and includes inputs for receiving bits associated with a digital local oscillator (LO) signal. The switching section is configured to mix the RF current signal with the digital LO signal to provide an analog output signal at outputs of the switching section. The transimpedance amplifier (TIA) (204) includes inputs each coupled to a respective one of the outputs of the switching section and outputs. The first PPF (202) includes inputs each coupled to a respective one the outputs of the TIA (204).

Abstract: A waveform reconstruction circuit receives an rf signal from an antenna, digitizes it, and then generates an undistorted reconstructed waveform. The reconstructed waveform can then be conventionally mixed and demodulated to extract useful signal information with enhanced receiver fidelity and sensitivity.

Abstract: A combined transmission unit for TMDS signals and LVDS signals. First (LVDS) and second (TMDS) transmission units are both coupled to a first set of input terminals. A switching controller, according to a mode selection signal, enables the first transmission unit to transmit the first data on the set of input terminals to first external input units through a pair of first signal lines or enables the second transmission unit to transmit the first data on the set of input terminals to the second external input units through a pair of second signal lines.

Abstract: A radio frequency arrangement includes a first semiconductor body having on a first side a radio frequency connection location for emitting therefrom or for supplying thereto a radio frequency signal, and a low frequency signal connection location for emitting therefrom or for supplying thereto a low frequency signal. The arrangement also includes a flexible antenna carrier having a first side and a second side with a metalized region formed as an antenna, wherein the metalized region has a radio frequency contact location on or in the first side of the antenna carrier, and wherein the first side of the antenna carrier and the first side of the first semiconductor body are arranged such that they face one another. In addition, the radio frequency contact location on or in the first side of the antenna carrier is coupled to the radio frequency connection location on the first side of the semiconductor body.

Abstract: The present invention relates to a transceiver for bidirectional frequency division multiplexed transmission, a communication system including one or more transceivers. Optionally, the communication system is a communication system for a digital subscriber line. The transceiver comprises transmission means with a voltage source output or a current source output for transmitting data in a transmission frequency range, receiving means for receiving data in a receiving frequency range, and a coupling impedance for connecting the transmission means and the receiving means to a transmission medium. The magnitude of the coupling impedance in the transmission frequency range is smaller than the magnitude of the coupling impedance in the receiving frequency range if the transmission means has a voltage source output and is higher than the magnitude of the coupling impedance in the receiving frequency range if the transmission means has a current source output.

Abstract: A circuit includes one or more first amplifiers operable to amplify an incoming signal to produce an amplified incoming signal. The incoming signal is associated with a desired signal. The circuit also includes a controller. In response to the amplified incoming signal exceeding a first threshold and the desired signal not exceeding a second threshold, the controller is operable to allow one or more second amplifiers to amplify the incoming signal and/or increase a current supplied to the one or more first amplifiers.

Abstract: A comparator for comparing an AFC output an analog demodulation circuit with a predetermined reference voltage Vref, an OR gate to which two inputs including an output of the comparator and a channel select signal are input, and a switch for connecting a crystal oscillator of a digital demodulation circuit to the digital demodulation circuit when an output of the OR gate is “H (or 1)” are provided. When an analog broadcast signal that should be received is not normally received, the crystal oscillator of the digital demodulation circuit is connected to the digital demodulation circuit to operate the digital demodulation circuit. Then, the channel select signal is supplied to a PLL circuit of a tuner front end via the digital demodulation circuit.

Abstract: A circuit package includes first and second units containing functional circuitry. At least one RF isolation link interconnects the first and second units and provides voltage isolation between the first and second units. The RF isolation link provides data between the first unit and the second unit using an RF carrier signal that sweeps between a first frequency and a second frequency.

Abstract: Described are communication systems that convey differential and common-mode signals over the same differential channel. Noise-tolerant communication schemes use low-amplitude common-mode signals that are easily rejected by differential receivers, thus allowing for very high differential data rates. Some embodiments employ the common-mode signals to transmit backchannel signals for adjusting the characteristics of the differential transmitter. Backchannel control signals are effectively conveyed even if the forward channel transmitter is so maladjusted that the received differential data is unrecognizable. Systems in accordance with the above-described embodiments obtain these advantages without additional pins or communications channels, and are compatible with both AC-coupled and DC-coupled communications channels. Data coding schemes and corresponding data recovery circuits eliminate the need for complex, high-speed CDR circuits.

Abstract: An antenna steering algorithm for a smart antenna uses signal quality metrics and link quality metrics for selecting a preferred antenna beam. The link quality metrics supplement the signal quality metrics for improving the antenna steering decision. The link quality metrics are based on information available from existing counters operating in the media access control (MAC) layer. Separate estimates of the frame error rates in the receive links and in the transmit links are obtained. One estimate is the downlink quality metric (DLQM) and another estimate is the uplink quality metric (ULQM). Alternative link quality metrics are based on throughput and data rates of the exchanged data.

Abstract: An antenna unit includes an antenna, a high-frequency amplifier, an attenuator circuit, an output cable, and a voltage detector circuit. An operating voltage is supplied from a receiver to the high-frequency amplifier through the output cable. The operating voltage changes in accordance with an automatic gain control (AGC) voltage. The voltage detector circuit detects a change in the operating voltage. In response to the voltage detector circuit output, one of the high-frequency amplifier and the attenuator circuit is selectively connected to a signal line between the antenna and the output cable.

Abstract: A frequency generator which can perform stable frequency oscillation unaffected by temperature variation. A frequency generator having a differential amplifier (1) having an LC resonance circuit (10) as a load and buffer circuits (21, 22) feeding back an output of the differential amplifier to its input, wherein a temperature coefficient converter (5) converting an output voltage of a reference voltage generator (4) and its temperature dependence to a voltage having a predetermined voltage and temperature coefficient and outputting it is provided to control bias currents IEF of emitter follower circuits to be in proportion to temperature variation. There are a characteristic in which delay time of the emitter follower circuits constructing the buffer circuits is in inverse proportion to a transconductance of transistors and a characteristic in which the transconductance is in inverse proportion to temperature and is in proportion to the bias currents IEF.

Abstract: A communications network, in particular for telephony, comprises at least one operator a plurality of remote units for exchanging signals with mobile terminals and an interface unit for controlling the data traffic between the operator and the remote units. The interface unit is connected to the remote units by a first transmission support in which the main signal propagates. The main signal is divided into a plurality of secondary signals, each identified by a preset parameter value. Each remote unit is designed to process at least one secondary signal selected from amongst the secondary signals into which the main signal is divided. The secondary signal is identified by the remote unit according to the above-mentioned present parameter value.

Abstract: To provide a high frequency switch capable of dealing with multiple frequency bands without having plurality of switch circuits. A first diode that conducts due to a bias current when a first switch is closed is interposed between first signal terminal and a second signal terminal. A strip line with the electrical length L1 is connected to the cathode of the first diode, the other end being grounded. At a position with a distance L2 from one end of the strip line, a capacitor and a second switch are connected to be equivalently grounded when the second switch is closed. The strip line resonates with the electrical length L1 when the second switch is opened, and resonates with the electrical length L2 when the second switch is closed.

Abstract: An image-rejecting antenna apparatus includes an antenna unit for receiving or transmitting a wireless signal and an image-reject unit for removing an image component signal having a predetermined frequency from among signals received from the antenna unit. In an image-rejecting antenna apparatus that receives a predetermined signal and provides a processed signal to a RF circuit unit for performing a predetermined function may also include an impedance matching unit for matching an impedance of the antenna unit with an impedance of the RF circuit unit and for providing the signal from which the image component signal has been removed to the RF circuit unit. A noise component of an image frequency that is transmitted to a subsequent circuit can be minimized or removed by including an image-reject unit when designing an antenna and a matching circuit, thereby improving the image-rejecting capabilities of an entire receiver.

Abstract: The present invention discloses a generic approach to the design of single-path, switchless multi-resonant, multi-band power amplifiers. In the preferred embodiments, the amplifier includes one or more amplification stages, a switchless, multi-resonant, input impedance network, a switchless, multi-resonant, output impedance network, and if multi-stage, a switchless, multi-resonant, interstage impedance network between each amplification stage. Multi-band amplification is accomplished without the need for externally-applied, frequency-indicating control signals. Moreover, the amplifier may be designed to provide concurrent multi-band amplification or non-concurrent amplification.

Abstract: A portable radio terminal comprises a housing, a radio circuit included in the housing, a matching circuit mounted on the top of the housing at a position which is offset from the longitudinal center line of the housing, a load connected to the tip of the matching circuit, and a linear antenna connected to the load. This portable radio terminal further comprises load changing means for changing the value of the load. The matching circuit may comprise a meander matching element, a zigzag-shaped matching element, a helical matching element, a conical matching element, a rectangular helical matching element or a pyramid helical matching element which are formed so as to a predetermined shape, such as a meander shape, a zigzag shape, a helical shape, a conical shape, a rectangular helical shape or pyramid helical shape.

Abstract: A waveform reconstruction circuit receives an rf signal from an antenna, digitizes it, and then generates an undistorted reconstructed waveform. The reconstructed waveform can then be conventionally mixed and demodulated to extract useful signal information with enhanced receiver fidelity and sensitivity.

Abstract: A transceiver system is disclosed for use in a telecommunication system. The transceiver system includes a transmission circuit including a differential transmitter input coupled to a differential input of a transmission amplifier, a receiver circuit including a differential receiver output coupled to a differential output of a receiver amplifier, and a transmission line interface circuit that is coupled to a differential output of the transmission amplifier and to a differential input of the receiver amplifier. The transmission line interface circuit providing a second order high pass transfer function.

Abstract: In a PLL circuit, the number of LPFs is reduced to one to reduce mounting area and pin number, and to simplify design. In one embodiment, the PLL circuit includes a variable-gain phase comparator, a mixer, an LPF, VCOs, couplers, and a control circuit to controlling the on/off operation of the VCOs. The variable-gain phase comparator is capable of varying a phase difference gain. The on/off of the operation of the VCOs is controlled by the control circuit so that one of the VCOs is turned off. The phase difference conversion gain is varied in accordance with the sensitivity of the VCOs so the number of LPFs required for the PLL circuit can be reduced to only one.

Abstract: A foldable portable radio terminal is disclosed which normally optimizes an antenna characteristic by an antenna matching circuit even if the body length of the foldable portable radio terminal varies. A folded state detection circuit sends a detection signal to a control section depending upon whether or not the foldable portable radio terminal is folded. An antenna matching circuit is determined so that the antenna characteristic of an antenna is optimized when the foldable portable radio terminal is in a folded state. When the foldable portable radio terminal is unfolded, the control section renders a matching characteristic changeover circuit operative to change over the matching characteristic of the antenna matching circuit so that, even when the foldable portable radio terminal is in an unfolded state, the antenna characteristic by the antenna matching circuit may be optimized.

Abstract: In a PLL circuit, the number of LPFs is reduced to one to reduce mounting area and pin number, and to simplify design. In one embodiment, the PLL circuit includes a variable-gain phase comparator, a mixer, an LPF, VCOs, couplers, and a control circuit to controlling the on/off operation of the VCOs. The variable-gain phase comparator is capable of varying a phase difference gain. The on/off of the operation of the VCOs is controlled by the control circuit so that one of the VCOs is turned off. The phase difference conversion gain is varied in accordance with the sensitivity of the VCOs so the number of LPFs required for the PLL circuit can be reduced to only one.

Abstract: Antenna elements are provided along a linear line at regular intervals to be parallel to each other. The antenna elements receive signals transmitted from a communicating partner and output the signals to a receiving beam former. In the receiving beam former, phase shifters phase-shift the received signals input from the antenna elements of an even element number by ?. A combiner adds the received signals that are phase-shifted by ? in phase shifters and the signals input from the antenna elements of an odd number to form a received beam. With this configuration, it is possible to realize an array antenna apparatus of a small and simple configuration that reduces the radiation of radio waves to the human body and to other equipment and that is influenced little by the human body and by other equipment.

Abstract: The invention concerns a mixer, in particular for an dual conversion receiver. The mixer includes a first variable transconductance stage (A) controlled by a high frequency carrier signal, this first stage including first (37) and second (38) terminals delivering a first signal; and a second stage (B) connected to said first terminal of the first stage including, in parallel, first (T32) and second (T33) switching means respectively controlled by first (in2) and second (in2b) phase opposition control signals at a first intermediate frequency (IF1), these first and second switching means being powered by a substantially equal current supplied by polarisation means (34). The mixer according to the invention is characterised in that it further includes means (T36) for modulating said first signal delivered by said first stage by means of a third control signal (in3) at a second intermediate frequency (IF2).

Abstract: A balanced antenna is provided for a mobile telephone which couples to the outputs from a balanced power amplifier stage without needing connection through a lossy conversion circuit. The balanced antenna comprises two radiating elements positioned opposite one another with the feed points positioned so that the radiating fields from the two elements superpose. A floating ground is also provided which reduces the effects of components located on the PCB under the antenna.

Abstract: N input signals are fed (702) to a first Fourier Transform Matrix (FTM) (208) to produce N intermediate signals. Each of the N intermediate signals is split (704) via a non-isolating splitter (300) to produce M split signals. At least one of the M split signals from each of the N intermediate signals is amplified (706) to produce at least N amplified signals. The at least N amplified signals are coupled (708) to N non-isolating combiners (300), each having at least M input ports, to produce N combiner output signals. The N combiner output signals are applied (710) to a second FTM (210) to produce N final output signals.

Abstract: A triplexer and a multilayered structure thereof. The triplexer comprises a first filter circuit and a low pass filter circuit connected in parallel to an input terminal, and a second filter circuit and a third filter circuit connected in parallel to an output terminal of the low pass filter circuit. The first filter circuit passes a signal of a first frequency band, and the low pass filter circuit passes a signal of a predetermined frequency band which is lower than the first frequency band. The second filter circuit extracts a signal of a second frequency band from the predetermined frequency band signal, and the third filter circuit extracts a signal of a third frequency band from the predetermined frequency band signal, which third frequency band is lower than the second frequency band. The low pass filter circuit includes a notch circuit for extending a portion of the predetermined frequency band, neighboring the first frequency band.

Abstract: An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programable attenuation and a programable gain low noise amplifier. Frequency conversion circuitry advantageously uses LC filters integrated onto the substrate in conjunction with image reject mixers to provide sufficient image frequency rejection. Filter tuning and inductor Q compensation over temperature are performed on chip. The filters utilize multi track spiral inductors. The filters are tuned using local oscillators to tune a substitute filter, and frequency scaling during filter component values to those of the filter being tuned. In conjunction with filtering, frequency planning provides additional image rejection. The advantageous choice of local oscillator signal generation methods on chip is by PLL out of band local oscillation and by direct synthesis for in band local oscillator.

Abstract: A radio frequency connector that protrudes through a printed circuit board is comprised of threaded leads. A center conductor is shielded when a shielding connector cap, having a threaded inner portion, screws onto the threaded leads.

Abstract: A GPS receiver module (1) for receiving GPS signals and for determining position data therefrom is described, which is characterized in particular by a communications sub-module (3), to which the position data determined can be fed and by means of which said data can be converted into a format suitable for transmission to an a external appliance. The communications sub-module (3) is preferably a Bluetooth (BT) sub-module, by means of which the position data can be converted according to the Bluetooth standard and transmitted by wireless means. A dual band antenna particularly suitable for use with the GPS receiver module is furthermore described, by means of which it is not only possible to receive GPS signals, but also to establish a communications link with external appliances.

Abstract: A receiver has an offset application circuit for applying a known offset to an input signal, and a decision circuit for comparing the offset-applied input signal with a reference voltage. The level of the input signal is determined based on the known offset and on the result output from the decision circuit. With this configuration, a large common mode voltage can be eliminated in a circuit used for signal transmission.

Abstract: A transmitter circuit improves a noise margin for decoding a common mode signal at a receiver circuit. The transmitter circuit includes a common mode signal transmitter and a noise margin enhancement circuit coupled to a transmission line. The common mode signal transmitter transmits a control message using a common mode signal. The common mode signal has a first voltage level and a second voltage level higher than the first voltage level, and the control message corresponds to a portion of the common mode signal having the first voltage level. The noise margin enhancement circuit raises a voltage level of the common mode signal to a third voltage level higher than the second voltage level for a specific time period from a rising edge of the common mode signal from the first voltage level.

Abstract: A mobile radio machine of folding type with simple structure which can receive a pull-out type whip antenna and function as antenna even when the antenna is restored is disclosed. In the mobile radio machine, when the antenna is pulled out, a change-over circuit 8 connects a radio circuit 12 with an impedance matching circuit 9 and supplies power to a linear antenna element 1 through a feeding terminal 5, so that only the linear antenna element 1 functions as antenna. When the antenna is restored, the change-over circuit 8 connects the radio circuit 12 with an impedance matching circuit 10 and supplies power to a coil antenna element 3 through a feeding terminal 6, and therefore only the coil antenna element 3 functions as antenna. Thus, antenna can be used in a small size, folding type mobile radio machine in simple structure.

Abstract: Multi-band, Inverted-F Antenna with capacitively created resonance, and radio terminal using same. The present invention creates an additional resonance frequency in a planar-style, inverted-F antenna (PIFA), such as that typically used in mobile radiotelephone or other types of radio terminals. A first radiating branch of the antenna is connected to the signal feed conductor and the ground feed conductor. A second radiating branch is connected to the signal feed conductor and the ground feed conductor at one end and is capacitively coupled to the first radiating branch at the other end so that the antenna resonates at an additional resonance frequency. The additional resonance frequency can be used for, among other things, adding GPS or Bluetooth functionality to a radiotelephone terminal that otherwise operates on GSM (Global System for Mobile) or other mobile radiotelephone terminal frequencies.

Abstract: RF switches and methods of use are provided. In one embodiment, a RF switch includes first and second switch assemblies, each comprising an elongate member and a magnetic housing on an end of the member. The magnet is disposed between contact pads for first and second circuits, and an electromagnetic source is coupled to the assemblies. Each switch has a first and second state. Another RF switch of the present invention includes a rotor, an elongate member disposed centrally through the rotor, an actuator coupled to the member and configured to rotate the member and the rotor, and a contact on the rotor that may touch a substrate. The contact is used to complete a first path or a second path.

Abstract: A wireless IC interconnect system and a source synchronous CDMA (SS-CDMA) bus interface facilitate interconnections between first and second IC locations. A signal conveyed using the wireless system is modulated and capacitively coupled to a transmission medium, and then capacitively coupled from the medium to a receiver which demodulates the modulated signal and provides the demodulated signal to the second IC location. Multiple signals can be conveyed simultaneously by modulating and demodulating them using multiple access algorithms such as CDMA and/or FDMA. The SS-CDMA bus interface utilizes source synchronous signaling and CDMA techniques to provide high bus concurrency and low channel latency. The interface is re-configurable, and provides multi-chip access in high-bandwidth multi-drop parallel interconnection applications.

Abstract: This invention makes it possible to communicate through solid non-metallic walls or ceilings with low microwave power levels. RF beam forming couplers are driven by common LAN (Local Area Network) circuits.

Abstract: An apparatus for communication of electric or electromagnetic signals over air includes a transmitter or receiver and a coupler. The coupler has a capacitive circuit connected with an air-core or dielectric-core transformer. The capacitive circuit resonates with the transformer at a preselected frequency. The coupler eliminates noise and is matched to the characteristic impedance of the air at the preselected frequency, which linearizes communication and allows high-speed data and voice communication over long distances.

Abstract: A portable radio terminal comprises a housing, a radio circuit included in the housing, a matching circuit mounted on the top of the housing at a position which is offset from the longitudinal center line of the housing, a load connected to the tip of the matching circuit, and a linear antenna connected to the load. This portable radio terminal further comprises load changing means for changing the value of the load. The matching circuit may comprise a meander matching element, a zigzag-shaped matching element, a helical matching element, a conical matching element, a rectangular helical matching element or a pyramid helical matching element which are formed so as to a predetermined shape, such as a meander shape, a zigzag shape, a helical shape, a conical shape, a rectangular helical shape or pyramid helical shape.

Abstract: A portable communication apparatus has a display and a first antenna with a plane radiating member. The display and the plane radiating member are integrated in a multi-layer structure, which is built into the portable communication apparatus. The first antenna may preferably be adapted for satellite communication, such as GPS.

Abstract: A signal receiving apparatus comprises an analog control AGC having a continuously varying gain and a step control AGC having a gain switched in steps, one of which is used to control the gain of a baseband signal, and the other of which is used to control the gain of the gain controlled signal.

Abstract: The fixation of a coaxial cable between a GPS receiver and a receiver antenna mounted in a vehicle to an earthing conductor allows the elimination of influences due to noise and the improvement of reception even if the GPS antenna and the receiver antenna are mounted on the same mounting board due to reduction in the size of the device.

Abstract: A novel terminating differential bus receiver with automatic compensation for process, voltage, and temperature variation is presented. A termination circuit is connected internal to the integrated circuit to the input of a differential receiver in parallel with a transmission line connectable to the receiver. Both the termination circuit and the differential receiver are implemented with at least one p-channel transistor and at least one n-channel transistor, such that the p-channel transistors of the termination circuit and receiver and the n-channel transistors of the termination circuit and receiver are ratioed to vary similarly under PVT variation.

Abstract: A signal reception circuit includes a main antenna which receives signals in at least two predetermined reception frequency bands. A sub-antenna receives a signal in one of the reception frequency bands of the main antenna. A filter for interrupting a signal in the same frequency band as the reception frequency band of the sub-antenna is provided on a transmission line of a reception signal of the main antenna. A filter reflection signal in the same frequency band as the reception frequency band of the sub-antenna is induced in the sub-antenna, due to the antenna coupling thereof. The phase of the filter reflection signal is adjusted by a phase shifter between the main antenna and the filter, so that the induced signal of the sub-antenna is in phase with the reception signal of the sub-antenna. As a result, the level of the composed signal of the induced signal and the reception signal and is to be transmitted from the sub-antenna to a signal processing unit is greatly improved.

Abstract: A triplexer and a multilayered structure thereof. The triplexer comprises a first filter circuit and a low pass filter circuit connected in parallel to an input terminal, and a second filter circuit and a third filter circuit connected in parallel to an output terminal of the low pass filter circuit. The first filter circuit passes a signal of a first frequency band, and the low pass filter circuit passes a signal of a predetermined frequency band which is lower than the first frequency band. The second filter circuit extracts a signal of a second frequency band from the predetermined frequency band signal, and the third filter circuit extracts a signal of a third frequency band from the predetermined frequency band signal, which third frequency band is lower than the second frequency band. The low pass filter circuit includes a notch circuit for extending a portion of the predetermined frequency band, neighboring the first frequency band.