JP2008211647A - Portable terminal and amplifier circuit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable terminal and an amplifier circuit capable of avoiding deterioration of receiving sensitivity of a TV, etc. even when a second communication part is used for acquiring a predetermined piece of data, when viewing and listening to a TV or the like. <P>SOLUTION: A CPU 202 executes a bypass mode (a mode without executing a voltage reduction operation by a DC-DC converter 256) to operate a switching element 257 at an ON state. When the switching element 257 is switched to the ON state, source voltage supplied from a battery bypasses the DC-DC converter 256 and directly supplied to a power amplifier 254. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mobile terminal device and an amplifier circuit used in the mobile terminal device.

In a mobile terminal device, for example, based on received electric field strength autonomously or based on an instruction from a base station for the purpose of reducing unnecessary radiation and power consumption, such as a CDMA (Code Division Multiple Access) system. Thus, a function (power control) for controlling transmission output power from the antenna is employed (see, for example, Patent Documents 1 and 2). In addition, when performing power control, in order to further improve the power efficiency, when reducing the power of the transmission output (for example, when the mobile terminal device is in the vicinity of the base station and can transmit with a small transmission output), The power supply voltage of the power amplifier (PA) that consumes a large amount of power is stepped down by a DC-DC converter, and the voltage after stepping down is used.
Japanese Patent Laid-Open No. 11-274948 Japanese Patent Laid-Open No. 11-41118

  By the way, in recent portable terminal devices, not only a communication function unit by telephone or mail (hereinafter referred to as a first communication function unit) but also a communication function unit (hereinafter referred to as a second communication function unit) for receiving TV, radio, or the like. Something that has a communication function section) has appeared. The second communication function unit uses a signal frequency band different from that of the first communication function unit, and also has a modulation method, and thus includes a dedicated antenna and tuner.

  Here, there is a case where the first communication function unit is used when watching the TV or radio using the second communication function unit. Specifically, when obtaining predetermined data (for example, TV program guide (EPG), music information, etc.) during viewing of a TV or radio, the data is obtained using the first communication function unit. Request or the reception of the data.

  At this time, when a transmission output operation by the DC-DC converter (particularly, a transmission output operation with low transmission output power) is executed in the first communication function unit, the switching frequency of the DC-DC converter (usually about 2 MHz) ) Is applied to the reception band of the tuner of the second communication function unit, and as a result, the sensitivity of the second communication function unit is suppressed and the reception sensitivity of the TV, radio, etc. is deteriorated ( For example, there is a risk of causing image / acoustic noise). In some cases, even when data is received, the reception sensitivity of a TV or radio may be degraded.

  The present invention has been made in view of the above-described problems, and one of its purposes is to use the second communication function unit when the second communication function unit is watching the TV or radio. It is an object of the present invention to provide a portable terminal device and an amplifier circuit that can avoid deterioration in reception sensitivity of a TV, a radio, or the like even when communication is performed by a functional unit.

  In order to solve the above problems, a mobile terminal device according to the present invention is a mobile terminal device having a communication system for performing data communication and a broadcast receiving system for receiving broadcast waves, wherein the communication system includes an antenna, An amplifying unit that amplifies a transmission signal and supplies the amplified signal to the antenna; and a voltage converting unit that generates a control voltage for controlling an amplification amount of the amplifying unit. When data transmission by the communication system occurs during reception, power supply voltage driving that bypasses the voltage conversion unit is performed, and when data transmission by the communication system occurs when the broadcast reception system is not used, the voltage Control voltage drive using a conversion unit is enabled.

  In the mobile terminal device, the amplification unit can perform stepwise amplification, and when performing data transmission in a state where the broadcast reception system is not used, the voltage conversion is performed when the amplification amount is maximum. It is preferable that the power source voltage drive is performed by bypassing the unit, and that the voltage conversion unit is switched to drive the control voltage when the amplification amount is at least the minimum.

  The portable terminal device further includes a control unit that specifies an amplification amount of the amplification unit based on a power control signal received by the communication system, and the control unit is configured to supply power based on the specified amplification amount. It is preferable to switch between voltage driving and control voltage driving.

  Further, in order to solve the above problems, the mobile terminal device according to the present invention is a mobile terminal device having a communication system for performing data communication and a broadcast receiving system for receiving broadcast waves, wherein the communication system includes: An antenna, an amplification unit that amplifies a reception signal supplied from the antenna, and a voltage conversion unit that generates a control voltage for controlling an amplification amount of the amplification unit, and the amplification unit broadcasts in the broadcast reception system When data reception by the communication system occurs during reception of a wave, power supply voltage driving that bypasses the voltage conversion unit is performed, and when data reception by the communication system occurs in a state where the broadcast reception system is not used Control voltage drive using the voltage converter is enabled.

  In the mobile terminal device, the amplification unit can perform stepwise amplification, and when the data reception is performed when the broadcast reception system is not used, the voltage conversion is performed when the amplification amount is maximum. It is preferable that the power supply voltage drive is performed by bypassing the unit, and that the control voltage drive by the voltage conversion unit is switched when the amount of amplification is at least the minimum.

  Further, the mobile terminal device has a control unit that specifies an amplification amount of the amplification unit based on a signal intensity received by the communication system, and the control unit supplies a power supply voltage based on the specified amplification amount. It is preferable to switch between driving and control voltage driving.

  An amplifier circuit according to the present invention is an amplifier circuit used in a mobile terminal device having a communication system for performing data communication and a broadcast receiving system for receiving a broadcast wave in order to solve the above-described problem. An amplifying unit that amplifies a transmission signal and supplies the amplified signal to an antenna; and a voltage converting unit that generates a control voltage for controlling the amplification amount of the amplifying unit, wherein the amplifying unit is receiving broadcast waves in the broadcast receiving system When data transmission by the communication system occurs, power supply voltage driving bypassing the voltage conversion unit is performed, and when data transmission by the communication system occurs when the broadcast reception system is not used, the voltage conversion unit It is possible to drive a control voltage using

  According to the present invention, even when a communication function unit for calling is used while watching TV or radio, reception sensitivity of the TV or radio is not deteriorated.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In the following, a mobile phone will be described as a mobile terminal device, but the present invention is not limited to this, and may be a PHS (Personal Handy Phone System), a PDA (Personal Digital Assistant), a portable navigation device, a laptop computer, or the like. There may be.

  The basic structure of the mobile phone 1 will be described with reference to FIGS. FIG. 1 shows a front view of the mobile phone 1 in the opened state (first open state). 2A shows a left side view when the mobile phone 1 is opened, and FIG. 2B shows a right side view when the mobile phone 1 is opened. FIG. 3 shows a rear view in a state where the mobile phone 1 is opened.

  The mobile phone 1 includes an operation unit side body 2 and a display unit side body 3. The operation unit side body 2 and the display unit side body 3 are connected to each other via a connection unit 4 having a biaxial hinge mechanism, and the mobile phone 1 can be deformed into an open state and a closed state. In each closed state, the display unit side body 3 can be switched between a front state and a back state.

  Here, the closed state is a state in which both housings are arranged so as to overlap each other, and the open state is a state in which both housings are arranged so as not to overlap each other. In the open state, the display 30 disposed on the surface 3A of the display unit side body 3 to be described later and the operation key group 11 disposed on the front case 2a of the operation unit side body 2 are the same. The back state is a state in which the display 30 in the display unit side body 3 and the operation key group 11 in the operation unit side body 2 are disposed to face opposite sides. Say. Further, the front state in the closed state is a state in which the display 30 in the display unit side body 3 is arranged so as to face the operation key group 11 in the operation unit side body 2, and the back state in the closed state is In this state, the display 30 in the display unit side body 3 is exposed without facing the operation key group 11 in the operation unit side body 2.

  The outer surface of the operation unit side body 2 includes a front case 2a and a rear case 2b. The operation unit side body 2 exposes the operation key group 11 and the voice input unit (microphone) 12 to which the voice uttered by the user of the mobile phone 1 is input on the front case 2a side. Configured. Here, the operation key group 11 includes a function setting operation key 13 for operating various functions such as various settings, a telephone book function, and a mail function, and an input for inputting numbers of telephone numbers, characters such as mails, and the like. An operation key 14 and a determination operation key 15 for performing determination in various operations, scrolling in the up / down / left / right directions, and the like are configured. The microphone 12 is disposed on the outer end side opposite to the connecting portion 4 side in the longitudinal direction of the operation unit side body 2. That is, the microphone 12 is disposed on one outer end side when the mobile phone 1 is in the open state.

  Each key constituting the operation key group 11 is predetermined according to a deformed state such as an open / close state and a front / back state of the operation unit side body 2 and the display unit side body 3 and the type of application being activated. Function is assigned (key assignment). In the mobile phone 1, when each key constituting the operation key group 11 is pressed by the user, an operation corresponding to the function assigned to each key is executed.

  As shown in FIG. 2A, on one side surface of the operation unit side body 2, an interface 16 for transmitting / receiving data to / from an external device (for example, a host device), a headphone / microphone terminal 17, A removable external memory interface 18 and a charging terminal 19 for charging the battery are provided. The interface 16, the headphone terminal / microphone terminal 17, and the interface 18 are covered with a dust-proof cap that can be attached and detached when not in use.

  On the other side of the operation unit side body 2, as shown in FIG. 2B, a pair of side keys 20, an operation key 21 used at the time of imaging, and a broadcast wave whose radio wave reception angle can be adjusted. A receiving antenna 22 is arranged. A predetermined function is assigned to the side key 20 in accordance with a deformed state such as an open / close state and a front / back state of the operation unit side body 2 and the display unit side body 3 and the type of the activated application ( Key assignment). Here, similarly to the above, when the side key 20 is pressed by the user, an operation corresponding to the function assigned to the side key 20 in the mobile phone 1 is executed.

  As shown in FIG. 3, a camera unit 23 that captures an image of a subject and a light unit 24 that irradiates the subject with light are disposed in the rear case 2 b of the operation unit side body 2. The camera unit 23 and the light unit 24 are arranged on the connection unit 4 side in the operation unit side body 2. In addition, the rear case 2b in the operation unit side body 2 has an opening for mounting the battery in a battery housing portion, which will be described in detail later, and a battery lid 25 is disposed so as to close the opening. Is done.

  Moreover, the upper end part of the operation part side housing | casing 2 and the lower end part of the display part side housing | casing 3 are connected via the connection part 4 provided with a biaxial hinge mechanism, as shown in FIGS. As shown in FIG. 3, the sub operation key group 33 is arranged in a line in the width direction (short direction) of the mobile phone 1 on one surface (back surface) of the connecting portion 4. Each of the keys constituting the sub operation key group 33 depends on a deformed state such as an open / closed state or a front / back state of the operation unit side body 2 and the display unit side body 3 and the type of application being activated. A predetermined function is assigned (key assignment). In the mobile phone 1, when each key constituting the operation key group 11 is pressed by the user, an operation corresponding to the function assigned to each key is executed.

  Further, the display unit side body 3 is configured by a front case 3a and a rear case 3b on the outer surface. As shown in FIG. 1, a display 30 having a predetermined shape for displaying various information and a sound output unit 31 for outputting sound on the other party side of the call are exposed on the front case 3 a in the display unit side body 3. To be arranged. Here, the audio output unit 31 is disposed on the outer end side opposite to the connection unit 4 in the longitudinal direction of the display unit side body 3. That is, the audio output unit 31 is arranged on the other end side when the mobile phone 1 is in the open state.

  Further, as shown in FIG. 3, a sub-display 32 for displaying various types of information is disposed in the rear case 3 b of the display unit side body 3 so as to be exposed. Each of the display 30 and the sub-display 32 includes a liquid crystal panel, a drive circuit that drives the liquid crystal panel, and a light source unit such as a backlight that emits light from the back side of the liquid crystal panel.

  In the present embodiment, the cellular phone 1 that can be folded by the connecting portion 4 is described. However, the cellular phone 1 is not foldable, and the operation unit side body 2 and the display unit side body 3 are overlapped. One of the casings is slid in one direction, or one of the casings is rotated about an axis along the direction in which the operation unit side casing 2 and the display unit side casing 3 overlap. A rotating type (turn type), or a type (straight type) in which the operation unit side body 2 and the display unit side body 3 are arranged in one housing and does not have a connecting portion may be used.

  Next, each function of the mobile phone 1 will be described with reference to the functional block diagram of FIG. As shown in FIG. 4, the mobile phone 1 includes a first communication unit 100 that communicates with an external terminal, a broadcast wave reception unit 150 that receives a broadcast wave, and a second communication that communicates with an external terminal. Unit 200 and a processing unit 201 that performs predetermined processing. The battery 90 supplies power to the first communication unit 100, the broadcast wave receiving unit 150, the second communication unit 200, and the processing unit 201. In addition, the CPU 202 performs predetermined control on the first communication unit 100, the broadcast wave receiving unit 150, the second communication unit 200, and the processing unit 201.

  The first communication unit 100 includes an RFID (Radio Frequency Identification) unit 101, a magnetic field antenna unit 81 that communicates with an external device at a predetermined resonance frequency (for example, 13.56 MHz), and an adjustment antenna The capacitor 102 is provided.

  The magnetic field antenna unit 81 includes, for example, a coil wound in a plurality of times on a sheet made of a PET (polyethylene terephthalate) material, and is transmitted from an external device (reader / writer device) ( Is modulated at a predetermined resonance frequency.

The resonance frequency Fc is determined by the capacitance (C) value of the capacitor 102 and the inductance (L) value of the magnetic field antenna unit 81 according to the equation (1).
Fc = 1 / (2π√ (L × C)) (1)
In the first communication unit 100, the capacitance of the capacitor 102 is changed to adjust (tune) to a predetermined resonance frequency.

  The magnetic field antenna unit 81 receives a signal transmitted from the reader / writer device when the reader / writer device installed outside approaches a predetermined distance.

  Next, the configuration and operation of the broadcast wave receiving unit 150 will be described. The broadcast wave receiving unit 150 includes a broadcast wave receiving antenna 151, a tuner unit 152 that adjusts the antenna 151 to receive a predetermined signal, and a signal separation that separates the received signal into a video signal and an audio signal. Unit 153. For example, the antenna 151 is configured by a headphone cable or the like connected to the headphone / microphone terminal 17.

  The signal separation unit 153 supplies the separated video signal to the image processing unit 206 and supplies the separated audio signal to the sound processing unit 205. The image processing unit 206 performs predetermined processing on the video signal supplied from the signal separation unit 153, and outputs the processed signal to the display 30. Further, the sound processing unit 205 performs predetermined processing on the audio signal supplied from the signal separation unit 153 and outputs the processed signal from the speaker 207. In FIG. 4, one speaker 207 is shown, but it may be composed of a plurality of speakers.

  Further, in the above description, the broadcast wave receiving unit 150 has been described as receiving a broadcast wave from a TV broadcast. However, the broadcast wave reception unit 150 is not limited thereto, and may be a reception unit that receives a broadcast wave from a radio broadcast. It may be a receiver that receives both radio broadcasts.

  Next, the configuration and operation of the second communication unit 200 will be described. The second communication unit 200 is based on a predetermined communication method (for example, CDMA (Code Division Multiple Access) 2000_1 ×, etc.) and communicates with other communication terminal devices via the base station by telephone or mail. An antenna unit 80 (main antenna) that performs communication and the like, and a communication processing unit 203 that includes a transmission circuit 250 and a reception circuit 251 to be described in detail later are provided.

  The antenna unit 80 communicates with the base station in a predetermined use frequency band (for example, 800 MHz), for example. The use frequency band may be a frequency band other than 800 MHz. Further, the antenna unit 80 may be configured to be able to support a plurality of use frequency bands.

  The communication processing unit 203 demodulates the signal received by the antenna unit 80 by the reception circuit 251, supplies the processed signal to the processing unit 201, and modulates the signal supplied from the processing unit 201 by the transmission circuit 250. Processed and transmitted to the base station via the antenna unit 80.

  The processing unit 201 includes an operation key group 11, a microphone 12, a display 30, a sound output unit 31, a memory 204 in which predetermined data is stored, and a sound processing unit 205 that performs predetermined sound processing. An image processing unit 206 that performs predetermined image processing, a camera unit 23 that captures an image of a subject, a speaker 207 that outputs a ringtone, and the like.

  Here, a detailed configuration of the second communication unit 200 will be described. As shown in FIG. 5, in the second communication unit 200, the transmission circuit 250 and the reception circuit 251 are connected to the duplexer 252, and the duplexer 252 is connected to the antenna unit 80. The transmission circuit 250 includes a filter (band-pass filter) 253 that passes a predetermined frequency component, a power amplifier 254 that amplifies a signal that has passed through the filter 253 by a predetermined amount, and a power supply unit 255. . The power supply unit 255 also steps down the voltage supplied from the power supply to a predetermined voltage, and directly supplies the voltage supplied from the power supply bypassing the DC-DC converter 256 to the power amplifier 254. And a switching element (for example, a field effect transistor (FET)) 257 for supply. Note that the power supply unit 255 may be configured with separate components or may be integrated with an IC.

  In general, the CPU 202 controls the operation (amplification factor) of the power supply unit 255 according to the power control signal (reception power) transmitted from the base station when the transmission circuit 250 transmits a signal. . Here, the operation of the CPU 202 will be described.

  If the CPU 202 determines that the current transmission power is low based on the power control signal output from the base station, or if the CPU 202 determines that the reception power from the base station is low, the CPU 202 controls the transmission power to be large. In order to achieve this, the switching element 257 is controlled to be in the ON state, and the voltage supplied from the power supply is directly supplied to the power amplifier 254 by bypassing the DC-DC converter 256. At this time, the voltage supplied to the power amplifier 254 is, for example, the rated voltage of the battery 90 (for example, 4.3 to 3.3 V). Similarly, when the CPU 202 determines that the transmission power is moderate based on the power control signal or the received power from the base station, the CPU 202 steps down the voltage by a predetermined amount by the DC-DC converter 256 and reduces the voltage. Is supplied to the power amplifier 254. At this time, the voltage supplied to the power amplifier 254 is, for example, a constant voltage of 1.8V. If the CPU 202 determines that the transmission power is to be increased based on the power control signal or the received power from the base station, the DC-DC converter 256 reduces the voltage by a predetermined amount in order to reduce the transmission power. The voltage after step-down is supplied to the power amplifier 254. At this time, the voltage supplied to the power amplifier 254 is a constant voltage (for example, 1.3 V) that is even lower than when the received power is medium.

  The reception circuit 251 also filters a signal received by the antenna unit 80 with an LNA (Low Noise Amplifier) 258 that amplifies while reducing noise, and a filter that passes only a signal of a predetermined frequency component from the output signal of the LNA 258 ( Band-pass filter) 259.

  Further, when receiving data such as a TV program guide (EPG) by the transmission circuit 250 and receiving the data at the time of reception of the TV or the like, the CPU 202 deteriorates reception sensitivity of the TV or the like (for example, video The operation of the power supply unit 255 is controlled. Here, the operation of the CPU 202 will be described with reference to the flowchart shown in FIG. In the following, a case where the transmission circuit 250 requests acquisition of data such as EPG at the time of reception by a TV or the like will be described.

  In step ST1, the CPU 202 determines whether the broadcast wave receiving unit 150 is activated and a TV or the like is being used. When the TV or the like is activated, the process proceeds to step ST2, and when the TV or the like is not activated, the process of step ST1 is repeated.

  In step ST2, when the CPU 202 requests the transmission circuit 250 to acquire data such as EPG during reception of a TV or the like, whether or not the transmission output power by the transmission circuit 250 is a predetermined power value, that is, a power control signal is used. Based on this, it is determined whether low power or medium power is required as transmission power, or whether the current received power at the local station is a predetermined power (medium power or large power). When the transmission power is the predetermined power (voltage step-down operation by the DC-DC converter 256 is executed), the process proceeds to step ST3.

  In step ST3, the CPU 202 executes a bypass mode (a mode in which the voltage step-down operation by the DC-DC converter 256 is not executed), and operates the switching element 257 in the ON state. When the switching element 257 is switched to the ON state, the power supply voltage supplied from the battery 90 bypasses the DC-DC converter 256 and is directly supplied to the power amplifier 254. At this time, the voltage supplied to the power amplifier 254 is the rated voltage of the battery 90 (for example, 4.3 to 3.3 V).

  There are various methods for realizing the control by the CPU 202 described above. For example, a method of setting a flag when the broadcast wave receiving unit 150 is driven, or a broadcast wave receiving unit during data transmission by the transmission circuit 250. There is a method for confirming whether or not 150 is used.

  Here, a method of setting a flag when driving the broadcast wave receiving unit 150 will be described with reference to FIG. Note that the base application is already activated. In step ST2, an example is shown in which the process proceeds to step ST3 only at a predetermined transmission power. However, in step ST1, when a TV or the like is used, all the processes may be performed to step ST3.

  Based on the operation signal supplied from the operation key group 11 (command for requesting viewing of TV), the base application transmits a signal S1 for prompting activation to the TV application.

  The TV application is activated in response to the signal S1, and returns a signal S2 indicating activation to the base application.

  The base application sets a predetermined flag (a flag indicating that the TV application is activated) in the memory 204 according to the signal S2.

  In addition, the TV application transmits a signal S3 indicating that the reception of the TV broadcast is started to the broadcast wave receiving unit 150.

  The TV application confirms whether or not a predetermined flag is set with reference to the memory 204, and then uses the signal S4 for requesting reception of data (such as EPG) associated with the currently viewed content as the base application. Send to. In this embodiment, since a predetermined flag is set in the memory 204, the above-described step ST3 is executed. Therefore, the bypass mode described above is executed, and the power supply voltage is supplied directly from the battery 90 to the power amplifier 254.

  In response to the signal S4, the base application supplies the communication processing unit 203 with a data acquisition request signal S5 accompanying the content.

  The communication processing unit 203 outputs a predetermined request signal S6 to the base station in response to the signal S5.

  When the communication processing unit 203 acquires data accompanying the content, the communication processing unit 203 transmits an ACK signal S7 indicating that the data has been acquired to the base station.

  The communication processing unit 203 supplies the base application with a report signal S8 indicating that data associated with the content has been acquired.

  In response to the signal S8, the base application supplies the TV application with a signal S9 indicating that data associated with the content has been acquired.

  Further, the base application transmits a signal S10 for prompting the end to the TV application based on the operation signal supplied from the operation key group 11 (command for requesting the end of TV viewing).

  In response to the signal S10, the TV application transmits a signal S11 for ending the reception of the TV broadcast to the broadcast wave receiving unit 150. Also, the TV application ends after supplying the signal S11 to the broadcast wave receiving unit 150.

  In addition, the mobile phone 1 according to the present invention can increase the current consumption as much as possible, even when a transmission request or reception of data by the second communication unit 200 occurs when the broadcast wave reception unit 150 receives a broadcast wave, The power amplifier 254 and the LNA 258 can be controlled while avoiding the generation of noise.

  Here, a case where reception is performed by the second communication unit 200 will be described. The receiving circuit 251 of the second communication unit 200 includes a low-noise amplifier (LNA) 258 that amplifies a received signal that has passed through the duplexer 252 by a predetermined amount, a filter (bandpass filter) 259 that passes a predetermined frequency component, And a power supply unit 255. In FIG. 5, a supply line from the power supply unit 255 to the LNA 258 is omitted.

  Further, the CPU 202 generally controls the operation of the power supply unit 255 (the amplification factor of the LNA 258) according to the received power from the base station when receiving a signal by the receiving circuit 251. Here, the operation of the CPU 202 will be described.

  When the CPU 202 determines that the received power from the base station is low, the CPU 202 controls the switching element 257 to be in an ON state and controls the received power to be supplied from the power source bypassing the DC-DC converter 256. Voltage is directly supplied to the LNA 258. At this time, the voltage supplied to the LNA 258 is, for example, the rated voltage of the battery 90 (for example, 4.3 to 3.3 V). When the CPU 202 determines that the received power from the base station is medium, the CPU 202 steps down the voltage by a predetermined amount by the DC-DC converter 256 and supplies the stepped down voltage to the LNA 258. At this time, the voltage supplied to the LNA 258 is, for example, a constant voltage of 1.8V. When the CPU 202 determines that the received power from the base station is large, the DC-DC converter 256 steps down the voltage by a predetermined amount and controls the stepped down voltage to the LNA 258 in order to control the amplification factor to be small. To do. At this time, the voltage supplied to the LNA 258 is a constant voltage (eg, 1.3 V) that is even lower than when the received power is medium.

  In this way, the mobile phone 1 according to the present invention uses the broadcast wave receiving unit 150 to watch TV, radio, or the like, while receiving predetermined data (for example, information on a broadcast program (a program title being broadcast) And the name of the performer, the name of the song being played, etc.)), and when the data is received, the voltage step-down processing by the DC-DC converter 256 is not performed, and the power amplifier 254 is always directly from the battery 90. Since power is supplied to the receiver, there is no influence of harmonic components due to the switching frequency of the DC-DC converter 256, deterioration of reception sensitivity of TV, radio, etc. can be avoided, and high-quality video and audio can be provided. Can do.

  In addition, the mobile phone 1 according to the present invention can increase the current consumption as much as possible, even when a transmission request or reception of data by the second communication unit 200 occurs when the broadcast wave reception unit 150 receives a broadcast wave, The power amplifier 254 and the LNA 258 can be controlled while avoiding the generation of noise.

  In the present embodiment, the explanation is made on the assumption that an analog TV broadcast is received. However, the present invention is effective even when a digital TV broadcast is received. In the mobile phone 1 according to the present invention, the voltage step-down process by the DC-DC converter 256 is not performed when digital TV broadcasting is received, and power is always supplied directly from the battery 90 to the power amplifier 254 (LNA 258). Therefore, there is no influence by the harmonic component due to the switching frequency of the DC-DC converter 256, packet loss can be avoided, and high-quality video can be provided.

The front view in the state (1st open state) which opened the mobile telephone is shown. (A) The left view in the state which opened the mobile phone is shown, (B) The right view in the state which opened the mobile phone is shown. The rear view in the state which opened the mobile telephone is shown. It is a block diagram which shows the function of the mobile telephone which concerns on this invention. It is a block diagram which comprises the 2nd communication part with which the mobile telephone shown in FIG. 4 is equipped. It is a flowchart with which it uses for description about control of CPU in the case of requesting acquisition of predetermined data at the time of reception of TV etc. It is a timing chart with which it uses for description about the method of raising a flag at the time of the drive of a receiving module part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile phone 2 Operation part side housing | casing 2a, 3a Front case 2b, 3b Rear case 3 Display part side housing | casing 4 Connection part 11 Operation key group 12 Microphone 23 Camera part 30 Display 31 Audio | voice output part 80 Antenna part 81 Magnetic field antenna part 100 First communication unit 101 RFID unit 102 Adjustment capacitor 150 Broadcast wave reception unit 151 Antenna 152 Tuner unit 153 Signal separation unit 200 Second communication unit 201 Processing unit 202 CPU
203 Communication Processing Unit 204 Memory 205 Sound Processing Unit 206 Image Processing Unit 207 Speaker 250 Transmission Circuit 251 Reception Circuit 252 Demultiplexer 253 Filter 254 Power Amplifier 255 Power Supply Unit 256 DC-DC Converter 257 Switching Element 258 LNA
259 filter

Claims (7)

A mobile terminal device having a communication system for performing data communication and a broadcast receiving system for receiving broadcast waves,
The communication system includes an antenna, an amplification unit that amplifies a transmission signal and supplies the signal to the antenna, and a voltage conversion unit that generates a control voltage for controlling an amplification amount of the amplification unit,
The amplifying unit is driven by a power supply voltage bypassing the voltage converting unit when data transmission by the communication system occurs while receiving a broadcast wave in the broadcast receiving system, and the broadcast receiving system is not used In the portable terminal device, the control voltage drive using the voltage converter is enabled when data transmission by the communication system occurs. The mobile terminal device according to claim 1,
The amplification unit is capable of stepwise amplification, and when performing data transmission in a state where the broadcast reception system is not used, when the amplification amount is maximum, the voltage conversion unit is bypassed to supply voltage A portable terminal device that is driven and switched to drive a control voltage by the voltage converter when the amount of amplification is at least minimum. The portable terminal device according to claim 1 or 2,
Based on a power control signal received by the communication system, having a control unit for specifying the amplification amount of the amplification unit,
The control unit switches between power supply voltage driving and control voltage driving based on the specified amplification amount. A mobile terminal device having a communication system for performing data communication and a broadcast receiving system for receiving broadcast waves,
The communication system includes an antenna, an amplification unit that amplifies a reception signal supplied from the antenna, and a voltage conversion unit that generates a control voltage for controlling an amplification amount of the amplification unit,
The amplifying unit is driven with power supply voltage bypassing the voltage converting unit when data reception by the communication system occurs while receiving a broadcast wave in the broadcast receiving system, and the broadcast receiving system is not used In the portable terminal device, the control voltage drive using the voltage conversion unit is enabled when data reception by the communication system occurs. The mobile terminal device according to claim 4,
The amplification unit is capable of stepwise amplification, and when receiving data in a state where the broadcast reception system is not used, when the amplification amount is maximum, the voltage conversion unit is bypassed to supply voltage. The mobile terminal device is switched so that the control voltage is driven by the voltage converter when the amplification amount is at least minimum. The portable terminal device according to claim 4 or 5,
Based on the signal strength received by the communication system, having a control unit for specifying the amplification amount of the amplification unit,
The said control part is a portable terminal device characterized by switching a power supply voltage drive and a control voltage drive based on the specified amplification amount. An amplifier circuit used in a portable terminal device having a communication system for performing data communication and a broadcast receiving system for receiving broadcast waves,
An amplification unit that amplifies the transmission signal and supplies the amplified signal to the antenna; and a voltage conversion unit that generates a control voltage for controlling the amplification amount of the amplification unit,
The amplifying unit is driven by a power supply voltage bypassing the voltage converting unit when data transmission by the communication system occurs while receiving a broadcast wave in the broadcast receiving system, and the broadcast receiving system is not used In the amplifier circuit, when the data transmission by the communication system occurs, it is possible to drive the control voltage using the voltage converter.

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