JP2011176659A - Noise sensor phase amplitude adjusting circuit and radio equipment employing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adjusting circuit canceling a plurality of noises in a short period of time even when the noises interfere a receiving antenna in a system for obtaining high reception quality by canceling noises generated inside radio equipment. <P>SOLUTION: In accordance with a change in casing state, the route of a phase amplitude change means connected to a first signal switching means 23a and a second signal switching means 23b is switched in accordance with a control signal from a control section 36, and a phase amplitude adjusting means 31 is adjusted. Thus, the radio equipment can be provided which reduces reception sensitivity deterioration even during noise interference caused by a plurality of noises. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates generally to a wireless device including a noise removal circuit for improving reception sensitivity deterioration of a receiving device, and more particularly to a general mobile phone terminal used for broadcasting and wireless communication.

  In a receiving terminal that receives radio signals used for communication and broadcasting, built-in circuit functions such as a CPU and a memory, an arithmetic circuit that processes the received signal, and a signal generated by a reference clock generator that operates them and its harmonics There is a problem of internal interference in which the wave component becomes an interference component of the received signal in the radio frequency band of the received signal and degrades the quality of the received signal.

  In recent years, the functions of receiving terminals have been increased, the circuit functions built in the receiving terminals have increased, the signals handled inside have been digitized, and the processing speed and the amount of information to be processed have also increased. In addition, terminals are required to be miniaturized, and antennas that receive received signals are also becoming smaller and built-in. For this reason, the interference component generated in the radio frequency band of the reception signal generated inside increases, and the coupling between the reception antenna and the circuit that generates the interference component increases due to downsizing, thereby further increasing the problem of internal interference. It is getting bigger.

  To address this issue, optimize circuit layout that does not degrade received signal quality, and add internal interference countermeasure components such as bypass capacitors, choke coils, filters, and shields to suppress unnecessary transmission of interference components. This increases the number of design man-hours, the cost, and the size of the equipment.

  In order to solve the problem of internal interference due to noise, there are conventional techniques disclosed in Patent Document 1 and Patent Document 2, for example, as a technique for suppressing noise.

  In Patent Document 1, for a wireless information terminal connected to a PC, interference noise from the inside of the PC is received by the auxiliary antenna, the phase and amplitude are adjusted, and the interference noise received by the wireless signal antenna is the same. An example of a configuration is disclosed in which the addition is performed with an amplitude opposite phase to cancel the received sensitivity deterioration.

  In Patent Document 2, for a mobile phone terminal, interference noise radiated from a plurality of noise sources is extracted by each noise sensor unit to cancel the noise received by the antenna, and the phase and amplitude are adjusted according to the change in state. A configuration example for optimizing the above is disclosed.

JP-A-11-27160 JP 2008-244987 A

  However, in the conventional configuration, when a plurality of interference noises are in the same frequency band and the phases and amplitudes of the noises detected by the respective noise sensor units are adjusted to cancel the plurality of interference noises, radiation from the other noise source is performed. In the state where the generated noise remains, it is difficult to determine whether or not the cancellation can be performed, and it is difficult to optimize the adjustment value.

  In addition, for interference noise from multiple noise sources, providing a phase adjustment circuit and amplitude adjustment circuit for each noise sensor unit in order to individually adjust the phase and amplitude for each noise sensor unit will result in component costs and mounting area due to circuit enlargement. There are problems such as an increase in the time and adjustment time.

  In order to solve the above-described problem, the present invention provides the first and second signal switching means on one side in any one of the two states taken by the noise that circulates from the plurality of noise sources to the antenna element. Connected to the other side in the other case, the control unit resets the setting value of the phase amplitude adjusting means based on the demodulation result of the demodulating unit so as to increase the reception sensitivity, thereby reducing a plurality of interference noises. The phase and amplitude adjustment values for canceling can be obtained at high speed. As a result, it is possible to provide a radio device that can reduce reception sensitivity degradation even during internal interference due to multiple noises.

  In order to solve the above-described conventional problems, the noise sensor phase amplitude adjustment circuit and the radio using the noise sensor according to the present invention can be used in any one of two states in which noise sneaking into the antenna element from a plurality of noise sources is taken. Connects the first and second signal switching means to one side, and in the other case to the other side, and the control unit receives the set value of the phase amplitude adjusting means based on the demodulation result of the demodulation unit as the reception sensitivity. It has a configuration that resets so that it becomes higher. With this configuration, phase and amplitude adjustment values for canceling a plurality of interference noises can be obtained in a short time.

  As described above, the noise sensor phase / amplitude adjustment circuit of the present invention and the radio using the same can obtain a phase / amplitude adjustment value for canceling a plurality of interference noises in a short time. It is possible to provide a radio device that can reduce reception sensitivity deterioration even when noise interference occurs.

1 is a block diagram of a noise sensor phase amplitude adjustment circuit according to Embodiment 1 of the present invention. Configuration diagram of noise extraction means in Embodiment 1 of the present invention Block diagram of the conventionally proposed noise cancellation unit The figure explaining the adjustment time in Embodiment 1 of this invention Block diagram of a noise sensor phase amplitude adjustment circuit in Embodiment 2 of the present invention

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram of the noise sensor phase amplitude adjustment circuit of the first embodiment.

  In FIG. 1, the noise sensor phase amplitude adjusting circuit includes a first noise source 10, a second noise source 11, a first noise extraction means 20, a second noise extraction means 21, a first signal switching means 23a, and a second signal switching means. 23b, first phase amplitude changing means 25a, second phase amplitude changing means 25b, first signal adding means 30, phase amplitude adjusting means 31, antenna element 32, second signal adding means 33, demodulator 34, noise sensor phase amplitude adjusting The unit 35 and the control unit 36 are included.

  FIG. 1 shows a reception system in a wireless device such as a mobile phone terminal, and shows a circuit configuration of a one-segment reception system as a wireless system. The antenna element 32 is composed of a monopole antenna, PIFA, housing dipole antenna, etc., and receives one-seg broadcast waves and cellular band radio signals, while noise radiated from various noise sources in the radio as interference noise. Receive at the same time. If such interference noise exists at the same frequency at a high level, the S / N in the desired wave band deteriorates, and the radio device cannot obtain the designed reception sensitivity.

  First, the behavior of interference noise and its phase and amplitude relationship will be described.

  The first interference noise 12 radiated from the first noise source 10 is received by the antenna element 32 and wraps around the second signal adding means 33 with the transfer function s12. The second interference noise 13 radiated from the second noise source 11 is received by the antenna element 32 and wraps around the second signal adding means 33 with the transfer function s13.

  On the other hand, the first noise extraction means 20 is arranged in the vicinity of the first noise source 10 and extracts noise radiated from the first noise source 10. The second noise extraction means 21 is arranged in the vicinity of the second noise source 11 and extracts noise radiated from the second noise source 11.

  FIG. 2 is a diagram showing a plurality of examples of the first noise extraction means 20 or the second noise extraction means 21.

  FIG. 2A is an example in which a monopole antenna element 42 is arranged on the package of the LSI 41 assuming that the noise source is the LSI 41 mounted on the substrate. Here, the monopole antenna element 42 is configured to be affixed to the LSI 41. As another configuration proposal, in the case where there is a casing or a shield case on the upper portion of the LSI 41 and there is a gap, the monopole antenna element 42 may be attached to the casing or shield case side. In this case, it is desirable that the distance between the noise source and the noise extracting means is about 1 mm or less. The monopole antenna element 42 extracts noise radiated from the LSI 41 by electromagnetic coupling and transmits the noise via a coaxial line 43 or a microstrip line. Although FIG. 2A describes the monopole antenna element 42, it may be configured with a loop antenna element.

  FIG. 2B is an example in which another wiring pattern 45 is disposed in proximity to the noise source, assuming that the wiring pattern 44 is connected to the terminal of the LSI 41 and extracting noise radiated from the wiring pattern 44. Here, the wiring pattern 44 is disposed in the L1 layer of the multilayer substrate, and the wiring pattern 45 is disposed in the inner layer such as the L2 layer of the multilayer substrate, and noise is extracted by electromagnetic field coupling. As another configuration proposal, a configuration in which the wiring pattern 44 and the wiring pattern 45 are arranged close to each other in the same layer and run in parallel may be used. In the case where the wiring patterns are arranged with a space therebetween, it is desirable that the space between the wiring patterns in the same layer or in the same layer is about 1 mm or less.

  FIG. 2C is an example in which another wiring pattern 46 is combined to extract noise radiated from the wiring pattern 44 assuming that the noise source is the wiring pattern 44 connected to the terminal of the LSI 41. The wiring pattern 46 is connected to the wiring pattern 44 via the chip component 47. Here, the chip component 47 is a capacitor, an inductor, or a high resistance, and a constant in a range that does not affect the operation of the signal transmitted by the wiring pattern 44 is selected.

  The first phase amplitude changing unit 25a and the second phase amplitude adjusting unit 25b are composed of, for example, a phase shifter and an amplifier, and change the phase and amplitude of the input noise signal. Alternatively, the first phase amplitude changing unit 25a and the second phase amplitude adjusting unit 25b may be configured as a lumped constant circuit, for example, a combination of a fixed filter circuit using a chip component and a fixed attenuator. Alternatively, as a distributed constant line and a lumped constant circuit, for example, a microstrip line or a combination of a coaxial line and a fixed attenuator may be used.

  The first signal switching unit 23a and the second signal switching unit 23b are configured by a high frequency switch or the like. The first signal switching unit 23 a and the second signal switching unit 23 b are switched in conjunction with each other according to a command from the control unit 36, and are connected between the second noise extraction unit 21 and the first signal addition unit 30. The amplitude changing unit 25a or the second phase amplitude changing unit 25b is switched.

  The first signal adding means includes first noise extracting means 20 and second signal switching means in which the phase and amplitude are changed by the first phase amplitude changing means 25a or the second phase amplitude changing means 25b to the second noise extracting means 21. 23b is combined with the output from the phase amplitude adjusting unit 31.

  As for the setting and adjustment method of the value of the phase amplitude adjusting means 31, noise that interferes in one reception band (reception channel) having a one-segment broadcasting wave will be described.

  First, the condition that the noise source is only the second noise source 11 will be described. Here, the first phase amplitude changing means 25a and the second phase amplitude changing means 25b are each a combination of a fixed filter circuit and a fixed attenuator, and have a phase shift amount and an attenuator amount as fixed values.

  The second interference noise 13 radiated from the second noise source 11 wraps around the second signal adding means 33 through the antenna element 32 with the transfer function s13. The transfer function s13 is a parameter determined by the position and structure of the antenna element 32 and the position and structure of the second noise source 11, and changes depending on, for example, the shape of the terminal. Here, the first signal switching unit 23a and the second signal switching unit 23b will be described as selecting the path of the first phase amplitude changing unit 25a. In order to cancel the second interference noise 13, the phase amplitude adjustment is performed by the first phase amplitude changing unit 25 a and the phase amplitude adjusting unit 31 extracted by the second noise sensor 21 at a frequency within a certain reception band. It is necessary that the transfer function s21 of interference noise in the path up to the input to the second signal adding means 33 has the same amplitude and opposite phase with respect to s13. In actual adjustment, the first phase / amplitude changing circuit 25a decides a value as a fixed value, adjusts the phase and amplitude by the phase / amplitude adjusting circuit 31, and becomes the same amplitude and opposite phase by the second signal adding means 33. Thus, the second interference noise 13 is canceled.

  Here, regarding the phase amplitude adjustment circuit 31, the phase and amplitude between the input and output of the phase amplitude adjustment circuit 31 can be varied by external control. The demodulator 34 has a function of demodulating the received signal and calculating C / N, BER, PER, and the like. The control unit 36 controls the noise sensor phase amplitude adjustment unit 35 based on the information from the demodulation unit 34, and changes the phase and amplitude adjustment values of the phase amplitude adjustment circuit 31 so as to improve the quality of the received signal.

  Next, the conditions under which a plurality of noises, that is, the first noise source 10 and the second noise source 11 can be canceled simultaneously will be described. Here, it is assumed that the first interference noise 12 radiated from the first noise source 10 wraps around the second signal adding means 33 through the antenna element 32 with the transfer function s12. The transfer function of interference noise in the path from the first noise sensor 20 through which the phase amplitude is adjusted by the phase amplitude adjusting means 31 through the first signal adding means 30 and inputted to the second signal adding means 33 is expressed as s20. And

  In a certain state, when interference noise from the first noise source 10 and the second noise source 11 is canceled at the same time, the difference between s13 viewed from the transfer function s12 and the difference between s21 viewed from the transfer function s20 are approximately the same amplitude inverse. What is necessary is just to make it become a phase. That is, if the difference is the same amplitude and opposite phase, the interference noises 12 and 13 can be canceled simultaneously by optimizing the phase and amplitude in the third phase amplitude adjustment circuit 31. That is, the circuit constants of the fixed filter circuit and the fixed attenuator in the first phase / amplitude changing means 25a may be set in advance so that the difference between the transfer functions is almost the same amplitude and opposite phase. For example, when the use frequency band in all channels is a wide band such as a one-segment broadcasting wave, it is desirable to match the constant setting of the transfer function difference over a wide band.

  On the other hand, FIG. 3 shows a configuration of a conventionally proposed noise canceling unit. In FIG. 3, a noise canceling unit 100, a noise generating unit 101, noise sources 102a to 102c, noise sensors 103a to 103c, BPFs 104a to 104c, phase adjusting circuits 105a to 105c, delay adjusting circuits 106a to 106c, amplifiers 107a to 107c, The switch units 108 a to 108 c, the coupler 109, the one-seg receiving antenna 110, the coupler 111, and the one-seg receiver 112 are configured.

  The noise cancellation adjustment method in the conventional configuration of FIG. 3 will be described in the case where there are a plurality of noise sources. First, noise radiated from the noise source 102a is detected by the noise sensor 103a, and the phase and amplitude of the noise detected by the phase adjustment circuit 105a, the delay adjustment circuit 106a, and the amplifier 107a are adjusted. As an adjustment method, the phase and amplitude of the one-seg broadcast wave received by the one-seg receiver 112 are adjusted so as to reduce errors while watching C / N, BER, PER, or the like. When the adjustment of the noise source 102a is completed, the next noise source 102b is similarly adjusted. This is repeated for the number of noise sources receiving interference. However, such adjustment can be performed with time-stable noise such as CW, and burst noise such as a memory bus with a large time variation that is not stable is very difficult to isolate, and C / N There is a possibility that the adjustment cannot be made while looking at the above, etc., so that it does not converge.

  FIG. 4 shows the effect of the adjustment. Here, the solid line indicates the control time and the C / N characteristic of the received signal in the present invention, and the dotted line indicates the control time and the C / N characteristic of the received signal in the conventional configuration.

  In the present invention, when the adjustment is started, the first signal switching unit 23a and the second signal switching unit 23b are switched to the optimum path so that the relative difference between the phase and the amplitude is adjusted and the antenna element 32 is spilled. The phase and amplitude are adjusted by the phase / amplitude adjustment means 31 so that the transfer function has substantially the same amplitude and opposite phase between the interference noise and the noise detected by the noise extraction means. In this configuration, since the phase and amplitude adjustment for canceling the interference noise radiated from all the noise sources is performed at the same time, the adjustment can be completed at one time regardless of the number of target noise sources. .

  In the conventional configuration, when there are three noise sources (102a, 102b, 102c), the adjustment is performed in order. For this reason, the total adjustment time becomes the number of noise sources times the adjustment time for one noise source, so that the number of target noise sources increases.

  On the other hand, consider the effect when the housing state changes. The case will be described assuming that the terminal shape is a foldable mobile phone terminal. Consider a case where the open terminal shape changes to a closed state. At this time, the transfer functions in the open state are S12, S13, S20, and S21, and the corresponding transfer functions in the closed state are S12a, S13a, S20a, and S21a, respectively. When the terminal shape changes from the open state to the closed state, the control unit 36 sends a control signal corresponding to the closed state to the noise sensor phase amplitude adjusting unit 35. The first signal switching unit 23a and the second signal switching unit 23b switch paths so as to be connected to the second phase amplitude changing unit 25b by a control signal from the control unit 36.

  When simultaneously canceling noises radiated from the first noise source 10 and the second noise source 11, the difference between s13a seen from the transfer function s12a and the difference between s21a seen from the transfer function s20a are almost in phase with the same amplitude. What should I do? That is, the circuit constants of the fixed filter circuit and the fixed attenuator in the second phase amplitude changing unit 25b may be set in advance so that the difference between the transfer functions is almost the same amplitude and opposite phase.

  In the noise sensor phase / amplitude adjustment circuit and the radio device configured as described above, the first and second signals in the case of any one of the two states taken by the noise sneaking into the antenna element from a plurality of noise sources. The switching means is connected to one side, and in the other case, connected to the other side, and the control unit resets the set value of the phase amplitude adjusting means based on the demodulation result of the demodulator so that the reception sensitivity is increased. have. Therefore, phase and amplitude adjustment values for canceling a plurality of interference noises can be obtained in a short time, and reception sensitivity deterioration can be reduced even when noise interference is caused by a plurality of noises.

  The configuration of the noise sensor phase / amplitude adjustment unit 35 having two noise sources has been described, but the same applies to a configuration having three or more noise sources, and the adjustment system from the noise extraction unit to the first signal addition unit is changed to noise. As many as the number of sources are prepared and synthesized by the first signal adding means.

  In addition, the configuration in which the signal switching means connected to each noise extracting means has two phase amplitude changing means to be switched and connected has been described. However, the configuration is not limited to two, and even when there are three or more housing states The same effect can be expected with a configuration in which the phase amplitude changing means is prepared for the number of states and the path is switched. Similar effects can be expected not only in the folding type but also in the sliding type, double open type, and swivel type.

  Also, the above describes the difference in the terminal shape as the housing state, but the phase amplitude changing means prepared in advance is selected in accordance with the change of the internal state setting such as the brightness setting of the display display such as the LCD or the moving image standby setting. The same effect can be expected for the configuration.

  Also, the above is a description of a one-seg reception system as a wireless system. However, there is a transfer function of noise radiated from a noise source according to application switching or operation change such as e-mail, one-seg and full-seg broadcasting, Bluetooth, and wireless LAN. A similar effect can be expected for the configuration in which the phase amplitude changing means prepared in advance is selected on the assumption of the change.

  In the above description, the configuration in which the first noise extraction unit 20 to the first signal addition unit 30 are directly connected has been described. However, the signal switching disposed between the second noise extraction unit 21 and the first signal addition unit 30 is described. The same effect can be expected for the configuration in which the means and at least two phase amplitude changing means are arranged between the first noise extracting means 20 and the first signal adding means 30.

  In the above description, the noise extraction unit is arranged for all possible noise sources. However, in the state where the amount of noise radiation is small or the noise is no longer radiated due to an application change or the like, the noise extraction unit performs the first operation. The same effect can be expected for a configuration in which the connection to the signal adding means is disconnected and the target noise extracting means is not used.

Further, when the transfer functions between the respective phase amplitude changing means have similar characteristics, the same effect can be expected for the configuration in which the phase amplitude changing means having the similar characteristics are combined together. The same effect can be expected for a configuration in which only the phase of the phase / amplitude changing means or only the amplitude is close to each other, and the phase / amplitude changing means is shared in common only for the portions having close characteristics.
(Embodiment 2)
FIG. 5 is a block diagram of the noise sensor phase amplitude adjustment circuit of the second embodiment. In FIG. 5, the same components as those in FIG.

  In FIG. 5, the noise sensor phase amplitude adjustment circuit is composed of low noise amplification means 37.

  The behavior of interference noise will be described assuming a circuit configuration of a one-segment reception system as a wireless system. In FIG. 5, the interference noise 12 from the first noise source 10 is received by the antenna element 32 and amplified by the low noise amplification means 37. Thereby, at the input of the second signal adding means 33, the ratio of the desired wave C1 and the interference noise N1 is C1 / N1, and the ratio of the interference noise N1 and the thermal noise Nt1 is N1 / Nt1. The noise signal extracted by the first noise extraction means 20 is subjected to amplitude and phase adjustment, and the thermal noise Nt2 determined from the noise signal N2 and the noise sensor phase amplitude adjustment unit 35 is the second in the ratio / N2 / Nt2. The signal is added to the signal adding means 33. Here, the interference noise N1 and the noise signal N2 are added and canceled as the same amplitude and opposite phase. Therefore, the ratio between the desired wave input to the demodulator 34 and the total noise component is C1 / (Nt1 + Nt2).

  On the other hand, when there is no low noise amplifying means 37 as shown in FIG. 1, the ratio of the desired wave C1 ′ input to the demodulator 34 and the interference noise N1 ′ is C1 ′ / N1 ′, the interference noise N1 ′ and the noise / The ratio with Nt1 ′ is / N1 ′ / Nt1 ′. Further, the noise signal N2 'at that time and the thermal noise Nt2' determined from the noise sensor phase amplitude adjusting unit 35 are added to the second signal adding means 33 at a ratio / N2 '/ Nt2'. Therefore, the ratio between the desired wave input to the demodulator 34 and the total noise component is C1 '/ (Nt1' + Nt2 ').

  Here, in the configuration having the low noise amplifying means 37, since the interference noise N1 is amplified, the noise signal N2 also becomes large. On the other hand, in the configuration without the low noise amplifying means 37, the noise signal N2 'is small, so that N2'≈Nt2'.

  That is, at the input stage of the demodulator 34, C1 / (Nt1 + Nt2)> C1 '/ (Nt1' + Nt2 '), so that the thermal noise after the noise extraction means becomes more dominant when the desired wave is a weak electric field.

  With the noise sensor phase amplitude adjustment circuit configured as described above, a noise canceling effect can be effectively obtained even when the desired wave is a weak electric field. Therefore, phase and amplitude adjustment values for canceling a plurality of interference noises can be obtained in a short time, and reception sensitivity deterioration can be reduced even when noise interference is caused by a plurality of noises.

  The noise sensor phase / amplitude adjustment circuit and the radio using the same according to the present invention can obtain a phase / amplitude adjustment value for canceling a plurality of interference noises in a short time, and also at the time of noise interference due to a plurality of noises. It is useful as a radio device that reduces reception sensitivity degradation.

DESCRIPTION OF SYMBOLS 10 1st noise source 11 2nd noise source 12 1st interference noise 13 2nd interference noise 20 1st noise extraction means 21 2nd noise extraction means 23a 1st signal switching means 23b 2nd signal switching means 25a 1st phase amplitude change Means 25b Second phase amplitude changing means 30 First signal adding means 31 Phase amplitude adjusting means 32 Antenna element 33 Second signal adding means 34 Demodulating part 35 Noise sensor phase amplitude adjusting part 36 Control part 37 Low noise amplifying means 41 LSI
42 Monopole antenna element 43 Coaxial line 44 Wiring pattern 45 Wiring pattern 46 Wiring pattern 47 Chip component 100 Noise canceling part 101 Noise generating part 102a, b, c Noise source 103a, b, c Noise sensor 104a, b, c BPF
105a, b, c Phase adjustment circuit 106a, b, c Delay adjustment circuit 107a, b, c Amplifier 108a, b, c Switch unit 109 Combiner 110 One-seg receiving antenna 111 Combiner 112 One-seg receiver

Claims (6)

In a noise sensor phase / amplitude adjustment circuit and a radio using the same, it is known that the noise that wraps around the antenna element from a plurality of noise sources changes into two states.
A control unit for detecting the two states;
A first noise source that is one of the plurality of noise sources;
A second noise source having a different source from the first noise source;
First noise extraction means arranged near the first noise source for detecting noise;
Second noise extraction means arranged in the vicinity of the second noise source for detecting noise;
A first signal switching unit connected to the second noise extraction unit and switching a connection destination according to a command from the control unit;
First phase amplitude changing means for changing the phase and amplitude by a preset fixed value connected to the first signal switching means;
A second phase amplitude changing means connected to the first signal switching means, wherein at least one of a phase and an amplitude is set at a fixed value different from the first phase amplitude changing means;
Second signal switching means connected to the first phase amplitude changing means and the second phase amplitude changing means and interlocking with the first signal switching means;
A first signal adding means connected to the first noise extracting means and the second signal switching means to synthesize both signals;
Phase and amplitude adjusting means for adjusting the phase and amplitude connected to the first signal adding means according to a command from the control unit;
An antenna element;
A second signal adding means connected to the antenna element and the phase amplitude adjusting means for synthesizing both signals;
A demodulator connected to the second signal adding means,
The control unit connects the first and second signal switching means to one side in either case of the two states, and connects to the other side in the other case. A noise sensor phase / amplitude adjustment circuit and a radio using the same, wherein the set value of the phase / amplitude adjustment means is reset so as to increase the reception sensitivity based on the demodulation result of the demodulator. The noise sensor phase amplitude adjustment circuit and the radio using the same are mobile phones whose casing state can be changed by a user,
2. The noise sensor phase amplitude adjustment circuit according to claim 1, wherein the control unit detects a housing state of the mobile phone and switches the first and second signal switching units according to a detection result. A radio using this. The noise sensor phase amplitude adjustment circuit and a radio using the same are mobile phones equipped with a plurality of radio systems,
2. The noise sensor phase according to claim 1, wherein the control unit extracts the wireless system being used from among a plurality of wireless systems, and switches the first and second switching units according to a detection result. An amplitude adjustment circuit and a radio using the same. 4. The noise sensor phase amplitude adjusting circuit according to claim 1, wherein the first phase amplitude changing means and the second phase amplitude changing means are constituted by a lumped constant circuit. Was a radio. 5. The noise sensor phase amplitude adjustment circuit according to claim 1, wherein the first phase amplitude change unit and the second phase amplitude adjustment unit include a distributed constant line, and a radio using the same. Machine. 6. The noise sensor phase amplitude adjusting circuit according to claim 1, further comprising a low noise amplifying unit between the antenna element and the second signal adding unit. Was a radio.

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