WO2006059600A1 - スイッチ回路とその制御方法及び超音波診断装置 - Google Patents
スイッチ回路とその制御方法及び超音波診断装置 Download PDFInfo
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- WO2006059600A1 WO2006059600A1 PCT/JP2005/021887 JP2005021887W WO2006059600A1 WO 2006059600 A1 WO2006059600 A1 WO 2006059600A1 JP 2005021887 W JP2005021887 W JP 2005021887W WO 2006059600 A1 WO2006059600 A1 WO 2006059600A1
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- switch circuit
- switching
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/89—Sonar systems specially adapted for specific applications for mapping or imaging
- G01S15/8906—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques
- G01S15/8909—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques using a static transducer configuration
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/18—Methods or devices for transmitting, conducting or directing sound
- G10K11/26—Sound-focusing or directing, e.g. scanning
- G10K11/34—Sound-focusing or directing, e.g. scanning using electrical steering of transducer arrays, e.g. beam steering
Definitions
- the present invention relates to a switch circuit, a control method therefor, and an ultrasonic diagnostic apparatus, and in particular, a plurality of analog signals distributed between a plurality of first terminals and a plurality of or one second terminal.
- the present invention relates to a switch circuit including the switch, a control method thereof, and an ultrasonic diagnostic apparatus using such a switch circuit.
- the ultrasonic diagnostic equipment has the function of switching the transmission of ultrasonic signals from the transmission circuit to the transducer and the function of distributing the reception of ultrasonic signals from the transducer to the reception circuit.
- a switch circuit that can control Z-blocking of signal transmission with high accuracy is desired.
- the number of ultrasonic signals and transducers is increasing, and the number of switches is increasing.
- a spike voltage generated when the switch is switched on / off may be a problem.
- the phasing circuit in the ultrasonic diagnostic apparatus refers to a signal (echo signal) that is output when each transducer provided in the probe receives an ultrasonic wave (echo) reflected and returned from within the subject. ) Are added with a suitable delay for each transducer.
- This phasing circuit is provided with a switch circuit including a number of analog switches in addition to a delay line for delaying and adding echo signals of each transducer force.
- the switch circuit has a configuration in which a plurality of first and second signal lines are arranged so as to cross each other in a mesh pattern, and analog switches are connected to all the intersections.
- the first signal line group is connected to the transducer group, and the second signal line group is connected to the tap group provided on the delay line.
- the amount of delay of the echo signal for each transducer force is controlled by turning on / off each switch in the switch circuit according to the emission direction of the ultrasonic beam. This is done by switching the taps for inputting these echo signals by setting the state.
- Patent Document 1 in a phasing circuit having a delay line, in order to avoid deterioration in image quality due to noise, it is necessary to wait until all noise generated when setting the switch circuit passes through the delay line. Transmit and receive ultrasonic beams. For this reason, the time required for all the noises to pass through the delay line is shortened by increasing the setting order of the switches connected to the transducers to be connected to the delay line having a large delay time.
- Patent Document 1 Japanese Patent Laid-Open No. 10-5129 (Overall)
- Patent Document 1 the original ultrasonic beam is transmitted / received after all the noise generated when setting a large number of switches passes through the delay line. Evil habit is inevitable.
- this switch circuit a large spike voltage is generated by simultaneous setting of multiple switches.
- the switch is used to switch the transmission of ultrasonic signals to the transducer.
- tens of thousands to hundreds of thousands of switches are required.
- An object of the present invention is to provide a switch circuit that can reduce spike noise at the time of setting the ON / OFF state of each switch.
- Another object of the present invention is to provide an ultrasonic diagnostic apparatus capable of improving the image quality of an ultrasonic image with high efficiency by eliminating a waste time waiting for noise disappearance.
- a plurality of first terminals, one or more second terminals, a plurality of switches connected between the first and second terminals, and the plurality of these terminals In the switch circuit that distributes analog signals between the first and second terminals, setting means for setting an on-Z-off state according to a scheduled schedule for each periodic setting period Splitting means for splitting the switch into a plurality of groups, and drive means for switching on / off switching of the switches between the plurality of divided groups at a timing shifted within the set period. It is characterized by.
- a switch circuit is formed on a semiconductor substrate in which elements are separated by an insulating film, and a plurality of elements connected to a signal input terminal and a signal output terminal are separated by a trench groove. To do.
- two switches connected to adjacent loads in one direction are grouped so as to be in different groups, and the switches are turned on and off between the groups.
- a switch circuit that is driven by shifting the switching timing is used as an ultrasonic signal switching means between the transducer and the transmission / reception circuit of the ultrasonic diagnostic apparatus.
- the through current from the power source at the time of switching is distributed and generated in a timing manner.
- the spike voltage is prevented from increasing due to superposition.
- the ultrasonic signal (noise) excited by the snoke voltage is reduced.
- the magnitude of the snooke voltage of the switch circuit that switches the ultrasonic signal between the transducer and the transmission / reception circuit of the ultrasonic diagnostic apparatus is suppressed to be small. This makes it possible to realize an ultrasonic diagnostic apparatus that can reduce the dead time for setting and enable efficient diagnosis.
- FIG. 1 is a configuration diagram of a switch circuit according to an embodiment of the present invention.
- FIG. 2 is a time chart of switching operation between ON and OFF of the switch in FIG.
- FIG. 3 is another time chart of the switching operation between ON and OFF of the switch in FIG.
- FIG. 4 is a configuration diagram of a switch circuit according to a second embodiment of the present invention.
- FIG. 5 is a time chart of the switching operation between ON and OFF of the switch in FIG.
- FIG. 6 is a configuration diagram of a switch circuit according to a third embodiment of the present invention.
- FIG. 7 is a time chart of switching operation between ON and OFF of the switch in FIG.
- FIG. 8 is a configuration diagram showing an embodiment of the present invention in which a semiconductor device including a switch circuit is connected.
- FIG. 9 is a time chart of an on-Z-off state switching operation of the semiconductor device in FIG.
- FIG. 10 is a cross-sectional view of a semiconductor device according to an embodiment of the present invention in which switch circuits are integrated on a semiconductor substrate.
- FIG. 11 is a configuration image diagram of another embodiment in which the switch circuit of the present invention is integrated on a semiconductor substrate.
- FIG. 12 is a sectional structural view of a part of FIG.
- FIG. 13 is an overall schematic block diagram of an embodiment according to the present invention of an ultrasonic diagnostic apparatus configured using a switch circuit.
- FIG. 14 is a diagram illustrating a specific configuration example of the probe of the ultrasonic diagnostic apparatus according to the embodiment of the present invention.
- FIG. 15 is a diagram illustrating a specific configuration example of a switch circuit similarly used in the ultrasonic diagnostic apparatus.
- FIG. 16 is a specific configuration diagram of switch circuit block # 1 in FIG.
- FIG. 17 is a time chart of the switching operation between ON and OFF of the switch in FIG.
- 10 switch circuit, 101 to 106, 111 to: L lk, 121 to 12k, 131 to 13k, lnl to: Lnk ... switch, 110 to 130, 151 to 15m ... switch circuit block, 141 to 144 ⁇
- Semiconductor devices including switch circuits, 201 to 20k, 211 to 24m ... First input / output terminal, 301 to 306 ... First signal line, 40, 401 to 40 ⁇ ⁇ Second input / output terminal, 50 ... second signal line, 60 ... probe, 601-606, 611 to 61m ... vibrator, 70 ... control circuit, 92 ... transmit circuit, 93 ... receiver circuit, 94 ⁇ Ultrasonic display circuit, 95 ⁇ Image display.
- FIG. 1 is a configuration diagram of a switch circuit according to an embodiment of the present invention.
- the switch circuit 10 includes first signal lines 301 to 306 connected to the six first input / output terminals 201 to 206 and second signal lines connected to the second input / output terminal 40. Have 50. And, it has a function of distributing one or more input analog signals to multiple or one output signal between these input / output terminals. In order to achieve this distribution function, analog switches 101 to 106 are provided at the intersections of the first signal lines 301 to 306 and the second signal line 50.
- the first input / output terminals 201 to 206 are connected to vibrators 601 to 606, which serve as loads (outputs) or signal generation sources (inputs), respectively. They are arranged side by side.
- the second input / output terminal 40 is connected with, for example, a tap having a delay line of a phasing circuit.
- the analog switches 101 to 106 in the switch circuit 10 are grouped so that the switches connected to the adjacent transducers 601-606 are in separate groups. is doing.
- switches 101 and 104 are the first group
- switches 102 and 105 are the second group
- switches 103 and 106 are the third group.
- FIG. 2 shows the operation of setting the on / off state of each of the switches 101 to 106 in the switch circuit 10. It is a time chart which shows.
- the ON / OFF state of each switch in the switch circuit 10 is set according to a schedule having a certain regularity.
- a schedule having a certain regularity As shown in FIG. 2, in the ultrasonic transmission / reception periods 1 to 3, only one switch is turned on in the order of the switches 101, 102, and 103, respectively.
- the state force of the transducer 601 is sequentially shifted to the adjacent transducers 602 and 603 by the scanning operation of the ultrasonic diagnostic apparatus.
- each switch 101-106 when switching the ON Z OFF state or updating in each setting period 1 or 2, each switch 101-106, as shown in FIG. Within 2, the timing is shifted for each group. That is, the switches 101 and 104 switch between ON and OFF or update the ON and Z OFF states at time tl and t4 in FIG. Next, switches 102 and 105 switch and update between ON and OFF at times t2 and t5. Finally, switches 103 and 106 switch and update between ON and OFF at times t3 and t6. I do. As a result, as shown by reference signs A and B in FIG. 2, adjacent switches 101 and 102 or 102 and 103 that need to be switched between on and off within the same setting period 1 or 2 have times tl and t2. Alternatively, the drive is switched at different timings such as t5 and t6.
- the switching timing of the on-Z-off state of the switches 101 to 106 is shifted, and a plurality of switching between on-Z-off that generates relatively large spike noise occurs at the same time. It is not generated and it becomes a big noise by superimposing. For this reason, for example, the image quality of the ultrasonic diagnostic apparatus is not adversely affected.
- switches 101 to 106 connected to the transducers 601 to 606 it is particularly possible to group the switches in which switching between ON and Z OFF continues into another group, particularly in the scanning operation of the ultrasonic diagnostic apparatus. This is useful in applications where the state shifts sequentially to adjacent switches.
- the switch 101 in FIG. 1 is set to ON, and the other switches 102 to 106 are set to OFF.
- Next ultrasonic transmission / reception period 2 In this case, the state of the transmission / reception period 1 is shifted, the switch 102 is turned on, and the others are turned off.
- the switch In general, the switch generates a large amount of noise when switching the state between ON and OFF, and the noise generated when the state is updated to ON force ON and OFF force OFF is small. Now, let's calculate the energy of the noise that appears at the input / output terminal 40, assuming that the energy of noise generated when switching between on and off is 1, and the energy of noise generated when updating is 0.1. Then, when all switches are switched simultaneously, the noise energy that appears at the input / output terminal 40 when setting the switch circuit 10 in the setting periods 1 and 2 is superimposed on the noise energy generated by all the switches, and the sum of them. It is 2.4.
- the noise energy appearing at the input / output terminal 40 is 1.1 at times tl, t2 and t5, t6 at most. It becomes.
- the energy of noise is 1Z2 or less when switching at the same time.
- it has setting means for setting the on-Z off state according to the scheduled schedule.
- This constitutes a switch circuit that distributes analog signals between the first and second terminals.
- a dividing means for dividing the plurality of switches 101 to 106 into three groups G1 to G3 is provided.
- a driving means for switching on and off the switch between the plurality of divided groups at the timings tl to t3 shifted in the setting periods 1 and 2.
- FIG. 3 is an operation time chart showing an example of another switch input sequence in the embodiment of FIG. 1 of the switch circuit of the present invention.
- two adjacent switches 101 and 102, 102 and 103, and 103 and 104 forces S are turned on.
- the switching timing of the on-Z-off state of the switches 101 to 106 is shifted, and as shown by the symbols C and D in FIG. There is no simultaneous switching of the number on-off state. Therefore, multiple switching between on and off, which generates relatively large spike noise, occurs at the same time and does not overlap to produce large noise. For this reason, for example, it will not adversely affect the image quality of the ultrasonic diagnostic equipment.
- the energy of noise appearing at the input / output terminal 40 during the setting periods 1 and 2 is the noise energy generated in all switches.
- the noise energy appearing at the input / output terminal 40 is 1.1 at times tl, t3, t4, and t5 at the maximum, and again when switching is performed simultaneously. Less than 1Z2.
- FIG. 4 is a configuration diagram of a switch circuit according to the second embodiment of the present invention.
- the configurations of the switch circuit 10 and the vibrators 601 to 606 are the same as those in FIG.
- the difference from Fig. 1 is that adjacent switches 101 and 102, 103 and 104, and 105 and 106 are paired as switch blocks 110 to 130, and two groups G1 and G1 are alternately arranged so that adjacent blocks are in different groups. It is to be distributed to G2.
- FIG. 5 is a time chart for explaining the switch setting operation in the embodiment of FIG. As shown in Fig. 5, as described in Fig. 3, it is suitable when two adjacent switches 101 and 102, 102 and 103, and 103 and 104 are turned on in each ultrasonic transmission / reception period 1 to 3.
- An example of grouping is shown. That is, in this switching schedule in which two adjacent switches are turned on and their states are shifted one by one, the two adjacent switches are both turned on and off within the same setting period. There is no switching. Therefore, the generation of large noises can be prevented simply by shifting the switching timing of these two groups G1 and G2.
- switches 101 and 102 or switches 103 and 104 force in the same block have the same setting period 1 or 2
- the switching timing is staggered with separate switches such as 101 and 103 as well as 102 and 104, etc., which are switched simultaneously between ON and OFF within the same setting period 1 or 2.
- the energy of noise appearing at the input / output terminal 40 is 1.3 at maximum at times tl and t3, and is approximately 1Z2 when switching is performed simultaneously.
- FIG. 6 is a configuration diagram of a switch circuit according to the third embodiment of the present invention.
- the switch circuit 10 is connected to the first input / output terminals 201 and 202, the first signal lines 301 and 302 connected thereto, and the second input / output terminals 401 and 402. Second signal lines 50 1 and 502 are provided.
- switches 111, 112, 121, and 122 are provided at intersections where the first signal lines 301 and 302 and the second signal lines 501 and 502 are arranged to intersect. These switches 111 to 122 are switched or updated between on and off by a control signal 701 from the control circuit 70.
- FIG. 7 is a time chart for explaining the setting operation of the switch circuit 10 in FIG.
- the four switches 111 to 122 are switched between the on and off states at the same time by performing two pairs arranged at the position of the mark, and the four pairs adjacent vertically and horizontally switch each other at the same timing. It is shifted.
- switches 111, 122, 112 and 121 placed at the position of the brush are switched at the same timing, and switching exemption timing is used between switches 111 and 112, 111 and 121, 121 and 122, and 112 and 122 that are adjacent vertically and horizontally. Is shifted.
- FIG. 7 is an operation time chart showing an example of the switch on sequence in the embodiment of FIG.
- one of the switches 111 and 112 is turned on one by one, and one of the switches 121 and 122 is turned on one by one.
- switches 111 and 122 are simultaneously switched or updated at time tl within setting period 1, and switches 112 and 121 are simultaneously switched or updated at time t2.
- switches 112 and 121 are simultaneously switched or updated, and at times t4, switches 111 and 122 are simultaneously switched. Replace or update.
- the noise energy generated when switching between on and off is set to 1, and the noise energy generated during the update is set to 0.1.
- the noise energy that appears at the input / output terminals when the switches are switched is the sum of the noise energy of the switches connected to the same signal line, which is 2 at the maximum.
- the switching or update timing is shifted according to this embodiment, no noise is superimposed on the input / output terminals, and the noise energy is 1 at the maximum, which is 1/2 that of switching at the same time. Become.
- FIG. 8 is a configuration diagram showing an embodiment of the present invention in which a semiconductor device including a switch circuit is connected.
- the semiconductor devices 141 to 144 including the switch circuit according to the embodiment of the present invention are connected to each other via a second signal line connected to the input / output terminals 401 to 40n. Also connected to the first signal line connected to the input / output terminals 211 to 21m, 221 to 22m,..., 241 to 24m, respectively, and the first and second signal lines intersect inside these semiconductor devices.
- the switches are provided at the intersections. By setting the on / off state of these switches, the first signal line and the second signal line are connected or disconnected.
- the semiconductor devices 141 and 143 constitute a first semiconductor device group
- the semiconductor devices 142 and 144 constitute a second semiconductor device group
- the adjacent semiconductor devices are alternately arranged in different groups. Grouped.
- FIG. 9 is a time chart for explaining switching of the on-Z off state and the updating operation of the semiconductor device in the embodiment of FIG.
- Many semiconductor switches in the semiconductor devices 141 to 144 are turned on and off in accordance with the switching timing signal sent from the control circuit 70, and the switching and updating timings of the built-in switch circuits between groups are shifted.
- the built-in switch circuits of the semiconductor devices 141 and 143 belonging to the first semiconductor device group G1 are switched or updated between on and off at time tl in FIG.
- the built-in switch circuits of the semiconductor devices 142 and 144 belonging to the second semiconductor device group G2 are switched between on / off and updated at time t2.
- the noise noise is distributed in timing among the groups, and the size of the noise appearing at the input / output terminals is reduced compared to the case where the switching operation of the built-in switch circuit of all the semiconductor devices is started simultaneously. .
- FIG. 10 is a cross-sectional view of a semiconductor device according to an embodiment of the present invention in which a switch circuit is integrated on a semiconductor substrate, and shows a cross-sectional structure corresponding to a part of the switch circuit of FIG. is there.
- the Si02 layer 850 is formed on the Si layer 849, which is the support substrate, and the n-type Si layers 851, 852, 864, and 865 formed thereon are separated by Si02 trench isolation grooves 854 to 857!
- the This is a horizontal nchM OSFET that connects 879 and 880 ⁇ gate terminals 876 and source terminals 877 together, and corresponds to switch 101 in the switch circuit of FIG.
- p layer 853 is a channel
- n + layers 860 and 861 are sources
- n layers 851 and 852 are drains
- n + layers 858 and 859 are drain contact layers
- 866 and 870 are drain electrodes
- 808 and 809 are drain terminals It is.
- Reference numerals 867 and 869 denote gate electrodes
- reference numeral 868 denotes a source electrode.
- Reference numerals 881 and 882 denote gate voltage stabilization capacitors and gate protection diodes as examples of the accompanying elements of the switches 879 and 880, respectively.
- the n + layer has the same conductivity type as the n layer and a high carrier concentration.
- the elements are separated by the insulating film Si02. Therefore, when using a large number of switches with a small parasitic capacitance, the high frequency and large amplitude regions of the input / output signals are used. It has the characteristic that there is little deterioration of characteristics in
- a force that shares the p-channel layer of the nchMOSFET constituting the switch is, of course, a trench isolation groove is provided between the n + layers 860 and 861, and the MOSFETs 879 and 880 are separated. There is no problem.
- FIG. 11 is a configuration image diagram of another embodiment in which the switch circuit of the present invention is integrated on a semiconductor substrate, and shows a planar structure of the switches 101 and 102 in the example of FIG.
- FIG. 12 further shows a partial cross-sectional structure. Each half accumulated here The conductor element is formed on the Si02 insulating film 850 in the same manner as in FIG. 10 and doubled by the adjacent elements 879, 880, 883, 884 ⁇ and Si02 ⁇ wrench separation grooves 885, 886. ⁇ . Moreover, the wiring image which connects each element is shown as the continuous line.
- the switches 101 and 102 in FIG. 11 are the switches 101 and 102 in the switch circuit 10 in FIG. 1.
- the MOSFETs 879, 880 and 883, 884 are the gate terminal 876, the source terminal 877, as in FIG. Is a lateral nch MOSFET that connects the two to each other. These perform an on-Z-off operation in accordance with control signals from the switch switching control circuits 701 and 702.
- FIG. 12 the same reference numerals as those in FIG. What is different from FIG. 10 is an nchMOSFET 898 as an example of an element in the switch switching control circuit 701 on the right side of the figure.
- the trench isolation grooves of the element connected to the input or output terminal are formed in duplicate, two parasitic capacitances generated in the trench isolation grooves by the horizontal current path are generated in series. To do. For this reason, the overall parasitic capacitance of the elements connected to the input / output terminals is reduced as compared with the case where the trench grooves are not doubled, and the characteristics of the input / output signals are degraded in the high frequency and large amplitude region. Few. This makes it possible to drive high-frequency and large-amplitude signals.
- FIG. 13 is an overall schematic configuration block diagram of an embodiment of an ultrasonic diagnostic apparatus configured using a switch circuit according to the present invention.
- the ultrasonic diagnostic apparatus includes m transducers 611 to 61 m that transmit and receive ultrasonic waves to the measurement target portion of the subject, and a transmission wave to the ultrasonic probe 60.
- the transmission circuit 92 is a transmission means for transmitting the ultrasonic signal by performing the transmission focus process.
- a reception circuit 93 including a phasing means for performing reception focus processing of the reception wave output from the ultrasonic probe 60, and an ultrasonic cross-sectional image or the like using the reception signal output from the reception circuit 93.
- An ultrasonic display circuit 94 for displaying is provided.
- the switch circuit 10 is used as a switching device for an ultrasonic signal transmitted between the probe 60, the transmission circuit 92, and the reception circuit 93.
- the switch circuit 10 includes m switch blocks 151 to 15m.
- the transmission circuit 92 and the reception circuit 93 Select one transmission / reception channel from multiple ultrasonic transmission / reception channels for m transducers that transmit / receive ultrasonic waves in the ultrasonic probe to / from the ultrasonic probe 60. Or block all transmit and receive channels.
- This ultrasonic diagnostic apparatus uses the switch circuit 10 as a switching device for an ultrasonic signal transmitted between the probe 60, the transmission circuit 92, and the reception circuit 93, so that the spike voltage at the time of switching is switched. And parasitic capacitance to the substrate can be reduced. By reducing the spike voltage, the ultrasonic signal (noise) excited by the vibrator by the spike voltage and the unnecessary ultrasonic reception signal input to the receiver circuit are reduced, and image quality that does not require wasted time for setting Can be improved. In addition, since the parasitic capacitance to the substrate is reduced, it is possible to drive high-frequency and large-amplitude ultrasonic signals. As a result, the SZN ratio of the ultrasonic signal can be improved and the image quality of the ultrasonic diagnostic apparatus can be further improved.
- this short-circuit switch is similarly driven so as to switch the on-Z-off state and the update timing. It is also possible.
- FIG. 14 is a diagram illustrating a specific configuration example of the probe 60 used in the ultrasonic diagnostic apparatus according to the embodiment of the present invention.
- (m2 X ml) transducers are arranged in a substantially two-dimensional plane. Individual oscillator numbers are shown as # 1 to # (m2 X ml). A large number of these vibrators # 1 to # (m 2 X ml) are connected to the input / output terminal group connected to the first signal line of the switch circuit 10.
- FIG. 15 is a diagram illustrating a specific configuration example of the switch circuit 10 used in the ultrasonic diagnostic apparatus according to the embodiment of the present invention.
- the first signal line terminal connected to each terminal of the (m2 X ml) oscillators in Fig. 14 is indicated by terminal # 1 to terminal # (m2 X ml).
- the switch circuit 10 is composed of (m2 X ml) Zk switch circuit blocks # 1 to # (m2 X ml) / k each having (k X n) switches.
- Switch circuit blocks connected between the first signal line terminal # 1 to terminal # (m2 X ml) and the second signal line of n channels # 1 to #n are numbered # 1 to # (m2 X ml ) Indicated by Zk.
- the # 1 to # (m2 X ml) Zk switch circuit blocks in the switch circuit 10 are k first (# 1 to #k, etc.) first signal lines connected to the vibrator side terminals, respectively. And n (# 1 to #n) second signal lines connected to the transmitting and receiving circuit side terminals. Then, both signal lines are arranged crossing each other, and switches are connected to the intersections. Therefore, one switch circuit block has (k X n) switches.
- FIG. 16 is a configuration diagram of one switch circuit block # 1 shown in FIG.
- the above-mentioned (k X n) switches 111 to: Lnk switches are arranged. Many of these switches have their on-Z-off state set periodically according to a schedule with a certain regularity, and distribute analog signals among a plurality of input / output terminals.
- a large number of switches are divided into three groups, and the timing of the on-Z off state switching operation is shifted between the groups.
- switches 11 1, l lk, 123, 131, 13 k, and 1 ⁇ 3 are the first switch gnole G1.
- switch 1 12, 121, 12k, 132, lnl, lnki or second switch gnorape G2 [this, last [this, switch 113, 122, 133, 1 ⁇ 2 is the third switch group G3, and the adjacent switch Group them so that they belong to different groups.
- FIG. 17 is a time chart for explaining the setting operation focusing on the switches 111 to 113 and 121 to 123 in the switch circuit block # 1 of FIG.
- the timing for switching the ON / OFF state of the 1st to 3rd switch groups G1 to G3 is shifted.
- the switches belonging to the first switch group G1 perform switching and updating between ON and OFF at the times tl and t4 in FIG. 17, and the switches belonging to the second switch group G2 at the times t2 and t5.
- switching between ON and OFF is performed and updating is performed
- switches belonging to the third switch group G3 perform switching and updating between ON and OFF at times t3 and t6.
- oscillator # 1 shuts down all transmit / receive channels
- oscillator # 2 transmits / receives channel # 1
- oscillator # 3 transmits / receives channel # 2
- oscillator # 4 all Changed to send / receive channel cutoff status.
- the switch 111 is turned on, the switch 112 is turned off, the switch 122 is turned on, the switch 123 is turned off, and the other switches are turned on. The same state is updated.
- the terminals 201 to 20k or The noise energy appearing at 401 to 40n is the sum of the noise energy of the switches that are connected to the same signal line and switched, and is a maximum of two.
- the energy of noise appearing at the input / output terminal is 1 at the maximum, and 1Z2 when switching is performed simultaneously.
- a group is configured with a plurality of switch circuit blocks, and the switching timing between ON and OFF of the switch is shifted for each group, thereby further increasing the spike voltage. Reduction is possible.
- a probe circuit 60 composed of a large number of transducers # 1 to # (m2 X m1) and a switch circuit in which these transducers are connected to the same number of first terminals # 1 to # (m2 X ml) 10 It has. Further, a transmission circuit 92 and a reception circuit 93 connected to a number of second terminals # 1 to #n of the switch circuit 10, and an image display connected to the reception circuit 93 via an ultrasonic display circuit 94. The target is ultrasonic diagnostic equipment equipped with 95.
- the switch circuit 10 includes a number of terminals connected between the first and second terminals.
- the switch 111 to 1 nk and the like, and setting means (control circuit) 70 for setting the on-Z-off state in accordance with a scheduled schedule for each of these multiple switches in a periodic setting period are provided.
- switching means that divides a large number of the switches into a plurality of groups, and switching between the plurality of divided groups is switched on and off at timings tl to t3 in which the switches between the plurality of groups are shifted within the setting periods 1 and 2.
- a driving means (control circuit) 70 for driving is provided.
- the ultrasonic signal (noise) excited by the vibrator by the spike voltage and the unnecessary ultrasonic reception signal input to the receiver circuit are reduced, eliminating the need for wasted time for setting. Work efficiency can be improved.
- the switch circuit according to the present embodiment for the reasons described above, the parasitic capacitance to the substrate is reduced, so that a high-frequency, large-amplitude ultrasonic signal can be driven. As a result, the SZN ratio of the ultrasonic signal can be improved and the image quality of the three-dimensional ultrasonic diagnostic apparatus can be improved.
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WO2013031168A1 (ja) * | 2011-08-31 | 2013-03-07 | パナソニック株式会社 | 超音波探触子および超音波診断装置 |
US9669427B2 (en) * | 2012-01-24 | 2017-06-06 | Texas Instruments Incorporated | Methods and systems for ultrasound control with bi-directional transistor |
JP7105172B2 (ja) | 2018-11-01 | 2022-07-22 | 富士フイルムヘルスケア株式会社 | 超音波探触子及び超音波診断装置 |
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JPS6426148A (en) * | 1987-07-22 | 1989-01-27 | Fujitsu Ltd | Ultrasonic diagnosis device |
JP2004290509A (ja) * | 2003-03-27 | 2004-10-21 | Matsushita Electric Ind Co Ltd | 超音波送波器 |
JP2004329626A (ja) * | 2003-05-08 | 2004-11-25 | Hitachi Medical Corp | 超音波診断装置 |
JP2004363997A (ja) * | 2003-06-05 | 2004-12-24 | Hitachi Medical Corp | スイッチ回路およびそれを用いた信号処理装置および超音波診断装置 |
-
2004
- 2004-11-30 JP JP2004345543A patent/JP2006149720A/ja active Pending
-
2005
- 2005-11-29 WO PCT/JP2005/021887 patent/WO2006059600A1/ja not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6426148A (en) * | 1987-07-22 | 1989-01-27 | Fujitsu Ltd | Ultrasonic diagnosis device |
JP2004290509A (ja) * | 2003-03-27 | 2004-10-21 | Matsushita Electric Ind Co Ltd | 超音波送波器 |
JP2004329626A (ja) * | 2003-05-08 | 2004-11-25 | Hitachi Medical Corp | 超音波診断装置 |
JP2004363997A (ja) * | 2003-06-05 | 2004-12-24 | Hitachi Medical Corp | スイッチ回路およびそれを用いた信号処理装置および超音波診断装置 |
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