CN105450206B - High-voltage analog switch - Google Patents
High-voltage analog switch Download PDFInfo
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- CN105450206B CN105450206B CN201510770155.8A CN201510770155A CN105450206B CN 105450206 B CN105450206 B CN 105450206B CN 201510770155 A CN201510770155 A CN 201510770155A CN 105450206 B CN105450206 B CN 105450206B
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- high voltage
- voltage analog
- output switch
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
- H03K17/6871—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors the output circuit comprising more than one controlled field-effect transistor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
- H03K17/693—Switching arrangements with several input- or output-terminals, e.g. multiplexers, distributors
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- Ultra Sonic Daignosis Equipment (AREA)
- Electronic Switches (AREA)
- Surgical Instruments (AREA)
Abstract
A high voltage analog switch is provided that may be used in an ultrasonic medical device. The high-voltage analog switch can enable the excitation signal of the high-voltage transducer to pass or block without a high-voltage power supply. The high voltage analog switch may include three output switches, one of which contains a clamp circuit to ensure that a transistor in one of the output switches at the input of the high voltage analog switch is in an off state when the high voltage analog switch is off. The high-voltage analog switch is simple in structure, does not need a high-voltage power supply to supply power, reduces the production cost and improves the safety of equipment.
Description
Correlation reference
This application claims No. 62/078,758 temporary patent application submitted in the U.S. on November 12nd, 2014 and in
The priority and right for the 14/563rd, No. 675 patent application that on December 8th, 2014 submits in the U.S., and before containing herein
State the full content of patent application.
Technical field
The embodiment of the present invention is related to high voltage analog switch, particularly, is related to opening for the simulation of ultrasonic medical equipment
It closes.
Background technology
High voltage analog switch is applied in ultrasonic medical equipment, to by emitting/receiving circuit multiplexer to selected pressure
Electric transducer.Since piezoelectric excitation signal is about ± 100V (i.e. peak-to-peak value is 200V) order of magnitude, therefore it is applied to ultrasonic medical
Analog switch in equipment allows for transferring high voltage signal.Therefore, at present applied to the high pressure simulation in ultrasonic medical equipment
It switchs relative complex, and needs one or more high-voltage suppling power.The use of high-voltage suppling power not only increases ultrasound
The cost of Medical Devices, and produce some safety problems.
Invention content
For one or more problems in the prior art, the embodiment of the present invention proposes that one kind can be used for ultrasonic medical and answers
High voltage analog switch.
High voltage analog switch according to an embodiment of the invention, can be with transferring high voltage transducer excitation signal without high pressure
Power supply.The high voltage analog switch may include three output switches, and one of output switch has clamp circuit, to ensure
When high voltage analog switch disconnects, the transistor being located in the output switch of high voltage analog switch input terminal keeps cut-off.
High voltage analog switch according to an embodiment of the invention has first port and second port.The high pressure simulation
Switch includes：First output switch, including first end and second end, wherein first end is coupled to the first of high voltage analog switch
Port, second end are coupled to the first end of the second output switch, and the first port of high voltage analog switch receives high pressure transducer and swashs
Signal is encouraged, the first output switch includes a clamp circuit, and to ensure when high voltage analog switch disconnects, the first output switch is disconnected
It opens；Second output switch, second end are coupled to the second port of high voltage analog switch, which is coupled to PZT (piezoelectric transducer)；
And third output switch, including first end and second end, wherein first end is coupled to the second end and the of the first output switch
The first end of two output switches, second end are coupled to ground.
In one embodiment, when high voltage analog switch is connected, the first output switch and the second output switch are closed, the
Three output switches disconnect, and high pressure transducer pumping signal is transmitted to second port by the first port of high voltage analog switch, works as height
When analog switch being pressed to disconnect, the first output switch and the second output switch disconnect, and third output switch is closed.
In one embodiment, the first output switch includes the first transistor and second transistor, and the two constitutes a mould
Quasi- switch and clamp circuit, including third transistor, third transistor have first end, second end and grid, first end
It is coupled to the grid of the first and second transistors, second end is coupled to the source electrode of the first and second transistors, when the first output is opened
When shutdown is opened, third transistor conducting, by the grid source short circuit of the first and second transistors.
In one embodiment, the source electrode of third transistor is coupled to the source electrode of the first and second transistors, drain electrode coupling
To the grid of the first and second transistors.
In one embodiment, clamp circuit further includes a clamp gates driving circuit, to drive third transistor
Grid, clamp gates driving circuit include a latch units.
In one embodiment, latch units include the first phase inverter and the second phase inverter, and the output of the first phase inverter is driven
Dynamic second phase inverter, the grid of output driving the first phase inverter and third transistor of the second phase inverter.
In one embodiment, the first phase inverter includes the 4th transistor and the 5th transistor, and the second phase inverter includes the
Six transistors and the 7th transistor, the source electrode of the 5th and the 7th transistor are coupled to the source electrode of the first and second transistors, and the 6th
The grid of third transistor is coupled to the drain electrode of the 7th transistor.
In one embodiment, the high voltage analog switch further includes a current source and a capacitance, current source pair
Capacitance charges, to generate an internal supply voltage with the first and second source transistors extremely reference point.
High voltage analog switch according to the ... of the embodiment of the present invention powers without high voltage power supply, simplifies circuit structure, reduce
Production cost simultaneously reduces safety problem.
Description of the drawings
Following attached drawing helps to more fully understand the next description to the embodiment of the present invention.For simplicity, different
Same or similar component or structure use identical reference numeral in attached drawing.
Fig. 1 is the schematic block diagram of ultrasonic medical equipment according to an embodiment of the invention.
Fig. 2-4 is the configuration diagram of high voltage analog switch according to an embodiment of the invention.
Fig. 5 is the framework signal that switch gate driving circuit is exported in high voltage analog switch according to an embodiment of the invention
Figure.
Fig. 6 is the configuration diagram of clamp gates driving circuit in output switch according to an embodiment of the invention.
Specific implementation mode
In detailed description of the present invention below, embodiment for a better understanding of the present invention describes a large amount of
The detail of circuit, element, method etc..It will be understood by those skilled in the art that even if lacking some details, the present invention equally may be used
To implement.To be clear illustrate the present invention, details are not described herein for some details being well known to those skilled in the art.
Fig. 1 is the block diagram of ultrasonic medical equipment 100 according to an embodiment of the invention.Ultrasonic medical equipment 100 can be
Portable, vehicle-mounted or other forms.As shown in Figure 1, ultrasonic medical equipment 100 includes multiple transmitter TX and reception
Device RX, multiple high voltage analog switches 102, multiple PZT (piezoelectric transducer)s 103.Emitter/receiver is to emitter/receiver pair 105
Including a transmitter TX and a receiver RX, wherein transmitter TX uses to transmitting transducer pumping signal, receiver RX
To receive corresponding feedback signal, which may include the echo from the object to be imaged.
Emitter/receiver pair 105 can be multiplexed by multiple high voltage analog switches 102 into multiple PZT (piezoelectric transducer)s 103
One.Such as Fig. 1 examples, high voltage analog switch 102 is configured to as transducing that amplitude is ± 90V (i.e. peak-to-peak value is 180V)
Device pumping signal provides 1-4 multiplexings.I.e. by four high voltage analog switches 102, emitter/receiver pair 105 can be connected to
One in four PZT (piezoelectric transducer)s 103.The selection of PZT (piezoelectric transducer) 103 can be corresponding with the PZT (piezoelectric transducer) 103 by being closed
The high voltage analog switch 102 of connection simultaneously disconnects the mode of its excess-three high voltage analog switch 102 to realize.Those skilled in the art
Member can change specific set of multiplexing ratio and transducer excitation signal it should be understood that merely illustrative explanation herein, and
Without departing from the spirit and scope of the present invention.Each high voltage analog switch 102 can have first port for being coupled to hair
Emitter/receiver pair 105 and second port are for being coupled to PZT (piezoelectric transducer) 103.
As shown in Figure 1, ultrasonic medical equipment 100 includes logic control and signal processing circuit 101, the circuit is by energy converter
Pumping signal is sent to PZT (piezoelectric transducer) 103.The transducer excitation signal of transmitter TX transmittings is transmitted to high voltage analog switch 102,
When high voltage analog switch 102 is connected, transducer excitation signal reaches and encourages PZT (piezoelectric transducer) 103.High tension protection circuit 104
Protect corresponding receiver RX from the damage of high pressure transducer pumping signal.After excitation, PZT (piezoelectric transducer) 103 is to being imaged
Object emission ultrasonic wave.The reflection signal that the object to be imaged generates is received by PZT (piezoelectric transducer) 103, passes through high voltage analog switch
It is sent after 102 to receiver RX.The reflection signal received is considerably faint, about only has the magnitude of ± 100uV to ± 100mV.
Logic control receives and processes reflection signal with signal processing circuit 101, to build the image of the object to be imaged.
Fig. 2 is the configuration diagram of high voltage analog switch 102 according to an embodiment of the invention.It is appreciated that in ultrasound
There are multiple high voltage analog switches 102 in Medical Devices 100, but in order to illustrate being more clear, is only drawn in Fig. 2 and subsequent drawings
One of them.High voltage analog switch 102 includes first port SWin and second port SWout.Ultrasonic medical as shown in Figure 1 is set
Application in standby 100, first port SWin are connected with emitter/receiver pair 105, second port SWout and PZT (piezoelectric transducer)
103 are connected.
Fig. 3 is 102 further details of high voltage analog switch according to an embodiment of the invention.In example shown in Fig. 3,
High voltage analog switch 102 includes the ports SWin, the ports SWout and ground port RGnd.In figure 3, bleeder resistance R1 connections SWout
Port and ground port RGnd；One end of PZT (piezoelectric transducer) (PZT) is coupled to the ports SWout, and the other end is coupled to ground port RGnd.
From Fig. 3 it can also be seen that the ports SWin are coupled to the output of transmitter TX and receiver RX in emitter/receiver pair 105
Input.High tension protection circuit 104 makes the input of receiver RX and the high pressure transducer pumping signal of the ports SWin be isolated.
In ultrasonic medical application, the main function of high voltage analog switch 102 is by transmitter TX and receiver RX multiplexings
To selected PZT (piezoelectric transducer) 103.Transducer excitation signal from transmitter TX can be that frequency is 1.0MHz to 15MHz,
Amplitude is about the high-voltage pulse signal of ± 100V magnitudes.Therefore, high voltage analog switch 102 is required to transmit or block high pressure
Signal, in ultrasonic medical application, which is at least ± 40V (i.e. peak-to-peak value is at least 80V).
In Fig. 3, high voltage analog switch 102 includes that three outputs switch, and is respectively designated as SWA, SWB and SWC.When high pressing mold
When quasi- switch 102 is connected, output switch SWA and SWC are closed, and output switch SWB is disconnected.Include the transducer excitation of high-voltage pulse
Signal encourages PZT (piezoelectric transducer) 103 by exporting switch SWA and SWC.
When high voltage analog switch 102 turns off, output switch SWA and SWC are disconnected, and output switch SWB is closed.Due to output
Switch SWA is disconnected, and high-voltage pulse can not pass through.Since there are parasitic capacitances between the both ends of output switch SWA, this makes
AC (exchange) electric current can be by exporting switch SWA.The output switch SWB of closure by the AC current distributings of above-mentioned feedthrough to ground.
The conducting resistance of output switch SWB will be multiplied with alternating current to generate a relatively small alternating voltage at the both ends SWB.Although
The amplitude of the alternating voltage is relatively small, but is enough to encourage PZT (piezoelectric transducer) 103.To prevent the generation of above-mentioned phenomenon, output from opening
SWC is closed to disconnect to prevent above-mentioned AC voltages transmission to PZT (piezoelectric transducer) 103.
Fig. 4 is 102 further details of high voltage analog switch according to an embodiment of the invention.In Fig. 4, high pressure simulation
Switch 102 includes output switch SWA (being denoted as 402), SWB (being denoted as 403) and SWC (being denoted as 404).High voltage analog switch 102 is also
Gate driving including exporting switch SWA, SWB and SWC, is denoted as 405-407 respectively.Export switch gate driving circuit 405-
407, other components of clamp gates driving 401 and high voltage analog switch 102 can be by logic control and signal processing electricity
The control of road 101 or other control circuits.
In one embodiment, output switch SWA, SWB and SWC is identical, in addition to SWA also includes additionally clamp circuit,
The clamp circuit includes that transistor M3A and the clamp gates for driving transistor M3A drive 401.In addition, output switch SWC
In transistor can not have to be high-voltage tube.
In the example shown in fig. 4, the transistor M1A and M2A in output switch SWA are high pressure N-channel metal oxides half
Conductor field-effect transistor (MOSFETs), i.e. NMOS tube, two NMOS tubes constitute an analog switch.In Fig. 4, the source electrode of M1A
It is coupled to the source electrode of M2A, M1A is connected with the grid of M2A.The anode of voltage-stabiliser tube D1A is coupled to the source electrode of M1A and M2A, voltage-stabiliser tube
The anode of D2A is coupled to the grid of M1A and M2A.D1A is connected with the cathode of D2A.Voltage-stabiliser tube D1A and D2A limit high pressure, to protect
Protect the gate-source oxide of M1A and M2A.The output of gate driving 405 is coupled to the grid of M1A and M2A, to be closed or disconnect
Export switch SWA.Output switch SWB and SWC can be made of identical element, and be worked in the same way.
In the example described in Fig. 4, the ports SWin are coupled to the drain electrode of M1A, and the drain electrode of M2A is coupled in output switch SWC
The drain electrode of transistor M1C.The drain electrode of transistor M2C is coupled to the ports SWout in SWC.It exports in switch SWB, transistor M1B's
Drain electrode is coupled to the drain electrode of M2A and M1C.The grounded drain of M2B.
When high voltage analog switch 102 is connected, transistor M1A and M2A is led under the driving of output switch gate driving 405
Logical, M1C and M2C are connected under the driving of output switch gate driving 407, and M1B and M2B are in output switch gate driving 406
The lower cut-off of driving.When high voltage analog switch 102 turns off, drivings of the transistor M1A and M2A in output switch gate driving 405
Lower cut-off, M1C and M2C end under the driving of output switch gate driving 407, and M1B and M2B are in output switch gate driving
It is connected under 406 driving.
In the example described in Fig. 4, output switch SWA further includes transistor M3A, the gate-source electricity of M3A connection M1A and M2A
Pressure.More particularly, the source electrode of M3A is coupled to the source electrode of M1A and M2A, and the drain electrode of M3A is coupled to the grid of M1A and M2A.When defeated
When going out switch SWA disconnections, M3A is connected under the driving of clamp gates driving 401, by the grid source short circuit of M1A and M2A, such as will
The grid and source voltage of M1A and M2A shift to 0V, to ensure that M1A and M2A keeps cut-off.I.e. when high voltage analog switch 102 turns off,
M3A makes output switch SWA remain open.
Fig. 5 be exported in high voltage analog switch 102 according to an embodiment of the invention switch gate driving circuit (such as
405,406 and configuration diagram 407).Fig. 5 illustrates the output switch gate driving circuit 405 of driving output switch SWA
Further details, the same switch gate driving circuit that exports can be used for driving output switch SWB and SWC.In a reality
It applies in example, SWA, SWB are identical with the output switch gate driving circuit of SWC.Therefore, to make elaboration be more clear, in Figure 5,
The output switch gate driving circuit 406 and 407 of SWB and SWC is omitted.
In example described in Fig. 5, output switch gate driving circuit 405 includes PMOS tube M4A, NMOS tube M5A, diode
D3A and D4A and current source I1A and I2A.The source electrode of M4A and M5A is respectively coupled to current source I1A and I2A.The drain electrode of M4A
It is coupled to the anode of diode D3A, the drain electrode of M5A is coupled to the cathode of diode D4A.The anode of D4A is coupled to the moon of D3A
Pole, and drive output switch SWA, the i.e. grid of M1A and M2A as output end.
For ultrasonic medical application, section is closed by being conducting to or by pass section to conducting in the state of high voltage analog switch 102
Before transformation, the voltage of two ports SWin and SWout is 0V.To be closed output switch SWA, M4A conducting by the grid of M1A and M2A
Pole charges to the voltage value that Vdd subtracts diode drop on D3A.The supply voltage Vdd for being coupled to current source I1A can be+10V
Deng.Charging current is limited by current source I1A, and value can be near 2mA.Export voltage-stabiliser tube D1A and D2A in switch SWA
Breakdown voltage is more than supply voltage Vdd, therefore no electric current flows through D1A and D2A, and this avoids the risks for introducing current noise.One
When the gate capacitance of denier M1A and M2A are charged to close to supply voltage Vdd, there would not be electric current to flow through again.In the ports SWin, when next
When the transducer excitation signal of spontaneous emitter TX rises to+100V by 0V, the source voltage of M1A and M2A will also rise to+
100V.The grid voltage of M1A and M2A will rise to+100V and subtract a small pressure drop on diode D3A plus Vdd.At this moment,
D3A reverse bias.
The gate-source capacitance of M1A and M2A maintains gate charges voltage so that M1A and M2A are held on.In 500ns or shorter
After time, transducer excitation signal will drop to -100V by+100V.The source voltage of M1A and M2A also will settle to -100V.
The grid voltage of M1A and M2A will settle to -100V and subtract a small pressure drop on diode D3A plus Vdd.At this moment, D3A is being just
To biasing.The electric current set by current source I1A flow to -100V after transistor M4A, diode D3A, voltage-stabiliser tube D2A and D1A.
M1A is limited with the gate source voltage Vgs of M2A by the voltage-stabiliser tube D1A and D2A being connected back-to-back.After another 500ns, change
It can device pumping signal zero.
Switch SWA is exported to disconnect, transistor M5A conductings, by the gate discharge of M1A and M2A to 0V plus on D4A
Diode drop.Discharge current is limited by current source I2A, and value can be near 2mA.Once the gate capacitance of M1A and M2A is put
When electricity is to close to 0V, there would not be electric current to flow through again.In the ports SWin, when transducer excitation signal rises to+100V by 0V,
The source voltage of M1A and M2A will be remained within close to 0V.The grid voltage of M1A and M2A will also be protected close to 0V, M1A and M2A
Hold cut-off.At this point, transistor M3A conductings, by the grid source short circuit of M1A and M2A, to ensure that they end.When transducer excitation is believed
When number dropping to -100V, due to the effect of M1A body diodes, the source voltage of M1A and M2A will settle to -100V and adds one
Diode drop.Because M3A is connected at this time, the grid voltage of M1A and M2A are also that -100V adds a diode drop.This
When, diode D4A reverse bias；There is no electric current to flow through, M1A and M2A keep cut-off.
Fig. 6 is the clamp gates to driving transistor M3A in high voltage analog switch 102 according to an embodiment of the invention
The schematic diagram of driving 401.Output switch SWA (see 402) and its circuit of output switch gate driving 405 is also shown in Fig. 6.
In example shown in Fig. 6, current source I30A, diode D30A, voltage-stabiliser tube D31A, D32A and capacitance C30A are generated
One using the source electrode of M1A and M2A as the internal supply voltage Vint of reference point.In the source electrode of transistor M30A and M32A are coupled to
The source electrode of portion supply voltage Vint, M31A and M33A are coupled to the source electrode of M1A and M2A.The drain electrode of M30A and M31A is coupled to
The grid of M32A and M33A.The drain electrode of M32A and M33A is coupled to the grid of M3A.Current source I30A is by diode D30A to electricity
Hold C30A to charge, electric current flows through the source electrode of M1A and M2A, then flows into ground by the body diode of M1A or M2A.Voltage-stabiliser tube
D31A and D32A limits the maximum charging voltage of capacitance C30A.Internal supply voltage Vint to give by transistor M30A,
CMOS (complementary metal oxide semiconductor) latch power supply that M31A, M32A and M33A are constituted.Transistor M30A and M31A quilt
It is configured to the first CMOS inverter.M32A and M33A is configured as the second CMOS inverter.The output of first CMOS inverter is (i.e.
The drain electrode of M30A and M31A) as the second CMOS inverter input (i.e. the grid of M32A and M33A) driving.2nd CMOS is anti-
The output (i.e. the drain electrode of M32A and M33A) of phase device inputs the drive of (i.e. the grid of M30A and M31A) as the first CMOS inverter
It is dynamic.Foregoing circuit, which can drive, itself reaches a stable logic state, constitutes a latch units.
Control to latch units may be implemented by being turned on and off transistor M34A and M35A.When M35A is connected,
M34A is turned off.M35A is by diode D34A, under the electric current that current source I32A is limited, by the grid of transistor M32A and M33A
It is pulled down to ground.This sets the grid of transistor M32A and M33A to logic low state.The drain electrode of M32A and M33A will be logic
The grid of high state, M30A, M31A, M36A and M3A obtains high level driving.M3A is connected, by the grid source short circuit of M1A and M2A,
Them are made to be held off.Switch SWA is exported therefore to disconnect.The drain electrode of transistor M30A and M31A will be logic low, so that M32A
Grid with M33A is logic low.
When transistor M34A is opened, transistor M35A shutdowns.M34A is limited by diode D33A in current source I31A
Electric current under, the grid of transistor M30A and M31A are pulled down to ground.The grid of transistor M30A and M31A are set as patrolling by this
Collect low state.The drain electrode of M30A and M31A will be logic high state, the grid acquisition high level driving of M32A and M33A.Transistor
The drain electrode of M32A and M33A will be logic low.Transistor M36A and M3A shutdown, allows output switch gate driving circuit 405 to close
Close output switch SWA.
According to the explanation of front, high voltage analog switch in the present invention can with transferring high voltage transducer excitation signal without
High-voltage suppling power.For example, other supply voltages of supply voltage Vdd and analog switch can be ± 10V, it is even lower.
While disclosing this high voltage analog switch, some embodiments of the present invention are described in detail, it will be understood that these
The explanation of being given for example only property of embodiment, is not intended to limit the scope of the present invention.Other feasible selective embodiments can be with
Understood by those skilled in the art.
Claims (17)
1. a kind of high voltage analog switch, with first port and second port, the high voltage analog switch includes：
First output switch, including first end and second end, first end are coupled to the first port of high voltage analog switch, and second
End is coupled to the first end of the second output switch, and the first port of high voltage analog switch receives high pressure transducer pumping signal, the
One output switch includes clamp circuit, and to ensure when high voltage analog switch disconnects, the first output switch disconnects；
Second output switch, second end are coupled to the second port of high voltage analog switch, which is coupled to piezoelectricity and changes
It can device；And
Third output switch, including first end and second end, first end are coupled to the second end and second of the first output switch
The first end of switch is exported, the second end of third output switch is coupled to ground；Wherein
When high voltage analog switch is connected, the first output switch and the second output switch are closed, and third output switch disconnects, will
High pressure transducer pumping signal is transmitted to second port by the first port of high voltage analog switch, when high voltage analog switch disconnects
When, the first output switch and the second output switch disconnect, and third output switch is closed；
It is characterized in that, the first output switch includes the first transistor and second transistor to form analog switch, and
Clamp circuit, including third transistor, the third transistor have first end, second end and grid, first end coupling
To the grid of the first transistor and second transistor, second end is coupled to the source electrode of the first transistor and second transistor, when
When first output switch disconnects, third transistor conducting, by the grid and source shorted of the first transistor and second transistor.
2. high voltage analog switch as described in claim 1, which is characterized in that the source electrode of third transistor is coupled to first crystal
The source electrode of pipe and second transistor, the drain electrode of third transistor are coupled to the grid of the first transistor and second transistor.
3. high voltage analog switch as described in claim 1, which is characterized in that clamp circuit further includes clamp gates driving electricity
Road includes latch units to drive the grid of third transistor, clamp gates driving circuit.
4. high voltage analog switch as claimed in claim 3, which is characterized in that the latch units include the first phase inverter and the
Two phase inverters, the second phase inverter of output driving of the first phase inverter, the first phase inverter of output driving and third of the second phase inverter
The grid of transistor.
5. high voltage analog switch as claimed in claim 4, which is characterized in that the first phase inverter includes the 4th transistor and the 5th
Transistor, the second phase inverter include the 6th transistor and the 7th transistor, the source electrode coupling of the 5th transistor and the 7th transistor
To the source electrode of the first transistor and second transistor, the drain electrode of the 6th transistor and the 7th transistor is coupled to third transistor
Grid.
6. high voltage analog switch as claimed in claim 5 further includes current source and capacitance, which is characterized in that the current source pair
The capacitance charges, and to generate internal supply voltage, the internal supply voltage is with the source of the first transistor and second transistor
Extremely reference point.
7. a kind of ultrasonic medical equipment includes：
High voltage analog switch, it includes that the first output switchs, is second defeated to have first port and second port, the high voltage analog switch
Go out switch and third output switch, wherein the first end of the first output switch is coupled to the first port of high voltage analog switch, the
The second end of two output switches is coupled to the second port of high voltage analog switch, and the first end of third output switch is coupled to first
The first end of the second end and the second output switch of switch is exported, the second end of third output switch is coupled to ground, the high pressing mold
Quasi- switch further includes clamp circuit, which makes the first output switch be remained open when high voltage analog switch disconnects；
Emitter/receiver pair is coupled to the first port of high voltage analog switch；And
PZT (piezoelectric transducer) is coupled to the second port of high voltage analog switch, when high voltage analog switch is connected, to receive by emitting
The high pressure transducer pumping signal that the transmitter of device/receiver centering emits, transmitted through high voltage analog switch；
Wherein, when high voltage analog switch is connected, the first output switch and the second output switch are closed, and third output switch is disconnected
It opens, high pressure transducer pumping signal is transmitted to second port by the first port of high voltage analog switch, conversely, when high pressure simulation is opened
When shutdown is opened, the first output switch and the second output switch disconnect, and third output switch is closed；
It is characterized in that, clamp circuit includes third transistor, third transistor has first end, second end and grid, wherein
The first end of third transistor is coupled to the grid of the first transistor and second transistor, and the second end of third transistor is coupled to
The source electrode of the first transistor and second transistor, when the first output switch disconnects, third transistor conducting, by the first transistor
With the grid source short circuit of second transistor.
8. ultrasonic medical equipment as claimed in claim 7, which is characterized in that the power supply of high voltage analog switch without require more than ±
10V。
9. ultrasonic medical equipment as claimed in claim 7, which is characterized in that the peak-to-peak value of high pressure transducer pumping signal is extremely
It is 80V less.
10. ultrasonic medical equipment as claimed in claim 7, which is characterized in that the first output switch include the first transistor with
Second transistor.
11. ultrasonic medical equipment as claimed in claim 10, which is characterized in that the source electrode of third transistor is coupled to the first crystalline substance
The source electrode of body pipe and second transistor, the drain electrode of third transistor are coupled to the grid of the first transistor and second transistor.
12. ultrasonic medical equipment as claimed in claim 10, which is characterized in that clamp circuit further includes clamp gates driving electricity
Road includes a latch units to drive the grid of third transistor, clamp gates driving circuit.
13. ultrasonic medical equipment as claimed in claim 12, which is characterized in that latch units include the first phase inverter and second
Phase inverter, the input of the first phase inverter exported as the second phase inverter, the output of the second phase inverter is as the first phase inverter
Input, and drive the grid of third transistor.
14. high voltage analog switch includes：
First output switch, first end are coupled to emitter/receiver pair, and the first output switch includes the first transistor and the
For two-transistor to constitute the first analog switch, the first output switch further includes clamp circuit, when high voltage analog switch disconnects, pincers
Position circuit makes the first transistor and second transistor keep cut-off；
Second output switch, first end are coupled to the second end of the first output switch, and second end is coupled to PZT (piezoelectric transducer),
Second output switch includes the 4th transistor and the 5th transistor to constitute the second analog switch；And
Third output switch, first end are coupled to the first end of the second end and the second output switch of the first output switch, the
The second end of three output switches is coupled to ground, and third output switch includes the 6th transistor and the 7th transistor to constitute third mould
Quasi- switch,
Wherein, when high voltage analog switch is connected, the first output switch and the second output switch are closed, and third output switch is disconnected
It opens, the high pressure transducer pumping signal that the transmitter of emitter/receiver centering is emitted is transmitted to PZT (piezoelectric transducer), instead
It, when high voltage analog switch disconnects, the first output switch and the second output switch disconnect, and third output switch is closed；
It is characterized in that, clamp circuit includes third transistor, third transistor has first end, second end and grid, wherein
The first end of third transistor is coupled to the grid of the first transistor and second transistor, and the second end of third transistor is coupled to
The source electrode of the first transistor and second transistor, when the first output switch disconnects, third transistor conducting, by the first transistor
With the grid source short circuit of second transistor.
15. high voltage analog switch as claimed in claim 14, which is characterized in that the source electrode of third transistor is coupled to the first crystalline substance
The source electrode of body pipe and second transistor, the drain electrode of third transistor are coupled to the grid of the first transistor and second transistor.
16. high voltage analog switch as claimed in claim 14, which is characterized in that the power supply of high voltage analog switch without require more than ±
10V。
17. high voltage analog switch as claimed in claim 14, which is characterized in that the peak-to-peak value of high pressure transducer pumping signal
At least 80V.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201462078758P | 2014-11-12 | 2014-11-12 | |
| US62/078,758 | 2014-11-12 | ||
| US14/563,675 US9401659B2 (en) | 2014-11-12 | 2014-12-08 | High voltage analog switch |
| US14/563,675 | 2014-12-08 |
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| Publication Number | Publication Date |
|---|---|
| CN105450206A CN105450206A (en) | 2016-03-30 |
| CN105450206B true CN105450206B (en) | 2018-08-03 |
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|---|---|---|---|
| CN201510770155.8A Active CN105450206B (en) | 2014-11-12 | 2015-11-12 | High-voltage analog switch |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1459145A (en) * | 2001-03-20 | 2003-11-26 | 皇家菲利浦电子有限公司 | Circuit and method for controlling dynamic, bi-directional high voltage analog switch and ultrasound examination apparatus equipped with such a circuit |
| CN103298569A (en) * | 2010-12-09 | 2013-09-11 | 意法半导体股份有限公司 | Switching circuit for a transmission channel for ultrasound applications, transmission channel and process for driving a switching circuit |
| CN103812523A (en) * | 2012-11-08 | 2014-05-21 | 财团法人工业技术研究院 | Switching circuit, radio frequency switching circuit and switching method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050228284A1 (en) * | 2004-03-31 | 2005-10-13 | Charles Edward Baumgartner | System and method for power management in an ultrasound system |
| US8212604B2 (en) * | 2009-08-07 | 2012-07-03 | Stmicroelectronics Asia Pacific Pte. Ltd. | T switch with high off state isolation |
| US7924108B2 (en) * | 2009-08-14 | 2011-04-12 | Freescale Semiconductor, Inc. | Oscillator amplifier with input clock detection and method therefor |
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2015
- 2015-11-12 CN CN201510770155.8A patent/CN105450206B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1459145A (en) * | 2001-03-20 | 2003-11-26 | 皇家菲利浦电子有限公司 | Circuit and method for controlling dynamic, bi-directional high voltage analog switch and ultrasound examination apparatus equipped with such a circuit |
| CN103298569A (en) * | 2010-12-09 | 2013-09-11 | 意法半导体股份有限公司 | Switching circuit for a transmission channel for ultrasound applications, transmission channel and process for driving a switching circuit |
| CN103812523A (en) * | 2012-11-08 | 2014-05-21 | 财团法人工业技术研究院 | Switching circuit, radio frequency switching circuit and switching method thereof |
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| CN105450206A (en) | 2016-03-30 |
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