CN205880029U - Trigger interconnected circuit and oscilloscope - Google Patents
Trigger interconnected circuit and oscilloscope Download PDFInfo
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- CN205880029U CN205880029U CN201620587104.1U CN201620587104U CN205880029U CN 205880029 U CN205880029 U CN 205880029U CN 201620587104 U CN201620587104 U CN 201620587104U CN 205880029 U CN205880029 U CN 205880029U
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- pole double
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Abstract
The utility model provides a trigger interconnected circuit and oscilloscope, includes: switch SW4, switch SW4 is single -pole double -throw, resistance rlfrj, electric capacity clfrj. Work as SW1, SW2 switches to rdc simultaneously, when SW4 switches to output terminal, realizes DC coupling function, switch to rac end as SW1, SW2 switches the end to cac, and SW4 switches when exporting, realizes AC coupling function, switch when holding to rlfrj as SW4, realize the low frequency reject function.
Description
Technical field
The present invention relates to a kind of triggering and couple circuit, be specifically related to a kind of triggering coupling circuit and oscillograph.
Background technology
Trigger Function is a peculiar function of digital storage oscilloscope, and the digital signal that ADC is collected by oscillograph is deposited
Store up in memorizer, adjust the horizontal level of every frame waveform with triggering signal, thus on screen, get stable waveform.
Oscillographic triggering system generally comprises three parts: trigger port, and its major function is that the signal to input carries out impedance
Join, decay and impedance transformation；Triggering coupling circuit, its major function is to sieve the triggering signal after amplitude is nursed one's health
Choosing, using low pass or high pass filter to obtain user needs the triggering signal of frequency range, is generally divided into DC, AC, low frequency suppression, height
Frequency four kinds of patterns of suppression；Comparison circuit, its major function is to use high-speed comparator to produce digital trigger signal.
Along with the development in epoch, oscillographic analog bandwidth is also ceaselessly increasing, for Trigger Function requirement the most more
The variation added.Low frequency Restrain measurement in available circuit can not meet demand, and it main reason is that cutting of its low frequency
Only frequency is limited by circuit structure, at most can only get at tens KHz.When circuit switches to low frequency suppression, electric capacity C becomes
For affecting the principal element of low-frequency cut-off frequency, as it is shown in figure 1, by Spice software emulation, it can be seen that along with electric capacity C's
Value is for reducing, and the low-frequency cut-off frequency of system is increasing, and when C is reduced to 15pF ,-3dB the cut-off frequency of circuit is 20KHz.
Reduce the value of electric capacity C the most again, DC coupling and the function of AC coupling can be badly influenced, need to take a substantial amount of time to DC and
AC coupling circuit redesigns.
Summary of the invention
The application provides the suppression of a kind of oscillographic low frequency to trigger coupling circuit and implementation method, and it is mainly used in numeral
The simulation triggering of memory oscilloscope and external trigger circuit.Existing triggering circuit be cut into low frequency suppression time, its low frequency cut
Only frequency only up to tens KHz, and be difficult to regulate its cut-off frequency by the parameter of regulation circuit.This technology is permissible
Low-frequency cut-off frequency when being suppressed by low frequency brings up to 500KHz, and can realize cut-off by the adjustment of simple circuit parameter
The adjustment of frequency, simple and practical.
According to the first aspect of the application, the application provides a kind of and triggers coupling circuit, including single-pole double-throw switch (SPDT) SW1,
SW2, SW4, resistance Rdc, Rac, Rlfrj, electric capacity C, Cac, Clfrj, three end pipe Q and operational amplifier U:
Operational amplifier U is follower connected mode, and one input end is connected with the moved end of single-pole double-throw switch (SPDT) SW2, and it is another
One input is connected with the moved end of single-pole double-throw switch (SPDT) SW4, and the control end of its outfan and one or three end pipe Q is connected；Single-pole double throw
First contact of not moved end of switch SW2 is connected with one end of resistance Rdc, the other end of resistance Rdc and single-pole double-throw switch (SPDT) SW1
Not moved end the first contact be connected；Second contact of the not moved end of single-pole double-throw switch (SPDT) SW2 is with single-pole double-throw switch (SPDT) SW1's
Do not connect between the second contact of moved end and have the resistance Rac and electric capacity Cac of series connection；The of the not moved end of single-pole double-throw switch (SPDT) SW2
Two contacts are also associated with a direct voltage source；The moved end of single-pole double-throw switch (SPDT) SW1 is connected to first end of electric capacity C, the of electric capacity C
Two ends are connected to the outfan of operational amplifier U；The moved end of single-pole double-throw switch (SPDT) SW1 is connected to trigger the input of coupling circuit
End, is used for receiving input signal；First pole of described three end pipe Q is connected with working voltage source, the second pole ground connection；Single-pole double-throw switch (SPDT)
It is connected between first contact of the not moved end of SW4 with the outfan triggering coupling circuit and has the resistance R of series connectionlfrjWith electric capacity Clfrj；
Second contact of the not moved end of single-pole double-throw switch (SPDT) SW4 is connected to trigger the outfan of coupling circuit.
In a preferred embodiment, the voltage of described direct voltage source is 1.25V.
In a preferred embodiment, between outfan and second end of electric capacity C of described operational amplifier U, it is also associated with an electricity
Resistance R1.
In a preferred embodiment, between control pole and second end of electric capacity C of described three end pipe Q, it is also associated with a resistance
R2。
In a preferred embodiment, the moved end of single-pole double-throw switch (SPDT) SW1 also connects between the input coupling circuit with triggering
It is connected to a resistance R.
In a preferred embodiment, described three end pipes are audion.
In a preferred embodiment, a current source ground connection is passed through in the second pole of described three end pipes.
According to the second aspect of the application, the application also provides for a kind of oscillograph, and it includes above-mentioned triggering coupling circuit.
Circuit and oscillograph is coupled, owing to including SW4, resistance R according to the triggering of above-described embodimentlfrjWith electric capacity ClfrjSo that
On the one hand allow to the cut-off frequency of low frequency is arranged 500KHz, the even arbitrary frequency in bandwidth；On the other hand,
DC coupling and AC coupling circuit can be impacted, when during debugging, consuming designer is substantial amounts of during prior art regulation electric capacity C
Between, the application only need to regulate Rlfrj and Clfrj can obtain the cut-off frequency wanting to set, and does not interferes with other
Coupled modes normally work.
Accompanying drawing explanation
Fig. 1 is the Spice analogous diagram of low-frequency cut-off frequency；
Fig. 2 is the circuit diagram of prior art；
Fig. 3 is the structural representation triggering coupling circuit in the application one embodiment；
Fig. 4 is resistance, electric capacity and the circuit of high pass filter figure of output loading composition.
Detailed description of the invention
Combine accompanying drawing below by detailed description of the invention the present invention is described in further detail.
Fig. 2 shows the circuit diagram of prior art.The existing realization triggering coupling circuit is based on three hilted broadswords
Commutator, realizes the function switching of DC, AC, low frequency suppression by the switching of switch.It is specifically described below.
DC couples:
As in figure 2 it is shown, work as SW1, when SW2 switches to resistance Rdc simultaneously, direct current and the AC compounent of input signal are the most defeated
Entering the input to amplifier U, the connected mode of amplifier U is follower mode, its unity gain bandwidth typically at tens KHz to several
Between hundred KHz；The high fdrequency component of input signal is directly superimposed to the input of J1 by electric capacity C.Two kinds of signals are by J1 superposition
Its direct current rear and AC compounent are not the most lost, and this coupled modes are exactly DC coupling.
AC couples:
When SW1 is switched to Rac end, and SW2 is switched to SW3 end, when SW3 switches to capacitance terminal, the now direct current of input signal
Partly because the effect of capacitance C and Cac and outfan cannot be delivered to, this coupled modes be AC coupling.Direct current is believed
Number and the relatively low AC signal of frequency be filtered out because the value of Cac is generally higher than 1uF, and the capacitance of C is generally less than 1nf, because of
Low-frequency cut-off frequency during this AC coupling is determined by electric capacity Cac, generally 10Hz.
Low frequency suppresses:
Switching to SW3 when SW1 is switched to Rac, SW2, when SW3 switches to unsettled, input signal can only be transmitted by electric capacity C
To outfan, now direct current and the low-frequency ac signal of input signal is filtered out, here it is low frequency suppression, because the value of electric capacity C
By circuit simulation, generally hundreds of pf, can be seen that its low-frequency cut-off frequency is less than 10KHz.
Fig. 3 shows the circuit diagram triggering coupling circuit of technical solution of the present invention.The technical scheme is that former
By increasing a switch SW4 and resistance R newly at outfan on the basis of technologylfrjElectric capacity ClfrjNetwork, low frequency is suppressed function and
AC coupling circuit separates, and so has only to regulate resistance RlfrjWith electric capacity ClfrjJust the cut-off frequency that low frequency suppresses can be arranged
To about 500KHz.
The triggering coupling circuit of the application includes single-pole double-throw switch (SPDT) SW1, SW2, SW4, resistance Rdc, Rac, Rlfrj, electric capacity
C、Cac、Clfrj, three end pipe Q and operational amplifier U, it is specifically described below.
Operational amplifier U is follower connected mode, and one input end is connected with the moved end of single-pole double-throw switch (SPDT) SW2, and it is another
One input is connected with the moved end of single-pole double-throw switch (SPDT) SW4, and the control end of its outfan and one or three end pipe Q is connected；Single-pole double throw
First contact of not moved end of switch SW2 is connected with one end of resistance Rdc, the other end of resistance Rdc and single-pole double-throw switch (SPDT) SW1
Not moved end the first contact be connected；Second contact of the not moved end of single-pole double-throw switch (SPDT) SW2 is with single-pole double-throw switch (SPDT) SW1 not
Connect between second contact of moved end and have the resistance Rac and electric capacity Cac of series connection；The second of the not moved end of single-pole double-throw switch (SPDT) SW2
Contact is also associated with a direct voltage source, and in a preferred embodiment, the voltage of direct voltage source is 1.25V；Single-pole double throw is opened
The moved end closing SW1 is connected to first end of electric capacity C, and second end of electric capacity C is connected to the outfan of operational amplifier U；Hilted broadsword is double
The moved end of throw switch SW1 is connected to trigger the input of coupling circuit, is used for receiving input signal；The first of described three end pipe Q
Pole is connected with working voltage source, the second pole ground connection；First contact of the not moved end of single-pole double-throw switch (SPDT) SW4 couples circuit with triggering
Connect between outfan and have the resistance R of series connectionlfrjWith electric capacity Clfrj；Second contact of the not moved end of single-pole double-throw switch (SPDT) SW4 connects
To the outfan triggering coupling circuit.
In a preferred embodiment, between outfan and second end of electric capacity C of described operational amplifier U, it is also associated with an electricity
Resistance R1.
In a preferred embodiment, between control pole and second end of electric capacity C of described three end pipe Q, it is also associated with a resistance
R2。
In a preferred embodiment, the moved end of single-pole double-throw switch (SPDT) SW1 also connects between the input coupling circuit with triggering
It is connected to a resistance R.
In a preferred embodiment, described three end pipes are audion.When audion is P-channel audion, audion
Control extremely base stage, the first extremely emitter stage, the second extremely colelctor electrode, when audion is N-channel audion, the control of audion
Make extremely base stage, the first extremely colelctor electrode, the second extremely emitter stage.In a preferred embodiment, the second pole of described three end pipes
By a current source ground connection.
The operation principle triggering coupling circuit of explanation the application below.
DC couples:
Working as SW1, SW2 and be simultaneously switching to Rdc (i.e. SW1 and SW2 switches to the first contact), SW4 is switched to lead-out terminal (i.e.
SW4 switches to the second contact), now input signal can all be delivered to lead-out terminal by amplifier U and electric capacity C, it is achieved DC coupling
Close function.
AC couples:
When SW1 switches to Rac end (i.e. SW1 switches to the second contact), SW2 switches to Cac end, and (i.e. SW2 switches to second and touches
Point), SW4 switches to export (i.e. SW4 switches to the second contact), now the DC component of input signal and the AC compounent quilt of low frequency
Electric capacity Cac and C intercepts, and only the AC signal higher than 10Hz can be for delivery to outfan, it is achieved that AC coupling function.
Low frequency suppresses
When SW4 switches to RlfrjDuring end, (SW4 switches to the first contact), direct current signal and frequency are less than cut off band width frequency
(500KHz) AC signal is blocked, and only frequency is transferred to outfan higher than the signal of cut-off frequency, it is achieved that low frequency
Suppression function, its cut off band width has been also raised to 500KHz simultaneously.Because resistance RlfrjElectric capacity ClfrjWith output resistance load group
Become a high pass filter, it is assumed that resistance RlfrjImpedance be 0, Rload=50 high pass filters above
Cut-off frequency f be
F=1/2 π RloadClfrj
Work as ClfrjTime between 3nf～3uf, cut-off frequency, in the range of 1KHz～1MHz, the most simply regulates electric capacity
ClfrjBoth can obtain preferable cut-off frequency, and regulate this electric capacity and do not interfere with DC coupling and AC coupling.
Existing technology such as Fig. 2 arranges cut-off frequency during low frequency suppression by regulation electric capacity C, its cut-off frequency
Maximum it may be only configured to tens KHz, and the cut-off frequency of low frequency can be arranged 500KHz by the application, even in bandwidth
Arbitrary frequency.
As DC coupling and AC coupling circuit impacted when the prior art of Fig. 2 regulates electric capacity C, expend during debugging and set
The meter personnel substantial amounts of time, the application only need to regulate Rlfrj and Clfrj can not obtain the cut-off frequency wanting to set, and not
Influence whether that other coupled modes normally work.
The present invention is illustrated by use above specific case, is only intended to help and understands the present invention, not in order to limit
The present invention processed.For those skilled in the art, according to the thought of the present invention, it is also possible to make some simply
Deduce, deform or replace.
Claims (8)
1. one kind is triggered coupling circuit, it is characterised in that include single-pole double-throw switch (SPDT) SW1, SW2, SW4, resistance Rdc, Rac,
Rlfrj, electric capacity C, Cac, Clfrj, three end pipe Q and operational amplifier U: operational amplifier U is follower connected mode, and one inputs
End is connected with the moved end of single-pole double-throw switch (SPDT) SW2, and its another input is connected with the moved end of single-pole double-throw switch (SPDT) SW4, its output
End is connected with the control end of one or three end pipe Q；First contact of the not moved end of single-pole double-throw switch (SPDT) SW2 and one end phase of resistance Rdc
Even, the other end of resistance Rdc is connected with the first contact of the not moved end of single-pole double-throw switch (SPDT) SW1；Single-pole double-throw switch (SPDT) SW2 is not
Resistance Rac and the electricity having series connection it is connected between second contact of moved end and the second contact of the not moved end of single-pole double-throw switch (SPDT) SW1
Hold Cac；Second contact of the not moved end of single-pole double-throw switch (SPDT) SW2 is also associated with a direct voltage source；Single-pole double-throw switch (SPDT) SW1's
Moved end is connected to first end of electric capacity C, and second end of electric capacity C is connected to the outfan of operational amplifier U；Single-pole double-throw switch (SPDT)
The moved end of SW1 is connected to trigger the input of coupling circuit, is used for receiving input signal；First pole of described three end pipe Q is connected with
Working voltage source, the second pole ground connection；First contact of the not moved end of single-pole double-throw switch (SPDT) SW4 couples the outfan of circuit with triggering
Between connect and have the resistance R of series connectionlfrjWith electric capacity Clfrj；Second contact of the not moved end of single-pole double-throw switch (SPDT) SW4 is connected to trigger
The outfan of coupling circuit.
2. as claimed in claim 1 triggering couples circuit, it is characterised in that the voltage of described direct voltage source is 1.25V.
3. as claimed in claim 1 triggering couples circuit, it is characterised in that the outfan of described operational amplifier U is with electric capacity C's
A resistance R1 it is also associated with between second end.
4. as claimed in claim 1 trigger coupling circuit, it is characterised in that described three end pipe Q control the of pole and electric capacity C
A resistance R2 it is also associated with between two ends.
5. as claimed in claim 1 triggering couples circuit, it is characterised in that the moved end of single-pole double-throw switch (SPDT) SW1 and triggering coupling
Close and be also associated with a resistance R between the input of circuit.
6. the coupling circuit that triggers as claimed in claim 1 is characterized in that, described three end pipes are audion.
7. the triggering coupling circuit as described in claim 1 or 6, it is characterised in that the second pole of described three end pipes is by an electricity
Stream source ground connection.
8. an oscillograph, it is characterised in that include the triggering coupling circuit as according to any one of claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620587104.1U CN205880029U (en) | 2016-06-16 | 2016-06-16 | Trigger interconnected circuit and oscilloscope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620587104.1U CN205880029U (en) | 2016-06-16 | 2016-06-16 | Trigger interconnected circuit and oscilloscope |
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| Publication Number | Publication Date |
|---|---|
| CN205880029U true CN205880029U (en) | 2017-01-11 |
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ID=57691318
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620587104.1U Active CN205880029U (en) | 2016-06-16 | 2016-06-16 | Trigger interconnected circuit and oscilloscope |
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| CN (1) | CN205880029U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109391160A (en) * | 2018-11-29 | 2019-02-26 | 云南电网有限责任公司西双版纳供电局 | A kind of dedicated decaying wave producer of high-tension apparatus |
-
2016
- 2016-06-16 CN CN201620587104.1U patent/CN205880029U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109391160A (en) * | 2018-11-29 | 2019-02-26 | 云南电网有限责任公司西双版纳供电局 | A kind of dedicated decaying wave producer of high-tension apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 518000 Guangdong Province, Baoan District, Baoan District, Xin'an Street, Xingdong Community, 68 District, Antongda Industrial Factory Area, 4 factories, 3 floors, 5 office buildings, 1-3 floors Patentee after: Shenzhen dingyang Technology Co., Ltd Address before: Shenzhen City, Guangdong province Baoan District 518000 District 68 road left three Antongda Industrial Park, 4 floor Patentee before: Shenzhen Siglent Technologies Co., Ltd. |
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| CP03 | Change of name, title or address |