CN205681387U - A kind of burst pulse filtering circuit - Google Patents
A kind of burst pulse filtering circuit Download PDFInfo
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- CN205681387U CN205681387U CN201620578229.8U CN201620578229U CN205681387U CN 205681387 U CN205681387 U CN 205681387U CN 201620578229 U CN201620578229 U CN 201620578229U CN 205681387 U CN205681387 U CN 205681387U
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Abstract
A kind of burst pulse filtering circuit, including quick discharging circuit, quick-charging circuit, electric capacity, Schmidt circuit.Quick discharging circuit and quick-charging circuit are controlled by the output pulse of burst pulse filtering circuit by analog switch or multiway analog switch, selecting a wherein route input pulse discharge electric capacity or charge, the signal on electric capacity obtains exporting pulse through Schmidt circuit.Described burst pulse filtering circuit automatic fitration can bear the positive burst pulse during broad pulse and the negative narrow pulse interference during positive broad pulse, particularly can filter continuous print narrow pulse interference signal；The Breadth Maximum needing positive burst pulse and the negative burst pulse filtered can be adjusted by change charge constant and discharge time constant respectively.Described burst pulse filtering circuit can apply the occasion that be there is a need to filter narrow pulse interference signal in digital signal circuit.
Description
Technical field
The present invention relates to a kind of pulse signal and process circuit, especially a kind of burst pulse filtering circuit.
Background technology
In digital signal circuit, it is often necessary to positive burst pulse and negative burst pulse in pulse signals filter, example
As, filter single narrow disturbing pulse, the Vibrating pulse that filtration machinery switchs, etc..The employing filtered electrical of the most conventional method
Road is filtered, or processes with the MCU laggard line algorithm of sampling.Employing filter circuit filters, when the burst pulse needing filtration
When frequency is higher, there is direct current memory effect in filter circuit, and burst pulse above can affect the filtration of burst pulse below.Use MCU
When laggard line algorithm of sampling processes, MCU itself is easily subject to various interference effect, thus the filtration to burst pulse impacts.
Summary of the invention
In order to solve burst pulse in existing digital pulse signal circuit filter existing for problem, the invention provides one
Burst pulse filtering circuit, including quick discharging circuit, quick-charging circuit, electric capacity, discharge and recharge resistance, Schmidt circuit.
The input pulse of described burst pulse filtering circuit inputs from input pulse end, and output pulse is defeated from output pulse ends
Go out；One end of described quick discharging circuit is connected to input pulse end, and other end is connected to Schmidt circuit input；Described
One end of quick-charging circuit is connected to input pulse end, and other end is connected to Schmidt circuit input；Described discharge and recharge
One end of resistance is connected to input pulse end, and other end is connected to Schmidt circuit input；One end of described electric capacity connects
To Schmidt circuit input, other end be connected to burst pulse filtering circuit publicly or power supply；Described execute
The outfan of close special circuit is output pulse ends.
Described quick discharging circuit includes repid discharge diode, repid discharge switch；Described repid discharge diode is cloudy
Pole is connected to one end of repid discharge switch, and anode is the outfan of quick discharging circuit；Described repid discharge switchs additionally
One end is the input of quick discharging circuit.
Described quick-charging circuit includes quick charge diode, fast charge switch；Described quick charge diode sun
Pole is connected to one end of fast charge switch, and negative electrode is the outfan of quick-charging circuit；Described fast charge switch is additionally
One end is the input of quick-charging circuit.
Described repid discharge switch, fast charge switch are the bilateral analog switch of Automatic level control.Described Schmidt electricity
Road is homophase Schmidt circuit.The Automatic level control end of described repid discharge switch is connected to export the reversed-phase output of pulse；Institute
The Automatic level control end stating fast charge switch is connected to export pulse ends.
Described repid discharge switch, fast charge switch are numerically controlled multiway analog switch.Described multi-channel analog is opened
The digital control end closed is connected to export pulse ends.
The invention has the beneficial effects as follows: described burst pulse filtering circuit allows width to be more than the positive pulse of setting and negative arteries and veins
Rush signal to pass through；Described burst pulse filtering circuit automatic fitration can bear the positive burst pulse during broad pulse, particularly can be fast
Quick-recovery filter capacity filters continuous print positive narrow pulse interference signal；Described burst pulse filtering circuit can the widest arteries and veins of automatic fitration
Negative burst pulse during punching, particularly can bear narrow pulse interference signal by quick-recovery filter capacity filtration continuous print soon；Needed
The positive burst pulse Breadth Maximum of filter can be adjusted by changing charge constant；Need the negative burst pulse maximum width filtered
Degree can be adjusted by changing discharge time constant；Described burst pulse filtering circuit can be applied in digital signal circuit
Be there is a need to filter the occasion of narrow pulse interference signal.
Accompanying drawing explanation
Fig. 1 is burst pulse filtering circuit embodiment 1；
Fig. 2 is input pulse and the output pulse waveform of burst pulse filtering circuit embodiment 1；
Fig. 3 is burst pulse filtering circuit embodiment 2；
Fig. 4 is burst pulse filtering circuit embodiment 3；
Fig. 5 is input pulse and the output pulse waveform of burst pulse filtering circuit embodiment 3；
Fig. 6 is burst pulse filtering circuit embodiment 4；
Fig. 7 is burst pulse filtering circuit embodiment 5；
Fig. 8 is burst pulse filtering circuit embodiment 6.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
It is illustrated in figure 1 burst pulse filtering circuit embodiment 1.In embodiment 1, repid discharge diode, charging resistor, fast
Speed discharge switch is respectively diode D11, resistance R11, switch T11, constitutes quick discharging circuit；Quick charge diode,
Discharge resistance, fast charge switch are respectively diode D12, resistance R12, switch T12, constitute quick-charging circuit；Electric capacity
For electric capacity C11.Schmidt circuit F11 is homophase Schmidt circuit, exports pulse P2 and input pulse P1 homophase in embodiment 1.
The input of the one termination Schmidt circuit of electric capacity C11, i.e. the input A2 of F11, other end is connected to publicly.Diode
The anode of D11 is connected to the input A2 of F11, and negative electrode is connected to input pulse end P1 after connecting with switch T11, as switch T11
During conducting, the unidirectional current of diode D11 flows to as to flow to input pulse end P1 from the input A2 of F11.The moon of diode D12
Pole is connected to the input A2 of F11, and anode is connected to input pulse end P1 after connecting with switch T12, when switching T12 conducting,
The unidirectional current of diode D12 flows to the input A2 for flowing to F11 from input pulse end P1.
Repid discharge switch, fast charge switch are the bilateral analog switch of Automatic level control.In embodiment 1, switch T11,
Switch connection when switch T12 all selects control signal to be high level, the bidirectional analog of switch OFF when control signal is low level
Switch, model can select CD4066, or CD4016.In embodiment 1, Schmidt circuit F11 is homophase Schmidt circuit,
Output pulse P2 (A3 point in Fig. 1) is connected directly to switch the Automatic level control end of T12, and the high and low level of output pulse P2 is respectively
Control switch T12 to connect, turn off；Pulse P2 is after phase inverter F12 (in Fig. 1 in outputPoint) it is connected to switch the level of T11
Controlling end, the high and low level of output pulse P2 controls to switch T11 respectively and turns off, connects.Controlled by output pulse P2, opened
Close T11 with switch T12 in always one in an ON state, another one is off state.
Fig. 2 is input pulse and the output pulse waveform of burst pulse filtering circuit embodiment 1.In Fig. 2, P1 is input arteries and veins
Punching, P2 is output pulse, when P1 low level is normal negative broad pulse, A2 point current potential and A1 point low level current potential one in Fig. 1
Causing, P2 is low level, and switch T11 connects, T12 turns off.Electric capacity C11 is filled by the high level of positive pulse 11 by charging resistor R11
Electricity, makes A2 point current potential rise；Owing to the width of positive pulse 11 is still below at the end of positive pulse 11 less than time T1, A2 point current potential
The upper limit threshold voltage of Schmidt circuit F11, therefore, P2 is maintained low level, and switch T11 maintains and connects；Positive pulse 11 terminates
Time, A1 point again becomes low level and makes electric capacity C11 repid discharge by repid discharge diode D11, making A2 point current potential and A1
Point low level current potential is consistent, recovers the state before arriving to positive pulse 11, and its capacity of resisting disturbance is recovered rapidly, when the tightest
When being connected to continuous print positive narrow pulse interference signal, can filter out equally.The width of positive pulse 12 is again smaller than time T1, therefore,
At the end of positive pulse 12, P2 is maintained low level, and A1 point again becomes low level and makes electricity by repid discharge diode D11
Hold C11 repid discharge, make A2 point current potential consistent with A1 point low level current potential.
Pulse 13 is normal positive broad pulse, when P1 maintains high level time to reach T1 after rising edge 17, the height of P1
Electric capacity C11 is charged by level by charging resistor R11, makes A2 point current potential rise the upper limit threshold electricity reaching Schmidt circuit F11
Pressure, Schmidt circuit F11 output P2 becomes high level from low level at rising edge 18, makes switch T11 shutoff, T12 connect；A1
The high level of point makes electric capacity C11 quick charge by quick charge diode D12, makes A2 point current potential and A1 point high level current potential one
Causing, P2 is maintained high level.
Electric capacity C11 is discharged by the low level of negative pulse 15 by discharge resistance R12, makes A2 point current potential decline；Due to negative arteries and veins
The width of punching 15 remains above the lower limit threshold electricity of Schmidt circuit F11 less than time T2, A2 point current potential at the end of negative pulse 15
Pressure, therefore, P2 is maintained high level, and switch T12 maintains and connects；At the end of negative pulse 15, A1 point again becomes high level and leads to
Cross quick charging diode D12 and make electric capacity C11 quick charge, make A2 point current potential consistent with A1 point high level current potential, recover to negative
State before pulse 15 arriving, its capacity of resisting disturbance is recovered rapidly, when followed by there being continuous print to bear narrow pulse interference letter
Number time, can filter out equally.The width of negative pulse 16 is again smaller than time T2, and therefore, at the end of negative pulse 16, P2 is maintained
High level, A1 point again becomes high level and makes electric capacity C11 quick charge by quick charge diode D12, making A2 point current potential
Consistent with A1 point high level current potential.
When P1 maintains low level time to reach T2 after trailing edge 19, represent that P1 has a broad pulse the most negative, P1
Low level by discharge resistance R12, electric capacity C11 is discharged, make the decline of A2 point current potential reach the lower limit door of Schmidt circuit F11
Sill voltage, Schmidt circuit F11 output P2 becomes low level from high level at trailing edge 20, makes switch T11 connection, T12 close
Disconnected；The low level of A1 point makes electric capacity C11 repid discharge by repid discharge diode D11, makes A2 point current potential and A1 point low level
Current potential is consistent, and P2 is maintained low level.Negative broad pulse 21 width of P1 is more than T2, ties up after the rising edge 23 of negative broad pulse 21
Holding high level time when reaching T1, P2 becomes high level from low level at rising edge 24.
Burst pulse filtering circuit is by the positive burst pulse 11 in P1 signal, positive burst pulse 12, negative burst pulse 15, negative burst pulse 16
All filter out, and positive broad pulse 13, negative broad pulse 21 can be passed through, make that P2 signal occurs corresponding positive broad pulse 14 and negative width
Pulse 22.Output pulse P2 and input pulse P1 homophase, and broad pulse 14 rising edge exported rises than the broad pulse 13 of input
Along T1 lag time, trailing edge T2 lag time.
Time T1 is the maximum positive narrow pulse width that burst pulse filtering circuit can filter.T1 by charge constant,
The upper limit threshold voltage of the high level current potential of input pulse P1, the low level current potential of input pulse P1 and Schmidt circuit F11 is altogether
With impact.Under normal circumstances, the high level current potential of input pulse P1 and low level current potential are definite value, and therefore, the value adjusting T1 can
Carry out with the upper limit threshold voltage by change charge constant or Schmidt circuit.In Fig. 1, charge constant is
Charging resistor R11 and the product of electric capacity C11.
Time T2 is that the maximum that burst pulse filtering circuit can filter bears narrow pulse width.T2 by discharge time constant,
The lower limit threshold voltage of the high level current potential of input pulse P1, the low level current potential of input pulse P1 and Schmidt circuit F11 is altogether
With impact.Under normal circumstances, the high level current potential of input pulse P1 and low level current potential are definite value, and therefore, the value adjusting T2 can
Carry out with the lower limit threshold voltage by change discharge time constant or Schmidt circuit.In Fig. 1, discharge time constant is
The product of discharge resistance R12 and electric capacity C11.
In Fig. 1, diode D11 connects with switch T11 with after resistance R11 parallel connection again, and input pulse P1 first passes through from A1 point
Switch T11, the parallel circuit being then passed through diode D11 and resistance R11 arrive A2 point, flow to relation according to pulse signal, soon
Speed discharge switch is connected in series in before the parallel circuit of repid discharge diode and charging resistor；Diode D12 and resistance
Connecting with switch T12 after R12 parallel connection again, flow to relation according to pulse signal, fast charge switch is connected in series in quick charge
Before the parallel circuit of diode and discharge resistance.The series position of repid discharge switch can also be placed on repid discharge two pole
After the parallel circuit of pipe and charging resistor, similarly, the series position of fast charge switch can also be placed on quick charge
After the parallel circuit of diode and discharge resistance.It addition, electric capacity C11 connect one end publicly can also reconfiguration in burst pulse
The power supply end of filtering circuit.
In Fig. 1, Schmidt circuit F11 can also select anti-phase Schmidt circuit, now output pulse P2 and input pulse
P1 is anti-phase, and output pulse P2 and inversion signal thereof control switch T11, the connected mode of switch T12 needs according to output pulse P2
High and low level respectively control switch T12 turn off, connect, output pulse P2 high and low level respectively control switch T11 connect,
Turn off and carry out.
Fig. 3 show burst pulse filtering circuit embodiment 2, repid discharge diode, charging resistor, repid discharge switch point
Not Wei diode D21, resistance R21, switch T21, quick charge diode, discharge resistance, fast charge switch are respectively two poles
Pipe D22, resistance R22, switch T22, electric capacity is electric capacity C21.Schmidt circuit F21 is homophase Schmidt circuit, exports pulse P2
(B3 point in Fig. 3) is connected directly to switch the Automatic level control end of T22；Pulse P2 is after phase inverter F22 (in Fig. 3 in output
Point) it is connected to switch the Automatic level control end of T21.Embodiment 2 is similar with embodiment 1 structure shown in Fig. 1, and difference one is electricity
Holding the input of a termination Schmidt circuit of C21, other end is connected to the power supply+VCC of burst pulse filtering circuit, no
Being to flow to relation according to pulse signal with part two, the series position of repid discharge switch is at repid discharge diode and charged electrical
After the parallel circuit of resistance, i.e. switch T21 is connected on after diode D21 and resistance R21 parallel circuit.Embodiment 2
Operation principle is same as in Example 1.
Being illustrated in figure 4 burst pulse filtering circuit embodiment 3, repid discharge diode, charging resistor are respectively diode
D31, resistance R31, quick charge diode, discharge resistance be respectively diode D32, resistance R32, repid discharge switch with quickly
Charge switch is numerically controlled multiway analog switch T31, and the normal open switch of T31 is repid discharge switch, and normally closed switch is fast
Speed charge switch；Diode D31, resistance R31 form repid discharge with the normal open switch (C1 in Fig. 4) of multiway analog switch T31
Circuit, diode D32, resistance R32 form quick-charging circuit with the normally closed switch (C0 in Fig. 4) of multiway analog switch T31；Electricity
Hold the input of the termination Schmidt circuit for electric capacity C31, electric capacity C31, i.e. the input C2 of F31, other end is connected to
Publicly.Schmidt circuit F31 is anti-phase Schmidt circuit, it is desirable to the high level of output pulse P2 controls repid discharge switch and connects
Logical, fast charge switch turns off, and low level control repid discharge switch OFF, fast charge switch are connected；In Fig. 4, export arteries and veins
Rushing P2 (C3 point in Fig. 4) and be connected directly to the digital control end of multiway analog switch T31, the high level of output pulse P2 controls many
The normal open switch of path analoging switch T31 is connected, normally closed switch turns off, i.e. the high level of output pulse P2 controls repid discharge switch
Connect, fast charge switch turns off；The normal open switch of the low level control multiway analog switch T31 of output pulse P2 turns off, often
Close switch connection, i.e. the output low level control repid discharge switch OFF of pulse P2, fast charge switch is connected.
Numerically controlled multiway analog switch can select the device of the different models such as CD4051, CD4052, CD4053.Real
Executing in example 3, T31 selects numerically controlled 2 tunnels analogy switch CD4053.
Fig. 5 is input pulse and the output pulse waveform of burst pulse filtering circuit embodiment 3.In Fig. 5, P1 is input arteries and veins
Punching, P2 is output pulse, and when P1 low level is normal negative broad pulse, in Fig. 4, C2 point current potential is low with pulse input end C4 point
Level potential is consistent, and P2 is high level, and T31 normal open switch is connected, normally closed switch turns off.The high level of positive burst pulse 31 is by filling
Electric capacity C31 is charged by electricity resistance R31, makes C2 point current potential increase；Owing to the width of burst pulse 31 exists less than time T1, C2 point current potential
Being still below the upper limit threshold voltage of Schmidt circuit F31 at the end of burst pulse 31, therefore, P2 is maintained high level, and T31 state is tieed up
Hold；Burst pulse 31 terminates, and C4 point again becomes low level and makes electric capacity C31 repid discharge by repid discharge diode D31, makes
C2 point current potential is consistent with C4 point low level current potential, recovers the state before arriving to burst pulse 31, and its capacity of resisting disturbance obtains rapidly
Recover, when followed by when having continuous print positive narrow pulse interference signal, can filter out equally.The width of positive burst pulse 32 is the least
In time T1, therefore, at the end of burst pulse 32, P2 is maintained high level, and C4 point becomes low level and again by quickly putting
Electric diode D31 makes electric capacity C31 repid discharge, makes C2 point current potential consistent with C4 point low level current potential.
Pulse 33 is normal positive broad pulse, when P1 maintains high level time to reach T1 after rising edge 37, the height of P1
Electric capacity C31 is charged by level by charging resistor R31, makes C2 point current potential rise the upper limit threshold electricity reaching Schmidt circuit F31
Pressure, Schmidt circuit F31 output P2 becomes low level from high level at trailing edge 38, makes T31 normal open switch turn off, normally closed open
Close and connect；The high level of C4 point makes electric capacity C31 quick charge by quick charge diode D32, makes C2 point current potential high with C4 point
Level potential is consistent, and P2 is maintained low level.
Electric capacity C31 is discharged by the low level of negative burst pulse 35 by discharge resistance R32, makes C2 point current potential decline；Due to narrow
The width of pulse 35 remains above the lower limit threshold of Schmidt circuit F31 less than time T2, C2 point current potential at the end of burst pulse 35
Voltage, therefore, P2 is maintained low level, and T31 state maintains；Burst pulse 35 terminates, and C4 point becomes high level and again by fast
Speed charging diode D32 makes electric capacity C31 quick charge, makes C2 point current potential consistent with C4 point high level current potential, recovers to burst pulse
31 arrive before state, its capacity of resisting disturbance is recovered rapidly, when followed by when having continuous print to bear narrow pulse interference signal,
Can filter out equally.The width of negative burst pulse 36 is again smaller than time T2, and therefore, at the end of burst pulse 36, P2 is maintained low
Level, C4 point again becomes high level and makes electric capacity C31 quick charge by quick charge diode D32, make C2 point current potential with
C4 point high level current potential is consistent.
When P1 maintains low level time to reach T2 after trailing edge 39, represent that P1 has a broad pulse the most negative, P1
Low level by discharge resistance R32, electric capacity C31 is discharged, make the decline of C2 point current potential reach the lower limit door of Schmidt circuit F31
Sill voltage, Schmidt circuit F31 output P2 becomes high level from low level at rising edge 40, makes T31 normal open switch connect, often
Close switch OFF；The low level of C4 point makes electric capacity C31 repid discharge by repid discharge diode D31, makes C2 point current potential and C4
Point low level current potential is consistent, and P2 is maintained high level.Negative broad pulse 41 width of P1 is more than T2, at the rising edge of negative broad pulse 41
When maintaining high level time to reach T1 after 43, P2 becomes low level from high level at trailing edge 44.
Burst pulse 31 in P1 signal, burst pulse 32, burst pulse 35, burst pulse 36 are all filtered by burst pulse filtering circuit
Fall, and positive broad pulse 33, negative broad pulse 41 can be passed through, make P2 signal occurs corresponding and anti-phase with P1 negative broad pulse
34 and positive broad pulse 42.
In Fig. 5, time T1 is the maximum positive narrow pulse width of the input that burst pulse filtering circuit can filter, and adjusts T1's
Value can be carried out by changing the upper limit threshold voltage of charge constant or Schmidt circuit.In Fig. 4, the charging interval is normal
Number is the product of charging resistor R31 with electric capacity C31.Time T2 is that the maximum of the input that burst pulse filtering circuit can filter is born narrow
Pulse width.The value adjusting T2 can be entered by changing the lower limit threshold voltage of discharge time constant or Schmidt circuit
OK.In Fig. 4, discharge time constant is the product of discharge resistance R32 and electric capacity C31.
In Fig. 4, multiway analog switch T31 uses allotter connection, digital signal C3 control input pulse P1 and divide
It is assigned to quick discharging circuit or quick-charging circuit；Multiway analog switch T31 can also use selector connection, i.e. inputs
Pulse P1 delivers to quick discharging circuit and quick-charging circuit simultaneously, by Digital Signals select quick discharging circuit or
The signal of quick-charging circuit is connected to Schmidt circuit.
In Fig. 4, electric capacity C31 connect one end publicly can also reconfiguration at the power supply end of burst pulse filtering circuit.
In Fig. 4, Schmidt circuit F31 can also select homophase Schmidt circuit.
Fig. 6 show burst pulse filtering circuit embodiment 4, and repid discharge diode, charging resistor are respectively diode
D41, resistance R41, quick charge diode, discharge resistance be respectively diode D42, resistance R42, repid discharge switch with quickly
Charge switch is numerically controlled multiway analog switch T41；Electric capacity is electric capacity C41, a termination Schmidt circuit of electric capacity C41
The input D2 of input, i.e. F41, other end is connected to publicly.Embodiment 4 is similar with the structure of embodiment 3, difference
Place is that one is that multiway analog switch T41 have employed selector connection, and selector connection and allotter connection are from operation principle
It is different what does not has；Two be Schmidt circuit F41 be homophase Schmidt circuit, output pulse P2 and input pulse P1 homophase, defeated
Go out pulse P2 (D3 point in Fig. 6) and be connected directly to the digital control end of multiway analog switch T41, so the normally closed switch of T41 is
Repid discharge switchs, and normal open switch is fast charge switch；Diode D41, resistance R41 are normally closed with multiway analog switch T41's
Switch (D0 in Fig. 6) composition quick discharging circuit, diode D42, resistance R42 (scheme with the normal open switch of multiway analog switch T41
D1 in 6) composition quick-charging circuit.
Fig. 7 show burst pulse filtering circuit embodiment 5.In embodiment 5, repid discharge diode, repid discharge switch
It is respectively diode D51, switch T51, constitutes quick discharging circuit；Quick charge diode, fast charge switch are respectively
Diode D52, switch T52, constitute quick-charging circuit；Electric capacity is electric capacity C51；Schmidt circuit F51 is anti-phase Schmidt
Circuit, therefore, exports pulse P2 anti-phase with input pulse P1 in embodiment 5, output pulse P2 (E3 point in Fig. 7) is connected directly to
The Automatic level control end of switch T51；Pulse P2 is after phase inverter F52 (in Fig. 7 in outputPoint) it is connected to switch the level of T52
Control end.
In embodiment 5, respectively with repid discharge diode, the charging resistor of quick charge diodes in parallel, discharge resistance
It is cancelled, is replaced by the discharge and recharge resistance R51 being connected in parallel on input pulse end E1 and Schmidt circuit input E2.This circuit is
The special case that charging resistor is identical with discharge resistance, can simplify circuit structure.
Fig. 8 show burst pulse filtering circuit embodiment 6.In embodiment 6, repid discharge diode is diode D61, soon
Speed charging diode is diode D62, and repid discharge switch and fast charge switch are numerically controlled multiway analog switch
T61；Electric capacity is electric capacity C61, the input of a termination Schmidt circuit of electric capacity C61, i.e. the input F2 of F61, other end
It is connected to publicly；Multiway analog switch T61 uses allotter connection.Schmidt circuit F61 is homophase Schmidt circuit, output
Pulse P2 and input pulse P1 homophase, output pulse P2 (F3 point in Fig. 8) is connected directly to the numeral control of multiway analog switch T61
End processed, so the normally closed switch of T61 is repid discharge switch, normal open switch is fast charge switch；Diode D61 and multichannel mould
Intending normally closed switch (F0 in Fig. 8) the composition quick discharging circuit of switch T41, diode D62 is normally opened with multiway analog switch T61's
Switch (F1 in Fig. 8) composition quick-charging circuit.
In embodiment 6, respectively with repid discharge diode, the charging resistor of quick charge diodes in parallel, discharge resistance
It is cancelled, is replaced by the discharge and recharge resistance R61 being connected in parallel on input pulse end F4 and Schmidt circuit input F2.This circuit is also
For the special case that charging resistor is identical with discharge resistance, circuit structure can be simplified.
Described burst pulse filtering circuit allows the width positive pulse more than T1 and the width undersuing more than T2 to pass through.
The input signal of described Schmidt circuit is the voltage on electric capacity, it is therefore desirable to Schmidt circuit has high input
Impedance operator.Schmidt circuit can select to have high input impedance charcteristic cmos schmitt phase inverter CD40106,
74HC14, or select that there is the devices such as cmos schmitt NAND gate CD4093 of high input impedance charcteristic, 74HC24.CMOS
The upper limit threshold voltage of schmitt inverter or cmos schmitt NAND gate, lower limit threshold voltage are consolidate relevant to device
Definite value, therefore, the positive narrow pulse width of the input that adjustment can be filtered, negative narrow pulse width need by changing the charging interval normal
Number, discharge time constant are carried out.Constitute homophase Schmidt circuit by schmitt inverter or Schmidt's NAND gate, need
One-level phase inverter is increased after schmitt inverter or Schmidt's NAND gate.
Schmidt circuit can also select to use operational amplifier to constitute, and uses operational amplifier to constitute Schmidt's electricity
Road can change upper limit threshold voltage, lower limit threshold voltage neatly.Similarly, operational amplifier is used to constitute Schmidt's electricity
Lu Shi, needs to use structure and the circuit with high input impedance charcteristic.
In described burst pulse filtering circuit, output pulse is electric to repid discharge by analog switch or multiway analog switch
Road and quick-charging circuit are controlled, and select a wherein route input pulse discharge electric capacity or charge, it is desirable to input
Pulse has enough high level and low level driving force.When actual input pulse driving force has in limited time, it should at narrow arteries and veins
The importation rushing filtering circuit increases one-level input pulse drive circuit, improves and ensure the driving force of input pulse.
Claims (7)
1. a burst pulse filtering circuit, it is characterised in that:
Including quick discharging circuit, quick-charging circuit, electric capacity, discharge and recharge resistance, Schmidt circuit；
The input pulse of described burst pulse filtering circuit inputs from input pulse end, and output pulse is from output pulse ends output；
One end of described quick discharging circuit is connected to input pulse end, and other end is connected to Schmidt circuit input；
One end of described quick-charging circuit is connected to input pulse end, and other end is connected to Schmidt circuit input；
One end of described discharge and recharge resistance is connected to input pulse end, and other end is connected to Schmidt circuit input；
One end of described electric capacity is connected to Schmidt circuit input, and other end is connected to burst pulse filtering circuit publicly
Or power supply；
The outfan of described Schmidt circuit is output pulse ends.
Burst pulse filtering circuit the most according to claim 1, it is characterised in that:
Described quick discharging circuit includes repid discharge diode, repid discharge switch；Described repid discharge diode cathode is even
Being connected to one end of repid discharge switch, anode is the outfan of quick discharging circuit；The other end of described repid discharge switch
Input for quick discharging circuit；
Described quick-charging circuit includes quick charge diode, fast charge switch；Described quick charge diode anode is even
Being connected to one end of fast charge switch, negative electrode is the outfan of quick-charging circuit；The other end of described fast charge switch
Input for quick-charging circuit.
Burst pulse filtering circuit the most according to claim 2, it is characterised in that: described repid discharge switch, quick charge
Switch is the bilateral analog switch of Automatic level control.
Burst pulse filtering circuit the most according to claim 3, it is characterised in that: described Schmidt circuit is homophase Schmidt
Circuit.
Burst pulse filtering circuit the most according to claim 4, it is characterised in that: the Automatic level control of described repid discharge switch
End is connected to export the reversed-phase output of pulse；The Automatic level control end of described fast charge switch is connected to export pulse ends.
Burst pulse filtering circuit the most according to claim 2, it is characterised in that: described repid discharge switch, quick charge
Switch is numerically controlled multiway analog switch.
Burst pulse filtering circuit the most according to claim 6, it is characterised in that: described multiway analog switch digital control
End is connected to export pulse ends.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620578229.8U CN205681387U (en) | 2016-06-15 | 2016-06-15 | A kind of burst pulse filtering circuit |
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| CN201620578229.8U CN205681387U (en) | 2016-06-15 | 2016-06-15 | A kind of burst pulse filtering circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117439581A (en) * | 2023-12-21 | 2024-01-23 | 深圳青铜剑技术有限公司 | Narrow pulse suppression circuit and method |
-
2016
- 2016-06-15 CN CN201620578229.8U patent/CN205681387U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117439581A (en) * | 2023-12-21 | 2024-01-23 | 深圳青铜剑技术有限公司 | Narrow pulse suppression circuit and method |
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