CN209148866U - The peak holding and automatic discharge circuit of numerically controlled ping-pong structure - Google Patents
The peak holding and automatic discharge circuit of numerically controlled ping-pong structure Download PDFInfo
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- CN209148866U CN209148866U CN201821468171.7U CN201821468171U CN209148866U CN 209148866 U CN209148866 U CN 209148866U CN 201821468171 U CN201821468171 U CN 201821468171U CN 209148866 U CN209148866 U CN 209148866U
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Abstract
The utility model relates to peak value sampling fields of measurement, for the peak holding and automatic discharge circuit for proposing a kind of numerically controlled ping-pong structure.This kind of circuit can be realized holding and the automatic discharging of multiple echo,high level signal peak, and reduce the requirement to rear class A/D converter circuit conversion speed.Thus, the technical scheme adopted by the utility model is that, the peak holding and automatic discharge circuit of numerically controlled ping-pong structure, it is made of rising edge detection module, shift control module, controller, AD conversion module and the road N peak holding and automatic discharge circuit, road peak holding and automatic discharge circuit include phase inverter, transconductance type peak value hold module, channel switch, discharge switch and 2 drive modules.The utility model is mainly used in peak value sampling measurement occasion.
Description
Technical field
The utility model relates to peak value sampling fields of measurement, lead more particularly, to laser ranging echo-peak sampled measurements
Domain.Concretely relate to the peak holding and automatic discharge circuit of numerically controlled ping-pong structure.
Background technique
Laser radar so far, is widely used in measuring three-dimensional morphology, unmanned plane avoidance and pilotless automobile from appearance
Equal fields, wherein the most outstanding is application in terms of civil field pilotless automobile.It is continuous with unmanned technology
The indexs such as laser radar range range, angular resolution, range accuracy are also continuously improved in mature, in addition to this, nothing
In terms of requirement of people's driving technology to laser radar is also no longer limited to range measurement, the identification technology of measured object increasingly by
The concern of people.
However during laser ranging, since the laser beam of transmitting is one-wavelength laser, photodetector also has centainly
Wave band limitation, therefore the information such as its color cannot rely on to the identification of target, the monochrome ash of detection reflection echo can only be passed through
Angle value, i.e. reflection echo intensity determine the reflectivity of target object, classify according to different reflected intensitys to measured object,
And then realize the identification of target.Therefore, laser radar should obtain corresponding laser and return while obtaining the laser pulse flight time
The strength information of wave.
To retain echo strength information and realizing the acquisition of echo strength, currently used method is design peak holding electricity
Road for a period of time by the peak holding of echo carries out Analog-digital Converter (hereinafter referred to as AD conversion), to obtain echo strength letter
Breath, and then obtain the single color gradation value of target echo.Meanwhile peak holding circuit should be realized after the completion of AD conversion and be put automatically
Electricity is ready for the holding of next peak value.But when measured object is trees or translucent barrier etc., the same transmitting
Light beam can obtain that the peak of no less than twice return pulse should be acquired more than twice return in order to guarantee the accuracy of target identification
It is worth strength information.And the same exomonental multiecho often has very small time interval, it is assumed that when it is adjacent twice
When the different measured objects that echo measures are at a distance of 3m, the time interval of this twice return is 20ns.At present to continuous impulse peak value
The general approach of sampling is controlled by single-chip microcontroller, i.e., when AD conversion complete when, single-chip microcontroller control peak holding circuit into
Row electric discharge.In order to collect the strength information of the extremely short multiecho of this time interval, at AD conversion speed and single-chip microcontroller
Reason speed proposes high requirement, it is often more important that, traditional peak holding circuit almost cannot achieve to return to repeatedly intensive
The holding of the adjacent peak value of pulse twice of wave.Some scholars propose that a kind of " number+simulation " structure peak holding circuit is come at present
This problem is solved, the switching for keeping channel is realized using multi-disc d type flip flop chip, but its circuit structure is complicated, required D touching
It is more to send out device number of chips, and is not easy to cascade.
Therefore, in order to improve the accuracy of laser radar target identification, circuit cost, feasibility is taken into account and can be expanded
Property, design the peak holding and automatic discharge circuit of a kind of numerically controlled ping-pong structure.
Summary of the invention
In order to overcome the deficiencies of the prior art, the feature multiple, intensive for laser ranging echo, the utility model are intended to mention
A kind of peak holding and automatic discharge circuit of numerically controlled ping-pong structure out.This kind of circuit can be realized multiple echo,high level
The holding of signal peak and automatic discharging, and reduce the requirement to rear class A/D converter circuit conversion speed.For this purpose, the utility model
Adopt the technical scheme that, the peak holding and automatic discharge circuit of numerically controlled ping-pong structure, by rising edge detection module,
Shift control module, controller, AD conversion module and the road N peak holding and automatic discharge circuit are constituted, road peak holding and
Automatic discharge circuit includes phase inverter, transconductance type peak value hold module, channel switch, discharge switch and 2 drive modules；Its
In:
Rising edge detection module detects amplified voltage pulse signal, and output signal makes shift control module
1 output Vout1For height；
Further, the 1st output V of shift control moduleout1By anti-in the 1st tunnel peak holding and automatic discharge circuit
Phase device and a drive module are not turned on discharge switch, at this time transconductance type peak in the 1st tunnel peak holding and automatic discharge circuit
Value keeps module to keep peak value of pulse, obtains the peak value of the 1st pulse and is kept for a period of time；
Further, rising edge detects second rising edge of amplified voltage pulse signal along detection module,
Output signal makes the 2nd output V of shift control moduleout2For height, and other outputs are not changed；
Further, the 2nd output Vout2Pass through another driving mould in the 1st tunnel peak holding and automatic discharge circuit
Block, makes the 1st tunnel peak holding and automatic discharge circuit internal channel switch conduction, in the 1st tunnel peak holding and automatic discharge circuit
Transconductance type peak value hold module does not receive new pulse；
Further, the 2nd output Vout2Pass through phase inverter and the 2nd tunnel in the 2nd tunnel peak holding and automatic discharge circuit
Drive module in peak holding and automatic discharge circuit leads discharge switch in the 2nd tunnel peak holding and automatic discharge circuit not
Logical, transconductance type peak value hold module keeps peak value of pulse in the 2nd tunnel peak holding and automatic discharge circuit at this time, obtains the 2nd
The peak value of pulse is simultaneously kept for a period of time；
Further, identical situation successively occurs in the road 3~N peak holding and automatic discharge circuit；
Transconductance type peak value hold module is exported by AD conversion module in peak holding and automatic discharge circuit.
The channel switch, discharge switch use complementary metal oxide semiconductor switch, and the phase inverter uses NOT gate
Circuit, controller are single-chip microcontroller or programmable gate array FPGA.
The characteristics of the utility model and beneficial effect are:
1) it is worked alternatively by multichannel peak holding circuit, single pulse can only be kept by overcoming conventional peak holding circuit
The shortcomings that peak value, realizes the sampling to multiple, intensive pulse signal peak value, it is ensured that pulse signature messages integrality.
2) multiple, intensive pulse signal peak value is kept with multichannel peak holding circuit respectively, is can obviously reduce pair
The requirement of A/D converter circuit conversion speed relaxes the standard of A/D converter circuit design, reduces costs.
3) switching that multichannel peak holding circuit is carried out using shift control module is greatly reduced the cost of circuit and answered
Polygamy, anti-interference ability is stronger, while also more easily cascading.
Detailed description of the invention:
The multichannel peak holding and automatic discharge circuit of a kind of numerically controlled ping-pong structure of Fig. 1.
In Fig. 1,1 is rising edge detection module, and 2 be shift control module, and 3 be phase inverter, and 4 be transconductance type peak holding mould
Block, 5 be channel switch, and 6 be discharge switch, and 7 be drive module, and 8 be controller.
Specific embodiment
The utility model proposes a kind of multichannel peak holding of numerically controlled ping-pong structure and automatic discharge circuit, packets
It includes: rising edge detection module 1 (1), shift control module 2 (1, for controlling the channel opened and closed), phase inverter 3
(1, every road), transconductance type peak value hold module 4 (1, every road), (1, every road, respective channels do not receive channel switch 5 when conducting
Echo), discharge switch 6 (1, every road, respective channels holding capacitor realizes electric discharge when conducting), drive module 7 (2, every road), control
Device 8 (1) processed.
A kind of peak holding and automatic discharge circuit of numerically controlled ping-pong structure, can be designed as multichannel peak holding
And automatic discharge circuit, before seeing that Fig. 1, measurement start, the output of all control output ends of shift control module 2 is 0, at this time institute
There is channel switch 5 to be not turned on, all discharge switches 6 are connected, and each transconductance type peak value hold module 4 receives pulse, but does not keep arteries and veins
Rush peak value.
After return laser beam is detected, signal is first passed around across resistance amplification module and second level amplification module, is converted into voltage
Pulse signal.
Further, rising edge detection module 1 is detected makes through amplified voltage pulse signal, output signal twice
The 1st output V of shift control moduleout1For height.
Further, the 1st output V of shift control moduleout1By No. 1st phase inverter 3 and drive module 7, make to discharge
Switch 6 is not turned on, and the 1st tunnel transconductance type peak value hold module 4 keeps peak value of pulse at this time, obtains the peak value of the 1st pulse and guarantor
Hold a period of time.
Further, after the 1st tunnel transconductance type peak value hold module 4 obtains first peak value of pulse, rising edge is along detection mould
Block 1 detects second rising edge, and output signal makes the 2nd output V of shift control module 2out2For height, and do not change other
Position output.
Further, the 2nd output Vout2By the 1st tunnel drive module 7, the 1st paths switch 5 is connected, the 1st tunnel across
Conductivity type peak value hold module 4 does not receive new pulse.
Further, the 2nd output Vout2By No. 2nd phase inverter 3 and the 2nd tunnel drive module 7, open the electric discharge of the 2nd tunnel
It closes 6 to be not turned on, the 2nd tunnel transconductance type peak value hold module 4 keeps peak value of pulse at this time, obtains the peak value of the 2nd pulse and holding
For a period of time.
Further, identical situation successively occurs on the road 3~N.
Further, A/D converter circuit is completed within the time that all road N transconductance type peak value hold modules 4 are kept to peak value
AD conversion.
High speed voltage comparator circuit can be used in rising edge detection module 1, and it is V that its inverting input terminal threshold voltage, which is arranged,0, just
Phase input terminal is that amplified laser echo signal amplitude is Vs, when meeting Vs>V0When, rising edge detection module 1 detects transmitting
Signal.
The shift register of high speed, serial input-parallel output, rising edge detection module 1 can be used in shift control module 2
Output signal as its clock signal, often detect the rising edge of a laser echo signal, output end high level is to a high position
One mobile, i.e., when detecting n-th return laser beam rising edge, n output is height before shift register, realizes channel
Switching.
Not circuit can be used in phase inverter 3, obtains the value opposite with 2 corresponding positions output signal of shift control module.
Transconductance type peak holding circuit can be used in transconductance type peak value hold module 4, selects capacitance smaller capacitive C as holding
Capacitor improves charging rate, completes the holding of peak value in a very short period of time.
High-speed complimentary metal oxide semiconductor switch (hereinafter referred to as cmos switch) can be used in channel switch 5, has pole
Short is switched on and off the time, realizes high-speed channel switching.
Hight-speed CMOS switch can be used in discharge switch 6, and with the extremely short time that is switched on and off, auxiliary realizes high-speed channel
Switch, and the electric discharge of holding capacitor in transconductance type peak value hold module 5 is rapidly completed after the completion of AD conversion.
CMOS driving chip can be used in drive module 7, drives channel switch 5 and discharge switch 6, realizes the switch speed of high speed
Degree.
Single-chip microcontroller or FPGA etc. can be used in controller 8, controls timing control module 2, provides enable signal and clearing for it
Signal determines peak holding time span.
To achieve the above object, it designs a kind of two-way of numerically controlled ping-pong structure or multichannel peak holding and puts automatically
Circuit, comprising: rising edge detection module 1 (1), failing edge detection module 2 (1, every road in addition to the 1st tunnel), monostable touching
It sends out on module 3 (1, every road), transconductance type peak value hold module 4 (1, every road), channel switch 5 (1, every road), discharge switch 6 is (every
1, road).
High speed voltage comparator circuit can be used in rising edge detection module 1, and it is V that its inverting input terminal threshold voltage, which is arranged,0, can
It is designed as V0=0.5V, normal phase input end are that amplified laser echo signal amplitude is Vs, when meeting Vs>V0When, rising edge inspection
It surveys module 1 and detects transmitting signal.
The shift register of high speed, serial input-parallel output, rising edge detection module 1 can be used in shift control module 2
Output signal as its clock signal, when each rising edge arrives, high level is one mobile to a high position, and respective channels electric discharge is opened
It closes 7 to be not turned on, upper passage channel switch 6 is connected.
Not circuit can be used in phase inverter 3, obtains the value opposite with 2 corresponding positions output signal of shift control module.
Transconductance type peak holding circuit can be used in transconductance type peak value hold module 4, selects capacitance smaller capacitive as holding
Capacitor improves charging rate, completes the holding of peak value in a very short period of time, can choose the holding capacitor of 100pF.
Hight-speed CMOS switch can be used in channel switch 5, with the extremely short time that is switched on and off, realizes that high-speed channel is cut
It changes.
Hight-speed CMOS switch can be used in discharge switch 6, and with the extremely short time that is switched on and off, auxiliary realizes high-speed channel
Switch, and the electric discharge of holding capacitor in transconductance type peak value hold module 4 is rapidly completed after the completion of AD conversion.
CMOS driving chip can be used in drive module 7, drives channel switch 5 and discharge switch 6, realizes the switch speed of high speed
Degree.
Single-chip microcontroller or FPGA etc. can be used in controller 8, controls timing control module 2, provides enable signal and clearing for it
Signal determines peak holding time span.
Claims (2)
1. a kind of peak holding and automatic discharge circuit of numerically controlled ping-pong structure, characterized in that detect mould by rising edge
Block, shift control module, controller, AD conversion module and the road N peak holding and automatic discharge circuit are constituted, road peak holding
It include phase inverter, transconductance type peak value hold module, channel switch, discharge switch and 2 drive modules with automatic discharge circuit；
Wherein:
Rising edge detection module detects amplified voltage pulse signal, and output signal makes shift control module the 1st
Export Vout1For height；
Further, the 1st output V of shift control moduleout1Pass through phase inverter in the 1st tunnel peak holding and automatic discharge circuit
It is not turned on discharge switch with a drive module, transconductance type peak value is protected in the 1st tunnel peak holding and automatic discharge circuit at this time
It holds module and keeps peak value of pulse, obtain the peak value of the 1st pulse and kept for a period of time；
Further, rising edge detects second rising edge of amplified voltage pulse signal along detection module, output
Signal makes the 2nd output V of shift control moduleout2For height, and other outputs are not changed；
Further, the 2nd output Vout2By another drive module in the 1st tunnel peak holding and automatic discharge circuit, make
1 tunnel peak holding and automatic discharge circuit internal channel switch conduction, transconductance type peak in the 1st tunnel peak holding and automatic discharge circuit
Value keeps module not receive new pulse；
Further, the 2nd output Vout2It is protected by phase inverter in the 2nd tunnel peak holding and automatic discharge circuit and the 2nd road peak value
Hold with drive module in automatic discharge circuit, be not turned on discharge switch in the 2nd tunnel peak holding and automatic discharge circuit, at this time
Transconductance type peak value hold module keeps peak value of pulse in 2nd tunnel peak holding and automatic discharge circuit, obtains the peak of the 2nd pulse
It is worth and is kept for a period of time；
Further, identical situation successively occurs in the road 3~N peak holding and automatic discharge circuit；
Transconductance type peak value hold module is exported by AD conversion module in peak holding and automatic discharge circuit.
2. the peak holding and automatic discharge circuit of numerically controlled ping-pong structure as described in claim 1, characterized in that institute
Channel switch, discharge switch are stated using complementary metal oxide semiconductor switch, the phase inverter uses not circuit, controller
For single-chip microcontroller or programmable gate array FPGA.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821468171.7U CN209148866U (en) | 2018-09-08 | 2018-09-08 | The peak holding and automatic discharge circuit of numerically controlled ping-pong structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821468171.7U CN209148866U (en) | 2018-09-08 | 2018-09-08 | The peak holding and automatic discharge circuit of numerically controlled ping-pong structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109143204A (en) * | 2018-09-08 | 2019-01-04 | 天津大学 | The peak holding and automatic discharge circuit of numerically controlled ping-pong structure |
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2018
- 2018-09-08 CN CN201821468171.7U patent/CN209148866U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109143204A (en) * | 2018-09-08 | 2019-01-04 | 天津大学 | The peak holding and automatic discharge circuit of numerically controlled ping-pong structure |
| CN109143204B (en) * | 2018-09-08 | 2022-05-20 | 天津大学 | Peak value holding and automatic discharging circuit of digital control ping-pong structure |
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