CN208285289U - A kind of digital switch based on MEMS sensor - Google Patents
A kind of digital switch based on MEMS sensor Download PDFInfo
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- CN208285289U CN208285289U CN201820605113.8U CN201820605113U CN208285289U CN 208285289 U CN208285289 U CN 208285289U CN 201820605113 U CN201820605113 U CN 201820605113U CN 208285289 U CN208285289 U CN 208285289U
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Abstract
A kind of digital switch based on MEMS sensor solves in the high prior art its current source power consumption, stability difference and prior art loop oscillator that there are a large amount of impulsive noises and the technical problems such as versatility is low the utility model relates to circuit drives technical field.The utility model includes high-precision oscillation circuit, exports triangular pulse, including integrating circuit, and the integrating circuit generates triangle wave output signal according to the state of integration current；More current mirroring circuits export the electric current with fixed bias；Pulse generation circuit, two input terminal are connected respectively to triangular pulse and the electric current and output alternating current pulse described in the output end of the high-precision oscillation circuit and more current mirroring circuits, its output clock pulse modulation；Frequency match circuit is buffered, the alternating current pulse of pulse generation circuit output is received；MEMS sensor array receives the related alternating current pulse of buffering frequency match circuit output.The utility model is used for MEMS sensor driving switch.
Description
Technical field
The utility model relates to circuit drives technical fields, and in particular to a kind of digital switch based on MEMS sensor.
Background technique
Sequence circuit pulse to be treated is the alternating current pulse of Larger Dynamic range.But current mainstream MEMS driving
Equipment is not equipped with high speed alternator driven current mode clock, so being difficult to carry out AC signal when carrying out MEMS sensor driving
Driving.Currently, although existing signal generator is quite mature and mostly signal generator can be directly as MEMS
The Switching Power Supply of sensor, but electromagnetic noise always exists the interference of signal generator, directly affects the long-term steady of product
Qualitative and reliability.On the other hand, digital circuit, analog sensor, in terms of, in signal generator
The requirement of output waveform is higher and higher.Traditional circuit, form is more complicated, using more WeChat ID device, is easy to be disliked
The interference of bad environment is used for a long time there are certain hidden danger, and long-term reliability can not be guaranteed.Prior art square wave hair
The stability and frequency characteristic of raw device are all to be improved.
Utility model content
For the above-mentioned prior art, the utility model aim is to provide, its current source power consumption of the solution prior art is high, steady
There are a large amount of impulsive noises and the technical problems such as versatility is low in qualitative difference and prior art loop oscillator.
In order to achieve the above objectives, the technical solution adopted in the utility model is as follows:
A kind of digital switch based on MEMS sensor, comprising:
High-precision oscillation circuit exports triangular pulse TCLK, including integrating circuit；
More current mirroring circuits export the electric current with fixed bias；
Pulse generation circuit, two input terminal are connected respectively to the high-precision oscillation circuit and more current mirrors
Triangular pulse TCLK and the electric current and output alternating current arteries and veins described in the output end of circuit, its output clock pulse modulation
Punching；
Frequency match circuit is buffered, the alternating current pulse of pulse generation circuit output is received；
MEMS sensor array receives the related alternating current pulse of buffering frequency match circuit output.
In above scheme, the high-precision oscillation circuit, including
Integrating circuit, the state according to integration current generate triangle wave output signal；
First level sensitive circuit receives the triangle wave output signal, when the level of the triangle wave output signal reaches
When one reference level, first detection signal is exported；And
Signal adjustment circuit makes the integration current that first state be presented, to change the triangle according to the first detection signal
The voltage level of wave output signal, and according to clock generate edge pulse signal, and according to the edge pulse signal by this three
The voltage level of angle wave output signal changes to the second reference level, and makes the integration current be according to the edge pulse signal
Existing second state, to change the voltage level of the triangle wave output signal.
In above scheme, the pulse generation circuit includes the first NMOS tube, and drain electrode is connected to more current mirrors
The output end of circuit, grid are connected to the output end of the high-precision oscillation circuit, and source electrode is connected to the pulse and produces
The output end of raw circuit.
In above scheme, the source electrode of first NMOS tube is connected to the pulse generation circuit by first resistor
Output end.
In above scheme, the pulse generation circuit further includes the second NMOS tube, and grid is connected to by phase inverter
The output end of the high-precision oscillation circuit, drain electrode are connected to the output end of more current mirroring circuits, and source electrode passes through string
Join the second resistance of connection and the third NMOS tube ground connection of diode connecting-type.
In above scheme, the high-precision oscillation circuit, including
For providing the current source circuit of loop charge and discharge, the inverter circuit for switching loop output and for providing
The buffer circuit of phase difference, current source circuit and inverter circuit constitute loop oscillation structure.
In above scheme, the impulse generating unit further includes overshoot protection circuit, receives the output of inverter circuit
Clock, and the selectively input power of leakage current source circuit.
In above scheme, the current source circuit, including
First power supply；
First current source, high potential end connect the first power supply；
First field-effect tube, source electrode connect the low potential end of the first current source；
Second field-effect tube, source electrode connect the low potential end of the first current source and grounded drain；
Third field-effect tube, the drain electrode of drain electrode the first field-effect tube of connection；
4th field-effect tube, source electrode connect the source electrode of third field-effect tube；
Second source connects the drain electrode of the 4th field-effect tube；
Second current source, high potential end connects the source electrode of third field-effect tube and low potential end is grounded；
First capacitor is used for charge and discharge charge buffer, and one end connects the first power supply and the other end connects the first field-effect
The drain electrode of pipe.
In above scheme, the inverter circuit is used to form interior ring oscillation and the switching output of reflexive feedthrough voltage, including
5th field-effect tube, grid connect the drain electrode of the first field-effect tube；
6th field-effect tube, grid connect the leakage of the drain electrode of the first field-effect tube and drain electrode the 5th field-effect tube of connection
Pole；
7th field-effect tube, grid, drain electrode are all connected with the source electrode of the 6th field-effect tube and source electrode is grounded；
8th field-effect tube, for being switched as bias voltage, the source electrode and source electrode of drain electrode the 6th field-effect tube of connection
Ground connection；
Third power supply；
9th field-effect tube, grid, drain electrode are all connected with the source electrode of the 5th field-effect tube and source electrode connection third power supply；
Tenth field-effect tube, for switching as bias voltage, source electrode connects third power supply and drain electrode connection the 5th
The source electrode of effect pipe；
First phase inverter, input terminal connect the drain electrode of the 5th field-effect tube；
Second phase inverter, third phase inverter and the second capacitor, are sequentially connected in series the first phase inverter, and the second capacitor is additionally coupled to
The grid of five feedback loops constitutes the feedback loop of inverter circuit；
Third capacitor, for provide inner ring oscillation circuit charging, electric discharge, one end connect the first field-effect tube drain electrode and
Other end ground connection；
Tenth field-effect tube, the 8th field-effect tube, grid are connected to the output end of third phase inverter, for defeated
Switch out；
Second field-effect tube, the 4th field-effect tube, grid is connected to the output end of the second phase inverter, for filling
Electric discharge switching.
In above scheme, the buffer circuit is exported for obtaining two-way delay, including
4th phase inverter, input terminal connect the output end of the second phase inverter；
5th phase inverter, hex inverter constitute latch, the 4th phase inverter of series of latches；
7th phase inverter, input terminal connect latch outputs；
First buffer, the 7th phase inverter of connecting, exports the first square-wave pulse；
Second buffer, the 4th phase inverter of connecting, exports the second square-wave pulse；
First field-effect tube, third field-effect tube, grid is connected to the output end of the 4th phase inverter, for filling
Electric discharge switching；
The first capacitor, voltage change end are connected with divider resistance, and divider resistance exports triangular pulse.
In above scheme, the overshoot protection circuit, power supply is quickly released when for crossing oscillation, including
Comparator, high electricity end is connected with reference voltage and low electric end connects the grid of the 5th field-effect tube；
NAND gate, input port connect the output end of comparator and receive an enabling pulse；
11st field-effect tube, grid connect NAND gate output end, drain electrode connection the first field-effect tube drain electrode and
Source electrode ground connection.
In above scheme, the third field-effect tube, source electrode is also connected with the 4th capacitor, and the 4th capacitor is also grounded.
Compared with prior art, the utility model has the beneficial effects that low in energy consumption and offer frequency matching；Improve its pulse
The stability of generator realizes more smooth loop oscillation charge and discharge process under the premise of not influencing output characteristics.
Detailed description of the invention
Fig. 1 is the module diagram of the utility model；
Fig. 2 is the utility model high-precision oscillation circuit schematic illustration；
Fig. 3 is the utility model high-precision oscillation circuit inner part potential point voltage change schematic diagram；
Fig. 4 is the circuit diagram of the first current source of the utility model.
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
The utility model is described further with reference to the accompanying drawing:
Embodiment 1
High-precision oscillation circuit exports triangular pulse TCLK, including integrating circuit；
More current mirroring circuits export the electric current with fixed bias；
Pulse generation circuit, two input terminal are connected respectively to the high-precision oscillation circuit and more current mirrors
Triangular pulse TCLK and the electric current and output alternating current arteries and veins described in the output end of circuit, its output clock pulse modulation
Punching；
Frequency match circuit is buffered, the alternating current pulse of pulse generation circuit output is received；
MEMS sensor array receives the related alternating current pulse of buffering frequency match circuit output.
In above scheme, the high-precision oscillation circuit, including
The integrating circuit, the state according to integration current generate triangle wave output signal；
First level sensitive circuit receives the triangle wave output signal, when the level of the triangle wave output signal reaches
When one reference level, first detection signal is exported；And
Signal adjustment circuit makes the integration current that first state be presented, to change the triangle according to the first detection signal
The voltage level of wave output signal, and according to clock generate edge pulse signal, and according to the edge pulse signal by this three
The voltage level of angle wave output signal changes to the second reference level, and makes the integration current be according to the edge pulse signal
Existing second state, to change the voltage level of the triangle wave output signal.
Embodiment 2
The utility model further includes level suppression circuit comprising first node, the first node pass through the 4th PMOS
Pipe is connected to accessory power supply and is grounded by the 5th NMOS tube, and the grid of the 4th PMOS tube and the 5th NMOS tube is all connected with
To accessory power supply, wherein the first node is connected with the enable end of the high-precision oscillation circuit.More current mirror electricity
Road includes the 6th and the 7th PMOS tube being connected in series, and the source electrode of the 6th PMOS tube is connected to accessory power supply, and the described 7th
The drain electrode of PMOS tube is connected to the output end of more current mirroring circuits, and the grid of the 6th and the 7th PMOS tube is separately connected
First and second bias voltages, first bias voltage are greater than second bias voltage.
For higher versatility and low cost, the utility model uses two buffer registers and a programmable delay
Device constitutes frequency and matches ring, and as buffering frequency match circuit, two buffer register input terminals receive pulse and generate electricity
The alternating current pulse of road output, the input terminal of the output end connection programmable delayer of one of buffer register are related
Alternating current pulse is collectively formed by the output pulse of programmable delayer and the output pulse of another buffer register.
The high-precision oscillation circuit, in conjunction with Fig. 2 and Fig. 3, field-effect tube Q8, Q12 is equivalent to diode, field-effect tube
Q9, Q13 as feedback control bias voltage switch, field-effect tube Q10, Q11 constitute by field-effect tube Q9, Q13 control etc.
Phase inverter is imitated, the output clock waveform of inverter circuit is clock waveform at potential point C, and the input power of current source circuit includes
Current source I1 and current source I2；Reference clock SCLK can be inputted at potential point A, can also be with defeated at scene effect pipe Q5 grid
Enter, it is ground voltage that circuit primary condition, which is set as potential point A, and field-effect tube Q5, Q10, Q9 are in the conductive state, current source I1
It charges to capacitor C1, is sufficient to make field-effect tube Q10 to end when capacitor C1 voltage is raised to, equivalent phase inverter deflects, current potential
Point D voltage becomes ground voltage from voltage VCC, and field-effect tube Q9 ends and field-effect tube Q13 is connected, field-effect tube Q4 conducting,
Current source I1 is released, and current source I2 discharges to capacitor C1, until field-effect tube Q10 is switched on again, constantly repeats this
One process, and then export oscillation square wave.Due to using capacitor and current source in impulse generator, the complete of actual use device is considered
U.S. degree, charge and discharge lead to may have higher peak voltage value in circuit there may be the window of overlapping, and most probably send out
It is raw to be detected at potential point C so comparator is arranged, for discharging in time peak voltage, can also further be arranged
NAND gate logic circuit is driven using the enable signal of processing chip.
As Fig. 4, the first current source I1 include resistance 101, NMOS tube 102, NMOS tube 103, NMOS tube 104,
NMOS tube 105, PMOS tube 106, PMOS tube 107 and PMOS tube 108: one end of the resistance 101 is grounded, described in another termination
The source electrode of NMOS tube 102；The grid of the NMOS tube 102 connects the grid of the NMOS tube 103 and drains and the NMOS tube 105
Source electrode, drain electrode connects the source electrode of the NMOS tube 104, and source electrode connects one end of the resistance 101；The grid of the NMOS tube 103
It is connected together with drain electrode and connects the source electrode of the NMOS tube 105 and the grid of the NMOS tube 102 again, source electrode ground connection；The NMOS
The grid of pipe 104 connects the drain electrode of the PMOS tube 106 and grid and the drain electrode of the NMOS tube 105, and drain electrode connects the PMOS tube
The grid of 106 grid and the grid of the PMOS tube 107 and drain electrode and the PMOS tube 108, source electrode connect the NMOS tube 102
Drain electrode；The grid of the NMOS tube 105 and drain electrode are connected together connects the drain electrode and the NMOS tube of the PMOS tube 106 again
104 grid, source electrode connect the grid of the NMOS tube 103 and the grid of drain electrode and the NMOS tube 102；The PMOS tube 106
Grid connect the PMOS tube 107 grid and drain electrode and the grid of the PMOS tube 108 and the drain electrode of the NMOS tube 104,
Drain electrode connects the grid of the NMOS tube 105 and the grid of drain electrode and the NMOS tube 104, and source electrode meets supply voltage VCC；It is described
The grid of PMOS tube 107 and drain electrode are connected together meets the grid of the PMOS tube 106 and the grid of the PMOS tube 108 and institute again
The drain electrode of NMOS tube 104 is stated, source electrode meets supply voltage VCC；The grid of the PMOS tube 108 connects the grid of the PMOS tube 106
With the grid of the PMOS tube 107 and the drain electrode of drain electrode and the NMOS tube 104, drain electrode is used as current output terminal IOUT, source electrode
Meet supply voltage VCC.
The voltage at 101 both ends of resistance is the threshold voltage of the NMOS tube 103, and the electric current on the resistance 101 is
For the threshold voltage of the NMOS tube 103 divided by the resistance value of the resistance 101, which passes through 107 mirror image of PMOS tube again
To the PMOS tube 106 and the PMOS tube 108, from the drain electrode output current IO UT of the PMOS tube 108.
Above description is only a specific implementation of the present invention, but the protection scope of the utility model is not limited to
It is any to belong to those skilled in the art within the technical scope disclosed by the utility model in this, the change that can be readily occurred in
Change or replace, should be covered within the scope of the utility model.
Claims (1)
1. a kind of digital switch based on MEMS sensor characterized by comprising
High-precision oscillation circuit exports triangular pulse TCLK, including integrating circuit；
More current mirroring circuits export the electric current with fixed bias；
Pulse generation circuit, two input terminal are connected respectively to the high-precision oscillation circuit and more current mirroring circuits
Output end, its export clock pulse modulation described in triangular pulse TCLK and the electric current and output alternating current pulse；
Frequency match circuit is buffered, the alternating current pulse of pulse generation circuit output is received；
MEMS sensor array receives the related alternating current pulse of buffering frequency match circuit output；
The pulse generation circuit includes the first NMOS tube, and drain electrode is connected to the output end of more current mirroring circuits,
Grid is connected to the output end of the high-precision oscillation circuit, and source electrode is connected to the output end of the pulse generation circuit；
The high-precision oscillation circuit, including
Integrating circuit, the state according to integration current generate triangle wave output signal；
First level sensitive circuit receives the triangle wave output signal, when the level of the triangle wave output signal reaches the first ginseng
When examining level, first detection signal is exported；And
Signal adjustment circuit makes the integration current that first state be presented according to the first detection signal, defeated to change the triangular wave
The voltage level of signal out, and edge pulse signal is generated according to clock, and according to the edge pulse signal by the triangular wave
The voltage level of output signal changes to the second reference level, and so that the integration current is presented the according to the edge pulse signal
Two-state, to change the voltage level of the triangle wave output signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820605113.8U CN208285289U (en) | 2018-04-26 | 2018-04-26 | A kind of digital switch based on MEMS sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820605113.8U CN208285289U (en) | 2018-04-26 | 2018-04-26 | A kind of digital switch based on MEMS sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208285289U true CN208285289U (en) | 2018-12-25 |
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ID=64752274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820605113.8U Active CN208285289U (en) | 2018-04-26 | 2018-04-26 | A kind of digital switch based on MEMS sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208285289U (en) |
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2018
- 2018-04-26 CN CN201820605113.8U patent/CN208285289U/en active Active
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Address after: 650000 2F, building 1, Donghua office, No. 19, Bailong Road, Panlong District, Kunming City, Yunnan Province Patentee after: Haiying Deep Sea Technology Co.,Ltd. Address before: 650000 2 floors, East China Office Building 1, 19 Bailong Road, Kunming, Yunnan Province Patentee before: YUNNAN BAOLI TIANTONG INSTRUMENT Co.,Ltd. |