CN208190611U - Reading circuit applied to Hall current sensor - Google Patents
Reading circuit applied to Hall current sensor Download PDFInfo
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- CN208190611U CN208190611U CN201820467653.4U CN201820467653U CN208190611U CN 208190611 U CN208190611 U CN 208190611U CN 201820467653 U CN201820467653 U CN 201820467653U CN 208190611 U CN208190611 U CN 208190611U
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Abstract
The utility model relates to a kind of reading circuits applied to Hall current sensor, provide a front end rotatory current module, signal reads main body circuit and ripple cancellation loop RRL circuit；Front end rotatory current module includes using the low frequency channel of rotary Hall sensor and using non-rotating Hall sensor and being used to form binary channels framework and increasing the high frequency channel of overall bandwidth；Ripple cancellation loop RRL circuit accesses low frequency channel；Low frequency channel is controlled using rotatory current, and ripple cancellation loop RRL circuit uses chop control, to eliminate circuit offset voltage and 1/f noise；Low frequency channel and the high frequency channel access the signal and read main body circuit.The utility model provides a kind of reading circuit applied to Hall current sensor, using two-channel circuit structure, and introduces ripple cancellation loop RRL, can also obtain bigger system bandwidth while can effectively eliminating circuit offset voltage and 1/f noise.
Description
Technical field
The utility model relates to a kind of reading circuits applied to Hall current sensor.
Background technique
It with the development of science and technology and is constantly progressive, electric energy has become a part indispensable in human lives, and electricity consumption
Safety is even more focus concerned by people.Traditional current detection means, such as current divider, mutual inductor, Rogowski coil etc. are due to surveying
The reasons such as accuracy of measurement is low, and volume is big are unfavorable for integrating, and can not also work in complex condition.And Hall current sensor relies on
It its high-precision, high reliability, small size and the advantages such as is easily integrated and has become research hotspot, product is widely used in vapour
Vehicle electronics, Industry Control, power management, space flight and the fields such as military.Although Hall current sensor has such as above-mentioned very much
Advantage, but for frequency very high RST, common sensor can not just be used to be detected, so bandwidth limits Hall electricity
Application of the flow sensor on high frequency.Exploring the method for improving Hall current sensor bandwidth of operation becomes recent researches hot spot
In hot spot.
Hall current sensor is a kind of sensor for converting magnetic signal to electric signal output, but this signal is very micro-
Weak, as low as microvolt is to several millivolts of this ranks, and is contaminated with interference signal and noise.Meanwhile leading on this faint signal
The size of the often common-mode voltage of one magnitude more several greatly than the signal of superposition, this common-mode voltage depends on application, has
It even can achieve several volts.Therefore integrated reading circuit is needed to handle this faint signal.Currently, being used for Hall
The reading circuit of current sensor is generally single channel band copped wave instrument amplifier, but the signal bandwidth of the structure is by low pass filtered
The limitation of wave device-three dB bandwidth.The method for increasing signal bandwidth is usually to increase chopping frequency, however big chopping frequency is often
Increase the non-ideal factors such as the injection of chopper switches charge and clock feedthrough, to introduce bigger residual offset ripple.
In addition, also will cause signal aliasing in addition to limitation system bandwidth using wave digital lowpass filter, and analog filter is used to need
Bigger time constant sufficiently eliminates ripple, causes chip area to increase in this way.
Summary of the invention
It is existing to overcome the purpose of this utility model is to provide a kind of reading circuit applied to Hall current sensor
Defect present in technology.
To achieve the above object, the technical solution of the utility model is: a kind of reading applied to Hall current sensor
Circuit provides a front end rotatory current module, signal reads main body circuit and ripple cancellation loop RRL circuit；The front end
Rotatory current module includes using the low frequency channel of rotary Hall sensor and using non-rotating Hall sensor and for shape
Channel framework in pairs increases the high frequency channel of overall bandwidth；The ripple cancellation loop RRL circuit accesses the low frequency channel；
The low frequency channel is controlled using rotatory current, and the ripple cancellation loop RRL circuit uses chop control, to eliminate circuit mistake
Adjust voltage and 1/f noise；The low frequency channel and the high frequency channel access the signal and read main body circuit.
In an embodiment of the utility model, the high frequency channel includes: first outer bias current unit, the first Hall
Disk, the first input capacitance, the second input capacitance, the first amplifier unit, first resistor, second resistance, the second amplifier unit, first
Output capacitance, the second output capacitance；First outer bias current unit is connected with first Hall disc；Described first suddenly
You access the first amplifier unit through first input capacitance and second input capacitance respectively by disk；First fortune
It puts unit and accesses the second amplifier unit through the first resistor and the second resistance respectively；The second amplifier unit
The signal, which is accessed, through first output capacitance and second output capacitance respectively reads main body circuit.
In an embodiment of the utility model, the low frequency channel includes: second outer bias current unit, the second Hall
Disk, rotatory current circuit, third input capacitance, the 4th input capacitance, third amplifier unit, 3rd resistor, the 4th resistance, the 4th
Amplifier unit, the first output resistance, the second output resistance, the first chopper；Second outer bias current unit with it is described
Second Hall disc is connected；First Hall disc is connected with the rotatory current circuit；The rotatory current circuit is respectively through institute
It states third input capacitance and the 4th input capacitance accesses the third amplifier unit；The third amplifier unit passes through respectively
The 3rd resistor and the 4th resistance access the four high guaily unit unit；The four high guaily unit unit is respectively through described
One output resistance and second output resistance access the signal and read main body circuit；First chopper and described the
The output end of four high guaily unit unit is connected, and accesses the four high guaily unit unit through the feedback resistance in the four high guaily unit unit
Input terminal；The ripple cancellation loop RRL circuit connection is in the four high guaily unit unit both ends.
In an embodiment of the utility model, the four high guaily unit unit further includes one second chopper.
In an embodiment of the utility model, the ripple cancellation loop RRL circuit include: the 5th resistance, the 6th resistance,
Third chopper, the 5th amplifier unit, the first inductive reactance, the second inductive reactance, first capacitor and the second capacitor；Described
One end of five resistance and one end of the 6th resistance are respectively connected to the input terminal of the four high guaily unit unit；5th electricity
The other end of the other end of resistance and the 6th resistance is respectively connected to the input terminal of the 5th amplifier unit；The first capacitor
One end and one end of the second capacitor are respectively connected to the input terminal of the 5th amplifier unit, the other end of the first capacitor with
And second the other end of capacitor be respectively connected to the output end of the 5th amplifier unit；The third chopper and the 5th fortune
The output end for putting unit is connected；The third chopper is accessed through an inductive reactance and second inductive reactance respectively
The output end of the four high guaily unit unit.
In an embodiment of the utility model, the first amplifier unit, the second remote amplifier unit, third fortune
Put unit, the four high guaily unit unit is all made of the fully differential two-stage telescopic OPAMP that Class-A is exported.
In an embodiment of the utility model, it includes one the 6th amplifier unit that the signal, which reads main body circuit,.
Compared to the prior art, the utility model has the following beneficial effects: the utility model is in classical single channel band
On the basis of copped wave instrument amplifier structure, increases a hf channel and form binary channels framework to increase the band of total system
Width, and rotatory current technology and wave chopping technology are used, realize the elimination to Hall disc and offset voltage and 1/f noise.Separately
Outside due to using two choppers in the input of amplifier, output end, bigger ripple can be generated at chopping frequency, in order to have
The inhibition output ripple amplitude of effect introduces ripple cancellation loop RRL to reduce the ripple.It can effectively eliminate circuit offset voltage
With bigger system bandwidth can also be obtained while 1/f noise.Have in the reading circuit field of Hall current sensor huge
Big application.
Detailed description of the invention
Fig. 1 is traditional single channel band copped wave instrument amplifier structure chart.
Fig. 2 is the system construction drawing of the reading circuit of Hall current sensor in the utility model.
Fig. 3 is low frequency channel and high frequency channel baud curve graph in the utility model.
Fig. 4 is rotatory current schematic diagram in the utility model.
Fig. 5 is ripple cancellation loop RRL schematic diagram in the utility model.
Fig. 6 is ripple cancellation loop RRL simplified structure diagram in the present invention.
Specific embodiment
With reference to the accompanying drawing and existing software, the technical solution of the utility model is specifically described.In the explanation
Existing software involved in the process is not the object that the utility model is protected, and the utility model only protects the knot of the device
Structure and connection relationship.
The utility model provides a kind of reading circuit applied to Hall current sensor, comprising: front end rotatory current mould
Block, signal read main body circuit and ripple cancellation loop RRL circuit；Front end rotatory current module includes being passed using rotary Hall
It the low frequency channel of sensor and using non-rotating Hall sensor and is used to form binary channels framework and increases the height of overall bandwidth
Frequency access；Ripple cancellation loop RRL circuit accesses low frequency channel；Low frequency channel is controlled using rotatory current, ripple cancellation loop
RRL circuit uses chop control, to eliminate circuit offset voltage and 1/f noise；Low frequency channel and high frequency channel access
Signal reads main body circuit.
In the present embodiment, as shown in Fig. 2, high frequency channel include: first outer bias current unit, the first Hall disc,
It is first input capacitance, the second input capacitance, the first amplifier unit, first resistor, second resistance, the second amplifier unit, first defeated
Capacitor, the second output capacitance out；First outer bias current unit is connected with the first Hall disc；First Hall disc is respectively through first
Input capacitance and the second input capacitance access the first amplifier unit；First amplifier unit is respectively through first resistor and the second electricity
Resistance the second amplifier unit of access；Second amplifier unit is read through the first output capacitance and the second output capacitance access signal respectively
Main body circuit.
In the present embodiment, as shown in Fig. 2, low frequency channel include: second outer bias current unit, the second Hall disc,
Rotatory current circuit, third input capacitance, the 4th input capacitance, third amplifier unit, 3rd resistor, the 4th resistance, the 4th fortune
Put unit, the first output resistance, the second output resistance, the first chopper；Second outer bias current unit and the second Hall disc
It is connected；First Hall disc is connected with rotatory current circuit；Rotatory current circuit is inputted through third input capacitance and the 4th respectively
Capacitor accesses third amplifier unit；Third amplifier unit accesses four high guaily unit unit through 3rd resistor and the 4th resistance respectively；
Four high guaily unit unit reads main body circuit through the first output resistance and the second output resistance access signal respectively；First chopper
It is connected with the output end of four high guaily unit unit, and the input through the feedback resistance access four high guaily unit unit in four high guaily unit unit
End；Ripple cancellation loop RRL circuit connection is in four high guaily unit unit both ends.
In the present embodiment, four high guaily unit unit further includes one second chopper.
In the present embodiment, as shown in figure 5, ripple cancellation loop RRL circuit includes: the 5th resistance, the 6th resistance, third
Chopper, the 5th amplifier unit, the first inductive reactance, the second inductive reactance, first capacitor and the second capacitor；5th resistance
One end and one end of the 6th resistance are respectively connected to the input terminal of four high guaily unit unit；The other end of 5th resistance and the 6th electricity
The other end of resistance is respectively connected to the input terminal of the 5th amplifier unit；One end of first capacitor and one end of the second capacitor connect respectively
Enter the input terminal of the 5th amplifier unit, the other end of the other end of first capacitor and the second capacitor is respectively connected to the 5th amplifier list
The output end of member；Third chopper is connected with the output end of the 5th amplifier unit；Third chopper respectively through an inductive reactance with
And second inductive reactance access four high guaily unit unit output end.
In the present embodiment, the first amplifier unit, the second remote amplifier unit, third amplifier unit, four high guaily unit unit are equal
The fully differential two-stage telescopic OPAMP exported using Class-A.
In the present embodiment, it includes one the 6th amplifier unit that signal, which reads main body circuit,.
Further, in order to allow skilled in the art realises that the technical solution of the utility model, below with reference to specific electricity
Road is illustrated.
Further, in the present embodiment, it by using rotatory current technology and wave chopping technology, provides one kind and is applied to
The high bandwidth of Hall current sensor, high-precision reading circuit.Traditional single channel band copped wave instrument amplifier structure such as Fig. 1 institute
Show.Increase a high frequency channel on the basis of traditional single channel band copped wave instrument amplifier, using rotatory current technology,
Wave chopping technology and ripple cancellation loop RRL eliminate offset voltage and 1/f noise, and use 0.18 μm of CMOS technology reality of SMIC
It is existing.It is emulated by Spectre, integrated circuit-three dB bandwidth is up to 675kHz, and Ripple Suppression ratio is up to 65.6dB, equivalent inpnt ginseng
Examining noise power spectral density PSD is 21nV/ √ Hz, and common-mode rejection ratio CMRR is 120dB, and the simulation result of whole design reaches
The reading circuit requirement of high bandwidth, high-precision hall current sensor.
Further, the structure chart of whole system is as shown in Figure 2.The structure is made of two bars channels, a use
The low frequency channel (LFP) of rotary Hall sensor, another high frequency channel (HFP) using non-rotating Hall sensor, two
Access accesses signal and reads main body circuit.
As shown in Fig. 2, in low frequency channel, Hall disc is directly connected directly with rotatory current circuit, rotatory current circuit
Output end passes through the capacitor C in the accessinWith the CCIA first order amplifier A in the access1It is connected, amplifier A1Output end passes through electricity
Hinder R1With the second level the CCIA amplifier A in the access2It is connected, amplifier A2Output end passes through resistance R3With output stage A3It is connected.Meanwhile
In A2Output end connection ripple cancellation loop RRL electronic feedback returns to A2Input terminal.In high frequency channel, high frequency channel connection side
Formula and structure are substantially identical as low frequency channel, in addition to not having rotatory current circuit module and ripple cancellation loop RRL module.
Further, in low frequency channel, the Hall voltage that Hall disc generates is modulated to by rotatory current circuit module
Speed fspin, and Hall disc offset voltage is then maintained at DC state.Most Hall offset voltage is entered capacitor
CinBarrier, and Hall voltage and amplifier itself offset voltage are then amplified by subsequent amplifier.Hall voltage is by A2The chopper CH at place2
Solution recalls to direct current, exports after output stage is amplified, and offset voltage is then modulated by the chopper, in A2Output end is with rectangle ripple
Waveshape occurs.The ripple is inhibited by ripple cancellation loop RRL circuit, and remnants ripple continues being filtered by output stage, from
And reduce integrated circuit ripple amplitude, greatly improve system accuracy.
Further, in order to guarantee that the gain of two accesses has good matching, high frequency channel and low frequency channel are adopted
With identical Hall disc and amplifier structure.Wherein, Hall disc includes four ports using cross-shaped configuration made of N-well process,
It can be equivalent to a Wheatstone bridge.Amplifier A1The fully differential two-stage telescoping structure exported using Class-A
(Telescopic OTA), amplifier A2Same use and A1The same structure, but it is A1Reduction version, consumption electric current it is smaller.Fortune
Put A3Using two-stage fully differential Class-AB push-pull type structure.
Wherein, first order amplifier uses capacitively coupled instrument amplifier (CCIA), with 100 times of closed loop gain.It adopts
With condenser coupling amplifier there are three advantage: it is more low in energy consumption than current feedback and three amplifier type instrument amplifiers first；Its
It is secondary, it can handle bigger common-mode voltage range；Finally, the structure can make front end Hall sensor freely adjust biased electrical
Stream.Second level amplifier uses closed loop gain for 20 times of sign-changing amplifier.However, only low frequency channel uses rotatory current technology
And wave chopping technology.Two access bandwidth having the same, so the output stage of twice of closed loop gain smooth can lead to high frequency
Road and low frequency channel combine.
Further, the ripple generated by the rotatory current technology and wave chopping technology of low frequency channel appears in A2Output
End, the ripple are perceived by ripple cancellation loop RRL, and are injected into A by compensating electric current2Input terminal and inhibit.Such as Fig. 5 and
Shown in Fig. 6, in A2The ripple of output end passes through inductive reactance RSCurrent ripples are converted to, meanwhile, which is chopped into device
CH3It demodulates and passes through integrator and be stored in capacitor CintOn.Finally by resistance RcIt is converted to compensation electric current I2It is injected into A2's
Input terminal, and electric current I is exported with the first order1It offsets, to inhibit ripple amplitude.Remnants ripple is further by output stage A3、R0、
C0、R3The first-order low-pass wave of composition is eliminated.
Further, in order to ensure the trap that low frequency channel is generated by ripple cancellation loop " can be filled out by high frequency channel
Mend ", and composite chip area factor considers, low frequency and high frequency channel crossover frequency fcrossIt is set as 2kHz, it is by output stage
Time constant R0C0It determines, which must be much smaller than speed, and by resistance R0With capacitor C0It is configured,
fcross=1/(2πR0C0).In order to guarantee that two accesses have smooth frequency response curve, R3C3And R0C0There must be good
With property, that is, require C3/C0=R0/R3, guarantee that output stage has identical gain.The baud curve of low frequency channel and high frequency channel is such as
Shown in Fig. 3.
Further, front end Hall disc generallys use N-well process and is made, and includes four ports, can be equivalent to one
A Wheatstone bridge.Due to the inhomogeneities of Hall disc doping concentration and the difference of N well depth, can all Hall sensor be made to produce
Raw very serious offset voltage and low frequency 1/f noise, and the hall signal that Hall sensor generates is passing through instrument amplifier
When amplification, it can also be superimposed imbalance and the noise of some amplifiers.The magnitude of these non-ideal factors is very big, in many cases its amount
Grade greatly to mask Hall disc export signal.Therefore, it is necessary to take the relevant technologies to eliminate the imbalance of Hall sensor and make an uproar
Sound.
Rotatory current technology is applied in Hall current sensor as a kind of method of elimination dynamic imbalance.Electric rotating
Flow Technique is to change Hall voltage V by changing the position of Hall element control terminal and output endHallWith offset voltage V offset
Polarity.As shown in figure 4, Hall voltage is modulated onto speed by periodically recyclingf spinPlace, and offset voltage is still
Be maintained on primary frequency, then Hall element output end voltage show as the offset voltage of direct current and the Hall voltage exchanged it
With.When bias current flows from left to right, Hall element output end voltage are as follows:
(1)
When bias current rotates 90o, when flowing from the top to the bottom, Hall element output end voltage are as follows:
(2)
Use rotatory current technology Hall voltage can be modulated into frequency forf spinAC signal, and offset voltage is then
It is maintained at direct current signal, the most of input capacitance C by subsequent amplifier of the misalignment signal of direct currentinIt obstructs and eliminates.Due to Hall
The mismatch of disk N trap, leading to the misalignment signal of Hall sensor is not a constant, and in the value of each rotatable phase
It is different.Misalignment signal after rotatory current technology becomes an AC variable, and can pass through capacitor CinAnd it is amplified.By solution
After tune, this misalignment signal appears in second level A together with the offset voltage of amplifier is in the form of square wave2Output end, this is just
It is the ripple that circuit generates.The magnitude of the ripple is very big, and seriously affects last output signal, it is therefore necessary to increase by one
A ripple cancellation loop module eliminates it.
In the present embodiment, the ripple cancellation loop RRL schematic diagram of use is as shown in figure 5, amplifier A2Output end pass through
Inductive reactance RSWith chopper CH3It is connected, chopper is connected to amplifier A0Input terminal, then pass through resistance RCIt is connected to amplifier A2
Input terminal, form a negative-feedback.Herein, signal passes through chopper CH1When polarity be changed, so in order to guarantee the second level
Amplifier feedback loop is (from A2Output end, by R2Connect back to A2Input terminal) be constantly in negative-feedback state, need using cutting
Wave device CH1Feedback signal polar demodulation is returned.Pass through inductive reactance RS, second level A2The voltage ripple of output end is converted to
Current ripples.Meanwhile the current ripples are chopped into device CH3It demodulates and passes through integrator and be stored in capacitor CintOn.Finally by electricity
Hinder RcIt is converted to compensation electric current and is injected into A2Input terminal.Compensation electric current I2Electric current I is exported by the first order1It offsets, to press down
Ripple amplitude is made.For simplifying the analysis, ripple cancellation loop RRL can be simplified to structure as shown in Figure 6.Wherein chopper
CH1、CH2And CH3It can be equivalent to a CHeff, ripple cancellation loop RRL can be regarded as a DC servo loop in this way,
Be conducive to circuit analysis.Assuming that A2It is an ideal amplifier, then A2Output end voltage VOLIt can indicate are as follows:
(3)
In the feedback loop, from VOLTo VCTransfer function can indicate are as follows:
(4)
So formula (3) can be write as again:
(5)
Therefore, from VinTo VOLTransfer function H (s) can indicate are as follows:
(6)
Formula (6) meets classical feedback theory formula, it is possible to know that the closed loop gain A β of ripple cancellation loop can
To indicate are as follows:
(7)
So high pass angular frequency f0Calculation formula are as follows:
(8)
Finally obtain direct current transmission function are as follows:
(9)
From the above analysis, it is known that equivalent chopper CHeffEffect be that high-pass filter is converted at chopping frequency
At a notch filter.In the present embodiment, R1=50K Ω, R2=1M Ω, RS=10M Ω, Cint=20pF, RC=2.5M Ω and A0=
100dB, theoretically Ripple Suppression ratio can achieve 66dB, notch-width 2f0=640Hz。
Further, in the present embodiment, using 0.18 μm of CMOS technology of SMIC, designed circuit is emulated
Verifying.It is emulated by Spectre, integrated circuit-three dB bandwidth is up to 675kHz, and Ripple Suppression ratio is 65.6dB, inputs equivalent ginseng
Examining noise power spectral density PSD is 21nV/ √ Hz, and common-mode rejection ratio CMRR is 120dB, meets high bandwidth, high-precision hall electricity
The requirement of flow sensor reading circuit.
It is the preferred embodiment of the utility model above, it is all to change according to made by technical solutions of the utility model, it is produced
Function without departing from technical solutions of the utility model range when, belong to the protection scope of the utility model.
Claims (7)
1. a kind of reading circuit applied to Hall current sensor characterized by comprising front end rotatory current module, letter
Number read main body circuit and ripple cancellation loop RRL circuit；The front end rotatory current module includes being passed using rotary Hall
It the low frequency channel of sensor and using non-rotating Hall sensor and is used to form binary channels framework and increases the height of overall bandwidth
Frequency access；The ripple cancellation loop RRL circuit accesses the low frequency channel；The low frequency channel and the high frequency channel connect
Enter the signal and reads main body circuit.
2. a kind of reading circuit applied to Hall current sensor according to claim 1, which is characterized in that the height
Frequency access includes: first outer bias current unit, the first Hall disc, the first input capacitance, the second input capacitance, the first amplifier
Unit, first resistor, second resistance, the second amplifier unit, the first output capacitance, the second output capacitance；Outside described first partially
Current unit is set to be connected with first Hall disc；First Hall disc is respectively through first input capacitance and described
Two input capacitances access the first amplifier unit；The first amplifier unit is respectively through the first resistor and described second
Resistance accesses the second amplifier unit；The second amplifier unit is respectively through first output capacitance and described second defeated
Capacitor accesses the signal and reads main body circuit out.
3. a kind of reading circuit applied to Hall current sensor according to claim 2, which is characterized in that described low
Frequency access includes: second outer bias current unit, the second Hall disc, rotatory current circuit, third input capacitance, the 4th input
Capacitor, third amplifier unit, 3rd resistor, the 4th resistance, four high guaily unit unit, the first output resistance, the second output resistance,
One chopper；Second outer bias current unit is connected with second Hall disc；First Hall disc and the rotation
Turn current circuit to be connected；The rotatory current circuit is accessed through the third input capacitance and the 4th input capacitance respectively
The third amplifier unit；The third amplifier unit is respectively through the 3rd resistor and the 4th resistance access described the
Four high guaily unit unit；The four high guaily unit unit is respectively through described in first output resistance and second output resistance access
Signal reads main body circuit；First chopper is connected with the output end of the four high guaily unit unit, and through the 4th fortune
Put the input terminal that the feedback resistance in unit accesses the four high guaily unit unit；The ripple cancellation loop RRL circuit connection in
The four high guaily unit unit both ends.
4. a kind of reading circuit applied to Hall current sensor according to claim 3, which is characterized in that described
Four high guaily unit unit further includes one second chopper.
5. a kind of reading circuit applied to Hall current sensor according to claim 3, which is characterized in that the line
Wave cancellation loop RRL circuit include: the 5th resistance, the 6th resistance, third chopper, the 5th amplifier unit, the first inductive reactance,
Second inductive reactance, first capacitor and the second capacitor；One end of 5th resistance and one end point of the 6th resistance
The input terminal of the four high guaily unit unit is not accessed；The other end of 5th resistance and the other end of the 6th resistance connect respectively
Enter the input terminal of the 5th amplifier unit；One end of the first capacitor and one end of the second capacitor are respectively connected to described
The other end of the input terminal of five amplifier units, the other end of the first capacitor and the second capacitor is respectively connected to the 5th fortune
Put the output end of unit；The third chopper is connected with the output end of the 5th amplifier unit；The third chopper point
The output end of the four high guaily unit unit is not accessed through an inductive reactance and second inductive reactance.
6. a kind of reading circuit applied to Hall current sensor according to claim 3, which is characterized in that described
One amplifier unit, the second amplifier unit, the third amplifier unit, that the four high guaily unit unit is all made of Class-A is defeated
Fully differential two-stage telescopic OPAMP out.
7. a kind of reading circuit applied to Hall current sensor according to claim 1, which is characterized in that the letter
Number read main body circuit include one the 6th amplifier unit.
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| CN201820467653.4U CN208190611U (en) | 2018-03-30 | 2018-03-30 | Reading circuit applied to Hall current sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110488082A (en) * | 2019-07-12 | 2019-11-22 | 宁波中车时代传感技术有限公司 | A kind of measure voltage & current chip of integrated numeral output |
| CN111879993A (en) * | 2020-08-14 | 2020-11-03 | 江苏兴宙微电子有限公司 | Current sensor, preparation method thereof and processing method of input signal |
| CN117538590A (en) * | 2023-11-16 | 2024-02-09 | 浙江森尼克半导体有限公司 | Hall sensor circuit and electronic equipment |
-
2018
- 2018-03-30 CN CN201820467653.4U patent/CN208190611U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110488082A (en) * | 2019-07-12 | 2019-11-22 | 宁波中车时代传感技术有限公司 | A kind of measure voltage & current chip of integrated numeral output |
| CN111879993A (en) * | 2020-08-14 | 2020-11-03 | 江苏兴宙微电子有限公司 | Current sensor, preparation method thereof and processing method of input signal |
| CN117538590A (en) * | 2023-11-16 | 2024-02-09 | 浙江森尼克半导体有限公司 | Hall sensor circuit and electronic equipment |
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