CN107994870A - A kind of temperature drift compensating circuit and RC oscillator - Google Patents
A kind of temperature drift compensating circuit and RC oscillator Download PDFInfo
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- CN107994870A CN107994870A CN201711445066.1A CN201711445066A CN107994870A CN 107994870 A CN107994870 A CN 107994870A CN 201711445066 A CN201711445066 A CN 201711445066A CN 107994870 A CN107994870 A CN 107994870A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/02—Details
- H03B5/04—Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/20—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator
Abstract
The application, which provides a kind of temperature drift compensating circuit and RC oscillators, temperature drift compensating circuit, to be included：Temperature detector, for exporting the real-time voltage value to match with the temperature of objective circuit；The straight line compensation circuit and discrete compensation circuit being connected with the temperature sampler；When the straight line compensation circuit is used for the temperature of the target detection resistance in the 3rd fiducial temperature to the second fiducial temperature, the current compensation of example change proportional with the temperature of target detection resistance is provided objective circuit, and the 3rd fiducial temperature is less than the second fiducial temperature；When the temperature that the discrete type compensation circuit is used for the target detection resistance is less than the 3rd fiducial temperature or more than the second fiducial temperature, provide objective circuit size current compensation in parabolic variation.So as to ensure that the stability of objective circuit output.
Description
Technical field
The present invention relates to electronic circuit technology field, and in particular to a kind of temperature for being used to carry out objective circuit temperature-compensating
Spend drift compensating circuit and RC oscillators.
Background technology
RC oscillators are one of most common electronic components in electronic circuit, and the circuit diagram of RC oscillators is as shown in Figure 1, RC
The frequency Fclock of oscillator depends primarily upon the product of Rref and Cint, as shown in formula (1) and formula (2), wherein, Iint
For integration current, Iref is reference current.
Fclock=(Iint/Iref)/(Rref*Cint) (1)
1/Fclock=(Iref/Iint) * (Rref*Cint) (2)
The general temperatures coefficient of capacitance Cint in circuit are preferable, and the temperature coefficient of resistance Rref is poor, thus cause to shake
Swing device output frequency vary with temperature it is very big.The temperature drift of resistance is related to the manufacture craft of circuit, generally once item
Type (linear pattern), quadratic term type (parabola shaped) and multiple item type, as shown in formula (3), T is temperature, k1, k2 ..., and kn is
Temperature coefficient, T0, T1 ..., Tn-1 are thermal constant, and R0 is resistance constant.
R (T)=R0* (1+k1* (T-T0)+k2* (T-T1) 2+ ...+kn* (T-Tn-1) n) (3)
The Fclock temperature drifts of general circuit technique are mostly the linear pattern shown in Fig. 2, also there is a small amount of throwing as shown in Figure 3
Thing line style, F0 are the oscillator frequency at a temperature of T0.According to formula (1) and (3), temperature change, directly affects and vibrates
The frequency Fclock changes of device, for a height, accurately oscillator frequency is very unfavorable for this, particularly in linear motor
Drive area.
The output of parabolic type temperature drift circuit is complicated, how to ensure the stability of circuit output frequency, becomes ability
One of field technique personnel technical problem urgently to be resolved hurrily.
The content of the invention
In view of this, the embodiment of the present invention provides a kind of temperature drift compensating circuit and RC oscillators, to realize electronics electricity
Road can stablize the purpose of output.
To achieve the above object, the embodiment of the present invention provides following technical solution：
A kind of temperature drift compensating circuit, including：
Temperature detector, for exporting the real-time voltage value to match with the temperature of objective circuit；
The straight line compensation circuit and discrete compensation circuit being connected with the temperature sampler；
The temperature that the straight line compensation circuit is used for the target detection resistance is the 3rd fiducial temperature to the second benchmark temperature
When in degree, the current compensation of example change proportional with the temperature of target detection resistance, the 3rd benchmark are provided objective circuit
Temperature is less than the second fiducial temperature；
The temperature that the discrete type compensation circuit is used for the target detection resistance is less than the 3rd fiducial temperature or is more than
During the second fiducial temperature, provide objective circuit size current compensation in parabolic variation.
Preferably, in above-mentioned temperature drift compensating circuit, the linear pattern compensation circuit includes：
The first operational amplifier and the second operational amplifier being connected with the output terminal of the temperature detector；
The in-phase input end of first operational amplifier and the inverting input of the second operational amplifier are used to inputting the
One reference voltage, the inverting input of first operational amplifier and the in-phase input end of the second operational amplifier and the temperature
The output terminal of degree detector is connected, and first reference voltage is that the temperature detector in objective circuit temperature is the first benchmark
The magnitude of voltage exported during temperature；
The positive straight line compensating current element being connected with the output terminal of first operational amplifier, the positive straight line compensation electric current
Source be used for when the temperature of objective circuit is more than the first fiducial temperature, less than the second fiducial temperature when output with the objective circuit
The electric current that temperature matches；
The negative straight line compensating current element being connected with the output terminal of second operational amplifier, the negative straight line compensation electric current
Source be used for when the temperature of objective circuit is more than the 3rd fiducial temperature, less than the first fiducial temperature when output with the objective circuit
The electric current that temperature matches；
The positive straight line compensating current element and the output terminal of negative straight line compensating current element and the compensation electric current of objective circuit are defeated
Enter end to be connected.
Preferably, in above-mentioned temperature drift compensating circuit, be configured with the positive straight line compensating current element the first controller,
Multiple electron current sources and with the one-to-one controlling switch in electron current source；
The output terminal in the electron current source is connected to the defeated of the positive straight line compensating current element by corresponding controlling switch
Outlet；
First controller is used for the output voltage for obtaining first operational amplifier, when the temperature of objective circuit is big
In the first fiducial temperature, less than the second fiducial temperature when, according to objective circuit each controlling switch of temperature control conducting shape
State, so that the output current and the temperature of the objective circuit of the positive straight line compensating current element match.
Preferably, in above-mentioned temperature drift compensating circuit, first controller is specifically used for：
The output voltage of the first operational amplifier is obtained, when the output voltage by first operational amplifier detects
The temperature of objective circuit is more than the first fiducial temperature, less than the second fiducial temperature when, control with for characterizing objective circuit temperature
The first operational amplifier the corresponding controlling switch conducting in one or more electron current sources for matching of output voltage so that
The positive straight line compensating current element output current is as the output voltage of first arithmetic device increases and increases.
Preferably, in above-mentioned temperature drift compensating circuit, be configured with the negative straight line compensating current element second controller,
Multiple electron current sources and with the one-to-one controlling switch in electron current source；
The output terminal in the electron current source is connected to the defeated of the negative straight line compensating current element by corresponding controlling switch
Outlet；
The second controller is used for the output voltage for obtaining second operational amplifier, when the temperature of objective circuit is big
In the 3rd fiducial temperature, less than the first fiducial temperature when, according to objective circuit each controlling switch of temperature control conducting shape
State, so that the output current of the negative straight line compensating current element and the output voltage of second operational amplifier match.
Preferably, in above-mentioned temperature drift compensating circuit, the second controller is specifically used for：
The output voltage of the second operational amplifier is obtained, when the output voltage by second operational amplifier detects
The temperature of objective circuit is more than the 3rd fiducial temperature, less than the first fiducial temperature when, control with for characterizing the temperature of objective circuit
The corresponding controlling switch conducting in one or more electron current sources that the output voltage of the second arithmetic device matches is spent, so that
The negative straight line compensating current element output current is as the output voltage of second arithmetic device reduces and reduces.
Preferably, in above-mentioned temperature drift compensating circuit, discrete compensation circuit includes：
The first comparator being connected with the output terminal of the temperature detector and the second comparator；
The in-phase input end of the first comparator be used for input the second reference voltage, second comparator it is anti-phase defeated
Enter the 3rd reference voltage of end, the in-phase input end and the temperature of the inverting input of the first comparator and the second comparator
The output terminal of detector is connected, and second reference voltage is that the temperature detector in objective circuit temperature is the second benchmark temperature
The magnitude of voltage exported when spending, the 3rd reference voltage are that the temperature detector in objective circuit temperature is the 3rd fiducial temperature
When the magnitude of voltage that exports；
The just discrete compensating current element being connected with the output terminal of the first comparator, the just discrete compensating current element are used
In when the temperature of objective circuit is more than the second fiducial temperature, the electric current to match with the temperature of the objective circuit is exported；
The negative discrete compensating current element being connected with the output terminal of second comparator, the negative discrete compensating current element are used
In when the temperature of objective circuit is less than three fiducial temperatures, the electric current to match with the temperature of the objective circuit is exported；
The compensation electric current of the output terminal and objective circuit of the just discrete compensating current element and negative discrete compensating current element is defeated
Enter end to be connected.
Preferably, in above-mentioned temperature drift compensating circuit, be configured with the just discrete compensating current element the 3rd controller,
First total control switch, multiple electron current sources and with the electron current source sub- controlling switch correspondingly；
The output terminal in the electron current source is connected to the first end of the total control switch by corresponding controlling switch；
The second end of the total control switch is connected with the output terminal of the just discrete compensating current element；
The control terminal of the total control switch is connected with the output terminal of the 3rd controller；
3rd controller is used for when detecting the trigger signal of the first comparator output, according to the target
The conducting state of each controlling switch of temperature control of circuit, so that the output current of the just discrete compensating current element and institute
The temperature for stating objective circuit matches.
Preferably, it is described so that the output electricity of the just discrete compensating current element in above-mentioned temperature drift compensating circuit
Flow and match with the temperature of the objective circuit, be specially：
So that the output current of the just discrete compensating current element follows the temperature of the objective circuit parabolically to become
Change；
Wherein, the output current of the more high just discrete compensating current element of the temperature of objective circuit is higher.
Preferably, in above-mentioned temperature drift compensating circuit, it is described bear discrete compensating current element in be configured with the 4th controller,
Second total control switch, multiple electron current sources and with the electron current source sub- controlling switch correspondingly；
The output terminal in the electron current source is connected to the first end of the total control switch by corresponding controlling switch；
The second end of the total control switch is connected with the output terminal of the just discrete compensating current element；
The control terminal of the total control switch is connected with the output terminal of the 4th controller；
4th controller is used for when detecting the trigger signal of the second comparator output, according to the target
The conducting state of each controlling switch of temperature control of circuit, so that the output current of the just discrete compensating current element and institute
The temperature for stating objective circuit matches.
Preferably, in above-mentioned temperature drift compensating circuit so that the output current of the just discrete compensating current element with
The temperature of the objective circuit matches, and is specially：
So that the output current for bearing discrete compensating current element follows the temperature of the objective circuit parabolically to become
Change；
Wherein, the output current of the higher discrete compensating current element of translation of the temperature of objective circuit is lower.
A kind of RC oscillators, including the temperature drift compensating circuit described in above-mentioned any one.
Based on above-mentioned technical proposal, in such scheme provided in an embodiment of the present invention, the temperature according to objective circuit is different,
Current compensation is carried out to objective circuit using different compensation circuits, when the temperature of the objective circuit is arrived in the 3rd fiducial temperature
When within the second warm reference temperature range, current compensation is carried out to the objective circuit using straight line compensation circuit, when the mesh
When marking the temperature of circuit less than the 3rd fiducial temperature or more than the second fiducial temperature, using the discrete type compensation circuit to described
Objective circuit carries out current compensation.As it can be seen that in such scheme, the temperature according to objective circuit is different, using different temperature
Compensation scheme carries out current compensation to objective circuit, so as to ensure that the stability of objective circuit output.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the structure diagram of RC oscillators in the prior art；
Fig. 2 is the output diagram of linear pattern temperature drift circuit；
Fig. 3 is that the output of parabolic type temperature drift circuit is illustrated；
Fig. 4 is a kind of temperature drift compensating circuit structure diagram disclosed in the embodiment of the present application；
Fig. 5 is a kind of straight line compensation circuit structure diagram disclosed in the embodiment of the present application；
Fig. 6 is schematic diagram of the temperature detector output with objective circuit temperature change；
Fig. 7 is schematic diagram of the operational amplifier with temperature output with objective circuit temperature change；
Fig. 8 is the compensation electric current of straight line compensation circuit output with the schematic diagram of objective circuit temperature change；
Fig. 9 is schematic diagram of the Continuous Compensation frequency with objective circuit temperature change；
Figure 10 is a kind of discrete compensation circuit structure diagram disclosed in the embodiment of the present application；
Figure 11 is RC oscillator discrete temperature compensation effect figures；
Figure 12 is the combination temp drift compensation design sketch of RC oscillators.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
Present invention employs two kinds of temperature drift compensation modes to solve the resistance temperature of parabolic type temperature drift circuit
Drifting problem, the first uses continuous type straight line temperature-compensating (ITC), and second using discrete type temperature-compensating (ITD).This two
Kind compensation way combination, can be with the linear pattern temperature drift of compensated oscillator frequency, parabolic type temperature drift and multiple item type
Temperature drift.
Specifically, referring to Fig. 4, temperature drift compensating circuit can specifically include disclosed in the embodiment of the present application：
Temperature detector 100, for exporting the real-time voltage value to match with the temperature of objective circuit, wherein in test mesh
When marking the temperature of circuit, the temperature of objective circuit can be characterized by compensating the temperature of resistance in objective circuit, naturally it is also possible to
The dimension of the temperature objectives circuit is characterized by the temperature of other devices such as compensating electric capacity, comparator in objective circuit；
The straight line compensation circuit 200 and discrete compensation circuit 300 being connected with the temperature sampler 100；
The temperature that the straight line compensation circuit 200 is used for the target detection resistance is the 3rd fiducial temperature TN to the second base
When in quasi- temperature TP, the current compensation of example change proportional with the temperature of target detection resistance provided objective circuit, described the
Three fiducial temperature TN are less than the second fiducial temperature, wherein, the ratio of above-mentioned direct proportion change is according to user demand sets itself；
The temperature that the discrete type compensation circuit 300 is used for the target detection resistance be less than the 3rd fiducial temperature TN or
During more than the second fiducial temperature TP, provide objective circuit size current compensation in parabolic variation.
In technical solution disclosed in the above embodiments of the present application, the temperature according to objective circuit is different, using different
Compensation circuit carries out current compensation to objective circuit, when the temperature of the objective circuit is in the 3rd fiducial temperature to the second warm benchmark
When within temperature range, current compensation is carried out to the objective circuit using straight line compensation circuit, when the temperature of the objective circuit
Degree less than the 3rd fiducial temperature or during more than the second fiducial temperature, using the discrete type compensation circuit to the objective circuit into
Row current compensation.As it can be seen that in such scheme, the temperature according to objective circuit is different, using different compensation schemes pair
Objective circuit carries out current compensation, so as to ensure that the stability of objective circuit output.
Preferably, in technical solution disclosed in above-described embodiment, referring to Fig. 5, the linear pattern compensation circuit 200 is wrapped
Include：
The the first operational amplifier U1 and the second operational amplifier U2 being connected with the output terminal of the temperature detection 100；
The in-phase input end of the first operational amplifier U1 and the inverting input of the second operational amplifier U2 are used for defeated
Enter the first reference voltage V T0, the first operational amplifier U1 inverting input and the second operational amplifier U2 it is same mutually defeated
Enter end with the output terminal of the temperature detector 100 to be connected, the first reference voltage V T0 exists for the temperature detector 100
The magnitude of voltage that objective circuit temperature exports when being the first fiducial temperature T0；
The positive straight line compensating current element 210 being connected with the output terminal of the first operational amplifier U1, the positive straight line are mended
Repay current source 210 be used for when objective circuit temperature be more than the first fiducial temperature T0, less than the second fiducial temperature TP when output with
The electric current ITCP that the temperature of the objective circuit matches；
The negative straight line compensating current element 220 being connected with the output terminal of the second operational amplifier U2, the negative straight line are mended
Repay current source 220 be used for when objective circuit temperature be more than the 3rd fiducial temperature TN, less than the first fiducial temperature T0 when output with
The electric current ITCN that the temperature of the objective circuit matches；
The compensation of the output terminal and objective circuit of the positive straight line compensating current element 210 and negative straight line compensating current element 220
Current input terminal is connected.
When the straight line compensation circuit 200 works, the temperature detector 100 is shown in Figure 6 with temperature exporting change,
Its output voltage is according to certain slope as the temperature of objective circuit raises and reduces, the first operational amplifier U1 and second
The output of operational amplifier U2 is shown in Figure 7 with the change of objective circuit, wherein, the output of the first operational amplifier U1
As the temperature of objective circuit is raised with the increase of certain slope, the output of the second operational amplifier U2 is with objective circuit
Temperature rise is reduced with certain slope.When the temperature of objective circuit changes in the 3rd fiducial temperature and the second fiducial temperature,
The compensation curent change that the straight line compensation circuit 200 exports may refer to shown in Fig. 7, and positive straight line compensating current element 210 exports
Compensation electric current increased as the temperature of objective circuit increases with certain slope, bear the compensation of the output of straight line compensating current element 220
Electric current is reduced as the temperature of objective circuit increases with certain slope.When the objective circuit is RC oscillators, as the RC
When objective circuit in oscillator changes in the 3rd fiducial temperature to the second fiducial temperature, mended in the RC oscillators in straight line
Under the conciliation for repaying circuit 200, its output may refer to shown in Fig. 8.
Referring to Fig. 5, in technical solution disclosed in the embodiment of the present application, configuration in the positive straight line compensating current element 210
Have the first controller (not shown), multiple electron current source ITCP and with the one-to-one controlling switch P in the electron current source；
The output terminal of the electron current source ITCP is connected to the positive straight line compensating current element by corresponding controlling switch P
Output terminal；
First controller is used for the output voltage for obtaining the first operational amplifier U1, when the temperature of objective circuit
More than the first fiducial temperature T0, less than the second fiducial temperature TP when, temperature control each controlling switch P according to objective circuit
Conducting state, so that the output current and the temperature of the objective circuit of the positive straight line compensating current element match.
Wherein, in any one scheme disclosed in the embodiment of the present application, the multiple electron current source also refers to multiple
The identical current source of output current size or multiple output currents current source of different sizes, it is of course also possible to be defeated
Go out the n current source that size of current is distributed with equal proportion, for example, the ratio can be 2.
In technical solution disclosed in the embodiment of the present application, first controller is used to control positive straight line compensating current element
210 output size, if its ensure objective circuit temperature be more than the first fiducial temperature T0, less than the second fiducial temperature TP when
The electric current for controlling the temperature level of the positive output of straight line compensating current element 210 and objective circuit to match, the temperature of objective circuit
Mapping relations between the output size of degree and positive straight line compensating current element 210 can be obtained by default mapping table, or default
Mapping relations obtain.First controller is by controlling the conducting state with each controlling switch, you can by controlling more height
One or more of current source electron current source is in output state, so as to may be such that honest line compensating current element 210 exports
Required compensation electric current.Specifically：First controller is used for：
The output voltage of first operational amplifier U1 is used to characterize objective circuit temperature, obtains the first operational amplifier U1's
Output voltage, when the output voltage by the first operational amplifier U1 detects that the temperature of objective circuit is more than the first benchmark
Temperature T0, less than the second fiducial temperature TP when, one or more that control matches with the output voltage of the first operational amplifier
The corresponding controlling switch conducting in electron current source, so that the positive straight line compensating current element output current is with first arithmetic device
Output voltage increases and increases.
It is similar with above-mentioned positive straight line compensating current element, it is configured with second controller (not in the negative straight line compensating current element
Show), multiple electron current source ITCN and with the one-to-one controlling switch N of the electron current source ITCN；
The output terminal of the electron current source ITCN of configuration is connected by corresponding controlling switch N in the negative straight line compensating current element
It is connected to the output terminal of the negative straight line compensating current element 220；
The second controller is used for the output voltage for obtaining second operational amplifier, when the temperature of objective circuit is big
In the 3rd fiducial temperature TN, less than the first fiducial temperature T0 when, temperature control each controlling switch according to objective circuit is led
Logical state, by way of controlling wherein one or more controlling switches to turn on so that the negative straight line compensating current element it is defeated
The output voltage for going out electric current and second operational amplifier matches, referring to Fig. 7, as the rise of objective circuit temperature is born directly
The output of line compensating current element is declined with certain slope.
Corresponding, the second controller is specifically used for：
The output voltage of second operational amplifier U2 is used to characterize objective circuit temperature, obtains the defeated of the second operational amplifier
Go out voltage, when the output voltage by second operational amplifier detects that the temperature of objective circuit is more than the 3rd fiducial temperature
TN, less than the first fiducial temperature T0 when, one or more son electricity that control matches with the output voltage of the second arithmetic device
The corresponding controlling switch conducting in stream source, so that the negative straight line compensating current element output current is with the output of second arithmetic device
Voltage reduces and reduces.
In technical solution disclosed in above-described embodiment, the straight line compensation circuit 200 is continuous type straight line temperature-compensating
(ITC) circuit, its frame structure is as shown in figure 5, wherein, the first reference voltage V T0 is that the temperature of objective circuit is the first benchmark
The output voltage of temperature detector 100 during temperature T0, VTCP and VTCN are respectively the first operational amplifier U1 and the second computing
The positive and negative offset voltage of amplifier U2 outputs, ITCP and ITCN are respectively sub- power supply presented hereinabove, its type is voltage-controlled electricity
Stream source, ITCP and ITCN are respectively positive and negative straight line compensation electric current, by the conducting controllable quantity system for controlling controlling switch P and N
The change slope of positive and negative straight line compensation electric current.
The output of temperature detector and operational amplifier is varied with temperature shown in curve below figure 6 and Fig. 7, temperature detector
Voltage output reduced with the rise of temperature, the temperature of operational amplifier is exported since T0, and VTCP is raised and risen with temperature
Height, VTCN are raised and reduced with temperature；Continuous Compensation electric current ITC varies with temperature curve as shown in figure 8, working as the objective circuit
For RC oscillators when, Continuous Compensation frequency FTC varies with temperature curve as shown in figure 9, since T0, and ITCP and FTCP are with temperature
Raise and raise, ITCN and FTCN are raised and reduced with temperature.
By two operational amplifiers, amplify the detection voltage of temperature detector, the output based on the operational amplifier
The output of positive and negative voltage-controlled current source ITCP and ITCN is controlled respectively, and starting compensation temperature can be controlled by VT0, pass through control
The conducting state of each controlling switch P and N is made to control the change slope of compensation electric current ITC, is finally reached any slope of compensation
Two sections of temperature-compensatings.When the objective circuit is RC oscillators, if the output Fclock of oscillator with temperature increase and
Increase, then only need to open controlling switch N, specific number needs to be selected according to the temperature slope of Fclock；If Fclock with
Temperature increases and reduces, then only needs to open controlling switch P, specific number needs to be selected according to the temperature slope of Fclock.
In technical solution disclosed in the embodiment of the present application, objective circuit temperature is in the 3rd fiducial temperature to the second benchmark temperature
In the range of degree, compensation electric current ITC can the perfect linear pattern temperature drift for compensating objective circuit；Can also be to parabolic type and more
Secondary item type temperature drift carries out portion temperature compensation, and still, when temperature departure T0 is larger, compensation effect is poor, at this time can group
Discrete temperature drift compensation ITD is used in conjunction.
In such scheme disclosed in the present embodiment, discrete temperature drift compensation can be realized using discrete compensation circuit,
Referring to Figure 10, discrete compensation circuit 300 includes：
The first comparator U3 and the second comparator U4 being connected with the output terminal of the temperature detection 100；
The in-phase input end of the first comparator U3 is used to input the second reference voltage V TP, the second comparator U4
The 3rd reference voltage V TN of inverting input, the same phase of the inverting input of the first comparator U3 and the second comparator U4
Input terminal is connected with the output terminal of the temperature detector 100, and the second reference voltage V TP is the temperature detector 100
The magnitude of voltage exported when objective circuit temperature is the second fiducial temperature TP, the 3rd reference voltage V TN examine for the temperature
Survey the magnitude of voltage that device is exported when objective circuit temperature is the 3rd fiducial temperature TN；
The just discrete compensating current element 310 being connected with the output terminal of the first comparator U3, the just discrete compensation electricity
Stream source 310 is used for when the temperature of objective circuit is more than the second fiducial temperature TP, exports the temperature phase with the objective circuit
The electric current matched somebody with somebody；
The negative discrete compensating current element 320 being connected with the output terminal of the second comparator U4, the negative discrete compensation electricity
Stream source is used for when the temperature of objective circuit is less than the 3rd fiducial temperature TN, exports what is matched with the temperature of the objective circuit
Electric current；
The compensation of the output terminal and objective circuit of the just discrete compensating current element 310 and negative discrete compensating current element 320
Current input terminal is connected.
In such scheme, the first comparator U3 and the second comparator U4 monitor the temperature detector 100 in real time
Output valve, when the output valve for detecting temperature detector is more than second reference voltage, the first comparator U3 is defeated
Go out control signal to control the just discrete compensating current element 310 to work so that just discrete compensating current element 310 output with
The current signal that the Current Temperatures of objective circuit match, when the output valve for detecting temperature detector is less than the 3rd benchmark
During voltage, the second comparator U4 output control signals with control it is described bear discrete compensating current element 320 work so that it is described
The current signal that the Current Temperatures of the negative discrete output of compensating current element 320 and objective circuit match.
In the application such scheme, also disclose a kind of just discrete compensating current element 310 and bear discrete compensating current element 320
Concrete structure.
Wherein, the 3rd controller (not shown), the first total control switch are configured with the just discrete compensating current element 310
DP, multiple electron current sources and with the electron current source sub- controlling switch PD correspondingly；
The output terminal in the electron current source is connected to the first of the total control switch DP by corresponding controlling switch PD
End；
The second end of the total control switch DP is connected with the output terminal of the just discrete compensating current element 310, for controlling
The output state of the just discrete compensating current element 310 of system；
The control terminal of the total control switch DP is connected with the output terminal of the 3rd controller；
3rd controller is used for when detecting the trigger signal of the first comparator U3 outputs, according to the mesh
The conducting state of each controlling switch PD of temperature control of circuit is marked, so that the output of the just discrete compensating current element 310
The temperature of electric current and the objective circuit matches, specifically, can by controlling the conducting state of each controlling switch PD, with
So that the temperature of the compensation current following objective circuit of just discrete compensating current element 310 is raised and raised, and just discrete compensation
The variation tendency parabolically shape of the compensation electric current of current source 310.
Similar, described bear is configured with the 4th controller, the second total control switch DN, more in discrete compensating current element 320
A sub- current source and with the electron current source sub- controlling switch ND correspondingly；
The output terminal in the electron current source connects the first end that ND is connected to the total control switch by corresponding controlling switch；
The second end of the total control switch DN is connected with the output terminal of the just discrete compensating current element 320；
The control terminal of the total control switch DN is connected with the output terminal of the 4th controller；
4th controller is used for when detecting the trigger signal of the second comparator U4 outputs, according to the mesh
Mark circuit each controlling switch of temperature control conducting state so that the output current of the just discrete compensating current element with
The temperature of the objective circuit matches.Specifically, so that the output current for bearing discrete compensating current element follows the mesh
The temperature for marking circuit is in parabolic variation；Wherein, the output current of the higher discrete compensating current element of translation of the temperature of objective circuit
It is lower.
In technical solution disclosed in the above embodiments of the present application, electron current source, control in each compensating current element are opened
Pass can share, naturally it is also possible to independently of each other.
Specifically, discrete temperature drift compensation (ITD) is as shown in Figure 10.Second reference voltage V (TP) is objective circuit temperature
Spend for the second fiducial temperature TP when temperature detector output voltage, the 3rd reference voltage V (TN) is that objective circuit temperature is
The output voltage of temperature detector during three fiducial temperatures, VTDP and VTDN are respectively that comparator is exported to total control switch
Trigger signal, ITDP and ITDN are respectively current source, and ITDP and ITDN are respectively the positive and negative discrete compensation electricity of current source output
Stream, controlling switch PD and ND are used to control positive and negative discrete compensating current element output quantity.
When temperature detector detects that the temperature of objective circuit is more than the second fiducial temperature TP, first comparator to just from
Scattered compensating current element sends trigger signal VTDP, opens total control switch DP, and positive discrete temperature compensation is carried out to objective circuit
ITDP；When temperature detector detects that the temperature of objective circuit is less than the 3rd fiducial temperature TN, the second comparator is discrete to bearing
Compensating current element sends trigger signal VTDN, opens total control switch DN, and negative discrete temperature compensation ITDN is carried out to objective circuit.
The compensation rate of discrete temperature is controlled by the conducting quantity of controlling switch DP and controlling switch DN.
When objective circuit is RC oscillating circuits, discrete temperature compensation (ITD) effect is as shown in figure 11, when temperature is more than the
FTDP is compensated during two fiducial temperature TP, compensation rate is by switch PD control；When temperature is less than the 3rd fiducial temperature TN, compensation
FTDN, compensation rate are controlled by controlling switch ND.
Combination temp drift compensation effect is as shown in figure 12, and objective circuit temperature is in the benchmark of the 3rd fiducial temperature TN~second
When between temperature TP temperature, temperature-compensating is carried out to objective circuit by straight line compensation circuit；When temperature exceeds TN~TP scopes, by
Discrete compensation circuit carries out temperature-compensating to objective circuit.When objective circuit is oscillator, the error of compensation can be controlled in ± δ
Within.δ depends on the frequency range before oscillator temperature compensation, can when the excursion of δ is -40~85 scope
Realize within oscillator error ± 0.5%.
Apply to there is above-mentioned any one temperature to float disclosed herein as well is one kind corresponding to above-mentioned temperature drift compensating circuit
Move the RC oscillating circuits of compensation circuit.
For convenience of description, it is divided into various modules during description system above with function to describe respectively.Certainly, this is being implemented
The function of each module can be realized in same or multiple softwares and/or hardware during application.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Divide mutually referring to what each embodiment stressed is the difference with other embodiment.Especially for system or
For system embodiment, since it is substantially similar to embodiment of the method, so describing fairly simple, related part is referring to method
The part explanation of embodiment.System and system embodiment described above is only schematical, wherein the conduct
The unit that separating component illustrates may or may not be it is physically separate, can be as the component that unit is shown or
Person may not be physical location, you can with positioned at a place, or can also be distributed in multiple network unit.Can root
Factually border needs to select some or all of module therein realize the purpose of this embodiment scheme.Ordinary skill
Personnel are without creative efforts, you can to understand and implement.
Professional further appreciates that, with reference to each exemplary unit of the embodiments described herein description
And algorithm steps, can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software, generally describes each exemplary composition and step according to function in the above description.These
Function is performed with hardware or software mode actually, application-specific and design constraint depending on technical solution.Specialty
Technical staff can realize described function to each specific application using distinct methods, but this realization should not
Think beyond the scope of this invention.
Can directly it be held with reference to the step of method or algorithm that the embodiments described herein describes with hardware, processor
Capable software module, or the two combination are implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only will including those
Element, but also including other elements that are not explicitly listed, or further include as this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there are other identical element in process, method, article or equipment including the key element.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide scope caused.
Claims (12)
- A kind of 1. temperature drift compensating circuit, it is characterised in that including：Temperature detector, for exporting the real-time voltage value to match with the temperature of objective circuit；The straight line compensation circuit and discrete compensation circuit being connected with the temperature sampler；The straight line compensation circuit is used for the temperature of the target detection resistance in the 3rd fiducial temperature to the second fiducial temperature When, the current compensation changed with the proportional example of the temperature of target detection resistance, the 3rd fiducial temperature are provided objective circuit Less than the second fiducial temperature；The temperature that the discrete type compensation circuit is used for the target detection resistance is less than the 3rd fiducial temperature or more than second During fiducial temperature, provide objective circuit size current compensation in parabolic variation.
- 2. temperature drift compensating circuit according to claim 1, it is characterised in that the linear pattern compensation circuit includes：The first operational amplifier and the second operational amplifier being connected with the output terminal of the temperature detector；The in-phase input end of first operational amplifier and the inverting input of the second operational amplifier are used to input the first base Quasi- voltage, the inverting input of first operational amplifier and the in-phase input end of the second operational amplifier are examined with the temperature The output terminal for surveying device is connected, and first reference voltage is that the temperature detector in objective circuit temperature is the first fiducial temperature When the magnitude of voltage that exports；The positive straight line compensating current element being connected with the output terminal of first operational amplifier, the positive straight line compensating current element are used In when the temperature of objective circuit is more than the first fiducial temperature, less than the second fiducial temperature when the output and temperature of the objective circuit The electric current to match；The negative straight line compensating current element being connected with the output terminal of second operational amplifier, the negative straight line compensating current element are used In when the temperature of objective circuit is more than the 3rd fiducial temperature, less than the first fiducial temperature when the output and temperature of the objective circuit The electric current to match；The positive straight line compensating current element and the output terminal of negative straight line compensating current element and the compensation current input terminal of objective circuit It is connected.
- 3. temperature drift compensating circuit according to claim 2, it is characterised in that match somebody with somebody in the positive straight line compensating current element Be equipped with the first controller, multiple electron current sources and with the one-to-one controlling switch in electron current source；The output terminal in the electron current source is connected to the output terminal of the positive straight line compensating current element by corresponding controlling switch；First controller is used to obtain the output voltage of first operational amplifier, when the temperature of objective circuit is more than the One fiducial temperature, less than the second fiducial temperature when, according to objective circuit each controlling switch of temperature control conducting state, with So that the output current and the temperature of the objective circuit of the positive straight line compensating current element match.
- 4. temperature drift compensating circuit according to claim 3, it is characterised in that first controller is specifically used for：The output voltage of the first operational amplifier is obtained, when the output voltage by first operational amplifier detects target The temperature of circuit is more than the first fiducial temperature, less than the second fiducial temperature when, control with for characterizing the of objective circuit temperature The corresponding controlling switch conducting in one or more electron current sources that the output voltage of one operational amplifier matches, so that described Positive straight line compensating current element output current is as the output voltage of first arithmetic device increases and increases.
- 5. temperature drift compensating circuit according to claim 2, it is characterised in that match somebody with somebody in the negative straight line compensating current element Be equipped with second controller, multiple electron current sources and with the one-to-one controlling switch in electron current source；The output terminal in the electron current source is connected to the output terminal of the negative straight line compensating current element by corresponding controlling switch；The second controller is used to obtain the output voltage of second operational amplifier, when the temperature of objective circuit is more than the Three fiducial temperatures, less than the first fiducial temperature when, according to objective circuit each controlling switch of temperature control conducting state, with So that the output current and the output voltage of second operational amplifier of the negative straight line compensating current element match.
- 6. temperature drift compensating circuit according to claim 5, it is characterised in that the second controller is specifically used for：The output voltage of the second operational amplifier is obtained, when the output voltage by second operational amplifier detects target The temperature of circuit is more than the 3rd fiducial temperature, less than the first fiducial temperature when, control with for characterizing the temperature institute of objective circuit The corresponding controlling switch conducting in one or more electron current sources that the output voltage of second arithmetic device matches is stated, so that described Negative straight line compensating current element output current is as the output voltage of second arithmetic device reduces and reduces.
- 7. temperature drift compensating circuit according to claim 1, it is characterised in that discrete compensation circuit includes：The first comparator being connected with the output terminal of the temperature detector and the second comparator；The in-phase input end of the first comparator is used to input the second reference voltage, the inverting input of second comparator The in-phase input end of 3rd reference voltage, the inverting input of the first comparator and the second comparator and the temperature detection The output terminal of device is connected, and second reference voltage is the temperature detector when objective circuit temperature is the second fiducial temperature The magnitude of voltage of output, the 3rd reference voltage are that the temperature detector is defeated when objective circuit temperature is three fiducial temperature The magnitude of voltage gone out；The just discrete compensating current element being connected with the output terminal of the first comparator, the just discrete compensating current element are used to work as When the temperature of objective circuit is more than the second fiducial temperature, the electric current to match with the temperature of the objective circuit is exported；The negative discrete compensating current element being connected with the output terminal of second comparator, it is described to bear discrete compensating current element for working as When the temperature of objective circuit is less than three fiducial temperatures, the electric current to match with the temperature of the objective circuit is exported；The compensation current input terminal of the output terminal and objective circuit of the just discrete compensating current element and negative discrete compensating current element It is connected.
- 8. temperature drift compensating circuit according to claim 7, it is characterised in that match somebody with somebody in the just discrete compensating current element It is equipped with the 3rd controller, the first total control switch, multiple electron current sources and is controlled with the one-to-one son in the electron current source Switch；The output terminal in the electron current source is connected to the first end of the total control switch by corresponding controlling switch；The second end of the total control switch is connected with the output terminal of the just discrete compensating current element；The control terminal of the total control switch is connected with the output terminal of the 3rd controller；3rd controller is used for when detecting the trigger signal of the first comparator output, according to the objective circuit The each controlling switch of temperature control conducting state so that the output current of the just discrete compensating current element and the mesh The temperature of mark circuit matches.
- 9. temperature drift compensating circuit according to claim 8, it is characterised in that described so that the just discrete compensation The output current of current source and the temperature of the objective circuit match, and are specially：So that the output current of the just discrete compensating current element follows the temperature of the objective circuit in parabolic variation；Wherein, the output current of the more high just discrete compensating current element of the temperature of objective circuit is higher.
- 10. temperature drift compensating circuit according to claim 7, it is characterised in that described to bear in discrete compensating current element It is configured with the 4th controller, the second total control switch, multiple electron current sources and is controlled with the one-to-one son in the electron current source System switch；The output terminal in the electron current source is connected to the first end of the total control switch by corresponding controlling switch；The second end of the total control switch is connected with the output terminal of the just discrete compensating current element；The control terminal of the total control switch is connected with the output terminal of the 4th controller；4th controller is used for when detecting the trigger signal of the second comparator output, according to the objective circuit The each controlling switch of temperature control conducting state so that the output current of the just discrete compensating current element and the mesh The temperature of mark circuit matches.
- 11. temperature drift compensating circuit according to claim 10, it is characterised in that so that the just discrete compensation electricity The output current in stream source and the temperature of the objective circuit match, and are specially：So that the output current for bearing discrete compensating current element follows the temperature of the objective circuit in parabolic variation；Wherein, the output current of the higher discrete compensating current element of translation of the temperature of objective circuit is lower.
- 12. a kind of RC oscillators, it is characterised in that including the temperature drift compensation electricity described in claim 1-11 any one Road.
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| CN201711445066.1A CN107994870A (en) | 2017-12-27 | 2017-12-27 | A kind of temperature drift compensating circuit and RC oscillator |
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| CN201711445066.1A CN107994870A (en) | 2017-12-27 | 2017-12-27 | A kind of temperature drift compensating circuit and RC oscillator |
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Application publication date: 20180504 |