CN105827206B - The complementary oscillator of phase shift - Google Patents
The complementary oscillator of phase shift Download PDFInfo
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- CN105827206B CN105827206B CN201610151657.7A CN201610151657A CN105827206B CN 105827206 B CN105827206 B CN 105827206B CN 201610151657 A CN201610151657 A CN 201610151657A CN 105827206 B CN105827206 B CN 105827206B
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- Prior art keywords
- amplifier
- phase shift
- phase
- reactance component
- shift
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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
- H03B5/24—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 active element in amplifier being semiconductor device
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- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
The present invention relates to field of oscillators, and it discloses a kind of complementary oscillators of phase shift, are made of an amplifier and a phase shift complementation unit；The phase shift complementation unit is two-stage phase-shift network.The beneficial effects of the present invention are: the replacement circuit as classical RC phaseshift oscillator, the phase shift of amplifier and phase shift complementation unit is zero in the entire circuit of the present invention, guarantee that entire circuit becomes positive feedback amplifier with this, the building form of this circuit meets the general requirement of oscillator structure, thus the present invention is the completely new constituted mode of phaseshift oscillator.Since the structure of phase-shift network becomes two-stage from three-level, wherein participating in partial pressure and the resistance shunted and the reduction of reactance component number, therefore the signal magnitude of internal each link has preferable consistency.It is related to two kinds of similar circuit structures, thus derived from physical circuit (referring to alternating current path) altogether there are four.
Description
[technical field]
The present invention relates to field of oscillators more particularly to a kind of complementary oscillators of phase shift.
[background technique]
Basic element circuit of the sine-wave oscillator as electronic circuit realizes with basic the allomeric function of circuit
Status and effect.Classical RC phaseshift oscillator is made of antiphase voltage amplifier and reverse phase RC phase-shift network, this two parts
The phase shift for generating 180 ° respectively, finally makes entire circuit become positive feedback amplifier, obtains sine-wave oscillation.Classical RC phase shift
The phase shift object of oscillator can only be voltage, meanwhile, the structure of classical RC phaseshift oscillator phase-shift network has three-level.
Since the structure of this phase-shift network has three-level, wherein the resistance capacitor device for participating in partial pressure and shunting is excessive, meeting
The signal after phase-shift network is caused to have biggish decaying.Therefore, the signal of each link is big inside classical RC phaseshift oscillator
It is small to be lack of consistency.However, in addition to the RC phaseshift oscillator of this classics, about phaseshift oscillator, so far without other realities
The it is proposed of existing mode.
[summary of the invention]
In order to solve the problems in the prior art, the present invention constructs a kind of completely new complementary oscillator of phase shift.
The present invention is the new implementation of one kind of phaseshift oscillator, compared with classical RC oscillator implementation,
In amplifier either voltage amplifier, is also possible to current amplifier；Wherein the structure of phase-shift network only has two-stage, phase
The reactance component in network is moved either capacitor, is also possible to inductance.
The present invention provides a kind of complementary oscillators of phase shift, are made of an amplifier and a phase shift complementation unit；
The phase shift complementation unit is two-stage phase-shift network.
As a further improvement of the present invention: the two-stage phase-shift network is identical by a resistance and two impedance properties
Reactance component composition；The identical reactance component of described two impedance properties is all capacitor or is all inductance.
As a further improvement of the present invention: in the embodiment of Fig. 1 and Fig. 2, the amplifier is current amplifier, when
The alternating current direction of input terminal is when flowing into amplifier, which is in the obtained alternating current direction of output end
Flow out amplifier.
As a further improvement of the present invention: in the embodiment of Fig. 3 and Fig. 4, the amplifier is voltage amplifier, should
Voltage amplifier is in-phase amplifier.
As a further improvement of the present invention: influence of the two-stage phase-shift network to current or voltage phase has complementation
Property.
As a further improvement of the present invention: phase shift caused by the front and back stages structure in the two-stage phase-shift network is
It is opposite, level-one be it is advanced, in addition level-one is lag, to achieve the purpose that phase shift complementation.
As a further improvement of the present invention: in the embodiment of Fig. 1 and Fig. 2, the identical electricity of described two impedance properties
Anti- element is the first reactance component and the second reactance component；The output end of the amplifier connects the first end of the resistance simultaneously
With the first end of first reactance component；The input terminal of the amplifier connects the second end of first reactance component simultaneously
With the first end of second reactance component；The second end of the resistance and the second end of second reactance component are grounded.
As a further improvement of the present invention: in the embodiment of Fig. 3 and Fig. 4, the identical electricity of described two impedance properties
Anti- element is the first reactance component and the second reactance component；The output end of the amplifier connect with the resistance after again with it is described
The series connection of first reactance component；The second end of first reactance component connects first end and the institute of second reactance component simultaneously
State the input terminal of amplifier；The second end of second reactance component is grounded.
The beneficial effects of the present invention are: the replacement circuit as classical RC phaseshift oscillator, in the entire circuit of the present invention
The phase shift of amplifier and phase shift complementation unit is zero, guarantees that entire circuit becomes positive feedback amplifier with this, this circuit
Building form meets the general requirement of oscillator structure, thus the present invention is the completely new constituted mode of phaseshift oscillator.Due to phase
The structure for moving network becomes two-stage from three-level, wherein participating in partial pressure and the resistance shunted and the reduction of reactance component number, therefore interior
The signal magnitude of each link in portion has preferable consistency.It is related to two kinds of similar circuit structures, thus derivative specific electricity
There are four road (referring to alternating current path) is total.
[Detailed description of the invention]
Fig. 1 is one embodiment of the invention schematic diagram, is the complementary oscillator of current mode RC phase shift；
Fig. 2 is further embodiment of this invention schematic diagram, is the complementary oscillator of current mode RL phase shift；
Fig. 3 is another embodiment of the present invention schematic diagram, is the complementary oscillator of voltage-type RC phase shift；
Fig. 4 is yet another embodiment of the invention schematic diagram, is the complementary oscillator of voltage-type RL phase shift.
[specific embodiment]
With reference to the accompanying drawing and specific embodiment the invention will be further described.
The present invention provides a kind of complementary oscillators of phase shift, are made of an amplifier and a phase shift complementation unit；
The phase shift complementation unit is two-stage phase-shift network.
The two-stage phase-shift network is made of a resistance and the identical reactance component of two impedance properties；Described two electricity
The identical reactance component of resistance matter is all capacitor or is all inductance.
In the embodiment of Fig. 1 and Fig. 2, the amplifier is current amplifier, when the alternating current direction of input terminal is
When flowing into amplifier, which is outflow amplifier in the obtained alternating current direction of output end.
In the embodiment of Fig. 3 and Fig. 4, the amplifier is voltage amplifier, which is in-phase amplifier.
Influence of the two-stage phase-shift network to current or voltage phase has complementarity.
Phase shift caused by front and back stages structure in the two-stage phase-shift network be it is opposite, level-one be it is advanced, in addition
Level-one is lag, to achieve the purpose that phase shift complementation.
In the embodiment of Fig. 1 and Fig. 2, the identical reactance component of described two impedance properties is the first reactance component and the
Two reactance components；The output end of the amplifier connect simultaneously the resistance first end and first reactance component first
End；The input terminal of the amplifier connect simultaneously first reactance component second end and second reactance component first
End；The second end of the resistance and the second end of second reactance component are grounded.
In the embodiment of Fig. 3 and Fig. 4, the identical reactance component of described two impedance properties is the first reactance component and the
Two reactance components；The output end of the amplifier is connected with first reactance component again after connecting with the resistance；Described
The second end of one reactance component connects the first end of second reactance component and the input terminal of the amplifier simultaneously；Described
The second end of two reactance components is grounded.
The present invention gives the completely new constituted modes of phaseshift oscillator, are properly termed as the complementary oscillator of phase shift.Its circuit
There are two types of similar forms for structure, are the complementary oscillator of current mode phase shift and the complementary oscillator of voltage-type phase shift respectively.By
There are four (refer to alternating current path, and realize that the actual circuit of alternating current path is even more multiplicity) altogether for this derivative physical circuit.This is
About a technological improvement of sine-wave oscillator basic structure, practical circuit abundant can be built on this basis.
The constituted mode of phase shift complementation unit (i.e. two-stage phase-shift network): there are two types of constituted modes for phase shift complementation unit, i.e.,
(see the phase shift complementation unit in Fig. 1 and Fig. 2, it is electricity that the difference of two figures is reactance component respectively to current mode phase shift complementation unit
Hold and inductance) and voltage-type phase shift complementation unit (see the phase shift complementation unit in Fig. 3 and Fig. 4, the difference of two figures is reactance element
Part is capacitor and inductance respectively).
Current amplifier and current mode phase shift complementation unit constitute the complementary oscillator of current mode phase shift, it has current mode RC
Two kinds of concrete forms of the complementary oscillator of phase shift (Fig. 1) and the complementary oscillator of current mode RL phase shift (Fig. 2)；Voltage amplifier with
Voltage-type phase shift complementation unit constitutes the complementary oscillator of voltage-type phase shift, it has the complementary oscillator of voltage-type RC phase shift (figure
And two kinds of concrete forms of the complementary oscillator of voltage-type RL phase shift (Fig. 4) 3).
Qualitative analysis:
For meeting the current amplifier of aforementioned currents direction requirement, if output electric current without phase shift fed back to
Input terminal, entire circuit just become positive feedback amplifier, it is possible to realizing sine-wave oscillation.And current mode phase shift is complementary single
Output electric current exactly without phase shift is fed back to input terminal by the function of member.In Fig. 1, phase shift complementation unit both ends electric current i is consideredi
With ioPhase relation.Due to RiWith C2Parallel connection, therefore phase shift complementation unit also includes Ri, it is made of two-stage RC phase-shift network.
RiWith C2Parallel connection constitutes first order phase-shift network, the total current i of this level-oneAIt is ahead of resistance branch electric current ii.If not considering RiWith
C2Influence, R and C1Constitute second level phase-shift network, the total current i of this level-oneoLag behind capacitive branch electric current；Even if considering Ri
With C2Influence, this branch is still capacitive branch, total current ioLag behind capacitive branch electric current iAQualitative conclusions will not change
Become.Generally speaking, influence of the two-stage RC phase-shift network in Fig. 1 to current phase plays the effect cancelled out each other, it also because
This and be named as current mode phase shift complementation unit.In general, the situation of change of phase shift is related with frequency.In some frequency
Under, the total phase shift of electric current caused by phase shift complementation unit will be zero, so that entire circuit is become positive feedback amplifier, obtain sine wave
Oscillation；Therefore this frequency also just becomes frequency of oscillation.
Similarly, in Fig. 2, influence of the two-stage RL phase-shift network to current phase plays the effect cancelled out each other, only
First order phase-shift network generates hysteresis, and second level phase-shift network generates anticipation.
For in-phase voltage amplifier, if output voltage without phase shift is fed back to input terminal, entire circuit is just
As positive feedback amplifier, it is possible to realizing sine-wave oscillation.And the function of phase shift complementation unit is exactly by output voltage
Feed back to input terminal to no phase shift.In Fig. 3, phase shift complementation unit both end voltage V is considerediWith VoPhase relation.Due to RiWith
C2Parallel connection, therefore phase shift complementation unit also includes Ri, it is made of two-stage RC phase-shift network.RiWith C2Parallel connection constitutes first order phase
Move network, the electric current i of this level-oneAIt is ahead of voltage Vi.If not considering RiWith C2Influence, R and C1Second level phase-shift network is constituted,
Due to resistance and capacitance partial pressure, the total voltage V of this level-oneoLag behind the electric current i of this branchA；Even if considering RiWith C2Influence,
The characteristics of resistance is divided with capacitive device will not change, the total voltage V of this level-oneoLag behind the electric current i of this branchAQualitative knot
By will not change.Generally speaking, the two-stage RC phase-shift network in Fig. 3 plays the effect cancelled out each other to the variation of voltage-phase
Fruit, therefore it is just named as voltage-type phase shift complementation unit.Under some frequency, voltage caused by phase shift complementation unit is total
Phase shift will be zero, so that entire circuit is become positive feedback amplifier, obtain sine-wave oscillation；Therefore this frequency also just becomes oscillation
Frequency.
Similarly, in Fig. 4, two-stage RL phase-shift network plays the effect cancelled out each other to the variation of voltage-phase, only
First order phase-shift network generates hysteresis, and second level phase-shift network generates anticipation.
Quantitative analysis:
Consider to be convenient for application because form is simple, to there is the case where larger application value.Here it is two reactance components
The identical situation of component parameters (capacitance of two capacitors i.e. in phase shift complementation unit is identical or the inductance value of two inductance
It is identical).
1. working as C1=C2When=C, analyze the complementary oscillator of current mode RC phase shift (Fig. 1)
The gain of basic amplifier is
The feedback factor of feedback network (i.e. current mode phase shift complementation unit) is
It can simplify for
Thus loop gain is obtained
In general, circuit starting condition for oscillation is T (j ω) > 1.?When, loop gain is positive, explanation
Influence of the current mode two-stage RC phase-shift network to phase at this time is just cancelled out each other, and output electric current without phase shift feeds back to input
End, entire circuit become positive feedback amplifier.More precisely, work as Ai> 1+2RiWhen/R, loop gain is greater than 1.It follows that
The starting condition for oscillation of the complementary oscillator of current mode RC phase shift (Fig. 1) can be embodied as
Ai> 1+2Ri/R
Corresponding oscillation angular frequency is
Frequency of oscillation is
2. working as L1=L2When=L, analyze the complementary oscillator of current mode RL phase shift (Fig. 2)
Such case is exactly circuit obtained from two capacitors in Fig. 1 to be all substituted for the inductance that size is L, therefore formula
The impedance (j ω C) of middle capacitor-1Also the impedance j ω L of inductance should be replaced with, so loop gain is correspondingly written as
Thus it obtains, starting condition for oscillation is
Ai> 1+2Ri/R
Corresponding oscillation angular frequency is
Frequency of oscillation is
3. working as C1=C2When=C, analyze the complementary oscillator of voltage-type RC phase shift (Fig. 3)
The gain of basic amplifier is
The feedback factor of feedback network (i.e. voltage-type phase shift complementation unit) is
It can simplify for
Loop gain is
?When, loop gain is positive, and illustrates that voltage-type two-stage RC phase-shift network is to phase at this time
Influence is just cancelled out each other, and output voltage without phase shift feeds back to input terminal, and entire circuit becomes positive feedback amplifier.It is more acurrate
Ground is said, A is worked asv> 2+R/RiWhen, loop gain is greater than 1.It follows that the starting of oscillation of the complementary oscillator of voltage-type RC phase shift (Fig. 3)
Condition can be embodied as
Av> 2+R/Ri
Corresponding oscillation angular frequency is
Frequency of oscillation is
4. working as L1=L2When=L, analyze the complementary oscillator of voltage-type RL phase shift (Fig. 4)
Such case is exactly circuit obtained from two capacitors in Fig. 3 to be all substituted for the inductance that size is L, therefore formula
The impedance (j ω C) of middle capacitor-1Also the impedance j ω L of inductance should be replaced with, so loop gain is correspondingly written as
Thus it obtains, starting condition for oscillation is
Av> 2+R/Ri
Corresponding oscillation angular frequency is
Frequency of oscillation is
It illustrates:
According to the above qualitative analysis and quantitative analysis, by (handing over the complementary oscillator of the phase shift according to Fig. 1-Fig. 4
Logical circulation road) and multiple practical circuits for building carry out Experiment of Electrical Circuits, having proven to this kind of circuit can vibrate, and starting condition for oscillation and
Frequency of oscillation is consistent with the conclusion of aforementioned theory analysis, this demonstrate imagination of the invention with design be it is feasible, analysis is just
True.
In the case of identical for two reactance component parameters of Such analysis, can circuit starting of oscillation and frequency of oscillation after starting of oscillation
Determinant all have the characteristics that simplicity and be easy to determine, it may be assumed that circuit can starting of oscillation be solely dependent upon amplifier gain and resistance
Simple comparison, and the expression formula of frequency of oscillation be only a simple formula related with reactance component and resistance.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (4)
1. a kind of complementary oscillator of phase shift, it is characterised in that: be made of an amplifier and a phase shift complementation unit；It is described
Phase shift complementation unit is two-stage phase-shift network；The two-stage phase-shift network is by a resistance and the identical reactance of two impedance properties
Element composition；
The amplifier is current amplifier, when the alternating current direction of input terminal is to flow into amplifier, the current amplifier
It is outflow amplifier in the obtained alternating current direction of output end；At this point, the identical reactance element of described two impedance properties
Part is the first reactance component and the second reactance component；The output end of the amplifier connects first end and the institute of the resistance simultaneously
State the first end of the first reactance component；The input terminal of the amplifier connects second end and the institute of first reactance component simultaneously
State the first end of the second reactance component；The second end of the resistance and the second end of second reactance component are grounded；Or
The amplifier is voltage amplifier, which is in-phase amplifier；At this point, described two impedance properties are identical
Reactance component be the first reactance component and the second reactance component；The output end of the amplifier connect with the resistance after again with
The first reactance component series connection；The second end of first reactance component connects the first end of second reactance component simultaneously
With the input terminal of the amplifier；The second end of second reactance component is grounded.
2. the complementary oscillator of phase shift according to claim 1, it is characterised in that: the identical electricity of described two impedance properties
Anti- element is all capacitor or is all inductance.
3. the complementary oscillator of phase shift according to claim 1, it is characterised in that: the two-stage phase-shift network to electric current or
The influence of voltage-phase has complementarity.
4. the complementary oscillator of phase shift according to claim 1, it is characterised in that: the front and back in the two-stage phase-shift network
Phase shift caused by two-level configuration be it is opposite, level-one be it is advanced, in addition level-one be lag, with achieve the purpose that phase shift complementation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610151657.7A CN105827206B (en) | 2016-03-16 | 2016-03-16 | The complementary oscillator of phase shift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610151657.7A CN105827206B (en) | 2016-03-16 | 2016-03-16 | The complementary oscillator of phase shift |
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| Publication Number | Publication Date |
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| CN105827206A CN105827206A (en) | 2016-08-03 |
| CN105827206B true CN105827206B (en) | 2019-01-29 |
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| CN106788419A (en) * | 2016-11-22 | 2017-05-31 | 广东技术师范学院 | A kind of high performance adjustable wide band radio-frequency oscilator system |
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| CN86101843B (en) * | 1986-03-17 | 1988-06-01 | 王经一 | Even q resonant amplifier |
| CN2347311Y (en) * | 1998-03-24 | 1999-11-03 | 向明 | Resistor-capacitor network voltage controlled sine-wave generator |
| JP5158293B2 (en) * | 2011-05-09 | 2013-03-06 | パナソニック株式会社 | RC oscillator circuit |
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Granted publication date: 20190129 Termination date: 20210316 |