CN110071704A - A kind of annular RC pierce circuit - Google Patents
A kind of annular RC pierce circuit Download PDFInfo
- Publication number
- CN110071704A CN110071704A CN201910341511.2A CN201910341511A CN110071704A CN 110071704 A CN110071704 A CN 110071704A CN 201910341511 A CN201910341511 A CN 201910341511A CN 110071704 A CN110071704 A CN 110071704A
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- Prior art keywords
- phase inverter
- resistance
- annular
- pierce circuit
- comparator
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- 230000003139 buffering effect Effects 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 12
- 101100286980 Daucus carota INV2 gene Proteins 0.000 description 8
- 101100397045 Xenopus laevis invs-b gene Proteins 0.000 description 8
- 101150110971 CIN7 gene Proteins 0.000 description 7
- 101150110298 INV1 gene Proteins 0.000 description 7
- 101100397044 Xenopus laevis invs-a gene Proteins 0.000 description 7
- 230000005611 electricity Effects 0.000 description 7
- 101100508840 Daucus carota INV3 gene Proteins 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/01—Details
- H03K3/011—Modifications of generator to compensate for variations in physical values, e.g. voltage, temperature
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/021—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of more than one type of element or means, e.g. BIMOS, composite devices such as IGBT
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- Manipulation Of Pulses (AREA)
Abstract
The invention discloses a kind of annular RC pierce circuits, are related to integrated circuit fields.Annular RC pierce circuit includes the first phase inverter, the second phase inverter, third phase inverter and first resistor, the input terminal of first phase inverter is connected to the output end of third phase inverter, the input terminal of third phase inverter is connected to the output end of the second phase inverter, and the both ends of first resistor are connected to the output end of the first phase inverter and the output end of third phase inverter；Comparator is also connected between first phase inverter and the second phase inverter, for the output end of the first phase inverter by capacitance connection in the first input end of comparator, comparator output terminal is connected to the input terminal of the second phase inverter.For technical solution of the present invention by the way that comparator is arranged in annular RC pierce circuit, the reference voltage of comparator is directly proportional to supply voltage, and when comparator is flipped, because trigging signal is unrelated with supply voltage, the frequency of oscillator does not change with supply voltage.
Description
Technical field
The present invention relates to technical field of integrated circuits, more particularly to a kind of annular RC pierce circuit.
Background technique
Oscillator occupies an important position in each class of electronic devices as clock source, how to generate stable clock, is
Problem in the urgent need to address.
Fig. 1 is the basic structure of oscillator in the prior art, by 4 phase inverters, 1 buffer, 1 resistance and 1 electricity
Hold composition, the structure is since circuit is simple, is easily integrated and is widely used.The input terminal of phase inverter V1 is connected to node Va simultaneously
As the input node of RC oscillator, the output end Vb of phase inverter V1 is connected to capacitor, and the other end Vc of capacitor is connected to resistance
One end, the node Vc and input node as phase inverter V2, the output node Vd of phase inverter V2 are connected to the defeated of phase inverter V3
Enter end, the output end vo of phase inverter V3 is connected to the input terminal of phase inverter V4, and using Vo as the output of RC oscillator, by slow
Rush device output clock.The output end of phase inverter V4 is connected to the other end Va of resistance, and the input as phase inverter V1.
For the working principle of the oscillator as shown in Fig. 2, abscissa is the time, ordinate is voltage, it is assumed that at the beginning of powering on, t=
When 0, input node Va=0 of phase inverter V1, then the voltage of node Vb is high level VDD (supply voltage), the voltage of node Vc
For high level VDD；As t=0 ~ T1, node Vc discharges to capacitor by resistance R, to make the reduction of node Vc voltage, works as t
When=T1, node Vc voltage drops to, reached the overturning point of phase inverter V2, phase inverter V2 is flipped, node Vd
Become high level, while phase inverter V3 is flipped, node Vo becomes low level 0, and and then phase inverter V4 is also flipped, section
Point Va becomes high level VDD, and phase inverter V1 is flipped, and node Vb becomes 0.And Vc ≈ at this time, due to capacitor both ends
Pressure drop cannot be mutated, so when the voltage of node Vb is reduced to 0 by VDD, node Vc byBecome.In t
=T1 ~ T2, node Va are charged by node Vc of the resistance R to capacitor, and as t=T2, node Vc voltage is increased to,
Phase inverter V2 is flipped, and node Va becomes low level 0, then node Vb becomes high level VDD, same reason, due to capacitor
The pressure drop at both ends cannot be mutated, so when node Vb is upgraded to VDD by 0, node Vc byBecome.In t=T2
~ T3, node Vc discharges to capacitor by resistance R, and as t=T3, the voltage of node Vc is reduced to, phase inverter V2 hair
Raw overturning, so circulation is gone down, node Vo is by buffer clock output to load circuit.
Ignore the delay of phase inverter, the period of the RC oscillator,
Wherein,, KSWFor the overturning point of phase inverter, VSWFor the voltage value of the phase inverter.
From expression above as can be seen that working as VSWWith the ratio K of supply voltage VDDSWWhen for constant, the week of oscillator
Phase T is steady state value, i.e., the frequency of oscillator does not change with the variation of supply voltage.However the turnover voltage of existing phase inverter
It is difficult to be designed to directly proportional to supply voltage.For CMOS technology, the trigging signal of phase inverter and the threshold value electricity of PMOS, NMOS
Pressure, breadth length ratio, supply voltage, environment temperature etc. have relationship, so the frequency of oscillator in the prior art is with power supply electricity
The variation of pressure and change, influence the design of subsequent conditioning circuit, increase circuit difficulty.
Summary of the invention
The main purpose of the present invention is to provide a kind of annular RC pierce circuits, it is intended to make the frequency of oscillator not with electricity
The variation of pressure and change.
To achieve the above object, the present invention provides a kind of annular RC pierce circuit, including the first phase inverter, the second reverse phase
Device, third phase inverter and first resistor, the input terminal of first phase inverter are connected to the output end of the third phase inverter, institute
The input terminal for stating third phase inverter is connected to the output end of second phase inverter, and the both ends of the first resistor are connected to
The output end of the output end of first phase inverter and the third phase inverter；First phase inverter and second phase inverter
Between be also connected with comparator, the output end of first phase inverter is by capacitance connection in the first input of the comparator
End, the comparator output terminal are connected to the input terminal of second phase inverter.
Preferably, the first resistor is the resistance of Low Drift Temperature resistance, or floats resistance group by positive temperature drift resistance and subzero temperature
The resistance of conjunction.
Preferably, the pierce circuit further includes second resistance and 3rd resistor interconnected, the second resistance
The one end being connected with the 3rd resistor is connected to the second input terminal of the comparator, the other end connection of the second resistance
It is grounded in the other end of power supply, the 3rd resistor.
Preferably, the resistance value of the second resistance is equal with the resistance value of the 3rd resistor.
Preferably, the reference voltage of the comparator passes through equationIt calculates, wherein VVEFor
Comparator reference voltage, R2 and R3 are respectively the resistance value of the second resistance and the 3rd resistor, and VDD is supply voltage.
Preferably, the pierce circuit further includes buffer, and the buffer input is connected to second reverse phase
The output end output clock signal of the output end of device, the buffer extremely loads.
Preferably, first phase inverter, second phase inverter and the third phase inverter are high speed phase inverter.
Preferably, the comparator is high-speed comparator.
Preferably, the annular RC pierce circuit is also connected with cut-off signals input terminal, to input cut-off signals extremely
In the annular RC pierce circuit.
Technical solution of the present invention in annular RC pierce circuit by being arranged comparator, the reference voltage and electricity of comparator
Source voltage is directly proportional, and when comparator is flipped, remaining phase inverter in circuit is flipped simultaneously, because of trigging signal and electricity
Source voltage is unrelated, and the frequency of oscillator does not change with supply voltage.
Detailed description of the invention
Fig. 1 is the basic structure schematic diagram of oscillator in the prior art；
Fig. 2 is the operation principle schematic diagram of oscillator in the prior art；
Fig. 3 is the structural schematic diagram of annular RC pierce circuit of the invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The following further describes the present invention with reference to the drawings.
A kind of annular RC pierce circuit, as shown in figure 3, including the first phase inverter INV1, the second phase inverter INV2, third
Phase inverter INV3 and first resistor R1, the input terminal of the first phase inverter INV1 are connected to the defeated of the third phase inverter INV3
Outlet, the input terminal of the third phase inverter INV3 are connected to the output end of the second phase inverter INV2, the first resistor
The both ends of R1 are connected to the output end of the first phase inverter INV1 and the output end of the third phase inverter INV3；It is described
Comparator COMP is also connected between first phase inverter INV1 and the second phase inverter INV2, the first phase inverter INV1's
Output end is connected to the first input end of the comparator COMP by capacitor C, and the comparator COMP output end is connected to institute
State the input terminal of the second phase inverter INV2.
In some embodiments, the first resistor R1 is the resistance of Low Drift Temperature resistance.In further embodiments, first
Resistance R1 is the resistance that resistance combination is floated by positive temperature drift resistance and subzero temperature.
Preferably, the pierce circuit further includes second resistance R2 interconnected and 3rd resistor R3, and described second
Resistance R2 is connected to the second input terminal of the comparator COMP, the second resistance with the one end being connected the 3rd resistor R3
The other end of R2 is connected to power vd D, the other end ground connection of the 3rd resistor R3.Preferably, the resistance of the second resistance R2
It is worth equal with the resistance value of the 3rd resistor R3.In a particular embodiment, the ratio R 2 of second resistance R2 and 3rd resistor R3:
R3=1.Second resistance R2 and 3rd resistor R3 generally chooses polysilicon resistance, and polysilicon resistance does not need to do temperature-compensating, only needs
Matching is carried out to the ratio of second resistance R2 and third resistance value R3.In actual circuit application, second resistance R2 can adjust
Ratio with 3rd resistor R3 is to meet design requirement.
Preferably, the reference voltage of the comparator COMP passes through equationIt calculates, wherein
VVEFor comparator COMP reference voltage, R2 and R3 are respectively the resistance value of the second resistance R2 and the 3rd resistor R3, and VDD is
Power supply vdd voltage.
Preferably, the pierce circuit further includes buffer BUF, and the buffer BUF input terminal is connected to described
The output end output clock signal clk of the output end of two phase inverter INV2, the buffer BUF extremely loads.
Preferably, first phase inverter, second phase inverter and the third phase inverter are high speed phase inverter.It is high
The propagation delay time of fast phase inverter is minimum, transmission speed is fast.In further embodiments, the first phase inverter, the second phase inverter and
Three phase inverters may be different types of phase inverter.
Preferably, the comparator is high-speed comparator.High-speed comparator is with transmission speed is fast, time delay is small, imbalance is small
The characteristics of.
Preferably, the annular RC pierce circuit is also connected with cut-off signals input terminal, to input cut-off signals extremely
In the annular RC pierce circuit.When cut-off signals are input in annular RC pierce circuit by cut-off signals input terminal,
Annular RC pierce circuit shutdown, to reduce the power consumption of circuit.
As shown in figure 3, the working principle of annular RC pierce circuit of the invention is: the input terminal of the first phase inverter INV1 connects
It is connected to the input terminal first node VA of the annular RC pierce circuit, the output end of the first phase inverter INV1 passes through second node
VB is connected to capacitor C, and the capacitor C other end is connected to first resistor R1 by third node VC, and comparator COMP output end passes through
Fourth node VD is connected to the second phase inverter INV2, and comparator COMP first input end is connected to capacitor C, the second input terminal passes through
5th node VE is connected to second resistance R2 and 3rd resistor R3, and the reference voltage of comparator COMP is by second resistance R2 and third
Resistance R3 partial pressure generates, and comparator COMP is by comparing reference voltage and third node VC voltage to export comparison result to second
Phase inverter INV2, the second phase inverter INV2 are connected to buffer BUF by the 6th node VO, and buffer BUF is by clock signal clk
Output extremely loads.The output end of third phase inverter INV3 is connected to first node VA.
The turnover voltage of comparator COMP is determined by its reference voltage.As long as the therefore reference voltage of comparator COMP
It is unrelated with power supply vdd voltage, then the frequency of annular RC pierce circuit would not change with the variation of power supply vdd voltage.
The reference voltage of comparator COMP passes through equationIt calculates, as the voltage V of third node VCVCGreatly
In the reference voltage V of comparator COMPVEWhen, comparator COMP is flipped, and exports low level 0, i.e. VVD=0.When third node
The voltage V of VCVCReference voltage V less than comparator COMPVEWhen, comparator COMP is flipped, and exports high level VDD, i.e. VVD
=VDD。
The resistance value of second resistance R2 is equal with 3rd resistor R3 resistance value, i.e. R2=R3, then.Than
Overturning point compared with device COMP are as follows:；The period of annular RC pierce circuit is logical are as follows:=2.2RC, wherein R is the resistance value of first resistor R1, and C is electricity
Hold the value of C, period, the i.e. oscillator RC related to the value of the resistance value of first resistor R1 and capacitor C of annular RC pierce circuit
Period not with power vd D change so that annular RC pierce circuit frequency stabilization of the invention.
It should be understood that the above is only a preferred embodiment of the present invention, the scope of the patents of the invention cannot be therefore limited,
It is all to utilize equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it is applied directly or indirectly in
Other related technical areas are included within the scope of the present invention.
Claims (9)
1. a kind of annular RC pierce circuit, including the first phase inverter, the second phase inverter, third phase inverter and first resistor, institute
The input terminal for stating the first phase inverter is connected to the output end of the third phase inverter, and the input terminal of the third phase inverter is connected to
The output end of second phase inverter, the both ends of the first resistor are connected to output end and the institute of first phase inverter
State the output end of third phase inverter；It is characterized in that, being also connected with ratio between first phase inverter and second phase inverter
Compared with device, for the output end of first phase inverter by capacitance connection in the first input end of the comparator, the comparator is defeated
Outlet is connected to the input terminal of second phase inverter.
2. annular RC pierce circuit according to claim 1, which is characterized in that the first resistor is Low Drift Temperature resistance
Resistance, or by positive temperature drift resistance and subzero temperature drift resistance combination resistance.
3. annular RC pierce circuit according to claim 1, which is characterized in that the pierce circuit further includes mutual
The second resistance and 3rd resistor of connection, one end that the second resistance is connected with the 3rd resistor are connected to the comparator
The second input terminal, the other end of the second resistance is connected to power supply, the other end ground connection of the 3rd resistor.
4. annular RC pierce circuit according to claim 3, which is characterized in that the second resistance and 3rd resistor
Resistance value is equal.
5. annular RC pierce circuit according to claim 4, which is characterized in that the reference voltage of the comparator passes through
EquationIt calculates, wherein VVEFor comparator reference voltage, R2 and R3 are respectively the second resistance
With the resistance value of the 3rd resistor, VDD is supply voltage.
6. annular RC pierce circuit according to claim 1, which is characterized in that the pierce circuit further includes buffering
Device, the buffer input are connected to the output end of second phase inverter, the output end output clock letter of the buffer
Number to load.
7. annular RC pierce circuit according to claim 1, which is characterized in that first phase inverter, described second
Phase inverter and the third phase inverter are high speed phase inverter.
8. annular RC pierce circuit according to claim 1, which is characterized in that the comparator is high-speed comparator.
9. annular RC pierce circuit according to claim 1, which is characterized in that the annular RC pierce circuit also connects
It is connected to cut-off signals input terminal, to input cut-off signals into the annular RC pierce circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910341511.2A CN110071704A (en) | 2019-04-26 | 2019-04-26 | A kind of annular RC pierce circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910341511.2A CN110071704A (en) | 2019-04-26 | 2019-04-26 | A kind of annular RC pierce circuit |
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| Publication Number | Publication Date |
|---|---|
| CN110071704A true CN110071704A (en) | 2019-07-30 |
Family
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| CN201910341511.2A Pending CN110071704A (en) | 2019-04-26 | 2019-04-26 | A kind of annular RC pierce circuit |
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