CN108011590A - A kind of high-precision low-power consumption RC oscillators - Google Patents
A kind of high-precision low-power consumption RC oscillators Download PDFInfo
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- CN108011590A CN108011590A CN201610940033.3A CN201610940033A CN108011590A CN 108011590 A CN108011590 A CN 108011590A CN 201610940033 A CN201610940033 A CN 201610940033A CN 108011590 A CN108011590 A CN 108011590A
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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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Abstract
The present invention relates to a kind of high accuracy to adjust low-power consumption RC oscillators, including bias current element circuit, charge/discharge unit circuit, adjustable reference voltage generating unit circuit, anti-imbalance comparator unit circuit, pulse output unit circuit and clock shaping output unit circuit.The present invention passes through design method simple in structure, in the case of only with a comparator, the effective influence for avoiding comparator imbalance voltage, realize low power dissipation design, and other control modules such as external temperature sensing processing can be passed through, by adjusting the adjusting reference voltage control signal of adjustable reference voltage generation circuit, the high-precision clock output function under varying environment is realized.
Description
Technical field
The present invention relates to technical field of integrated circuits, a kind of RC oscillators of high-precision low-power consumption are specifically designed.
Background technology
With the development of large scale integrated circuit, especially more system-on-chip (system on chip, SoC) applications
In, pierce circuit increasingly becomes a very important module.Oscillator is divided into resistance-capacitance oscillator i.e. RC oscillators, inductance
Capacitor oscillator, crystal oscillator, fork generator etc..RC oscillators are by charging and discharging realization vibration to capacitance
The output of signal, the value by adjusting capacitance or resistance change the frequency of oscillator signal.Relative to other various types of vibrations
Device, RC oscillators have the advantages of simple in structure, power consumption is relatively low.
The frequency accuracy of the outputting oscillation signal of existing RC oscillators is relatively low, is easily subject to supply voltage, temperature etc. to influence,
And RC oscillators are in current many SoC applications, the generation for the clock signal being all used as under resting state, therefore oscillator
Power consumption directly influence the dormancy power consumption of whole chip.So how to design simple in structure, output frequency precision is higher, and
And the relatively low RC oscillators of power consumption are a research topics highly significant.
The content of the invention
In order to solve the above technical problems, the present invention provides a kind of RC oscillators, circuit structure is simple, and the vibration letter exported
Number frequency there is higher precision.
The technical solution adopted by the present invention is as follows：A kind of high accuracy adjusts low-power consumption RC oscillators, including bias current
Element circuit, charge/discharge unit circuit, adjustable reference voltage generating unit circuit, anti-imbalance comparator unit circuit, pulse are defeated
Go out element circuit and clock shaping output unit circuit；
Bias current circuit, receives external bias voltage signal IREF_LP and shut-off enable signal LP_EN, output biasing
Current signal is to charge-discharge circuit, adjustable reference voltage generation circuit, anti-imbalance comparator circuit；
Charge-discharge circuit, receive exterior shut-off enable signal LP_EN, bias current circuit output bias current signal,
The cyclic pulse signal of impulse output circuit, the first input end of output triangular signal to anti-imbalance comparator circuit；
Adjustable reference voltage generation circuit, reception external bias voltage signal IREF_LP, bias current circuit produce inclined
Put current signal, externally input adjusting reference voltage control signal VREF_CTRL, output reference voltage signal to anti-imbalance ratio
Compared with the second input terminal of device circuit；
Anti- imbalance comparator circuit, receives exterior shut-off enable signal LP_EN, the bias current that bias current circuit produces
The reference voltage signal of signal, the triangular signal produced to charge-discharge circuit and the generation of adjustable reference voltage generation circuit carries out
Compare, output periodic swinging control signal to impulse output circuit；
Impulse output circuit, receives the periodic swinging control signal of anti-imbalance comparator circuit output, output is periodically
Pulse signal is to clock shaping output circuit, charge-discharge circuit；
Clock shaping output circuit, receives the recurrent pulses letter of exterior shut-off enable signal LP_EN, impulse output circuit
Number, periodic timing signal RC_CLKO is exported, and positive and negative clock signal is fed back to anti-imbalance comparator circuit, realize that RC vibrates
Device exports.
The bias current element circuit includes PMOS tube P1, P2, P3, P4, P5, P6；The source electrode of P1, P2, P3 with electricity
Source connects, grid connect altogether and for input the drain electrode of external bias voltage signal IREF_LP, P1, P2, P3 respectively with P4, P5, P6
Source electrode connection；The grid of P4, P5, P6 connect and are used to input the drain electrode of shut-off enable signal LP_EN, P4, P5, P6 and uses respectively
In output bias current signal to charge-discharge circuit, adjustable reference voltage generation circuit, anti-imbalance comparator circuit.
The adjustable reference voltage generation circuit includes 7 N times PMOS tube pair；Every 7 PMOS tube are to for one group；
Each PMOS tube is to including two PMOS tube；Source electrode of the source electrode of first PMOS tube as PMOS tube pair, grid are made
For the grid of PMOS tube pair, drain electrode is connected with the second PMOS tube source electrode, the drain electrode to drain as PMOS tube pair of the second PMOS tube,
Control pole of the grid of second PMOS tube as PMOS tube pair；
The source electrode of the PMOS tube pair is connected with power supply, and grid is used to input external bias voltage signal IREF_LP, controls
Pole, which is used to input, adjusts reference voltage control signal VREF_CTRL；The three, the 4th PMOS tube in each group connect drain electrode,
Five, the six, the 7th PMOS tube connect drain electrode；
Resistance is connected between the drain electrode of first, second, third, the 5th PMOS tube pair of each group；First group of the first PMOS
Pipe passes through resistance eutral grounding to drain electrode；Electricity is connected between the drain electrode of every group of the 7th PMOS tube pair and next group of the first PMOS tube pair
Resistance；Second input of the drain electrode of 5th PMOS tube pair of end group through resistance output reference voltage signal to anti-imbalance comparator circuit
End.
The anti-imbalance comparator unit circuit includes first switch conversion circuit and second switch conversion circuit；Described
One conversion switch, second switch conversion circuit CLK_CTRL ends, that CLK_CTRLN ends are respectively used to input clock shaping is defeated
Go out the positive clock signals of electronic feedback, anticlockwise signal；The first input end of first switch conversion circuit, the second input terminal difference
For inputting triangular signal, reference voltage signal；Output terminal Y1, the output terminal Y2 of first switch conversion circuit respectively with NMOS
Grid, the grid of NMOS tube N4 of pipe N3；The source electrode connection of N3, N4, the bias current for input bias current circuit output
Signal；N3 drain electrodes, the source electrode with NMOS tube N5, the source electrode of NMOS tube N6 are connected respectively for the drain electrode of N4；The gate interconnection of N5, N6,
And it is connected with the first input end of second switch conversion circuit, N5 drain electrodes, N6 grounded drains；The source electrode of N5, N6 source electrodes respectively with
The output terminal Y1 of second switch conversion circuit, output terminal Y2 connections；The second input terminal and PMOS tube of second switch conversion circuit
The source electrode connection of the grid of P35, the grid of NMOS tube N7, NMOS tube N8；P35 source electrodes are connected with power supply；The source electrode of N7 is leaked with P35
Pole connects, for exporting periodic swinging control signal to impulse output circuit；N7 drain electrodes, N8 grounded drains；N8 grids are used for
The exterior shut-off enable signal LP_EN of input.
Conversion switch includes four on-off circuits；The clock end CLKN of first switch circuit, the 3rd on-off circuit
Clock end CLKN is used for the positive clock signals of input clock shaping output circuit, the clock end CLKN of second switch circuit, the 4th
The clock end CLKN of on-off circuit is used for the anticlockwise signal of input clock shaping output circuit；First switch circuit is opened to the 4th
In powered-down road, the clock end CLK of each on-off circuit is connected with the clock end CLKN of next on-off circuit；Second switch circuit
Input terminal, the 3rd on-off circuit input terminal connection, and as the first input end of conversion switch；First switch circuit
Input terminal, the 4th on-off circuit input terminal connection, and as the second input terminal of conversion switch；First switch circuit
Output terminal, second switch circuit output terminal connection, and as the output terminal Y1 of conversion switch；3rd on-off circuit
The output terminal connection of output terminal, the 4th on-off circuit, and as the output terminal Y2 of conversion switch.
The impulse output circuit includes two phase inverters being linked in sequence；The input terminal of first phase inverter is used to input anti-
The periodic swinging control signal COMP_O of imbalance comparator circuit, output terminal are used for feedback cycle pulse signal RC_CTRL
To charge-discharge circuit；Second inverter output exports cyclic pulse signal RC_CLKI to clock shaping output circuit.
The clock shaping output circuit includes trigger and phase inverter；The clock end of the trigger is used to input the cycle
Property pulse signal RC_CLKI；Reset terminal is used to input shut-off enable signal LP_EN, and output terminal exports positive clock signals to anti-mistake
Comparator unit circuit is adjusted, also inverted device exports anticlockwise signal to anti-imbalance comparator unit circuit；The output of trigger
Backward end is connected with data terminal, and through another phase inverter output periodic timing signal RC_CLKO.
Beneficial effects of the present invention and advantage：
The present invention in the case of only with a comparator, effectively avoids comparing by design method simple in structure
Compared with the influence of device offset voltage, low power dissipation design is realized, and can lead to by other control modules such as external temperature sensing processing
The adjusting reference voltage control signal of adjustment adjustable reference voltage generation circuit is crossed, realizes the high-precision clock under varying environment
Output function.
Brief description of the drawings
Fig. 1 is circuit structure diagram of the embodiment of the present invention.
Fig. 2 is bias current element circuit figure.
Fig. 3 is charge/discharge unit circuit diagram.
Fig. 4 is adjustable reference voltage generating unit circuit diagram.
Fig. 5 is anti-imbalance comparator unit circuit unit circuit diagram.
Fig. 6 is conversion switch element circuit figure.
Fig. 7 is pulse output unit circuit diagram.
Fig. 8 is clock shaping output unit circuit diagram.
Fig. 9 is each signal simulation curve map of present pre-ferred embodiments.
Embodiment
Technical solution provided by the invention is described further with specific embodiment below in conjunction with the accompanying drawings.
RC oscillators provided by the invention include bias current circuit, charge-discharge circuit, adjustable reference voltage generation circuit,
Anti- imbalance comparator circuit, impulse output circuit, clock shaping output circuit.Wherein,
The bias current circuit receiving voltage offset signal, output are used for for charge-discharge circuit, adjustable reference voltage
Generation circuit, anti-imbalance comparator circuit provide the bias current signal needed for its work, and have the function of switch off current.
Further, the charge-discharge circuit exports week under the control for the first feedback signal that impulse output circuit produces
Phase property triangular signal to it is anti-imbalance comparator circuit first input end.
Further, adjustable voltage is exported under control of the adjustable reference voltage generation circuit by exterior Regulate signal
Reference signal to it is anti-imbalance comparator circuit the second input terminal.
Further, the anti-imbalance comparator circuit receives triangular signal and adjustable reference that charge-discharge circuit produces
The reference voltage signal of voltage generation circuit generation, in two positive and negative clock feedback signals that clock shaping output circuit produces
Under control, produce periodic swinging control signal and export to shaping circuit.
Further, the impulse output circuit, receives the periodic swinging control letter of anti-imbalance comparator circuit output
Number, cyclic pulse signal is exported to clock shaping output circuit and exports the first feedback signal to charge-discharge circuit.
Further, the clock shaping output circuit, receives the cyclic pulse signal of impulse output circuit, output week
Phase property clock signal, and two positive and negative clock signals of anti-imbalance comparator circuit are fed back to, realize that RC oscillators export.
The present invention provides a kind of RC oscillators of high-precision low-power consumption.
As shown in Figure 1, it is circuit structure diagram of the embodiment of the present invention；RC oscillators of the embodiment of the present invention include：Bias current
Element circuit, charge/discharge unit circuit, adjustable reference voltage generating unit circuit, anti-imbalance comparator unit circuit, pulse are defeated
Go out element circuit, clock shaping output unit circuit.
Wherein bias current circuit receives external bias voltage signal IREF_LP and shut-off enable signal LP_EN, output are inclined
Electric current is put to charge-discharge circuit, adjustable reference voltage generation circuit, anti-imbalance comparator circuit.
The bias current signal that charge-discharge circuit receives exterior shut-off enable signal LP_EN, bias current circuit produces, arteries and veins
The first feedback signal of output circuit generation is rushed, produces first input of the periodic triangular ripple signal to anti-imbalance comparator circuit
End.
Adjustable reference voltage generation circuit reception external bias voltage signal IREF_LP, bias current circuit produce inclined
14 adjusting reference voltage control signal VREF_CTRL signals of current signal and external input are put, produce the base of adjustable voltage
Calibration signal to it is anti-imbalance comparator circuit the second input terminal.
Anti- imbalance comparator circuit receives the bias current that exterior shut-off enable signal LP_EN and bias current circuit are produced
The reference voltage signal of signal, the triangular signal produced to charge-discharge circuit and the generation of adjustable reference voltage generation circuit,
Under the control for two positive and negative clock feedback signals that clock shaping output circuit produces, output is compared, produces and periodically shakes
Control signal is swung to export to impulse output circuit.
Impulse output circuit, receives the periodic swinging control signal of anti-imbalance comparator circuit output, produces periodically
Pulse signal is to clock shaping output circuit and exports the first feedback signal to charge-discharge circuit.
Clock shaping output circuit, receives exterior shut-off enable signal LP_EN, the recurrent pulses letter of impulse output circuit
Number, periodic timing signal RC_CLKO is exported, and to feed back to anti-two of comparator circuit switch controls of imbalance just anticlockwise
Signal, realizes that RC oscillators export.
Described, bias current element circuit is as shown in Fig. 2, external bias voltage signal IREF_LP connects three p-types respectively
The grid of metal-oxide-semiconductor (the present embodiment can be the first~tri- p-type metal-oxide-semiconductor P1~P3), the source electrode of P1~P3 connect supply voltage respectively
The drain electrode of VDD, P1~P3 connect the source of three p-type metal-oxide-semiconductors (the present embodiment can be the four~six p-type metal-oxide-semiconductor P4~P6) respectively
Pole, the drain electrode of the exterior shut-off enable signal LP_EN, P4 of grid connection of P4~P6 export signal V_RC to charge-discharge circuit, P5
Drain electrode export signal VREF to adjustable reference voltage generation circuit, the drain electrode of P6 exports signal I_COMP to anti-imbalance comparator
Circuit.External signal IREF_LP provides bias voltage and provides drain electrode output of the stable bias current from P4~P6, outside shut-off
Enable signal LP_EN control circuits enter shutdown mode, when LP_EN signals meet VDD, P4~P6 shut-offs, bias current circuit into
Enter shutdown mode, no current output.
Described, charge/discharge unit circuit is as shown in figure 3, the first feedback signal RC_CTRL that impulse output circuit produces connects
Connect the grid of a N-type metal-oxide-semiconductor (the present embodiment can be the first N-type metal-oxide-semiconductor N1), the leakage of source electrode connection the earth signal GND, N1 of N1
Pole connects one end of a resistance (the present embodiment can be first resistor R1), and the other end of R1 connects a capacitance (the present embodiment
Can be the first capacitance C1) one end, and the drain electrode of a N-type metal-oxide-semiconductor (the present embodiment can be the second N-type metal-oxide-semiconductor N2), and
Bias current circuit signal V_RC and as output signal to it is anti-imbalance comparator circuit first input end.Another termination of C1
The source electrode connection earth signal GND of the exterior shut-off enable signal LP_EN, N2 of grid connection of earth signal GND, N2.Outside shut-off makes
Energy signal LP_EN control circuits enter shutdown mode, and when LP_EN signals meet VDD, N2 is opened, by V_RC voltage pull-downs, discharge and recharge
Circuit oscillation turns off.Under normal mode of operation, LP_EN signals meet GND.
Described, adjustable reference voltage generating unit circuit is as shown in figure 4, external bias voltage signal IREF_LP connects respectively
The grid of 14 p-type metal-oxide-semiconductors (the present embodiment can be the 7th~20 p-type metal-oxide-semiconductor P7~P20) is connect, the source electrode of P7~P20 connects
VDD is met, each (the present embodiment can be the 21st~34 p-types to 14 p-type metal-oxide-semiconductors of connection respectively for the drain electrode of P7~P20
Metal-oxide-semiconductor P21~P34) source electrode, the grid of P21~P34 connects 14 adjusting reference voltage control signals of external input respectively
VREF_CTRL signals (VREF_CTRL0~VREF_CTRL13), nine resistance (the present embodiment can be the second~ten resistance R2~
P10) it is connected in series, one end connection R9 of R10, one end connection R3 of the other end connection ground GND, R2, the other end is connected to defeated
Go out VREF, produce the reference signal of adjustable voltage to the second input terminal of anti-imbalance comparator circuit, capacitance (this implementation
Example can be the second capacitance C2) as electric capacity of voltage regulation one end connection VREF, other end connection ground GND.The connecting pin connection of R9 and R10
The drain electrode of connecting pin connection P23~P24 of the drain electrode of the connecting pin connection P22 of the drain electrode of P21, R8 and R9, R7 and R8, R6 and R7
Connecting pin connection P25~P27 drain electrode, the drain electrode of the connecting pin connection P28 of R6 and R5, the connecting pin connection P29 of R5 and R4
Drain electrode, the drain electrode of connecting pin connection P30~P31 of R4 and R3, the drain electrode of connecting pin connection P32~P34 of R3 and R2.Pass through
Configure the different value of 14 adjusting reference voltage control signal VREF_CTRL signals of external input, thus it is possible to vary the output of VREF
Voltage, as the voltage comparison reference with periodic triangular ripple signal V_RC, can reach and change periodic swinging control letter
Number frequency purpose.
Described, anti-imbalance comparator unit circuit is connected to first switch conversion circuit as shown in figure 5, receiving V_RC signals
The X1 ends of (the present embodiment can be conversion switch 1), receive the X2 ends that vref signal is connected to first switch conversion circuit, connect
Receive the first feedback switch clock signal clk _ CTRL and be respectively connected to first switch conversion circuit, second switch conversion circuit (this
Embodiment can be conversion switch 2) CLK_CTRL ends, receive the second feedback switch clock signal clk _ CTRLN connect respectively
It is connected to the CLK_CTRLN ends of first switch conversion circuit, second switch conversion circuit, the output terminal Y1 of first switch conversion circuit
Connect the grid of a N-type metal-oxide-semiconductor (the present embodiment can be the 3rd N-type metal-oxide-semiconductor N3), the output terminal Y2 of first switch conversion circuit
Connect the grid of a N-type metal-oxide-semiconductor (the present embodiment can be the 4th N-type metal-oxide-semiconductor N4).N3 is connected with the drain electrode of N4 and and biased electrical
The I_COMP of current circuit output is connected.Source electrode one N-type metal-oxide-semiconductor (the present embodiment can be the 5th N-type metal-oxide-semiconductor N5) of connection of N3
Drain electrode, and be connected with the Y1 of second switch conversion circuit.The source electrode of N4 connects a N-type metal-oxide-semiconductor, and (the present embodiment can be the 6th N
Type metal-oxide-semiconductor N6) drain electrode, and be connected with the Y2 of second switch conversion circuit.The grid of N5 is connected with the grid of N6 and with second
The X1 of conversion switch is connected.The source electrode of N5 and the source electrode connection ground GND of N6.The X2 ends connection one of second switch conversion circuit
(the present embodiment can be for the grid of a p-type metal-oxide-semiconductor (the present embodiment can be the 35th p-type metal-oxide-semiconductor P35) and N-type metal-oxide-semiconductor
7th N-type metal-oxide-semiconductor N7) grid, and connect a N-type metal-oxide-semiconductor (the present embodiment can be the 8th N-type metal-oxide-semiconductor N8) drain electrode, N8
Grid connection shut-off enable signal LP_EN, N8 source electrode connection ground GND.The source electrode connection ground of source electrode the connection VDD, N7 of P35
The drain electrode of GND, P35 are connected with the drain electrode of N7 and are used as periodic swinging control signal COMP_O to export.
Described, first switch conversion unit circuit is identical with the structure of second switch conversion unit circuit, as shown in fig. 6,
It is made of four groups of identical on-off circuits of structure, by taking first switch circuit (the present embodiment can be for on-off circuit 1) structure as an example, one
(the present embodiment can be the 9th N-type to a p-type metal-oxide-semiconductor (the present embodiment can be the 36th p-type metal-oxide-semiconductor P36) with a N-type metal-oxide-semiconductor
Metal-oxide-semiconductor N9) source electrode be connected with source electrode and be connected to port IN, drain electrode is connected with draining and is connected to port OUT, the grid of P36
Pole is connected to port CLKN, and the grid of N9 is connected to port CLK.The IN ports of first switch circuit and the 4th on-off circuit (this
Embodiment can be on-off circuit 4) IN ports be connected, and be connected to outside port X2, (the present embodiment can be second switch circuit
On-off circuit 2) it is connected with the IN ports of the 3rd on-off circuit (the present embodiment can be on-off circuit 3), and it is connected to outside port
X1, the OUT terminal mouth of the OUT terminal mouth connection second switch circuit of first switch circuit, and it is connected to outside port Y1, the 3rd switch
The OUT terminal mouth of circuit connects the OUT terminal mouth of the 4th on-off circuit, and is connected to outside port Y2, the CLKN of first switch circuit,
The CLK of second switch circuit, the 3rd on-off circuit CLKN is connected with the CLK of the 4th on-off circuit, and is connected to outside port
CLK_CTRL, the CLK of first switch circuit, the CLKN of second switch circuit, the 3rd on-off circuit CLK and the 4th on-off circuit
CLKN is connected, and is connected to outside port CLK_CTRLN,
Described, anti-imbalance comparator circuit turns V_RC signals compared with vref signal, and using first switch
Change circuit to be inputted to pipe conversion, while output signal conversion is carried out using second conversion switch, utilize this knot
Structure mode other RC oscillators compared with implementation use the structure of two comparators for the offset voltage of elimination comparator,
In the case where only using a comparator circuit, substantial amounts of power consumption is saved, while can also effectively offset offset voltage
Influence.
Described, pulse output unit circuit is as shown in fig. 7, receive the periodic swinging control letter of anti-imbalance comparator circuit
Number COMP_O, connects first order inverter module, exports the first feedback signal RC_CTRL, first order inverter module connection the
Two level inverter module, output cyclic pulse signal RC_CLKI to clock shaping output circuit.
Described, clock shaping output unit circuit d type flip flop and two phase inverters as shown in figure 8, be made of.Periodicity arteries and veins
Clock (CLK) end of signal RC_CLKI connection d type flip flops is rushed, turns off the reset (R) of enable signal LP_EN connection d type flip flops
End, output terminal Q ends export signal and connect a phase inverter as the first feedback switch clock signal clk _ CTRL outputs, Q ends, instead
The output of phase device is as the second feedback switch clock signal clk _ CTRLN outputs.The data terminal D ends connection output of d type flip flop is anti-
To end (QN) end, QN ends connect an inverter module, and the output signal of phase inverter is as output periodic timing signal RC_
CLKO is exported.
It is described, periodic triangular ripple signal V_RC, cyclic pulse signal RC_CLKI, periodic timing signal RC_CLKO
Waveform it is as shown in Figure 9.
Above-described embodiment, has carried out the purpose of the present invention, technical solution and beneficial effect further
Describe in detail, it should be understood that the foregoing is merely the embodiment of the present invention, be not intended to limit the present invention
, protection domain, within the spirit and principles of the invention, any modification, equivalent substitution, improvement and etc. done, should all wrap
It is contained in, within protection scope of the present invention.
Claims (7)
1. a kind of high accuracy adjusts low-power consumption RC oscillators, it is characterised in that including bias current element circuit, discharge and recharge list
First circuit, adjustable reference voltage generating unit circuit, anti-imbalance comparator unit circuit, pulse output unit circuit and clock are whole
Shape output unit circuit；
Bias current circuit, receives external bias voltage signal IREF_LP and shut-off enable signal LP_EN, output bias current
Signal is to charge-discharge circuit, adjustable reference voltage generation circuit, anti-imbalance comparator circuit；
Charge-discharge circuit, receives exterior shut-off enable signal LP_EN, the bias current signal of bias current circuit output, pulse
The cyclic pulse signal of output circuit, the first input end of output triangular signal to anti-imbalance comparator circuit；
Adjustable reference voltage generation circuit, receives external bias voltage signal IREF_LP, the biased electrical that bias current circuit produces
Flow signal, externally input adjusting reference voltage control signal VREF_CTRL, output reference voltage signal to anti-imbalance comparator
Second input terminal of circuit；
Anti- imbalance comparator circuit, receives exterior shut-off enable signal LP_EN, the bias current letter that bias current circuit produces
Number, the reference voltage signal of triangular signal and adjustable reference the voltage generation circuit generation produced to charge-discharge circuit compares
Compared with output periodic swinging control signal to impulse output circuit；
Impulse output circuit, receives the periodic swinging control signal of anti-imbalance comparator circuit output, exports recurrent pulses
Signal is to clock shaping output circuit, charge-discharge circuit；
Clock shaping output circuit, receives exterior shut-off enable signal LP_EN, the cyclic pulse signal of impulse output circuit,
Periodic timing signal RC_CLKO is exported, and feeds back positive and negative clock signal to anti-imbalance comparator circuit, realizes RC oscillators
Output.
A kind of 2. RC oscillators of high-precision low-power consumption according to claim 1, it is characterised in that the bias current list
First circuit includes PMOS tube P1, P2, P3, P4, P5, P6；The source electrode of P1, P2, P3 are connected with power supply, and grid connects and for defeated altogether
The drain electrode for entering external bias voltage signal IREF_LP, P1, P2, P3 is connected with the source electrode of P4, P5, P6 respectively；The grid of P4, P5, P6
Pole, which connects and is used to inputting the drain electrode of shut-off enable signal LP_EN, P4, P5, P6, is respectively used to output bias current signal to filling
Discharge circuit, adjustable reference voltage generation circuit, anti-imbalance comparator circuit.
A kind of 3. RC oscillators of high-precision low-power consumption according to claim 1, it is characterised in that the adjustable reference electricity
N times PMOS tube pair for pressing generation circuit to include 7；Every 7 PMOS tube are to for one group；
Each PMOS tube is to including two PMOS tube；Source electrode of the source electrode of first PMOS tube as PMOS tube pair, grid conduct
The grid of PMOS tube pair, drain electrode are connected with the second PMOS tube source electrode, the drain electrode to drain as PMOS tube pair of the second PMOS tube, the
Control pole of the grid of two PMOS tube as PMOS tube pair；
The source electrode of the PMOS tube pair is connected with power supply, and grid is used to input external bias voltage signal IREF_LP, and control pole is used
Reference voltage control signal VREF_CTRL is adjusted in input；The three, the 4th PMOS tube in each group connect drain electrode, the 5th,
Six, the 7th PMOS tube connect drain electrode；
Resistance is connected between the drain electrode of first, second, third, the 5th PMOS tube pair of each group；First group of the first PMOS tube pair
Drain electrode passes through resistance eutral grounding；Resistance is connected between the drain electrode of every group of the 7th PMOS tube pair and next group of the first PMOS tube pair；
Second input terminal of the drain electrode of 5th PMOS tube pair of end group through resistance output reference voltage signal to anti-imbalance comparator circuit.
4. the RC oscillators of a kind of high-precision low-power consumption according to claim 1, it is characterised in that the anti-imbalance is compared
Device element circuit includes first switch conversion circuit and second switch conversion circuit；The first switch conversion circuit, second open
CLK_CTRL ends, the CLK_CTRLN ends for closing conversion circuit are respectively used to the positive clock letter of input clock shaping output circuit feedback
Number, anticlockwise signal；The first input end of first switch conversion circuit, the second input terminal be respectively used to input triangular signal,
Reference voltage signal；Output terminal Y1, the output terminal Y2 of first switch the conversion circuit grid with NMOS tube N3, NMOS tube N4 respectively
Grid；The source electrode connection of N3, N4, the bias current signal for input bias current circuit output；N3 drain electrodes, the drain electrode of N4
The source electrode with NMOS tube N5, the source electrode of NMOS tube N6 are connected respectively；The gate interconnection of N5, N6, and with second switch conversion circuit
First input end connection, N5 drain electrode, N6 grounded drains；Source electrode, the N6 source electrodes of N5 is defeated with second switch conversion circuit respectively
Outlet Y1, output terminal Y2 connections；Second input terminal of second switch conversion circuit and the grid of PMOS tube P35, NMOS tube N7
The source electrode connection of grid, NMOS tube N8；P35 source electrodes are connected with power supply；The source electrode of N7 is connected with P35 drain electrodes, for exporting the cycle
Property oscillation control signal is to impulse output circuit；N7 drain electrodes, N8 grounded drains；N8 grids are used to input exterior shut-off enable signal
LP_EN。
A kind of 5. RC oscillators of high-precision low-power consumption according to claim 1, it is characterised in that conversion switch bag
Include four on-off circuits；The clock end CLKN of first switch circuit, the clock end CLKN of the 3rd on-off circuit are used for input clock
The positive clock signals of shaping output circuit, the clock end CLKN of second switch circuit, the clock end CLKN of the 4th on-off circuit are used
In the anticlockwise signal of input clock shaping output circuit；First switch circuit is into the 4th on-off circuit, each on-off circuit
Clock end CLK be connected with the clock end CLKN of next on-off circuit；The input terminal of second switch circuit, the 3rd on-off circuit
Input terminal connection, and as the first input end of conversion switch；The input terminal of first switch circuit, the 4th on-off circuit
Input terminal connection, and as the second input terminal of conversion switch；Output terminal, the second switch circuit of first switch circuit
Output terminal connection, and as the output terminal Y1 of conversion switch；The output terminal of 3rd on-off circuit, the 4th on-off circuit
Output terminal connects, and as the output terminal Y2 of conversion switch.
A kind of 6. RC oscillators of high-precision low-power consumption according to claim 1, it is characterised in that the pulse output electricity
Road includes two phase inverters being linked in sequence；The input terminal of first phase inverter is used for the periodicity for inputting anti-imbalance comparator circuit
Oscillation control signal COMP_O, output terminal are used for feedback cycle pulse signal RC_CTRL to charge-discharge circuit；Second phase inverter
Output terminal exports cyclic pulse signal RC_CLKI to clock shaping output circuit.
7. the RC oscillators of a kind of high-precision low-power consumption according to claim 1, it is characterised in that the clock shaping is defeated
Going out circuit includes trigger and phase inverter；The clock end of the trigger is used to input cyclic pulse signal RC_CLKI；Reset
End is used to input shut-off enable signal LP_EN, and output terminal exports positive clock signals to anti-imbalance comparator unit circuit, also through anti-
Phase device exports anticlockwise signal to anti-imbalance comparator unit circuit；The output backward end of trigger is connected with data terminal, and is passed through
Another phase inverter output periodic timing signal RC_CLKO.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610940033.3A CN108011590A (en) | 2016-11-01 | 2016-11-01 | A kind of high-precision low-power consumption RC oscillators |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610940033.3A CN108011590A (en) | 2016-11-01 | 2016-11-01 | A kind of high-precision low-power consumption RC oscillators |
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| CN108011590A true CN108011590A (en) | 2018-05-08 |
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| CN201610940033.3A Withdrawn CN108011590A (en) | 2016-11-01 | 2016-11-01 | A kind of high-precision low-power consumption RC oscillators |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110857890A (en) * | 2018-08-22 | 2020-03-03 | 珠海格力电器股份有限公司 | High-precision temperature detection method and device |
| CN112650092A (en) * | 2020-09-25 | 2021-04-13 | 合肥恒烁半导体有限公司 | Comparator, RC oscillator circuit and MCU chip |
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| CN102790601A (en) * | 2012-08-08 | 2012-11-21 | 电子科技大学 | RC (resistance-capacitance) oscillator |
| CN103499733A (en) * | 2013-09-30 | 2014-01-08 | 中国科学院微电子研究所 | Circuit and method for high-precision voltage detection |
| CN103580649A (en) * | 2012-07-31 | 2014-02-12 | 成都锐成芯微科技有限责任公司 | Low-detuning low-temperature-drift RC oscillator circuit with high power supply rejection ratio |
| CN105703712A (en) * | 2015-12-31 | 2016-06-22 | 峰岹科技（深圳）有限公司 | High-precision RC oscillator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103580649A (en) * | 2012-07-31 | 2014-02-12 | 成都锐成芯微科技有限责任公司 | Low-detuning low-temperature-drift RC oscillator circuit with high power supply rejection ratio |
| CN102790601A (en) * | 2012-08-08 | 2012-11-21 | 电子科技大学 | RC (resistance-capacitance) oscillator |
| CN103499733A (en) * | 2013-09-30 | 2014-01-08 | 中国科学院微电子研究所 | Circuit and method for high-precision voltage detection |
| CN105703712A (en) * | 2015-12-31 | 2016-06-22 | 峰岹科技（深圳）有限公司 | High-precision RC oscillator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110857890A (en) * | 2018-08-22 | 2020-03-03 | 珠海格力电器股份有限公司 | High-precision temperature detection method and device |
| CN112650092A (en) * | 2020-09-25 | 2021-04-13 | 合肥恒烁半导体有限公司 | Comparator, RC oscillator circuit and MCU chip |
| CN112650092B (en) * | 2020-09-25 | 2022-03-18 | 恒烁半导体(合肥)股份有限公司 | Comparator, RC oscillator circuit and MCU chip |
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Application publication date: 20180508 |