CN107437931A - RC relaxors - Google Patents
RC relaxors Download PDFInfo
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- CN107437931A CN107437931A CN201710198179.XA CN201710198179A CN107437931A CN 107437931 A CN107437931 A CN 107437931A CN 201710198179 A CN201710198179 A CN 201710198179A CN 107437931 A CN107437931 A CN 107437931A
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- 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
- H03K3/023—Generators characterised by the type of circuit or by the means used for producing pulses by the use of differential amplifiers or comparators, with internal or external positive feedback
- H03K3/0231—Astable circuits
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- 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
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- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention discloses a kind of RC relaxors, including charge and discharge capacitance C1 and the Digital Logical Circuits that assigned frequency square-wave signal is exported according to charging and discharging currents on charge and discharge capacitance C1, it is characterised in that：Described relaxor also includes charging and discharging currents regulation circuit and voltage reference circuit, the voltage reference circuit connection charging and discharging currents regulation circuit, and the electric current of the charging and discharging currents regulation circuit output carries out discharge and recharge to charge and discharge capacitance C1.Advantages of the present invention is to adjust circuit by charging and discharging currents, in that context it may be convenient to passes through control signal TRIM2 [7:0] frequency of oscillator output square-wave signal is controlled, produces the square-wave signal of assigned frequency；Control signal TRIM1 [7 can be passed through simultaneously:0], SETP, SETN reasonable disposition, influence of the temperature change to charging and discharging currents is eliminated, obtains assigned frequency square-wave signal independent of temperature variations.
Description
Technical field
It is more particularly to a kind of to have and be automatically adjusted according to temperature change the invention belongs to pierce circuit field, keep
Charging and discharging currents stably export the RC relaxors of assigned frequency.
Background technology
The classification of oscillator has many kinds, and one kind is that waveform is different according to caused by oscillator, is generally divided into sine
Wave oscillator and relaxor, wherein, the output waveform of relaxor is rectangle square wave.And the circuit according to oscillator is real
Existing mode is classified, and it is to realize that referred to as RC oscillator, also referred to as RC shake using resistor capacitor circuit to have a kind of circuit realiration
Swing device.
In the electronic technology of early stage, RC oscillators are realized using the charge-discharge circuit of resistance and electric capacity.And
In modern integrated circuits, resistance is usually substituted using current source.The circuits of traditional RC relaxors as shown in figure 1, its
Circuit structure is mainly by constant current source (I1, I2), charge and discharge capacitance C, analog comparator (COMP1, COMP2), rest-set flip-flop
Deng composition.Its operation principle is exactly to carry out discharge and recharge to electric capacity C using constant current, so as to produce impulse waveform.Shaken in relaxation
Swing in device, the voltage VC at electric capacity C both ends compared with the reference voltage VH and VL of comparator COMP1 and COMP2 input, when
During higher than reference voltage VH or less than reference voltage VL, the output state flip of comparator, finally in the output of rest-set flip-flop
Q and QB is held to send out the rectangle square-wave signal of certain frequency.In the case where charging current is constant, electric capacity C both end voltages and charge and discharge
The time linear approximate relationship of electricity, therefore, the time of capacitor charge and discharge can be changed by the setting to charging current, so as to
Change pulsewidth and the cycle of impulse waveform.
RC relaxors it is relatively simple for structure, required power consumption is also smaller, and cost is relatively low, and frequency is easy to adjust, easily
In being integrated into standard CMOS process integrated circuit, using very extensive.But because semiconductor technology is become by supply voltage
Change and the influence of temperature change, the precision of RC relaxor output frequencies can also produce larger deviation, can not meet system
Required precision.If not using inner, constant electric current, but external precision resister is used, then it is higher can to obtain precision
Frequency of oscillation, still, so that the complexity of system can be increased, it can also increase area and cost.The relaxation of prior art
In pierce circuit design, the frequency of outputting oscillation signal can be adjusted by the way of internal resistance electric capacity is adjusted,
But the change of the change and temperature for supply voltage, regulation that still can not be automatic accurate is to stablize output frequency.
The content of the invention
It is contemplated that at least solves one of technical problem present in prior art.Therefore, the present invention provides a kind of RC
Relaxor, it is therefore an objective to improve the stability of relaxor output square-wave signal frequency, can be controlled by control signal
Oscillator exports square-wave signal frequency, produces the square-wave signal of assigned frequency；The reasonable of other control signals can be passed through simultaneously
Configuration, influence of the temperature change to charging and discharging currents is eliminated, obtains assigned frequency square-wave signal independent of temperature variations.
To achieve these goals, the technical scheme taken of the present invention is：A kind of RC relaxors, including discharge and recharge electricity
Hold C1 and the Digital Logical Circuits of assigned frequency square-wave signal, its feature are exported according to charging and discharging currents on charge and discharge capacitance C1
It is：Described relaxor also includes charging and discharging currents regulation circuit and voltage reference circuit, the voltage reference circuit
Charging and discharging currents regulation circuit is connected, the electric current of the charging and discharging currents regulation circuit output carries out charge and discharge to charge and discharge capacitance C1
Electricity.
Charging and discharging currents regulation circuit include semifixed resistor R3, semifixed resistor R4, amplifier, transistor M4, M5,
M6, M7, M8, M9, M10, M11, M12, M13, M14, M15 and M18, the reference voltage signal of the voltage reference circuit output
VREF is input to the negative input end of amplifier, the output end connection transistor M12 of amplifier grid, transistor M12 source electrode
The positive input terminal of amplifier and semifixed resistor R4 one end, semifixed resistor R4 other end ground connection, semifixed resistor R4 are connected respectively
Control signal input control signal TRIM2 [7:0] to adjust semifixed resistor R4 resistance, transistor M12 drain electrode connects
Transistor M11 drain electrode, transistor M11 source electrode connection power vd D, transistor M11 grid connect transistor M11's respectively
The grid of drain electrode, transistor M13 grid and transistor M15, transistor M13 source electrode, M15 source electrode are all connected with power vd D,
Transistor M13 drain electrode connects transistor M8 drain electrode, transistor M9 drain electrode, transistor M14 drain electrode, transistor respectively
M14 grid connection transistor M18 grid, transistor M14 drain electrode are connected with its grid, transistor M18 and transistor M14
Source grounding；Transistor M8 source electrode connects with transistor M7 drain electrodes, transistor M7 source electrodes connection power vd D, transistor
M7 gate input control signal SETP, transistor M8 grid connect transistor M6 grid and drain electrode, transistor M6 respectively
Source electrode connection power vd D, transistor M6 drain electrode is connected with transistor M19 drain electrode, transistor M19 source ground, crystalline substance
Body pipe M19 grid connects the grid of transistor M5 grid, transistor M5 drain electrode and transistor M9, transistor M9 sources respectively
Pole is connected with transistor M10 drain electrode, transistor M10 source ground, transistor M10 gate input control signal SETN,
Transistor M5 source ground, transistor M5 drain electrode are connected with M4 drain electrode, and transistor M4 source electrode passes through semifixed resistor R3
It is connected with power vd D, the control signal input control signal TRIM1 [7 of semifixed resistor:0], transistor M15 drain current
Charging current is provided for electric capacity C1 through first switch, transistor M18 drain current provides electric discharge through second switch for electric capacity C1
Electric current.
Described semifixed resistor R3 and semifixed resistor R4 is solid relay.
Described Digital Logical Circuits includes comparator COMP1, comparator COMP2, rest-set flip-flop, not circuit, described
The voltage at charge and discharge capacitance C1 both ends be separately input to comparator COMP1 positive input terminal and comparator COMP2 negative input
End, comparator COMP1 negative input end and comparator COMP2 positive input terminal difference input reference voltage VH and reference voltage
VL, comparator COMP1 output end and comparator COMP2 output end are separately input to the S pins and R pins of rest-set flip-flop,
The Q output of rest-set flip-flop exports square-wave signal CLK by not circuit, and the Q output signal of rest-set flip-flop is input to second
Switch, the QB output signals of rest-set flip-flop are connected with first switch.
The first switch, second switch are respectively transistor M16, transistor M17, and transistor M15 drain electrode connection is brilliant
Body pipe M16 source electrode, transistor M16 grid and the QB pins of rest-set flip-flop connect, and transistor M16 drain electrode connects crystalline substance respectively
Body pipe M17 drain electrode and charge and discharge capacitance C1 one end, charge and discharge capacitance C1 other end ground connection, transistor M17 source electrode connect
Connect transistor M18 drain electrode, the Q pin output end of transistor M17 grid connection rest-set flip-flop.
Described voltage reference circuit includes transistor M1, transistor M2, transistor M3, simulation amplifier, bipolar transistor
Pipe Q1, bipolar transistor Q2, bipolar transistor Q3, transistor M1, M2, M3 source electrode are all connected with power vd D, transistor M1
Drain electrode connect bipolar transistor Q1 emitter stage and the inverting input of simulation amplifier respectively, Q1 base stage and colelctor electrode connect
Ground；Transistor M2 drain electrode is connected, by resistance R1's and bipolar transistor Q2 with simulating the in-phase input end of amplifier respectively
Emitter stage connects, Q2 base stage and grounded collector；Transistor M3 drain electrode passes through resistance R2 connection bipolar transistors Q3's
The base stage and grounded collector of emitter stage, bipolar transistor Q3, the output end for simulating amplifier connect transistor M1 grid respectively
Pole, M2 grid, M3 grid, M4 grid, transistor M3 drain electrode output reference voltage VREF.
Advantages of the present invention is to adjust circuit by charging and discharging currents, in that context it may be convenient to passes through control signal TRIM2 [7:0]
The frequency of oscillator output square-wave signal is controlled, the square-wave signal of assigned frequency can be produced；Control signal can be passed through simultaneously
TRIM1[7:0], SETP, SETN reasonable disposition, eliminates influence of the temperature change to charging and discharging currents, and acquisition is not become by temperature
Change the assigned frequency square-wave signal influenceed.
Brief description of the drawings
This specification includes the following drawings, and shown content is respectively：
Fig. 1 is the schematic diagram of RC relaxors in the prior art；
Fig. 2 is the circuit theory diagrams of the RC relaxors of the present invention.
Embodiment
Below against accompanying drawing, by the description to embodiment, embodiment of the invention is made further details of
Explanation, it is therefore an objective to help those skilled in the art to have more complete, accurate and deep reason to design of the invention, technical scheme
Solution, and contribute to its implementation.
A kind of RC relaxors, including charge and discharge capacitance C1 and exported according to charging and discharging currents on charge and discharge capacitance C1
The Digital Logical Circuits of assigned frequency square-wave signal, relaxor also include charging and discharging currents regulation circuit and voltage reference electricity
Road, voltage reference circuit connection charging and discharging currents regulation circuit, the electric current of charging and discharging currents regulation circuit output is to discharge and recharge electricity
Hold C1 and carry out discharge and recharge.Voltage reference circuit adjusts circuit for discharge and recharge and provides reference voltage V REF, charging and discharging currents regulation electricity
Road can adjust the size of charging and discharging currents, and the time that different charging and discharging currents sizes carries out discharge and recharge to electric capacity C1 is different,
And then change the frequency of the square-wave signal of output.
The built-up circuit of oscillator is described further with reference to Fig. 2.
Charging and discharging currents regulation circuit include semifixed resistor R3, semifixed resistor R4, amplifier, transistor M4, M5, M6, M7,
M8, M9, M10, M11, M12, M13, M14, M15 and M18, semifixed resistor R3 and semifixed resistor R4 are solid relay.Voltage
The reference voltage signal VREF of reference circuit output is input to the inverting input of amplifier, the output end connection crystal of amplifier
Pipe M12 grid, transistor M12 source electrode connect the in-phase input end of amplifier and semifixed resistor R4 one end respectively, fine setting
Resistance R4 other end ground connection, semifixed resistor R4 control signal input control signal TRIM2 [7:0] to adjust semifixed resistor
R4 resistance, transistor M12 drain electrode connection transistor M11 drain electrode, transistor M11 source electrode connection power vd D, transistor
M11 grid connects the grid of transistor M11 drain electrode, transistor M13 grid and transistor M15 respectively, transistor M13's
Source electrode, M15 source electrode are all connected with power vd D, and transistor M13 drain electrode connects transistor M8 drain electrode, transistor M9 respectively
Drain electrode, transistor M14 drain electrode, transistor M14 grid connection transistor M18 grid, transistor M14 drain electrode and its grid
Pole connects, transistor M18 and transistor M14 source grounding；Transistor M8 source electrode connects with transistor M7 drain electrodes, crystal
Pipe M7 source electrodes connect power vd D, transistor M7 gate input control signal SETP, and transistor M8 grid connects crystal respectively
Pipe M6 grid and drain electrode, transistor M6 source electrode connection power vd D, transistor M6 drain electrode and transistor M19 drain electrode connect
Connect, transistor M19 source ground, transistor M19 grid connect respectively transistor M5 grid, transistor M5 drain electrode and
Transistor M9 grid, transistor M9 source electrodes are connected with transistor M10 drain electrode, transistor M10 source ground, transistor
M10 gate input control signal SETN, transistor M5 source ground, transistor M5 drain electrode are connected with M4 drain electrode, brilliant
Body pipe M4 source electrode is connected by semifixed resistor R3 with power vd D, the control signal input control signal TRIM1 of semifixed resistor
[7:0], transistor M15 drain current provides charging current, transistor M18 drain electrode electricity through first switch M16 for electric capacity C1
Flow through second switch M17 and provide discharge current for electric capacity C1.
Digital Logical Circuits includes comparator COMP1, comparator COMP2, rest-set flip-flop, not circuit, charge and discharge capacitance
The voltage at C1 both ends is separately input to comparator COMP1 positive input terminal and comparator COMP2 negative input end, comparator
COMP1 negative input end and comparator COMP2 positive input terminal difference input reference voltage VH and reference voltage VL, comparator
COMP1 output end and comparator COMP2 output end are separately input to the R leads ends S pins and R pins of rest-set flip-flop, RS
The Q output of trigger exports square-wave signal CLK by not circuit, and the Q output signal of rest-set flip-flop is input to second and opened
Close M17, the QB output signals of rest-set flip-flop are connected with first switch M16.
First switch, second switch are respectively transistor M16, transistor M17, and transistor M15 drain electrode connects transistor
M16 source electrode, transistor M16 grid and the QB pins of rest-set flip-flop connect, and transistor M16 drain electrode connects transistor respectively
M17 drain electrode and charge and discharge capacitance C1 one end, charge and discharge capacitance C1 other end ground connection, transistor M17 source electrode connection are brilliant
Body pipe M18 drain electrode, the Q pin output end of transistor M17 grid connection rest-set flip-flop.
Voltage reference circuit includes transistor M1, transistor M2, transistor M3, simulation amplifier, bipolar transistor Q1, double
Bipolar transistor Q2, bipolar transistor Q3, transistor M1, M2, M3 source electrode are all connected with power vd D, transistor M1 drain electrode
Bipolar transistor Q1 emitter stage and the negative input end of amplifier, Q1 base stage and grounded collector are connected respectively；Transistor
M2 drain electrode is connected with simulating the in-phase input end of amplifier, connected by resistance R1 and bipolar transistor Q2 emitter stage respectively
Connect, Q2 base stage and grounded collector；Transistor M3 drain electrode passes through resistance R2 connection bipolar transistors Q3 emitter stage, double
Bipolar transistor Q3 base stage and grounded collector, the output end for simulating amplifier connect transistor M1 grid, M2 grid respectively
Pole, M3 grid, M4 grid, transistor M3 drain electrode output reference voltage VREF.
Charging current of the transistor M15 drain current as charging and discharging currents C1, transistor M18 drain current conduct
Electric capacity C1 discharge current.Transistor M15 and transistor M11 composition mirror image circuits, transistor M15 drain current is by transistor
M11 drain electrode mirror image obtains, and transistor M11 drain current is relevant with the input signal VREF of semifixed resistor R4 and amplifier,
I.e. electric capacity C1 charging current is relevant with reference voltage V REF and semifixed resistor R4 that voltage reference circuit exports, and semifixed resistor is
Solid relay, it inputs control signal TRIM2 [7:0] it is used for the size for controlling semifixed resistor R4, so as to adjust charging electricity
Stream.
Transistor M18 drain current is obtained by transistor M14 drain current mirror image, transistor M14 drain current
It is made up of three parts：Transistor M13 drain current, transistor M8 drain current, transistor M9 drain current, transistor
M14 drain currents are subtracted transistor M9 drain current by transistor M13 drain current superposition transistor M8 drain current again.
Transistor M13 drain current is obtained by transistor M11 drain current mirror image, in the case where charging current is constant, i.e. M11
The constant i.e. semifixed resistor R4 and reference voltage V REF of input of drain current it is constant, discharge current only with M8 drain current with
And M9 drain current is related.When transistor M8 drain current increase, discharge current increase；When M9 drain current increases
When, discharge current can be reduced.Transistor M8 and transistor M6 composition current mirror circuits, and transistor M7 is to transistor M8's
Drain current compensates, therefore M8 drain currents and M6 drain and transistor M7 is related, M6 drain current by M5 with
It is related to transistor M4 drain current after the current mirror circuit of M19 compositions, similarly M9 drain current and transistor M10 with
And M4 drain currents are related, transistor M4 drain current is controlled by semifixed resistor R3, when semifixed resistor R3 increases, M4 electric currents
Reduce.Therefore M8, M9 drain current are relevant with semifixed resistor R3, and M8 is also relevant with M7, when M7 input control signal
When SETP is high level, transistor M7 is closed, and disconnects transistor M8 drain electrode compensation electric current, M9 is also related to M10, when M10's
When input control signal SETN is low level, transistor M10 is closed, and disconnects M9 drain electrode compensation electric current.
Therefore, input control signal SETN, the semifixed resistor R3 of discharge current and M7 input control signal SETP, M10
Control signal TRIM1 [7:0] relevant, charging current is relevant with voltage reference signal VREF with semifixed resistor R4.
When needing to export the frequency of different frequency square wave or fine setting output square wave, TRIM2 [7 can be passed through:0] adjust
Semifixed resistor R4 size is saved, so as to adjust the size of charging current, and then adjusts or finely tunes the frequency of output square wave, reach tune
The purpose of perfect square ripple output frequency, increase the pierce circuit frequency tunability, when there is process deviation, can adjust output side
Wave frequency rate is to assigned frequency.
When at normal temperatures, such as 25 DEG C, control signal STEN is arranged to low level, and control signal STEP is arranged to high level,
Pass through TRIM2 [7:0] configuration adjustment charging current, so as to control the output frequency of oscillator so that oscillator output frequency
Rate is consistent with design expected frequency.In temperature change, then need to adjust control signal SETN, SETP, TRIM1 [7 accordingly:
0] to produce the discharge current varied with temperature, so as to be influenceed caused by compensation temperature change, and then stable output signal
Frequency.When actually using oscillator, as the output frequency of fruit chip raises with temperature and the change of positive temperature coefficient is presented, then
The discharge current of one negative temperature coefficient of generation can be passed through, it is possible to pass through the reduction of discharge current, reduce electric capacity electric discharge speed
Degree, offset the change of frequency of oscillation that the positive temperature coefficient of script circuit is brought.In temperature change, if output frequency is with temperature
Raising if increase, STEN is now configured to high level, M10 conductings, M9 drain current is the electric current of positive temperature coefficient,
So M14 drain current is the drain current that initial drain subtracts M9 so that discharge current with temperature raise and
Reduce, frequency reduces；If output frequency is raised and reduced with temperature, STEP is now configured to low level, M7 conductings, M8 leakage
Pole is also the electric current of positive temperature coefficient, and M8 electric current is added with M13 electric current, flows into M14, forms what is raised and increase with temperature
Electric current is compensated, so as to increase discharge current, the final frequency rise for causing outputting oscillation signal.The temperature coefficient of discharge current,
By control signal TRIM1 [7:0] control the size of semifixed resistor to be realized to control, pass through control signal TRIM1 [7:0], control
Signal SETN, STEP control the size of the temperature coefficient of discharge current, and so as to realizing under temperature change, compensation electric current produces
The discharge current varied with temperature, and then the purpose of the output frequency of stabilized oscillator.
Using the RC relaxors of foregoing circuit, its output frequency can be adjusted or finely tuned according to the demand of reality output
Output frequency, its adjusting method are the size by adjusting semifixed resistor R4, can be according to control because R4 is solid relay
Signal TRIM2 [7:0] big minor adjustment R4 size, realize that oscillator exports different frequencies.In real work, due to ring
The change of square wave frequency is exported caused by the change of border temperature, can be by adjusting control signal SETN, SETP, TRIM1 [7:0]
The characteristic for increasing or reducing to adjust discharge current with temperature, when temperature changes, compensation circuit produces putting with temperature increase
When electric current or the discharge current reduced with temperature carry out compensation temperature change, the change of output frequency, so as to stable output square wave
Frequency.
The present invention is exemplarily described above in association with accompanying drawing.Obviously, present invention specific implementation is not by above-mentioned side
The limitation of formula.As long as employ the improvement of the various unsubstantialities of inventive concept and technical scheme of the present invention progress；Or not
It is improved, the above-mentioned design of the present invention and technical scheme are directly applied into other occasions, in protection scope of the present invention
Within.
Claims (6)
1.RC relaxors, including charge and discharge capacitance C1 and according on charge and discharge capacitance C1 charging and discharging currents export specify frequency
The Digital Logical Circuits of rate square-wave signal, it is characterised in that：Described relaxor also includes charging and discharging currents regulation circuit
And voltage reference circuit, the voltage reference circuit connection charging and discharging currents regulation circuit, the charging and discharging currents adjust circuit
The electric current of output carries out discharge and recharge to charge and discharge capacitance C1.
2. RC relaxors as claimed in claim 1, it is characterised in that：The charging and discharging currents regulation circuit includes fine setting
Resistance R3, semifixed resistor R4, amplifier, transistor M4, M5, M6, M7, M8, M9, M10, M11, M12, M13, M14, M15 and
M18, the reference voltage signal VREF of the voltage reference circuit output are input to the negative input end of amplifier, the output of amplifier
End connection transistor M12 grid, transistor M12 source electrode connect respectively amplifier positive input terminal and semifixed resistor R4 one
End, semifixed resistor R4 other end ground connection, semifixed resistor R4 control signal input control signal TRIM2 [7:0] with regulation
Semifixed resistor R4 resistance, transistor M12 drain electrode connection transistor M11 drain electrode, transistor M11 source electrode connection power supply
VDD, transistor M11 grid connect the grid of transistor M11 drain electrode, transistor M13 grid and transistor M15 respectively,
Transistor M13 source electrode, M15 source electrode are all connected with power vd D, transistor M13 drain electrode connect respectively transistor M8 drain electrode,
Transistor M9 drain electrode, transistor M14 drain electrode, transistor M14 grid connection transistor M18 grid, transistor M14's
Drain electrode is connected with its grid, transistor M18 and transistor M14 source grounding；Transistor M8 source electrode leaks with transistor M7
Pole connects, and transistor M7 source electrodes connect power vd D, transistor M7 gate input control signal SETP, transistor M8 grid
Transistor M6 grid and drain electrode, transistor M6 source electrode connection power vd D, transistor M6 drain electrode and transistor are connected respectively
M19 drain electrode connection, transistor M19 source ground, transistor M19 grid connect transistor M5 grid, crystal respectively
Pipe M5 drain electrode and transistor M9 grid, transistor M9 source electrodes are connected with transistor M10 drain electrode, transistor M10 source electrode
Ground connection, transistor M10 gate input control signal SETN, transistor M5 source ground, transistor M5 drain electrode is with M4's
Drain electrode connection, transistor M4 source electrode are connected by semifixed resistor R3 with power vd D, the control signal input control of semifixed resistor
Signal TRIM1 [7 processed:0], transistor M15 drain current provides charging current, transistor M18 through first switch for electric capacity C1
Drain current provide discharge current through second switch for electric capacity C1.
3. RC relaxors as claimed in claim 2, it is characterised in that：Described semifixed resistor R3 and semifixed resistor R4 be
Solid relay.
4. RC relaxors as claimed in claim 2, it is characterised in that：Described Digital Logical Circuits includes comparator
COMP1, comparator COMP2, rest-set flip-flop, not circuit, the voltage at described charge and discharge capacitance C1 both ends are separately input to compare
The negative input end of positive input terminal and comparator COMP2 compared with device COMP1, comparator COMP1 negative input end and comparator COMP2
Positive input terminal difference input reference voltage VH and reference voltage VL, comparator COMP1 output end and comparator COMP2's is defeated
Go out S pins and R pins that end is separately input to rest-set flip-flop, the Q output of rest-set flip-flop exports square wave by not circuit to be believed
Number CLK, the Q output signal of rest-set flip-flop is input to second switch, the QB output signals of rest-set flip-flop are connected with first switch.
5. RC relaxors as claimed in claim 4, it is characterised in that：The first switch, second switch are respectively crystalline substance
Body pipe M16, transistor M17, transistor M15 drain electrode connection transistor M16 source electrode, transistor M16 grid and RS are triggered
The QB pins connection of device, transistor M16 drain electrode connect transistor M17 drain electrode and charge and discharge capacitance C1 one end, filled respectively
Discharge capacity C1 other end ground connection, transistor M17 source electrode connection transistor M18 drain electrode, transistor M17 grid connection
The Q pin output end of rest-set flip-flop.
6. RC relaxors as claimed in claim 2, it is characterised in that：Described voltage reference circuit includes transistor
M1, transistor M2, transistor M3, simulation amplifier, bipolar transistor Q1, bipolar transistor Q2, bipolar transistor Q3, it is brilliant
Body pipe M1, M2, M3 source electrode are all connected with power vd D, and transistor M1 drain electrode connects bipolar transistor Q1 emitter stage respectively
With the inverting input of simulation amplifier, Q1 base stage and grounded collector；Transistor M2 drain electrode is same with simulation amplifier respectively
Phase input is connected, is connected by resistance R1 with bipolar transistor Q2 emitter stage, Q2 base stage and grounded collector；Crystal
Pipe M3 drain electrode is connect by resistance R2 connection bipolar transistors Q3 emitter stage, bipolar transistor Q3 base stage and colelctor electrode
Ground, the output end for simulating amplifier connect transistor M1 grid, M2 grid, M3 grid, M4 grid, transistor M3 respectively
Drain electrode output reference voltage VREF.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109951155A (en) * | 2018-12-17 | 2019-06-28 | 深圳芯珑电子技术有限公司 | A kind of built-in oscillator compensated |
| CN112152591A (en) * | 2020-09-29 | 2020-12-29 | 北京欧铼德微电子技术有限公司 | Relaxation oscillator and electronic device |
| CN112953465A (en) * | 2021-03-09 | 2021-06-11 | 天津大学 | Configurable relaxation oscillator based on resistance-capacitance array |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109951155A (en) * | 2018-12-17 | 2019-06-28 | 深圳芯珑电子技术有限公司 | A kind of built-in oscillator compensated |
| CN112152591A (en) * | 2020-09-29 | 2020-12-29 | 北京欧铼德微电子技术有限公司 | Relaxation oscillator and electronic device |
| CN112152591B (en) * | 2020-09-29 | 2024-03-12 | 北京欧铼德微电子技术有限公司 | Relaxation oscillator and electronic device |
| CN112953465A (en) * | 2021-03-09 | 2021-06-11 | 天津大学 | Configurable relaxation oscillator based on resistance-capacitance array |
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