CN105429611B - A kind of high precision clock generator unrelated with power supply and temperature - Google Patents
A kind of high precision clock generator unrelated with power supply and temperature Download PDFInfo
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- CN105429611B CN105429611B CN201510988849.9A CN201510988849A CN105429611B CN 105429611 B CN105429611 B CN 105429611B CN 201510988849 A CN201510988849 A CN 201510988849A CN 105429611 B CN105429611 B CN 105429611B
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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
-
- 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
- H03K3/26—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback
- H03K3/28—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback
- H03K3/281—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator
- H03K3/282—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator astable
- H03K3/2821—Emitters connected to one another by using a capacitor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Semiconductor Integrated Circuits (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of high precision clock generators unrelated with power supply and temperature, it is made of two charge and discharge electric network sum number word trigger processing modules, two charge and discharge electric networks are in charging, discharge condition in turn, and according to its charging and discharging state output switching activity signal in turn, digital trigger processing module controls described two charge and discharge electric networks respectively in turn in charging, discharge condition according to energizing signal, exports clock signal according to the charging of described two charge and discharge electric networks, discharge condition.Keep the clock generator unrelated with power supply and temperature change by the charge/discharge unit that the opposite charge and discharge resistive module of temperature coefficient and charge and discharge capacitance module form, it is not easy to be affected by the external environment, and each period can be integrated in chip interior, matching is good, achievees the purpose that high precision clock generator.
Description
Technical field
The present invention relates to a kind of clock generator, especially a kind of high precision clock unrelated with power supply and temperature occurs
Device.
Background technique
With the development of semiconductor integrated circuit, various communication systems are developed rapidly, between system and system, system
Communication between internal module requires clock, and in order to make communication system not conflict, country has put into effect various standards, and to carry out specification various
The clock of system, while in order to keep communication accurate, the system of requiring has high-precision clock.However, in general integrated circuit
The clock frequency of clock generator output can change with the variation of power supply and temperature, and deviation is bigger, precision is inadequate
Height, usual deviation is in (20%) left and right.Such precision is no longer satisfied requirement of some systems to clock.In addition, due to
The deviation of integrated circuit technology is larger, is all the additional High Precision Crystal Oscillator of chip exterior in most cases, to make system clock
Reach accurate.By the working principle of crystal oscillator it is found that additional crystal oscillator while can introduce capacitance component outside piece,
It is matching that it is also required to chip interior modular circuit simultaneously, it could starting of oscillation；And the frequency of general crystal oscillator is lower, needs frequency multiplication electric
Road or PLL circuit can just obtain desired clock frequency.In addition to this, crystal oscillator and the outer capacitor of piece will increase system area, shadow
Integrated level is rung, and will increase cost；Internal frequency multiplier circuit or PLL circuit acquire a certain degree of difficulty, and the matching outside piece inner sheet
Property is bad, if system layout is bad, vulnerable to interference, influences the precision of clock.
Summary of the invention
To solve the above problems, the purpose of the present invention is to provide a kind of high precision clock hairs unrelated with power supply and temperature
Raw device.Technical solution used by the present invention solves the problems, such as it is:
A kind of high precision clock generator unrelated with power supply and temperature, comprising:
Charge and discharge electric network, there are two settings, and described two charge and discharge electric networks are in charging, discharge condition in turn respectively, and
According to its charging and discharging state, output switching activity signal, the charging time of described two charge and discharge electric networks are identical in turn；The charge and discharge
Network includes the RC charge/discharge unit within a specified time completing charging, and the RC charge/discharge unit is filled by temperature coefficient is opposite
Discharge resistance module and charge and discharge capacitance module composition；Digital trigger processing module controls described two according to energizing signal
Charge and discharge electric network in turn in charging, discharge condition, exports respectively according to the charging of described two charge and discharge electric networks, discharge condition
Clock signal.The digital trigger processing module is that the clock generator generates needed for accurate 50% duty cycle clock signal
The digital control logic wanted.
Further, the charge and discharge electric network further includes for controlling the charge switch and be used for that RC charge/discharge unit charges
The discharge switch of RC charge/discharge unit electric discharge is controlled, the RC charge/discharge unit further includes a charging voltage output end, described
Charging voltage output end is placed among the charge and discharge resistive module and the charge and discharge capacitance module.
Further, the charge and discharge electric network further includes comparator, and the comparator includes for connecting VA reference voltage
Reference voltage input terminal and comparison voltage input terminal for connecting RC charge/discharge unit charging voltage output end；The comparison
Device is by comparing RC charge/discharge unit charging voltage and VA reference voltage output energizing signal, when the RC charge/discharge unit charges
When voltage and equal VA reference voltage, the comparator output switching activity signal；The input terminal of the digital trigger processing module
It is connected to the network respectively with described two charge and discharge and obtains its energizing signal, the digital trigger processing module further includes two and opens
Close control output end, the charge switch of two switch control output ends difference one of charge and discharge electric network of cross-over control
With the discharge switch of another charge and discharge electric network, the digital trigger processing module according to energizing signal, alternately open by switching two
The control signal for closing control output end makes two charge and discharge electric networks alternately be in charged state and discharge condition, according to charge and discharge
State, the clock signal are exported from the clock signal output terminal of the digital trigger processing module.
Further, the charge and discharge electric network further includes input supply voltage port and ground port, the input power electricity
Pressure side mouth, charge switch, charge/discharge unit and ground port are sequentially connected in series, and the discharge switch is arranged in parallel in charge and discharge electricity
The both ends of molar block, the charging voltage output end are set between charge and discharge resistive module and charge and discharge capacitance module.
Further, further include VA generating circuit from reference voltage, the input supply voltage port, two divider resistances and
Ground port is sequentially connected in series, the resistor coupled in parallel of electric capacity of voltage regulation and ground connection, and the VA reference voltage input terminal is set to two partial pressure electricity
Between resistance, the VA reference voltage generates 1/2 Vdd input supply voltage.
Further, the charge and discharge resistive module is composed in series by more than two resistance, and the resistance is negative temperature
Coefficient resistance, each resistance are provided with resistance control switch connected in parallel；The charge and discharge capacitance module is by two
Above capacitor composes in parallel, and the capacitor is positive temperature coefficient capacitor, and each capacitor is provided with the electricity of series connection with it
Hold control switch.Each its resistance value of concatenated resistance is successively incremented by series in the charge and discharge resistive module, the charge and discharge
Its capacitance of the capacitor of each parallel connection is successively incremented by series in capacitance module.Further include register, connects the charge and discharge resistance
Module, each resistance control switch of charge and discharge capacitance module and capacitance controlled switches.The resistance of the charge and discharge resistive module
The capacitance of value and charge and discharge capacitance module is by configuration register come adjusting size and its precision.
Because of the π RC of charging time t=2 of the charge and discharge electric network, by adjusting the resistance value of the charge and discharge resistive module
The charging time of the charge and discharge electric network can be determined without being influenced by supply voltage with the capacitance of charge and discharge capacitance module；Separately
Outside, the resistance value of the charge and discharge resistive module and the capacitance of charge and discharge capacitance module are designed, so that their product is certain, temperature
Degree coefficient is cancelled out each other, so that the clock size that clock generator generates is temperature independent.
Further, the charge and discharge electric network further includes test switch and test input current source, the test input
Electric current source, test switch are sequentially connected in series with the charge/discharge unit.After the completion of clock generator production, according to
Lower method trims the charge and discharge electric network: first adjusting the charge and discharge resistive module, then adjusts the charge and discharge capacitance module.It repairs
When adjusting the charge and discharge resistive module, the charge switch is disconnected, is closed the test switch and the discharge switch, the survey
Input current source additional constant current is tried, the voltage of the electric current source is tested, the value by configuring the register changes institute
The resistance value for stating charge and discharge resistive module makes the voltage of the test electric current source reach setting value, to determine charge and discharge resistive mode
The resistance value of block configures the value of the register then according to the signal of the clock signal output terminal, trims the charge and discharge electricity
The capacitance of molar block.It is unrelated with power supply and temperature by the clock signal trimmed, at subzero 40 degrees Celsius to 85 degrees Celsius
In range, precision is even higher up to 0.5%.
Compared with prior art, the invention has the following advantages that a kind of negative temperature coefficient resister that the present invention uses and just
The zero-temperature coefficient RC charging clock structure of the capacitor composition of temperature coefficient, each device can be integrated in chip interior, match
Property it is good, not vulnerable to outer signals interfere, after trimming calibration, clock size is unrelated with power supply and temperature change, not vulnerable to outer
Boundary's environment influences, and has accomplished real high-precision, has existing other unrivaled technical advantages of clock generator.
Detailed description of the invention
The invention will be further described with example with reference to the accompanying drawing.
Fig. 1 is a kind of circuit structure diagram of the high precision clock generator unrelated with power supply and temperature of the present invention；
Fig. 2 is a kind of charge and discharge of the configurable size of the high precision clock generator unrelated with power supply and temperature of the present invention
The structural schematic diagram of resistive module；
Fig. 3 is a kind of charge and discharge of the configurable size of the high precision clock generator unrelated with power supply and temperature of the present invention
The structural schematic diagram of capacitance module capacitor；
Fig. 4 is a kind of VA generating circuit from reference voltage of the high precision clock generator unrelated with power supply and temperature of the present invention
Structural schematic diagram.
Specific embodiment
- Fig. 4 referring to Fig.1, a kind of and power supply of the invention and the unrelated high precision clock generator of temperature, feature exist
In, comprising:
Charge and discharge electric network 2, there are two settings, and described two charge and discharge electric networks 2 are in charging, discharge condition in turn respectively,
And output switching activity signal, the charging time of described two charge and discharge electric networks 2 are identical in turn according to its charging and discharging state；The charge and discharge
Electric network 2 includes the RC charge/discharge unit 1 within a specified time completing charging, and the RC charge/discharge unit 1 is by temperature coefficient phase
Anti- charge and discharge resistive module 4 and charge and discharge capacitance module 5 form；
Digital trigger processing module 3 controls described two charge and discharge electric networks 2 and is in turn respectively and fills according to energizing signal
Electricity, discharge condition export clock signal according to the charging of described two charge and discharge electric networks 2, discharge condition.
Further, the charge and discharge electric network 2 further includes the charge switch K1/ for controlling the charging of RC charge/discharge unit 1
The K4 and discharge switch K3/K6 to discharge for controlling RC charge/discharge unit 1, the RC charge/discharge unit 1 further include a charging
Voltage output end VB/VC, the charging voltage output end VB/VC are placed in the charge and discharge resistive module 4 and the charge and discharge
Among capacitance module 5.
Further, the charge and discharge electric network 2 further includes comparator, and the comparator includes for connecting VA reference voltage
Reference voltage input terminal and comparison voltage input terminal for connecting 1 charging voltage output end VB/VC of RC charge/discharge unit, institute
Comparator is stated by comparing 1 charging voltage VB/VC and VA reference voltage output energizing signal of RC charge/discharge unit.
Further, the input terminal of the digital trigger processing module 3 is connect with described two charge and discharge electric networks 2 respectively
Its energizing signal is obtained, the digital trigger processing module 3 further includes two switch controls output end ctrl1, ctrl2, institute
The switch control output end ctrl1 stated controls the charge switch K1 and discharge switch K6, the switch control output end
Ctrl2 controls the charge switch K4 and discharge switch K3；When charge switch K1 and discharge switch K6 are closed, and discharge switch K3
When disconnecting with charge switch K4, the RC charging network 2 of side charges, when charging voltage output end VB voltage reaches VA reference voltage
When value, the side comparator output switching activity, and then the digital trigger processing module 3 according to energizing signal, alternately open by switching two
Close control output end ctrl1, ctrl2 control signal so that discharge switch K3 and charge switch K4 closure, charge switch K1 and
Discharge switch K6 is disconnected, and other side RC charging network 2 charges, when the voltage of charging voltage output end VC reaches VA reference voltage value
When, other side comparator output switching activity, and then it is closed charge switch K1 and discharge switch K6, discharge switch K3 and charge switch
K4 is disconnected, and thus makes two charge and discharge electric networks 2 alternately in charged state and discharge condition, according to charging and discharging state, when described
Clock signal is exported from the clock signal output terminal clk of the digital trigger processing module 3, thus generates clock.
Further, further include input supply voltage port Vdd and ground port, the input supply voltage port Vdd, fill
Electric switch K1/K4, charge/discharge unit 1 and ground port are sequentially connected in series, and the discharge switch K3/K6 is arranged in parallel in charge and discharge
The both ends of capacitance module 5, the charging voltage output end are set between charge and discharge resistive module 4 and charge and discharge capacitance module 5.
It further, further include VA generating circuit from reference voltage 6, the input supply voltage port Vdd, two partial pressure electricity
Resistance R1, R2 and ground port are sequentially connected in series, and electric capacity of voltage regulation C1 is in parallel with the divider resistance R2 of ground connection, the VA reference voltage input terminal
It is set between two divider resistances R1, R2, the VA generating circuit from reference voltage 6 generates 1/2 input supply voltage Vdd.
Further, the charge and discharge resistive module 4 is composed in series by more than two resistance R, and the resistance R is subzero temperature
Coefficient resistance is spent, each resistance R is provided with resistance control switch K connected in parallel；The charge and discharge capacitance module 5 by
More than two capacitor C are composed in parallel, and the capacitor C is positive temperature coefficient capacitor, and each capacitor C is provided with to go here and there with it
The capacitance controlled switches K ' of connection.In another embodiment, the resistance is positive temperature coefficient resistor, and the capacitor is negative temperature
Coefficient capacitor.
Further, each concatenated its resistance value of resistance R is successively incremented by series in the charge and discharge resistive module 4, institute
It states its capacitance of the capacitor C of each parallel connection in charge and discharge capacitance module 5 to be successively incremented by series, series is incremented by setting and adjusts convenient for improving
Save the accuracy of the charge and discharge resistive module resistance value and charge and discharge capacitance module capacitance value.Register is additionally included, is connected
The each resistance control switch K and capacitance controlled switches K ' of the charge and discharge resistive module 4, charge and discharge capacitance module 5.By matching
The value for setting register adjusts the big of the resistance value of the charge and discharge resistive module 4 and the capacitance of the charge and discharge capacitance module 5
Small, the precision of adjusting is determined by the digit of register.
According to the π of charging time t=2 RC of RC charge and discharge electric network 2, the clock speed that the clock generator generates can lead to
The value of the resistance R and capacitor C of the charge and discharge resistive module 4 and charge and discharge capacitance module 5 are overregulated to control, with supply voltage
It is unrelated with temperature.
In the present embodiment, the charge and discharge resistive module 4 in two RC charge/discharge units 1 and charge and discharge electricity
The value of molar block 5 all correspond to it is identical, so two groups of charging networks 2 are full symmetric, so the duty ratio of generation time is 50%.
In another embodiment, the charge and discharge resistive module 4 and charge and discharge capacitance mould in two RC charge/discharge units 1
The value of block 5 is different, meet its resistance value it is identical with the product of capacitance when, the π of charging time t=2 of two charge and discharge electric networks 2
RC is identical, also can produce 50% clock duty cycle.
Further, the charge and discharge electric network 2 further includes test switch K2/K5 and test input current source Iin, described
Test input current source Iin, the test switch K2/K5 is sequentially connected in series with the charge/discharge unit 1.
After the completion of the clock generator production, the charge and discharge electric network 2 is trimmed according to following methods: being filled described in first adjusting
Discharge resistance module 4, then adjust the charge and discharge capacitance module 5.
When trimming the charge and discharge resistive module 4, the charge switch K1 is disconnected, be closed the test switch K2 and described
Discharge switch K3, the test input current source IinAdditional constant current tests the test input current source IinElectricity
Pressure, the value by configuring the register change the resistance value of the charge and discharge resistive module 4, make the test input current source
IinVoltage reach setting value, to determine the resistance value of charge and discharge resistive module 4, then according to the clock signal output terminal clk
Signal, configure the value of the register, trim the capacitance of the charge and discharge capacitance module 5, clock is made to be finally reached design
Value.Clock after trimming is unrelated with power supply and temperature, in subzero 40 degrees Celsius to 85 degree Celsius ranges, precision up to 0.5% very
To higher.
The above, only presently preferred embodiments of the present invention, the invention is not limited to above embodiment, as long as
It reaches technical effect of the invention with identical means, all should belong to protection scope of the present invention.
Claims (8)
1. a kind of high precision clock generator unrelated with power supply and temperature characterized by comprising charge and discharge electric network, setting
There are two, described two charge and discharge electric networks export respectively in turn in charging, discharge condition according to its charging and discharging state in turn
The charging time of energizing signal, described two charge and discharge electric networks is identical；The charge and discharge electric network includes completing within specified time
The RC charge/discharge unit of charging, the RC charge/discharge unit is by the opposite charge and discharge resistive module of temperature coefficient and charge and discharge capacitance
Module composition；The charge and discharge resistive module is composed in series by more than two resistance, and the resistance is negative temperature coefficient resister,
Each resistance is provided with resistance control switch connected in parallel；The charge and discharge capacitance module is by more than two capacitors
It composes in parallel, the capacitor is positive temperature coefficient capacitor, and each capacitor is provided with the capacitance controlled switches of series connection with it；
Each its resistance value of concatenated resistance is successively incremented by series in the charge and discharge resistive module, each in the charge and discharge capacitance module
Its capacitance of the capacitor of a parallel connection is successively incremented by series；
Digital trigger processing module is in charging according to the described two charge and discharge electric networks of energizing signal control in turn respectively, puts
Electricity condition exports clock signal according to the charging of described two charge and discharge electric networks, discharge condition.
2. a kind of high precision clock generator unrelated with power supply and temperature according to claim 1, it is characterised in that: institute
Charge and discharge electric network is stated to further include charge switch for controlling the charging of RC charge/discharge unit and put for controlling RC charge/discharge unit
The discharge switch of electricity, the RC charge/discharge unit further includes a charging voltage output end, and the charging voltage output end is placed
Among the charge and discharge resistive module and the charge and discharge capacitance module；
The charge and discharge electric network further includes comparator, and the comparator includes inputting for connecting the reference voltage of VA reference voltage
End and the comparison voltage input terminal for connecting RC charge/discharge unit charging voltage output end, the comparator are filled by comparing RC
Discharge cell charging voltage and VA reference voltage output energizing signal；
The input terminal of the digital trigger processing module is connected to the network with described two charge and discharge obtains its energizing signal respectively,
The digital trigger processing module further includes two switch control output ends, and two switch control output ends are handed over respectively
Fork controls the charge switch of one of charge and discharge electric network and the discharge switch of another charge and discharge electric network, the digital trigger
Processing module alternately switches the control signal of two switch control output ends according to energizing signal, makes two charge and discharge electric network alternatings
In charged state and discharge condition, according to charging and discharging state, the clock signal is from the digital trigger processing module
Clock signal output terminal output.
3. a kind of high precision clock generator unrelated with power supply and temperature according to claim 2, it is characterised in that: also
Including input supply voltage port and ground port, the input supply voltage port, charge switch, charge/discharge unit and ground port
It is sequentially connected in series, the discharge switch is arranged in parallel at the both ends of charge and discharge capacitance module, and the charging voltage output end is set
It is placed between charge and discharge resistive module and charge and discharge capacitance module.
4. a kind of high precision clock generator unrelated with power supply and temperature according to claim 3, it is characterised in that: also
Including VA generating circuit from reference voltage, the input supply voltage port, two divider resistances and ground port are sequentially connected in series, pressure stabilizing
The resistor coupled in parallel of capacitor and ground connection, the VA reference voltage input terminal are set between two divider resistances.
5. a kind of high precision clock generator unrelated with power supply and temperature according to claim 1, it is characterised in that: also
Including register, the charge and discharge resistive module, each resistance control switch of charge and discharge capacitance module and Capacity control are connected
Switch.
6. a kind of high precision clock generator unrelated with power supply and temperature according to claim 5, it is characterised in that: institute
Stating charge and discharge electric network further includes test switch and test input current source, and the test input current source, the test are opened
Pass is sequentially connected in series with the charge/discharge unit.
7. a kind of high precision clock generator unrelated with power supply and temperature according to claim 6, it is characterised in that: institute
After the completion of stating clock generator production, the charge and discharge electric network is trimmed according to following methods: first adjusting the charge and discharge resistive mode
Block, then adjust the charge and discharge capacitance module.
8. a kind of high precision clock generator unrelated with power supply and temperature according to claim 7, it is characterised in that: repair
When adjusting the charge and discharge resistive module, the charge switch is disconnected, is closed the test switch and the discharge switch, the survey
Input current source additional constant current is tried, the voltage of the test input current source is tested, by configuring the register
Value changes the resistance value of the charge and discharge resistive module, so that the voltage of the test input current source is reached setting value, with determination
The resistance value of charge and discharge resistive module configures the value of the register, trims then according to the signal of the clock signal output terminal
The capacitance of the charge and discharge capacitance module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510988849.9A CN105429611B (en) | 2015-12-24 | 2015-12-24 | A kind of high precision clock generator unrelated with power supply and temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510988849.9A CN105429611B (en) | 2015-12-24 | 2015-12-24 | A kind of high precision clock generator unrelated with power supply and temperature |
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| CN105429611A CN105429611A (en) | 2016-03-23 |
| CN105429611B true CN105429611B (en) | 2019-05-03 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112907B (en) * | 2019-05-22 | 2020-07-03 | 苏州浪潮智能科技有限公司 | Voltage compensation method and device of voltage reduction circuit |
| CN113346878A (en) * | 2021-06-17 | 2021-09-03 | 南京英锐创电子科技有限公司 | Clock circuit and electronic device |
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| CN102361439A (en) * | 2011-10-19 | 2012-02-22 | 中颖电子股份有限公司 | Chip built-in resistance-capacitance (RC) oscillator |
| CN102811054A (en) * | 2011-05-30 | 2012-12-05 | 贺林 | Relaxation oscillator with low power consumption |
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| CN205490456U (en) * | 2015-12-24 | 2016-08-17 | 深圳市汇春科技股份有限公司 | With power and irrelevant high precision clock generator of temperature |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7889018B2 (en) * | 2007-12-21 | 2011-02-15 | Sandisk Corporation | Low VT dependency RC oscillator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102811054A (en) * | 2011-05-30 | 2012-12-05 | 贺林 | Relaxation oscillator with low power consumption |
| CN102361439A (en) * | 2011-10-19 | 2012-02-22 | 中颖电子股份有限公司 | Chip built-in resistance-capacitance (RC) oscillator |
| CN103684256A (en) * | 2012-09-12 | 2014-03-26 | 无锡华润矽科微电子有限公司 | High-accuracy digital temperature-compensated crystal oscillator circuit structure with built-in crystal oscillator |
| CN205490456U (en) * | 2015-12-24 | 2016-08-17 | 深圳市汇春科技股份有限公司 | With power and irrelevant high precision clock generator of temperature |
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