CN105429611A - High-precision clock generator irrelevant to power and temperature - Google Patents
High-precision clock generator irrelevant to power and temperature Download PDFInfo
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- CN105429611A CN105429611A CN201510988849.9A CN201510988849A CN105429611A CN 105429611 A CN105429611 A CN 105429611A CN 201510988849 A CN201510988849 A CN 201510988849A CN 105429611 A CN105429611 A CN 105429611A
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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
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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
- H03K3/26—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 high-precision clock generator irrelevant to power and temperature. The high-precision clock generator is composed of two charge and discharge networks and a digital trigger processing module; the two charge and discharge networks alternate in charge and discharge states, and alternatively output turnover signals according to the charge and discharge states; the digital trigger processing module controls the two charge and discharge networks to alternate in the charge and discharge states according to the turnover signals, and outputs clock signals according to the charge and discharge states of the two charge and discharge networks. The clock generator is irrelevant to power and temperature through a charge and discharge unit composed of a charge and discharge resistance module and a charge and discharge capacitance module which are opposite to a temperature coefficient, so that the clock generator is unlikely influenced by the external environment; and each device can be integrated inside a chip, so that the matching property is good, and the purposes of the high-precision clock generator are fulfilled.
Description
Technical field
The present invention relates to a kind of clock generator, particularly a kind of high precision clock generator had nothing to do with power supply and temperature.
Background technology
Along with the development of semiconductor integrated circuit, various communication system develops rapidly, between system and system, the communication of internal system intermodule all needs clock, do not conflict to make communication system, country has put into effect the clock that various standard carrys out the various system of specification, simultaneously in order to make communication accurate, all require that system has high-precision clock.But the clock frequency that clock generator in general integrated circuit exports can change along with the change of power supply and temperature, and deviation ratio is comparatively large, precision is not high enough, and usual deviation is in (20%) left and right.Such precision can not meet the requirement of some systems to clock.In addition, because the deviation of integrated circuit technology is comparatively large, is all the additional High Precision Crystal Oscillator of chip exterior in most cases, thus makes system clock reach accurate.From the operation principle of crystal oscillator, the outer capacitance component of sheet can be introduced while additional crystal oscillator, also need chip internal modular circuit to match simultaneously, ability starting of oscillation; And the frequency of general crystal oscillator is lower, needs frequency multiplier circuit or PLL circuit just can obtain the clock frequency wanted.In addition, crystal oscillator and the outer electric capacity of sheet can increase system area, affect integrated level, and can increase cost; Inner frequency multiplier circuit or PLL circuit acquire a certain degree of difficulty, and matching outside sheet internal sheet is bad, if system layout is bad, is easily disturbed, affects the precision of clock.
Summary of the invention
For solving the problem, the object of the present invention is to provide a kind of high precision clock generator had nothing to do with power supply and temperature.The present invention solves the technical scheme that its problem adopts:
The high precision clock generator had nothing to do with power supply and temperature, comprising:
Discharge and recharge network, is provided with two, and described two discharge and recharge networks are in charging, discharge condition respectively in turn, and according to its charging and discharging state output switching activity signal in turn, the charging interval of described two discharge and recharge networks is identical; Described discharge and recharge network comprises at the appointed time the RC charge/discharge unit completing charging, and described RC charge/discharge unit is made up of the contrary discharge and recharge resistive module of temperature coefficient and charge and discharge capacitance module; Digital trigger processing module, controls described two discharge and recharge networks according to energizing signal and is in charging, discharge condition in turn respectively, according to charging, the discharge condition clock signal of described two discharge and recharge networks.The digital control logic of described digital trigger processing module required for accurate 50% duty cycle clock signal of described clock generator generation.
Further, described discharge and recharge network also comprises for the charge switch of control RC charge/discharge unit charging and the discharge switch for the electric discharge of control RC charge/discharge unit, described RC charge/discharge unit also comprises a charging voltage output, and described charging voltage output is positioned in the middle of described discharge and recharge resistive module and described charge and discharge capacitance module.
Further, described discharge and recharge network also comprises comparator, and described comparator comprises reference voltage input terminal for connecting VA reference voltage and the comparative voltage input for being connected RC charge/discharge unit charging voltage output, described comparator by comparing RC charge/discharge unit charging voltage and VA reference voltage output switching activity signal, when described RC charge/discharge unit charging voltage is equal with VA reference voltage, described comparator output switching activity signal, the input of described digital trigger processing module is connected with described two discharge and recharge networks respectively and obtains its energizing signal, described digital trigger processing module also comprises two switch control rule outputs, two described switch control rule outputs are the charge switch of one of them discharge and recharge network of cross-over control and the discharge switch of another discharge and recharge network respectively, described digital trigger processing module replaces the control signal of switching two switch control rule outputs according to energizing signal, two discharge and recharge networks are made alternately to be in charged state and discharge condition, according to charging and discharging state, described clock signal exports from the clock signal output terminal of described digital trigger processing module.
Further, described discharge and recharge network also comprises input supply voltage port and ground port, described input supply voltage port, charge switch, charge/discharge unit and ground port are sequentially connected in series, described discharge switch is arranged in parallel the two ends in charge and discharge capacitance module, and described charging voltage output is arranged between discharge and recharge resistive module and charge and discharge capacitance module.
Further, also comprise VA generating circuit from reference voltage, described input supply voltage port, two divider resistances and ground port are connected successively, the resistor coupled in parallel of electric capacity of voltage regulation and ground connection, described VA reference voltage input terminal is arranged between two divider resistances, and described VA reference voltage produces 1/2Vdd input supply voltage.
Further, described discharge and recharge resistive module is made up of plural resistant series, and described resistance is negative temperature coefficient resister, and described each resistance is provided with the resistance control switch in parallel with it; Described charge and discharge capacitance module is made up of plural Capacitance parallel connection, and described electric capacity is positive temperature coefficient electric capacity, and described each electric capacity is provided with the capacitance controlled switches of series connection with it.In described discharge and recharge resistive module, its resistance of resistance of each series connection increases progressively in progression successively, and its capacitance of electric capacity of each parallel connection in described charge and discharge capacitance module increases progressively in progression successively.Also comprise register, connect described discharge and recharge resistive module, each resistance control switch of charge and discharge capacitance module and capacitance controlled switches.The resistance value of described discharge and recharge resistive module and the capacitance of charge and discharge capacitance module come adjusting size and precision thereof by configuration register.
Because the charging interval t=2 π RC of described discharge and recharge network, the charging interval of described discharge and recharge network can be determined by the capacitance of the resistance value and charge and discharge capacitance module that adjust described discharge and recharge resistive module and not be subject to power supply voltage influence; In addition, design the resistance of described discharge and recharge resistive module and the capacitance of charge and discharge capacitance module, make their product certain, temperature coefficient is cancelled out each other, and the clock size that clock generator is produced is temperature independent.
Further, described discharge and recharge network also comprises Test Switchboard and test input electric current source, and described test input electric current source, described Test Switchboard are connected successively with described charge/discharge unit.After described clock generator has been produced, trim described discharge and recharge network according to following methods: first regulate described discharge and recharge resistive module, then regulate described charge and discharge capacitance module.When trimming described discharge and recharge resistive module, disconnect described charge switch, closed described Test Switchboard and described discharge switch, described test input electric current source additional constant current, test the voltage of described electric current source, the resistance of described discharge and recharge resistive module is changed by the value configuring described register, the voltage of described measuring current source is made to reach set point, to determine the resistance of discharge and recharge resistive module, then according to the signal of described clock signal output terminal, configure the value of described register, trim the capacitance of described charge and discharge capacitance module.Had nothing to do by the clock signal that trimmed and power supply and temperature, subzero 40 degrees Celsius in 85 degree Celsius range, precision can reach 0.5% even higher.
Compared with prior art, the present invention has the following advantages: the zero-temperature coefficient RC charging clock structure of the electric capacity composition of a kind of negative temperature coefficient resister that the present invention adopts and positive temperature coefficient, each device can be integrated in chip internal, matching is good, is not subject to outer signals interference, after trimming calibration, clock size has nothing to do with power supply and variations in temperature, not easily be affected by the external environment, accomplished real high accuracy, there is the unrivaled technical advantage of other clock generator existing.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and example, the invention will be further described.
Fig. 1 is the circuit structure diagram of a kind of high precision clock generator had nothing to do with power supply and temperature of the present invention;
Fig. 2 is the structural representation of the discharge and recharge resistive module of the configurable size of a kind of high precision clock generator had nothing to do with power supply and temperature of the present invention;
Fig. 3 is the structural representation of the charge and discharge capacitance module capacitance of the configurable size of a kind of high precision clock generator had nothing to do with power supply and temperature of the present invention;
Fig. 4 is the structural representation of the VA generating circuit from reference voltage of a kind of high precision clock generator had nothing to do with power supply and temperature of the present invention.
Embodiment
With reference to Fig. 1-Fig. 4, a kind of high precision clock generator had nothing to do with power supply and temperature of the present invention, is characterized in that, comprising:
Discharge and recharge network 2, is provided with two, and described two discharge and recharge networks 2 are in charging, discharge condition respectively in turn, and according to its charging and discharging state output switching activity signal in turn, the charging interval of described two discharge and recharge networks 2 is identical; Described discharge and recharge network 2 is included in the fixed time RC charge/discharge unit 1 completing charging, and described RC charge/discharge unit 1 is made up of the contrary discharge and recharge resistive module 4 of temperature coefficient and charge and discharge capacitance module 5;
Digital trigger processing module 3, controls described two discharge and recharge networks 2 according to energizing signal and is in charging, discharge condition in turn respectively, according to charging, the discharge condition clock signal of described two discharge and recharge networks 2.
Further, described discharge and recharge network 2 also comprises for the charge switch K1/K4 of control RC charge/discharge unit 1 charging and the discharge switch K3/K6 for the electric discharge of control RC charge/discharge unit 1, described RC charge/discharge unit 1 also comprises a charging voltage output VB/VC, and described charging voltage output VB/VC is positioned in the middle of described discharge and recharge resistive module 4 and described charge and discharge capacitance module 5.
Further, described discharge and recharge network 2 also comprises comparator, described comparator comprises reference voltage input terminal for connecting VA reference voltage and the comparative voltage input for being connected RC charge/discharge unit 1 charging voltage output VB/VC, and described comparator is by comparing RC charge/discharge unit 1 charging voltage VB/VC and VA reference voltage output switching activity signal.
Further, the input of described digital trigger processing module 3 is connected with described two discharge and recharge networks 2 respectively and obtains its energizing signal, described digital trigger processing module 3 also comprises two switch control rule outputs ctrl1, ctrl2, described switch control rule output ctrl1 controls described charge switch K1 and discharge switch K6, and described switch control rule output ctrl2 controls described charge switch K4 and discharge switch K3, when charge switch K1 and discharge switch K6 closes, and during discharge switch K3 and charge switch K4 disconnection, the RC charging network 2 of side charges, when charging voltage output VB voltage reaches VA reference voltage level, this side comparator output switching activity, and then described digital trigger processing module 3 replaces switching two switch control rule output ctrl1 according to energizing signal, the control signal of ctrl2, discharge switch K3 and charge switch K4 is closed, charge switch K1 and discharge switch K6 disconnects, opposite side RC charging network 2 charges, when the voltage of charging voltage output VC reaches VA reference voltage level, opposite side comparator output switching activity, and then charge switch K1 and discharge switch K6 is closed, discharge switch K3 and charge switch K4 disconnects, two discharge and recharge networks 2 are made alternately to be in charged state and discharge condition thus, according to charging and discharging state, described clock signal exports from the clock signal output terminal clk of described digital trigger processing module 3, produce clock thus.
Further, also comprise input supply voltage port Vdd and ground port, described input supply voltage port Vdd, charge switch K1/K4, charge/discharge unit 1 and ground port are sequentially connected in series, described discharge switch K3/K6 is arranged in parallel at the two ends of charge and discharge capacitance module 5, and described charging voltage output is arranged between discharge and recharge resistive module 4 and charge and discharge capacitance module 5.
Further, also comprise VA generating circuit from reference voltage 6, described input supply voltage port Vdd, two divider resistances R1, R2 and ground port are connected successively, electric capacity of voltage regulation C1 is in parallel with the divider resistance R2 of ground connection, described VA reference voltage input terminal is arranged between two divider resistances R1, R2, and described VA generating circuit from reference voltage 6 produces 1/2 input supply voltage Vdd.
Further, described discharge and recharge resistive module 4 is composed in series by plural resistance R, and described resistance R is negative temperature coefficient resister, and described each resistance R is provided with the resistance control switch K in parallel with it; Described charge and discharge capacitance module 5 is composed in parallel by plural electric capacity C, and described electric capacity C is positive temperature coefficient electric capacity, and described each electric capacity C is provided with the capacitance controlled switches K ＇ of series connection with it.In another embodiment, described resistance is positive temperature coefficient resistor, and described electric capacity is negative temperature coefficient electric capacity.
Further, in described discharge and recharge resistive module 4, its resistance of resistance R of each series connection increases progressively in progression successively, its capacitance of electric capacity C of each parallel connection in described charge and discharge capacitance module 5 increases progressively in progression successively, and progression increases progressively to arrange to be convenient to improve the accuracy regulating described discharge and recharge resistive module resistance and charge and discharge capacitance module capacitance value.Also comprise register in addition, connect described discharge and recharge resistive module 4, each resistance control switch K of charge and discharge capacitance module 5 and capacitance controlled switches K ＇.By the value of configuration register, regulate the size of the capacitance of the resistance of described discharge and recharge resistive module 4 and described charge and discharge capacitance module 5, the precision of adjustment is determined by the figure place of register.
According to the charging interval t=2 π RC of RC discharge and recharge network 2, the clock speed that described clock generator produces can be controlled by the value of the resistance R and electric capacity C that regulate described discharge and recharge resistive module 4 and charge and discharge capacitance module 5, has nothing to do with supply voltage and temperature.
In the present embodiment, the described discharge and recharge resistive module 4 in two described RC charge/discharge units 1 is all corresponding identical with the value of charge and discharge capacitance module 5, so two groups of charging network 2 full symmetrics, so the duty ratio of generation time is 50%.
In another embodiment, described discharge and recharge resistive module 4 in two RC charge/discharge units 1 is different with the value of charge and discharge capacitance module 5, when meeting its resistance value and being identical with the product of capacitance, the charging interval t=2 π RC of two discharge and recharge networks 2 is identical, also can produce the clock duty cycle of 50%.
Further, described discharge and recharge network 2 also comprises Test Switchboard K2/K5 and test input electric current source I
in, described test input electric current source I
in, described Test Switchboard K2/K5 connects successively with described charge/discharge unit 1.
After described clock generator has been produced, trim described discharge and recharge network 2 according to following methods: first regulate described discharge and recharge resistive module 4, then regulate described charge and discharge capacitance module 5.
When trimming described discharge and recharge resistive module 4, disconnect described charge switch K1, closed described Test Switchboard K2 and described discharge switch K3, described test input electric current source I
inadditional constant current, tests described test input electric current source I
involtage, changed the resistance of described discharge and recharge resistive module 4 by the value configuring described register, make described test input electric current source I
involtage reach set point, to determine the resistance of discharge and recharge resistive module 4, then according to the signal of described clock signal output terminal clk, configure the value of described register, trim the capacitance of described charge and discharge capacitance module 5, make clock finally reach design load.Clock after trimming and power supply and temperature have nothing to do, subzero 40 degrees Celsius in 85 degree Celsius range, precision can reach 0.5% even higher.
The above, just preferred embodiment of the present invention, the present invention is not limited to above-mentioned execution mode, as long as it reaches technique effect of the present invention with identical means, all should belong to protection scope of the present invention.
Claims (10)
1. the high precision clock generator had nothing to do with power supply and temperature, is characterized in that, comprising:
Discharge and recharge network, is provided with two, and described two discharge and recharge networks are in charging, discharge condition respectively in turn, and according to its charging and discharging state output switching activity signal in turn, the charging interval of described two discharge and recharge networks is identical; Described discharge and recharge network comprises at the appointed time the RC charge/discharge unit completing charging, and described RC charge/discharge unit is made up of the contrary discharge and recharge resistive module of temperature coefficient and charge and discharge capacitance module;
Digital trigger processing module, controls described two discharge and recharge networks according to energizing signal and is in charging, discharge condition in turn respectively, according to charging, the discharge condition clock signal of described two discharge and recharge networks.
2. a kind of high precision clock generator had nothing to do with power supply and temperature according to claim 1, it is characterized in that: described discharge and recharge network also comprises for the charge switch of control RC charge/discharge unit charging and the discharge switch for the electric discharge of control RC charge/discharge unit, described RC charge/discharge unit also comprises a charging voltage output, and described charging voltage output is positioned in the middle of described discharge and recharge resistive module and described charge and discharge capacitance module;
Described discharge and recharge network also comprises comparator, described comparator comprises reference voltage input terminal for connecting VA reference voltage and the comparative voltage input for being connected RC charge/discharge unit charging voltage output, and described comparator is by comparing RC charge/discharge unit charging voltage and VA reference voltage output switching activity signal;
The input of described digital trigger processing module is connected with described two discharge and recharge networks respectively and obtains its energizing signal, described digital trigger processing module also comprises two switch control rule outputs, two described switch control rule outputs are the charge switch of one of them discharge and recharge network of cross-over control and the discharge switch of another discharge and recharge network respectively, described digital trigger processing module replaces the control signal of switching two switch control rule outputs according to energizing signal, two discharge and recharge networks are made alternately to be in charged state and discharge condition, according to charging and discharging state, described clock signal exports from the clock signal output terminal of described digital trigger processing module.
3. a kind of high precision clock generator had nothing to do with power supply and temperature according to claim 2, it is characterized in that: also comprise input supply voltage port and ground port, described input supply voltage port, charge switch, charge/discharge unit and ground port are sequentially connected in series, described discharge switch is arranged in parallel the two ends in charge and discharge capacitance module, and described charging voltage output is arranged between discharge and recharge resistive module and charge and discharge capacitance module.
4. a kind of high precision clock generator had nothing to do with power supply and temperature according to claim 3, it is characterized in that: also comprise VA generating circuit from reference voltage, described input supply voltage port, two divider resistances and ground port are connected successively, the resistor coupled in parallel of electric capacity of voltage regulation and ground connection, described VA reference voltage input terminal is arranged between two divider resistances.
5. a kind of high precision clock generator had nothing to do with power supply and temperature according to claim 1, it is characterized in that: described discharge and recharge resistive module is made up of plural resistant series, described resistance is negative temperature coefficient resister, and described each resistance is provided with the resistance control switch in parallel with it; Described charge and discharge capacitance module is made up of plural Capacitance parallel connection, and described electric capacity is positive temperature coefficient electric capacity, and described each electric capacity is provided with the capacitance controlled switches of series connection with it.
6. a kind of high precision clock generator had nothing to do with power supply and temperature according to claim 5, it is characterized in that: in described discharge and recharge resistive module, its resistance of resistance of each series connection increases progressively in progression successively, its capacitance of electric capacity of each parallel connection in described charge and discharge capacitance module increases progressively in progression successively.
7. the high precision clock generator that a kind of and power supply according to claim 5 or 6 and temperature have nothing to do, it is characterized in that: also comprise register, connect described discharge and recharge resistive module, each resistance control switch of charge and discharge capacitance module and capacitance controlled switches.
8. a kind of high precision clock generator had nothing to do with power supply and temperature according to claim 3, it is characterized in that: described discharge and recharge network also comprises Test Switchboard and test input electric current source, described test input electric current source, described Test Switchboard are connected successively with described charge/discharge unit.
9. a kind of high precision clock generator had nothing to do with power supply and temperature according to claim 8, it is characterized in that: after described clock generator has been produced, trim described discharge and recharge network according to following methods: first regulate described discharge and recharge resistive module, then regulate described charge and discharge capacitance module.
10. a kind of high precision clock generator had nothing to do with power supply and temperature according to claim 9, it is characterized in that: when trimming described discharge and recharge resistive module, disconnect described charge switch, closed described Test Switchboard and described discharge switch, described test input electric current source additional constant current, test the voltage of described test input electric current source, the resistance of described discharge and recharge resistive module is changed by the value configuring described register, the voltage of described test input electric current source is made to reach set point, to determine the resistance of discharge and recharge resistive module, then according to the signal of described clock signal output terminal, configure the value of described register, trim the capacitance of described 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 |
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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 |
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| CN105429611A true CN105429611A (en) | 2016-03-23 |
| CN105429611B CN105429611B (en) | 2019-05-03 |
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Cited By (2)
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| WO2020232831A1 (en) * | 2019-05-22 | 2020-11-26 | 苏州浪潮智能科技有限公司 | Voltage compensation method and apparatus for step-down 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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| CN105429611B (en) | 2019-05-03 |
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