CN101686036A - Apparatus for improving accuracy of RC oscillator in chip and use method thereof - Google Patents
Apparatus for improving accuracy of RC oscillator in chip and use method thereof Download PDFInfo
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- CN101686036A CN101686036A CN200810043802A CN200810043802A CN101686036A CN 101686036 A CN101686036 A CN 101686036A CN 200810043802 A CN200810043802 A CN 200810043802A CN 200810043802 A CN200810043802 A CN 200810043802A CN 101686036 A CN101686036 A CN 101686036A
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Abstract
The present invention discloses an apparatus for improving the accuracy of RC oscillator in chip, comprising an RC oscillator; a nonvolatile memory for storing the correction data of target frequency;and a controller connected with the nonvolatile memory and the RC oscillator, for reading and writing the correction data in the nonvolatile memory. The resistor in the RC oscillator is a programmable resistor, the resistance of the programmable resistor is controlled by the controller, and the output frequency accuracy of the RC oscillator is changed by changing the resistance of the programmable resistor. By reading the correction data in the nonvolatile memory, the resistance of the programmable resistor is controlled. The invention can effectively ensure the RC oscillator output a stablefrequency, so that the output frequency offset of the RC oscillator caused by various factors is reduced, thus improving the output accuracy of the RC oscillator.
Description
Technical field
The present invention relates to a kind of device and using method thereof that is used for oscillator, be specifically related to a kind of device and using method thereof that is used to improve oscillator precision.
Background technology
The IC RC oscillator in chip, owing to be subjected to the influence of factors such as production technology, working temperature, operating voltage, tend to cause identical circuit design, the chip of same batch or different batches, the output frequency consistency of RC oscillator is bad, in a very big frequency output area, will cause the operating frequency instability of chip like this.In order to solve the problem of frequency shift (FS), and under the condition that can not change production technology or other factors, adopt the present invention can effectively improve the offset problem on a large scale of RC oscillator output frequency when operate as normal.
Summary of the invention
Technical problem to be solved by this invention provides a kind of device and using method thereof that improves the output accuracy of RC oscillator in chip.
In order to solve above technical problem, the invention provides a kind of device that improves accuracy of RC oscillator in chip, comprise the RC oscillator; Non-volatility memorizer, the correction data that are used to store target frequency; With non-volatility memorizer and the controller that the RC oscillator is connected, be used to read and write the correction data in the non-volatility memorizer; Resistance in the RC oscillator is programmable resistance, by the resistance of controller control programmable resistance, changes the output frequency precision of RC oscillator by the resistance that changes programmable resistance.
By reading the correction data in the non-volatility memorizer, the resistance of control programmable resistance, the present invention can effectively guarantee more stable frequency of RC oscillator output, thereby reduced the RC oscillator output frequency deviation that causes because of various factors, thereby reached the purpose that improves the RC output accuracy.
Improve the using method of the device of accuracy of RC oscillator in chip, may further comprise the steps:
Only just can carry out rewriting operation to non-volatility memorizer correction district under test pattern, normal mode can not be done any operation to it down;
Under test pattern, determine the original frequency of RC oscillator, calculate the correction data that reach target frequency, write these data to the non-volatility memorizer district;
Read to revise data under system's normal mode of operation, give these data to give the RC oscillator, the RC oscillator utilizes this to revise the resistance that data are adjusted the programmable resistance of RC oscillator, thereby adjusts RC oscillator output frequency, improves the precision of output frequency.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is a schematic representation of apparatus in the embodiment of the invention;
Fig. 2 is the logical flow chart of the described method of the embodiment of the invention.
Embodiment
As shown in Figure 1, for convenience of description, present embodiment is by the narration that should be used for of certain chip system, and system configuration such as Fig. 1 comprise the RC oscillator; Non-volatility memorizer, the correction data that are used to store target frequency; With non-volatility memorizer and the controller that the RC oscillator is connected, be used to read and write the correction data in the non-volatility memorizer; Resistance in the RC oscillator is programmable resistance, by the resistance of controller control programmable resistance, changes the output frequency precision of RC oscillator by the resistance that changes programmable resistance.Described programmable resistance is made of two-stage resistance unit at least, be connected in series between the described resistance unit of two-stage at least, each resistance unit all has a switch to be connected in parallel with it, by controlling opening or closing of these switches, thereby controls the size of whole programmable resistance resistance.
To nonvolatile memory, present embodiment adopts EEPROM as memory, during write data in the EEPROM, the RC oscillator enables to open, RC oscillator concussion output, EEPROM utilizes the time of this RC oscillator record write operation, if the output of RC oscillator is unstable, in a very big frequency range, so when writing down identical frequency number, the erasable time of cost is just inconsistent, in other words will be in a very big time range.According to present embodiment, the method that just can utilize this correction is controlled at the output of RC oscillator in the desirable frequency range, thereby guarantees that the erasable time big skew can not take place.
The present embodiment using method is as follows:
1, in the silicon chip level, utilize the test pin, chip is set enters test pattern.
2, send erasable order to give chip, the erasable time of the EEPROM of test chip, determine that the output frequency of RC oscillator and desirable output frequency compare, determine the data of correction, these data of 4 are write programmable storage (OTP) district.
3, chip is set in normal mode of operation, after chip power resets, under normal mode of operation, when for the first time IC being done read or write, must guarantee before " stopping " signal, utilize clock signal 4 the data in OTP district to be read (actual only need 4 clock signals just can) and send RC oscillator, thereby the output frequency of modified R C oscillator guarantees that the erasable time is in a smaller deviation range in desirable scope.
4, need only not power down of system, chip just can not go to read 4 bit data in OTP district again, preserves the correction value of front, up to the chip power down always.
5, re-power when the chip power down, do the same action of step 3, can read the data in OTP district so again, the RC oscillator is done corrective action.
The present invention is not limited to execution mode discussed above.More than the description of embodiment is intended in order to describe and illustrate the technical scheme that the present invention relates to.This is not described should or limit protection scope of the present invention as limit.Based on the conspicuous conversion of the present invention enlightenment or substitute and also should be considered to fall into protection scope of the present invention.Above embodiment is used for disclosing best implementation method of the present invention, so that those of ordinary skill in the art can use numerous embodiments of the present invention and multiple alternative reaches purpose of the present invention.
Claims (5)
1, a kind of device that improves accuracy of RC oscillator in chip comprises the RC oscillator; It is characterized in that,
Also comprise non-volatility memorizer, be used to store the correction data of target frequency;
With non-volatility memorizer and the controller that the RC oscillator is connected, be used to read and write the correction data in the non-volatility memorizer;
Resistance in the RC oscillator is programmable resistance, by the resistance of controller control programmable resistance, changes the output frequency precision of RC oscillator by the resistance that changes programmable resistance.
2, the device of raising accuracy of RC oscillator in chip as claimed in claim 1 is characterized in that, an above bit of described non-volatility memorizer is used to store the adjustment data that improve RC oscillator precision.
3, the device of raising accuracy of RC oscillator in chip as claimed in claim 1, it is characterized in that, described programmable resistance is made of two-stage resistance unit at least, be connected in series between the described resistance unit of two-stage at least, each resistance unit all has a switch to be connected in parallel with it, by controlling opening or closing of these switches, thereby control the size of whole programmable resistance resistance.
4, the using method of the device of raising accuracy of RC oscillator in chip as claimed in claim 1 is characterized in that, may further comprise the steps:
Only just can carry out rewriting operation to non-volatility memorizer correction district under test pattern, normal mode can not be done any operation to it down;
Under test pattern, determine the original frequency of RC oscillator, calculate the correction data that reach target frequency, write these data to the non-volatility memorizer district;
Read to revise data under system's normal mode of operation, give these data to give the RC oscillator, the RC oscillator utilizes this to revise the resistance that data are adjusted the programmable resistance of RC oscillator, thereby adjusts RC oscillator output frequency, improves the precision of output frequency.
5, the using method of the device of raising accuracy of RC oscillator in chip as claimed in claim 4, it is characterized in that, system powers on, under normal mode of operation, read once to revise data, as long as not power down of system just can not go to read these data again, power on after system's power down again, need again to read this data again, the clock of reading these data is the clock that utilizes the serial communication that chip is read and write.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810043802A CN101686036A (en) | 2008-09-25 | 2008-09-25 | Apparatus for improving accuracy of RC oscillator in chip and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810043802A CN101686036A (en) | 2008-09-25 | 2008-09-25 | Apparatus for improving accuracy of RC oscillator in chip and use method thereof |
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| CN101686036A true CN101686036A (en) | 2010-03-31 |
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| CN200810043802A Pending CN101686036A (en) | 2008-09-25 | 2008-09-25 | Apparatus for improving accuracy of RC oscillator in chip and use method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106251902A (en) * | 2016-07-27 | 2016-12-21 | 深圳市航顺芯片技术研发有限公司 | A kind of pierce circuit promoting EEPROM programming precision and method thereof |
| CN111404686A (en) * | 2020-04-21 | 2020-07-10 | 珠海创飞芯科技有限公司 | PUF (physical unclonable function) key generation system and method based on OTP (one time programmable) storage array |
| WO2022083638A1 (en) * | 2020-10-23 | 2022-04-28 | 维沃移动通信有限公司 | Chip clock frequency adjustment method and apparatus, chip, and electronic device |
-
2008
- 2008-09-25 CN CN200810043802A patent/CN101686036A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106251902A (en) * | 2016-07-27 | 2016-12-21 | 深圳市航顺芯片技术研发有限公司 | A kind of pierce circuit promoting EEPROM programming precision and method thereof |
| CN106251902B (en) * | 2016-07-27 | 2020-05-19 | 深圳市航顺芯片技术研发有限公司 | Oscillator circuit for improving EEPROM programming precision |
| CN111404686A (en) * | 2020-04-21 | 2020-07-10 | 珠海创飞芯科技有限公司 | PUF (physical unclonable function) key generation system and method based on OTP (one time programmable) storage array |
| CN111404686B (en) * | 2020-04-21 | 2023-10-10 | 珠海创飞芯科技有限公司 | PUF key generation system and method based on OTP memory array |
| WO2022083638A1 (en) * | 2020-10-23 | 2022-04-28 | 维沃移动通信有限公司 | Chip clock frequency adjustment method and apparatus, chip, and electronic device |
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Open date: 20100331 |