CN101989967B - Direct current bias compensation method of analog-to-digital conversion chip - Google Patents
Direct current bias compensation method of analog-to-digital conversion chip Download PDFInfo
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Abstract
The invention provides a direct current bias compensation method of an analog-to-digital conversion chip, which is used for solving the direct current bias problem of the analog-to-digital conversion chip. The direct current bias compensation method comprises the following steps of: cutting off signals of a receiving passage of the analog-to-digital conversion chip; sampling background noise output by the analog-to-digital conversion chip; carrying out power statistics with the fixed duration on the obtained sampling data; calculating the absolute value of the direct current bias compensationvalue according to the power statistics value; sampling the background noise output by the analog-to-digital conversion chip for a second time; carrying out direct current bias compensation on the obtained sampling data according to the absolute value of the direct current bias compensation value; obtaining the direct current bias compensation value according to the direct current bias compensation results; conducting the signals of the receiving passage of the analog-to-digital conversion chip; and carrying out direct current bias compensation on the signals received by the analog-to-digitalconversion chip according to the direct current bias compensation value. The method eliminates the direct current bias of the analog-to-digital conversion chip, and improves the dynamic range of the signal identification of the receiving passage of the analog-to-digital conversion chip.
Description
Technical field
The present invention relates to ADC(Analog-to-Digital Converter, analog-to-digital conversion) the integrated application of chip, the particularly direct-current offset compensation method of modulus conversion chip.
Background technology
In the receive path design of communication system, the application of ADC chip is essential, and often to carry out power statistic to the signal that the ADC chip receives, and the ADC chip is because the reasons such as craft precision error in the manufacturing process, all there is DC offset problem, and the direct current biasing of every kind of chip has nothing in common with each other, even with also there being difference between the individuality of a chip.Therefore when the signal that receives is carried out power statistic, the direct current biasing of ADC chip will be superimposed upon on the signal of reception, cause the power statistic distortion as a result of described signal, thereby reduced the dynamic range of ADC chip receive path signal identification, influenced communication system functionality.
Existing method for eliminating dc bias, the direct current biasing that produces when at receiving equipment input signal being carried out frequency conversion proposes.When receiving equipment carries out frequency conversion to input signal, introduced other signals inevitably, and the level of the signal of introducing and the level of input signal there are bigger difference, thereby in the frequency process of conversion reception signal, have produced direct current biasing.The origin cause of formation of this direct current biasing and the direct current biasing origin cause of formation of ADC chip have basic different.
Summary of the invention
The present invention proposes a kind of direct-current offset compensation method of modulus conversion chip, in order to solve the DC offset problem that the ADC chip exists, improves the dynamic range of ADC chip receive path signal identification.
The present invention is a kind of direct-current offset compensation method of modulus conversion chip, and the technical scheme of employing comprises that step is as follows: cut off the signal of modulus conversion chip receive path, the background noise of described modulus conversion chip output is sampled; To the fixing power statistic of duration of the sampled data that obtains, calculate the absolute value of direct current biasing offset according to this power statistic value; Again the described background noise of described modulus conversion chip output is sampled, according to the absolute value of described direct current biasing offset the sampled data that obtains is carried out the direct current biasing compensation; According to the direct current biasing compensation result, draw the direct current biasing offset; Connect the signal of described modulus conversion chip receive path, the signal that described modulus conversion chip is received according to described direct current biasing offset carries out the direct current biasing compensation.
A kind of direct-current offset compensation method of modulus conversion chip comprises that step is as follows:
The signal of step 1, cut-out modulus conversion chip receive path is sampled to the background noise of described modulus conversion chip output;
Step 2, to the fixing power statistic of duration of first sampled data that obtains, the power statistic value P first time that obtains, and calculate the absolute value of direct current biasing offset according to following algorithm:
Or
K is the absolute value of direct current biasing offset, and N is the sample number of sampling, and P is the power statistic value first time;
Step 3, again the described background noise of described modulus conversion chip output is sampled, second sampled data that obtains is added the absolute value of the above direct current biasing offset, obtain the sampled data after the direct current biasing compensation;
Step 4, to the fixing power statistic of duration of the sampled data after the direct current biasing compensation, obtain power statistic value P1 for the second time, relatively for the first time power statistic value P with the second time power statistic value P1 obtain the symbol of direct current biasing offset:
If P〉P1, then the symbol of direct current biasing offset is for negative;
If P＜=P1, then the symbol of direct current biasing offset is for just;
The signal of step 5, the described modulus conversion chip receive path of connection, the signal that described modulus conversion chip is received according to described direct current biasing offset carries out the direct current biasing compensation.
A kind of direct-current offset compensation method of modulus conversion chip comprises that step is as follows:
The signal of step 1, cut-out modulus conversion chip receive path is sampled to the background noise of described modulus conversion chip output;
Step 2, to the fixing power statistic of duration of first sampled data that obtains, the power statistic value P first time that obtains, and calculate the absolute value of direct current biasing offset according to following algorithm:
Or
K is the absolute value of direct current biasing offset, and N is the sample number of sampling, and P is the power statistic value first time;
Step 3, again the described background noise of described modulus conversion chip output is sampled, second sampled data that obtains is deducted the absolute value of described direct current biasing offset, obtain the sampled data after the direct current biasing compensation;
Step 4, to the fixing power statistic of duration of the sampled data after the compensation of this direct current biasing, obtain power statistic value P1 for the second time, relatively for the first time power statistic value P with the second time power statistic value P1 obtain the symbol of direct current biasing offset:
If P〉P1, then the symbol of direct current biasing offset is for just;
If P＜=P1, then the symbol of direct current biasing offset is for negative;
The signal of step 5, the described modulus conversion chip receive path of connection, the signal that described modulus conversion chip is received according to described direct current biasing offset carries out the direct current biasing compensation.
The present invention proposes a kind of direct-current offset compensation method of modulus conversion chip, comprising: cut off the signal of modulus conversion chip receive path, the background noise of described modulus conversion chip output is sampled; To the fixing power statistic of duration of the sampled data that obtains, calculate the absolute value of direct current biasing offset according to this power statistic value; Again the described background noise of described modulus conversion chip output is sampled, according to the absolute value of described direct current biasing offset the sampled data that obtains is carried out the direct current biasing compensation; According to the direct current biasing compensation result, draw the direct current biasing offset; Connect the signal of described modulus conversion chip receive path, the signal that described modulus conversion chip is received according to described direct current biasing offset carries out the direct current biasing compensation; Realized the direct current biasing compensation of modulus conversion chip, and this method structure is simple, need just can not realize that the direct current biasing of modulus conversion chip is calibrated voluntarily by any supplementary instrument, has improved the dynamic range of ADC chip receive path signal identification.
Description of drawings
Fig. 1 is the schematic flow sheet of the direct-current offset compensation method of a kind of modulus conversion chip of the present invention;
Fig. 2 is the schematic flow sheet of the direct-current offset compensation method of the another kind of modulus conversion chip of the present invention.
Embodiment
A kind of direct-current offset compensation method of modulus conversion chip as Fig. 1, comprises that step is as follows:
The signal of step 1, cut-out modulus conversion chip receive path is sampled to the background noise of described modulus conversion chip output.
Step 2, to the fixing power statistic of duration of first sampled data that obtains, the power statistic value P first time that obtains, and according to following algorithm:
(K is the absolute value of direct current biasing offset, and N is the sample number of sampling, and P is the power statistic value first time) calculates the absolute value of direct current biasing offset;
Described fixedly duration, determine according to the accuracy requirement of calculating, duration is more long, precision is more high, and on the contrary, then precision is more low, fixedly duration can be set to different values according to user's request, in the present embodiment, that described fixedly duration adopts is 5ms, namely the sampled data that obtains is continued the power statistic of 5ms;
A kind of concrete execution mode behind the absolute value of calculating direct current biasing offset, also comprises: to the step that the absolute value of described direct current biasing offset is verified, specific as follows:
Absolute value and the thresholding of described direct current biasing offset are compared:
If the absolute value of described direct current biasing offset is not less than described thresholding, the absolute value of then judging described direct current biasing offset is wrong, returning step 1 samples to the described background noise of described modulus conversion chip output again, and recomputate the absolute value of direct current biasing offset according to this sampled data and described algorithm, and if add up to judge that the absolute value of described direct current biasing offset is that wrong number of times surpasses preset threshold value, then stop the direct current biasing compensation, and provide the compensation failure information; Described preset threshold value determines that according to the debugging situation of modulus conversion chip in the present embodiment, described preset threshold value is 3;
If the absolute value of described direct current biasing offset is less than described thresholding, the absolute value of then judging described direct current biasing offset is correct, execution in step 3; Described thresholding is the given value that the technical manual of modulus conversion chip provides;
In addition, as another kind of embodiment, also can adopt another kind of algorithm to calculate the absolute value of described direct current biasing offset, specific algorithm is:
(K is the absolute value of direct current biasing offset, and N is the sample number of sampling, and P is the power statistic value first time);
Can only use wherein a kind of algorithm in the method, and when the absolute value of verifying described direct current biasing offset is mistake, then two kinds of algorithms can intersect use.
Step 3, again the described background noise of described modulus conversion chip output is sampled, second sampled data that obtains is added the absolute value of the above direct current biasing offset, obtain the sampled data after the direct current biasing compensation.
Step 4, to the fixing power statistic of duration of the sampled data after the direct current biasing compensation, obtain power statistic value P1 for the second time, relatively for the first time power statistic value P with the second time power statistic value P1 obtain the symbol of direct current biasing offset:
If P〉P1, then the symbol of direct current biasing offset is for negative;
If P＜=P1, then the symbol of direct current biasing offset is for just;
In conjunction with the absolute value of described direct current biasing offset, obtain described direct current biasing offset again;
A kind of concrete execution mode, if P＜=P1, obtain direct current configuration offset after, also comprise: to the step that described direct current biasing offset is verified, specific as follows:
Step 401, the described background noise of described modulus conversion chip output is sampled, according to described direct current biasing offset, the 3rd sampled data that obtains is carried out the direct current biasing compensation;
Step 402, to the fixing power statistic of duration of the 3rd sampled data after the direct current biasing compensation, obtain power statistic value P2 for the third time;
Step 403, will be for the third time power statistic value P2 compare with power statistic value P for the first time: if P2＜P judges that then described direct current biasing offset is correct, execution in step 5; If P2 〉=P, judge that then described direct current biasing offset is wrong, stop the direct current biasing compensation and provide the compensation failure information.
The signal of step 5, the described modulus conversion chip receive path of connection, the signal that described modulus conversion chip is received according to described direct current biasing offset carries out the direct current biasing compensation.
The present invention also provides another embodiment of a kind of direct-current offset compensation method of modulus conversion chip, as Fig. 2, comprises that step is as follows:
The signal of step 1, cut-out modulus conversion chip receive path is sampled to the background noise of described modulus conversion chip output.
Step 2, to the fixing power statistic of duration of first sampled data that obtains, the power statistic value P first time that obtains, and according to following algorithm:
(K is the absolute value of direct current biasing offset, and N is the sample number of sampling, and P is the power statistic value first time) calculates the absolute value of direct current biasing offset;
Described fixedly duration, determine according to the accuracy requirement of calculating, duration is more long, precision is more high, and on the contrary, then precision is more low, fixedly duration can be set to different values according to user's request, in the present embodiment, that described fixedly duration adopts is 5ms, namely first sampled data that obtains is continued the power statistic of 5ms;
A kind of concrete execution mode behind the absolute value of calculating direct current biasing offset, also comprises: to the step that the absolute value of described direct current biasing offset is verified, specific as follows:
Absolute value and the thresholding of described direct current biasing offset are compared:
If the absolute value of described direct current biasing offset is not less than described thresholding, the absolute value of then judging described direct current biasing offset is wrong, returning step 1 samples to the described background noise of described modulus conversion chip output again, and recomputate the absolute value of direct current biasing offset according to this sampled data, and if add up to judge that the absolute value of described direct current biasing offset is that wrong number of times surpasses preset threshold value, then stop the direct current biasing compensation, and provide the compensation failure information; Described preset threshold value determines that according to the debugging situation of modulus conversion chip in the present embodiment, described preset threshold value is 3;
If the absolute value of described direct current biasing offset is less than described thresholding, the absolute value of then judging described direct current biasing offset is correct, execution in step 3; Described thresholding is the given value that the technical manual of modulus conversion chip provides;
In addition, as another kind of embodiment, also can adopt another kind of algorithm to calculate the absolute value of described direct current biasing offset, specifically:
(K is the absolute value of direct current biasing offset, and N is the sample number of sampling, and P is the power statistic value first time); Can only use wherein a kind of algorithm in the method, and when the absolute value of verifying described direct current biasing offset is mistake, then two kinds of algorithms can intersect use.
Step 3, again the described background noise of described modulus conversion chip output is sampled, second sampled data that obtains is deducted the absolute value of described direct current biasing offset, obtain the sampled data after the direct current biasing compensation;
Step 4, to the fixing power statistic of duration of the sampled data after the compensation of this direct current biasing, obtain power statistic value P1 for the second time, relatively for the first time power statistic value P with the second time power statistic value P1 obtain the symbol of direct current biasing offset:
If P〉P1, then the symbol of direct current biasing offset is for just;
If P＜=P1, then the symbol of direct current biasing offset is for negative;
In conjunction with the absolute value of described direct current biasing offset, obtain described direct current biasing offset again;
A kind of concrete execution mode, if P＜=P1, obtain the direct current biasing offset after, also comprise: to the step that described direct current biasing offset is verified, specific as follows:
Step 401, the described background noise of described modulus conversion chip output is sampled, according to described direct current biasing offset, the 3rd sampled data that obtains is carried out the direct current biasing compensation;
Step 402, to the fixing power statistic of duration of the sampled data after the direct current biasing compensation, obtain power statistic value P2 for the third time;
Step 403, will be for the third time power statistic value P2 compare with power statistic value P for the first time: if P2＜P judges that then described direct current biasing offset is correct, execution in step 5; If P2 〉=P, judge that then described direct current biasing offset is wrong, stop the direct current biasing compensation and provide the compensation failure information.
The signal of step 5, the described modulus conversion chip receive path of connection, the signal that described modulus conversion chip is received according to described direct current biasing offset carries out the direct current biasing compensation.
Above-described embodiment of the present invention does not constitute the restriction to protection range of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (6)
1. the direct-current offset compensation method of a modulus conversion chip is characterized in that, comprises that step is as follows:
The signal of step 1, cut-out modulus conversion chip receive path is sampled to the background noise of described modulus conversion chip output; Step 2, to the fixing power statistic of duration of first sampled data that obtains, the power statistic value P first time that obtains, and calculate the absolute value of direct current biasing offset according to following algorithm:
Or
K is the absolute value of direct current biasing offset, and N is the sample number of sampling, and P is the power statistic value first time;
Step 3, again the described background noise of described modulus conversion chip output is sampled, second sampled data that obtains is added the absolute value of the above direct current biasing offset, obtain the sampled data after the direct current biasing compensation;
Step 4, to the fixing power statistic of duration of the sampled data after the compensation of described direct current biasing, obtain power statistic value P1 for the second time, power statistic value P compares the symbol that obtains the direct current biasing offset with power statistic value P1 for the second time with the first time: if P〉P1, then the symbol of direct current biasing offset is for negative;
If P＜=P1, then the symbol of direct current biasing offset is for just;
The signal of step 5, the described modulus conversion chip receive path of connection, the signal that described modulus conversion chip is received according to described direct current biasing offset carries out the direct current biasing compensation.
2. the direct-current offset compensation method of modulus conversion chip according to claim 1 is characterized in that, behind the absolute value of calculating direct current biasing offset, also comprises the absolute value step of verifying described direct current biasing offset, and is specific as follows:
Absolute value and the thresholding of described direct current biasing offset are compared:
If the absolute value of described direct current biasing offset is not less than described thresholding, the absolute value of then judging described direct current biasing offset is wrong, return step 1 and again the described background noise of described modulus conversion chip output is sampled, and recomputate the absolute value of direct current biasing offset according to this sampled data and described algorithm;
If the absolute value of described direct current biasing offset is less than described thresholding, the absolute value of then judging described direct current biasing offset is correct, execution in step 3;
Described thresholding is the given value that the technical manual of modulus conversion chip provides.
3. the direct-current offset compensation method of modulus conversion chip according to claim 2, it is characterized in that, if it is that wrong number of times surpasses preset threshold value that accumulative total is judged the absolute value of described direct current biasing offset, then stops the direct current biasing compensation, and provide the compensation failure information.
4. the direct-current offset compensation method of a modulus conversion chip is characterized in that, comprises that step is as follows:
The signal of step 1, cut-out modulus conversion chip receive path is sampled to the background noise of described modulus conversion chip output; Step 2, to the fixing power statistic of duration of first sampled data that obtains, the power statistic value P first time that obtains, and calculate the absolute value of direct current biasing offset according to following algorithm:
Or
K is the absolute value of direct current biasing offset, and N is the sample number of sampling, and P is the power statistic value first time;
Step 3, again the described background noise of described modulus conversion chip output is sampled, second sampled data that obtains is deducted the absolute value of described direct current biasing offset, obtain the sampled data after the direct current biasing compensation;
Step 4, to the fixing power statistic of duration of the sampled data after the compensation of this direct current biasing, obtain power statistic value P1 for the second time, with the first time power statistic value P with the second time power statistic value P1 compare the symbol that obtains the direct current biasing offset:
If P〉P1, then the symbol of direct current biasing offset is for just;
If P＜=P1, then the symbol of direct current biasing offset is for negative;
The signal of step 5, the described modulus conversion chip receive path of connection, the signal that described modulus conversion chip is received according to described direct current biasing offset carries out the direct current biasing compensation.
5. the direct-current offset compensation method of modulus conversion chip according to claim 4 is characterized in that, behind the absolute value of calculating direct current biasing offset, also comprises the absolute value step of verifying described direct current biasing offset, and is specific as follows:
Absolute value and the thresholding of described direct current biasing offset are compared:
If the absolute value of described direct current biasing offset is not less than described thresholding, the absolute value of then judging described direct current biasing offset is wrong, return step 1 and again the described background noise of described modulus conversion chip output is sampled, and recomputate the absolute value of direct current biasing offset according to this sampled data and described algorithm;
If the absolute value of described direct current biasing offset is less than described thresholding, the absolute value of then judging described direct current biasing offset is correct, execution in step 3;
Described thresholding is the given value that the technical manual of modulus conversion chip provides.
6. the direct-current offset compensation method of modulus conversion chip according to claim 5, it is characterized in that, if it is that wrong number of times surpasses preset threshold value that accumulative total is judged the absolute value of described direct current biasing offset, then stops the direct current biasing compensation, and provide the compensation failure information.
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| CN110830075B (en) * | 2019-11-07 | 2021-09-14 | 成都九洲迪飞科技有限责任公司 | Zero-intermediate-frequency transceiving component analog-to-digital converter DC-removing method |
| CN112804618B (en) * | 2021-01-06 | 2022-07-29 | 昆腾微电子股份有限公司 | Audio output method and device |
| CN112817045B (en) * | 2021-01-28 | 2021-08-27 | 中国科学院地质与地球物理研究所 | Time domain desensitized direct current bias real-time removing device and method |
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