CN101115037A - Digital receiver and local oscillating frequency inceptive error calibrating method - Google Patents
Digital receiver and local oscillating frequency inceptive error calibrating method Download PDFInfo
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Abstract
The invention discloses a calibration method for a digital receiver and the initial error of the vibration frequency of the digital receiver. The invention comprises the following steps that : A. a signal generator is used for generating a reference monosyllabic signal and the signal is sent to the digital receiver; B. the digital receiver mixes a vibration signal and the reference syllabic signal, after a lo-pass filter sampling of the mixed signals, performs Fourier transformation on a sampling signal to get a digital baseband signal frequency; C. the vibration signal frequency is calculated and obtained according to the digital baseband signal frequency and the reference monosyllabic frequency; D. the initial error calibration of the vibration frequency is performed according to the vibration signal frequency and a nominal vibration signal frequency. The calibration method for the digital receiver and the initial error of the vibration frequency of the digital receiver can effectively increase the calibration speed and lower the calibration cost.
Description
Technical Field
The invention belongs to the field of wireless communication, and particularly relates to a digital receiver and a method for calibrating initial error of local oscillation frequency of the digital receiver.
Background
In a wireless communication system, in order to ensure the demodulation quality of a received signal, a digital receiver needs to ensure that the frequency error between the local oscillation frequency of the receiver and the frequency error of a signal carrier are smaller than a certain range, and the range has different requirements in different systems. When the receiver is in a correct receiving state, the receiver can calculate the frequency deviation of the local oscillation signal and the received signal by a channel estimation method and adjust the frequency deviation in time, so that the deviation of the local oscillation frequency and the carrier frequency of the received signal meets the design requirement of a system.
For a receiver to start to establish a receiving state, the frequency deviation between the local oscillator frequency and the carrier frequency of the received signal must be smaller than a certain design requirement to enable the receiver to correctly estimate the frequency deviation of the received signal and enter a correct receiving state. Due to the effects of device process variations and device non-uniformities, the initial frequency of the receiver oscillator output signal deviates from its nominal value. In order to make the initial frequency offset between the local oscillator frequency and the nominal frequency thereof meet the system design requirement, the receiver usually needs to be calibrated before leaving the factory, so that the error range thereof meets the system design requirement.
The method for calibrating the initial error of the local oscillation frequency of the existing receiver generally includes the steps of directly or indirectly measuring the frequency of a local oscillation signal by using a spectrum analyzer, calibrating according to the measured frequency and the nominal frequency of the measured frequency, calculating a frequency control word corresponding to the nominal frequency, and writing the obtained frequency control word into the receiver. Therefore, when the receiver is started, the frequency control word is subjected to digital-to-analog conversion to generate the control voltage of the oscillator, and the frequency of the output signal of the oscillator is controlled to be the nominal frequency, so that the adjusted local oscillator frequency meets the design requirement of the system. The disadvantage of this method is that it uses a relatively expensive spectrometer, and the calibration speed is slow, and the calibration data needs to be written into the receiver by other methods, and the system is relatively complex.
Disclosure of Invention
The invention aims to provide a digital receiver and a method for calibrating the initial error of the local oscillation frequency thereof so as to improve the calibration speed and reduce the calibration cost.
In order to solve the technical problems, the invention provides the following technical scheme:
a method for calibrating initial error of local oscillation frequency of a digital receiver comprises the following steps:
A. generating a reference tone signal by using a signal generator and outputting the reference tone signal to the digital receiver;
B. the digital receiver mixes the local oscillation signal with the reference single tone signal, samples the mixed signal after low-pass filtering, and performs Fourier transform on the sampled signal to obtain the frequency of a digital baseband signal;
C. calculating to obtain a local oscillator signal frequency according to the digital baseband signal frequency and the reference single tone signal frequency;
D. and calibrating the initial error of the local oscillator frequency according to the local oscillator signal frequency and the nominal frequency of the local oscillator signal.
Preferably, in the step C, when the frequency of the reference single tone signal is greater than the frequency of the local oscillator signal, the reference single tone signal is processed according to the frequency
Calculating to obtain the frequency of the local oscillator signal, and when the frequency of the reference single tone signal is less than the frequency of the local oscillator signal, calculating according to
Calculating to obtain the local oscillation frequency, wherein f o Is the local oscillator signal frequency, f ref For reference to the single-tone signal frequency,
the nominal frequency of the local oscillator signal is,
is the digital baseband signal frequency.
Preferably, in the step C, when the frequency of the reference single tone signal is greater than the frequency of the local oscillator signal, the reference single tone signal is processed according to the frequency
Calculating to obtain the frequency of the local oscillator signal, and when the frequency of the reference single tone signal is less than that of the local oscillator signal, calculating according to
Calculating to obtain the local oscillation frequency, wherein f o Is the local oscillator signal frequency, f ref For reference to the single-tone signal frequency,
is the digital baseband signal frequency.
Preferably, the step D specifically includes:
according to
Calculating to obtain a frequency control coefficient, wherein k is the frequency control coefficient, f o，c1 Is a frequency control word c 1 Corresponding local oscillator signal frequency, f o，c2 Is a frequency control word c 2 Corresponding local oscillator signal frequency;
according toCalculating to obtain a frequency control word corresponding to the nominal frequency of the local oscillator signal, wherein,
is a frequency control word corresponding to the nominal frequency of the local oscillator signal,
is a local oscillator signal nominal frequency of]Is a rounding operation.
Preferably, in the step a, the reference tone signal is further output to a plurality of digital receivers through a power divider.
A digital receiver comprises a voltage-controlled oscillator, a mixer, a low-pass filter, an analog-to-digital converter, a Fourier converter, a local oscillation signal frequency calculator, an error calibrator and a digital-to-analog converter, wherein:
the voltage controlled oscillator is used for generating a local oscillation signal;
the frequency mixer is used for receiving the local oscillator signal and the reference single tone signal output by the signal generator and mixing the local oscillator signal and the reference single tone signal;
a low-pass filter for low-pass filtering the mixing signal;
the analog-to-digital converter is used for sampling the filtered signal;
the Fourier converter is used for carrying out Fourier conversion on the sampling signal to obtain the frequency of the digital baseband signal;
the local oscillator signal frequency calculator is used for calculating to obtain a local oscillator signal frequency according to the digital baseband signal frequency and the reference single tone signal frequency;
the error calibrator is used for performing initial error calibration of the local oscillator frequency according to the local oscillator signal frequency and the local oscillator signal nominal frequency;
and the digital-to-analog converter is used for performing digital-to-analog conversion on the frequency control word obtained by calibration to generate the control voltage of the voltage-controlled oscillator.
Compared with the prior art, the invention has the beneficial effects that:
the equipment investment is less: compared with the prior art, the method saves an expensive spectrum analyzer, and can realize the initial error calibration of the local oscillation frequency of the multi-receiver by only using a single-tone signal generator with relatively low price;
the calibration speed is fast: in the invention, the receiver can calculate the actual frequency of the local oscillation signal by using a simple formula after performing FFT conversion on the baseband signal, for most digital receivers, the process can be completed within a few milliseconds, and the calibration of one receiver can be completed within a few seconds when the existing calibration system performs calibration by using a frequency spectrograph;
supporting multi-terminal calibration: the invention can support the simultaneous calibration of a plurality of receivers, theoretically, the number of the receivers supported by the invention is only limited by the output power of the signal generator;
the calibration cost is low: due to the fact that equipment investment is reduced and calibration efficiency is improved, calibration time of the receiver and instrument and equipment cost are greatly reduced.
Drawings
FIG. 1 is a flow chart of a method for calibrating an initial error of a local oscillation frequency of a digital receiver according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of an input signal at an RF port of a digital receiver;
FIG. 3 is a schematic diagram of an analog baseband signal after frequency conversion;
FIG. 4 is a block diagram of a digital receiver according to a preferred embodiment of the present invention;
fig. 5 shows an example of an application of the method of the present invention to simultaneously calibrate a plurality of digital receivers.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The invention utilizes a signal generator to generate a reference single tone signal, a digital receiver receives the reference single tone signal and then measures the frequency of the signal after frequency conversion in a digital baseband, calculates the local oscillation signal frequency of the receiver according to the measured digital baseband signal frequency and the reference single tone signal frequency, and calibrates according to the local oscillation signal frequency and the local oscillation signal nominal frequency to ensure that the initial error of the local oscillation frequency meets the requirement of system design.
Referring to fig. 1, a method for calibrating an initial error of a local oscillation frequency of a digital receiver according to a preferred embodiment of the present invention includes the following steps:
let S ref Is a sine wave signal generated by a signal generator and having a frequency f ref (ii) a Local oscillation signal of receiver is S o At a frequency of f o And satisfies the relationship f o ＜f ref (ii) a The channel bandwidth of the receiver is BW, and the relationship is satisfied:
102, the digital receiver mixes the local oscillation signal with the reference single tone signal, samples the mixed signal after low-pass filtering, and performs Fourier transform on the sampled signal to obtain the frequency of a digital baseband signal;
the relationship between the reference tone signal and the local oscillator signal at the mixer input of the digital receiver is shown in fig. 2. Inside the mixer, two paths of input signals are subjected to multiplication operation to realize frequency spectrum shifting. At the receiver analog baseband, the spectrum of the signal is shown in fig. 3. In the digital baseband, fourier transform is carried out on the received signal to obtain the frequency of the digital baseband signal
Here, it should be noted that f o ＜f ref The definition of (A) is only made for the convenience of the subsequent formula derivation processThe assumption that the method is also fully applicable to f o ＞f ref Only the formula derivation process and the results will be slightly different.
103, calculating to obtain a local oscillation signal frequency according to the digital baseband signal frequency and the reference single tone signal frequency;
reference tone signal S input to digital receiver ref Can be expressed as:
S ref ＝Acos(2πf ref t+) (2)
the receiver local oscillator signal may be expressed as:
S o ＝Bcos(2πf o t+θ) (3)
in the mixer, a reference tone signal and a local oscillator signal are multiplied to generate a new spectral component S abb ：
For analog baseband signals, the high frequency terms are filtered out due to the effect of the low pass filter, so the above equation can be further simplified as:
wherein, f = f ref -f o (ii) a Phi = 58388and theta, f is the frequency of the analog baseband signal. To this end, the frequency of the local oscillator signal of the receiver may be expressed as:
f o ＝f ref -f (6)
setting the nominal frequency of the output signal of the local oscillator to
Then the frequency error coefficient k of the output signal of the local oscillator err Can be expressed as:
that is to say that the first and second electrodes,
for an analog baseband signal, whose actual frequency is f, there is according to equation (6):
f＝f ref -f o (8)
in digital receiver systems, the operating clocks for the rf and baseband circuits are usually generated from the same oscillator output signal by a phase locked loop circuit, so that the sampling clock frequency in the system has the same error factor as the output signal frequency of the voltage controlled oscillator before the system clock is accurately calibrated. The frequency of the digital baseband signal obtained by Fourier transform due to the error of the sampling clock
There is also an error coefficient that is the same frequency as the sampling clock, but of opposite sign. That is, if the sampling frequency increases by α times due to an error, the frequency of the digital baseband signal obtained by fourier transform decreases by α times.
Thus, the frequency value of the digital baseband signal can be expressed as (ignoring frequency calculation errors due to finite sampling points here):
namely:
according to the formulas (8) and (10):
the transformation of the above equation can result in:
to this end, the local oscillator signal frequency f o Can be expressed as:
according to equation (11), the local oscillator signal frequency can be represented as:
when k is err When & lt 1, the local oscillation frequency f of digital receiver o Can be approximately expressed as:
when the frequency error coefficient is much smaller than 1, the local oscillation frequency error can be approximately expressed by equation (15). Compared with the formula (13), the calculation method of the formula (15) has no division operation, so that the operation amount can be effectively reduced, and the approximation error caused by the operation amount can be ignored. For example, if
f erf ＝900.050000MHz，
Calculated according to equation (13), f o =900.0099996MHz, and calculated according to equation (15), f o =900.010000MHz, both phasesAs can be seen, the error in the calculation of the two equations is less than 0.5Hz.
Similarly, for f o ＞f ref In the case of (1), equations (13) and (15) are changed to:
and step 104, calibrating the initial error of the local oscillation frequency according to the frequency of the local oscillation signal and the nominal frequency of the local oscillation signal.
After the local oscillator signal frequency is calculated, calibration can be performed according to the local oscillator signal frequency and the nominal frequency thereof, a frequency control word corresponding to the nominal frequency is calculated, and the obtained frequency control word is stored. Therefore, when the receiver is started, the frequency control word is subjected to digital-to-analog conversion to generate the control voltage of the oscillator, and the frequency of the output signal of the oscillator is controlled to be the nominal frequency, so that the adjusted local oscillation frequency meets the design requirement of the system.
In a digital receiver, a voltage-controlled oscillator is typically used to generate a system base clock, and then a phase-locked loop circuit is used to generate clock signals (including local oscillator signals of the receiver) required for the operation of the various subsystems. Because the frequency of the output clock and the frequency of the input clock of the phase-locked loop circuit keep a constant proportional relation when the phase-locked loop circuit is in a locked state, the existence of the phase-locked loop circuit can be ignored, and the relation between the control signal and the local oscillation signal frequency can be directly established. And adjusting a frequency control word c according to the local oscillation signal frequency and the local oscillation signal nominal frequency, wherein the frequency control word c generates control voltage of the oscillator after digital-to-analog conversion and controls the output signal frequency of the oscillator.
For a voltage-controlled oscillator, there is a one-to-one correspondence between the output signal frequency and the input voltage, and this relationship can be generally approximated by a first order equation within the allowable range of the control voltage, that is:
f o，c ＝k·(c-c min )+f o，cmin (c min ≤c≤c max ) (16)
where k denotes a frequency control coefficient, f o，c Indicating the receiver local oscillator frequency to which the frequency control word c corresponds. c. C max And c min Are the maximum and minimum values of the frequency control word, which are determined by the voltage-controlled oscillator type and the conversion relation of the digital-to-analog converter。
In the actual calibration process, the frequency control coefficient k can be obtained by a method of two times of calibration. I.e. setting the frequency control word as c first 1 Obtaining the corresponding local oscillator signal frequency f through the above steps 201 to 203 o，c1 Then setting the frequency control word to c 2 Similarly, the corresponding local oscillator signal frequency f is obtained through the above steps 201 to 203 o，c2 Then the frequency control coefficient can be expressed as:
after the frequency control coefficient is obtained through calculation, the control word corresponding to the nominal frequency of the voltage-controlled oscillator
Can be expressed as:
wherein [ ] represents rounding.
Please refer to fig. 4, which is a schematic structural diagram of a digital receiver for implementing the above method. The digital receiver comprises a voltage controlled oscillator 10, a mixer 20, a low pass filter 30, an analog to digital converter 40, a fourier transformer 50, a local oscillator signal frequency calculator 60, an error calibrator 70 and a digital to analog converter 80. Wherein:
and the voltage-controlled oscillator 10 is used for generating local oscillation signals.
The mixer 20 is configured to receive the local oscillator signal and the reference tone signal output by the signal generator 90, and mix the local oscillator signal and the reference tone signal.
A low pass filter 30 for low pass filtering the mixing signal, and for the analog baseband signal, the high frequency term is filtered out due to the effect of the low pass filter 30.
An analog-to-digital converter 40 for sampling the filtered signal.
And a fourier transformer 50 for performing fourier transform on the sampling signal to obtain a digital baseband signal frequency.
And a local oscillator signal frequency calculator 60, configured to calculate a local oscillator signal frequency according to the digital baseband signal frequency and the reference single-tone signal frequency.
And when the frequency of the reference single-tone signal is greater than the frequency of the local oscillator signal, calculating according to the formula (13) to obtain the frequency of the local oscillator signal, and when the frequency of the reference single-tone signal is less than the frequency of the local oscillator signal, calculating according to the formula (13') to obtain the frequency of the local oscillator signal.
As described above, in order to reduce the amount of calculation, when the frequency error coefficient is much smaller than 1, the local oscillation frequency may be obtained by approximate calculation. Namely: and when the frequency of the reference single-tone signal is greater than the frequency of the local oscillator signal, calculating according to the formula (15) to obtain the frequency of the local oscillator signal, and when the frequency of the reference single-tone signal is less than the frequency of the local oscillator signal, calculating according to the formula (15') to obtain the frequency of the local oscillator signal.
And the error calibrator 70 is configured to perform local oscillation frequency initial error calibration according to the local oscillation signal frequency and the local oscillation signal nominal frequency.
After the local oscillator signal frequency is calculated, calibration can be performed according to the local oscillator signal frequency and the nominal frequency thereof, a frequency control word corresponding to the nominal frequency is calculated, and the obtained frequency control word is stored. The error calibrator 70 first obtains the frequency control coefficient according to the equation (17), and then obtains the control word corresponding to the nominal frequency of the vco according to the equation (18).
The digital-to-analog converter 80 is configured to perform digital-to-analog conversion on the frequency control word to generate a control voltage of the voltage-controlled oscillator 10, and control the frequency of the output signal of the oscillator 10 to be the nominal frequency thereof, so that the adjusted local oscillation frequency meets the system design requirement.
As can be known from the above process of calibrating the initial error of the local oscillation frequency of the digital receiver, the reference tone signal generated by the signal generator is kept unchanged during the whole calibration process, and all calibration operations are completed inside the digital receiver. By using this feature, simultaneous calibration of multiple digital receivers using the same signal generator can be achieved.
An example of an application of the method of the present invention to simultaneously calibrate multiple digital receivers is described below.
Referring to fig. 5, a system for calibrating local oscillation frequency initial errors of multiple receivers simultaneously mainly comprises a control host, a signal generator, a power distributor, a calibration tool, and a digital receiver to be calibrated. The signal generator is used for generating a calibration reference signal S ref ，S ref And enters the digital receiver after passing through the power divider. The control host is mainly used for controlling the working state of the signal generator and controlling the digital receiver to start and stop the calibration process, store the calibration data and the like.
The calibration process of the multi-receiver can be roughly divided into four steps of station detection, starting a signal generator, a calibration process and data storage.
Station detection: the station detection process mainly comprises the steps of judging whether a digital receiver to be calibrated exists in each station, and sending information such as frequency information of a reference signal to the digital receiver so that the digital receiver can calculate the frequency of a local oscillation signal.
Starting a signal generator: the start signal generator mainly controls the host configuration signal generator to generate the reference signal S required by calibration ref 。
And (3) calibration process: after the signal generator enters a normal working state, the control host can inform the digital receiver to start a frequency calibration process. After the calibration process is finished, the receiver can send the data obtained by calibration to the control host, and then waits for the instruction of the control host. The control host can judge the validity of the calibration data according to the historical data so as to determine the next action.
And (3) data storage: if the control host determines that the calibration data is valid after checking, the receiver can be informed to store the calibration data.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or substituted with equivalents without departing from the spirit scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (9)
1. A method for calibrating the initial error of the local oscillation frequency of a digital receiver is characterized by comprising the following steps:
A. generating a reference tone signal by using a signal generator and outputting the reference tone signal to the digital receiver;
B. the digital receiver mixes the local oscillator signal with the reference single tone signal, samples the mixed signal after low-pass filtering, and performs Fourier transform on the sampled signal to obtain the frequency of a digital baseband signal;
C. calculating to obtain a local oscillator signal frequency according to the digital baseband signal frequency and the reference single tone signal frequency;
D. and calibrating the initial error of the local oscillator frequency according to the local oscillator signal frequency and the nominal frequency of the local oscillator signal.
2. The method of claim 1, wherein:
in the step C, when the frequency of the reference single tone signal is greater than that of the local oscillator signal, the method is based on
Calculating to obtain the frequency of the local oscillator signal, and when the frequency of the reference single tone signal is less than the frequency of the local oscillator signal, calculating according to
Calculating to obtain the local oscillation frequency, wherein f o Is the local oscillator signal frequency, f ref For reference to the single-tone signal frequency,
the nominal frequency of the local oscillator signal is,
is the digital baseband signal frequency.
3. The method of claim 1, wherein:
in the step C, when the frequency of the reference single tone signal is greater than that of the local oscillator signal, the method is based on
Calculating to obtain the frequency of the local oscillator signal, and when the frequency of the reference single tone signal is less than the frequency of the local oscillator signal, calculating according to
Calculating to obtain the local oscillation frequency, wherein f o Is the local oscillator signal frequency, f ref For reference to the single-tone signal frequency,
is the digital baseband signal frequency.
4. The method according to claim 1, wherein said step D specifically comprises:
according to
Calculating to obtain a frequency control coefficient, wherein k is the frequency control coefficient, f o，c1 Is a frequency control word c 1 Corresponding local oscillator signal frequency, f o，c2 Is a frequency control word c 2 Corresponding local oscillator signal frequency;
according to
Calculating to obtain a frequency control word corresponding to the nominal frequency of the local oscillator signal, wherein,
is a frequency control word corresponding to the nominal frequency of the local oscillation signal,
for the nominal frequency of the local oscillator signal]Is a rounding operation.
5. The method of claim 1, wherein:
in the step a, the reference tone signal is further output to a plurality of digital receivers through a power divider.
6. A digital receiver comprises a voltage-controlled oscillator, a frequency mixer, a low-pass filter, an analog-to-digital converter, a Fourier converter and a digital-to-analog converter, and is characterized by also comprising a local oscillation signal frequency calculator and an error calibrator, wherein:
the voltage-controlled oscillator is used for generating local oscillation signals;
the frequency mixer is used for receiving the local oscillator signal and the reference single tone signal output by the signal generator and mixing the local oscillator signal and the reference single tone signal;
a low-pass filter for low-pass filtering the mixing signal;
the analog-to-digital converter is used for sampling the filtered signal;
the Fourier converter is used for carrying out Fourier conversion on the sampling signal to obtain the frequency of the digital baseband signal;
the local oscillator signal frequency calculator is used for calculating to obtain a local oscillator signal frequency according to the digital baseband signal frequency and the reference single tone signal frequency;
the error calibrator is used for performing initial error calibration of the local oscillator frequency according to the local oscillator signal frequency and the local oscillator signal nominal frequency;
and the digital-to-analog converter is used for performing digital-to-analog conversion on the frequency control word obtained by calibration to generate a control voltage of the voltage-controlled oscillator.
7. The digital receiver of claim 6, wherein the local oscillator signal frequency calculator is further to:
when the frequency of the reference single tone signal is greater than that of the local oscillator signal, according to
Calculating to obtain the frequency of the local oscillator signal, and when the frequency of the reference single tone signal is less than that of the local oscillator signal, calculating according to
Calculating to obtain the frequency of the local oscillator signal, wherein f o Is the local oscillator signal frequency, f ref In order to refer to the single-tone signal frequency,is composed ofThe nominal frequency of the local oscillator signal is,
is the digital baseband signal frequency.
8. The digital receiver of claim 6, wherein the local oscillator signal frequency calculator is further to:
when the frequency of the reference single tone signal is greater than that of the local oscillator signal, according to
Calculating to obtain the frequency of the local oscillator signal, and when the frequency of the reference single tone signal is less than the frequency of the local oscillator signal, calculating according to
Calculating to obtain the local oscillation frequency, wherein f o Is the local oscillator signal frequency, f ref In order to refer to the single-tone signal frequency,
for digital baseband signal frequency。
9. The digital receiver of claim 6, wherein the error calibrator is further configured to:
according toCalculating to obtain a frequency control coefficient, wherein k is the frequency control coefficient, f o，c1 Is a frequency control word c 1 Corresponding local oscillator signal frequency, f o，c2 Is a frequency control word c 2 Corresponding local oscillator signal frequency;
according to
Calculating to obtain a frequency control word corresponding to the nominal frequency of the local oscillator signal, wherein,
is a frequency control word corresponding to the nominal frequency of the local oscillation signal,
is a local oscillator signal nominal frequency of]Is a rounding operation.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447663A (en) * | 2010-10-07 | 2012-05-09 | 美信集成产品公司 | Digital correction of analog polyphase filters |
| CN102447663B (en) * | 2010-10-07 | 2016-12-14 | 马克西姆综合产品公司 | The less digit correction method of Simulating Multiphase wave filter and receiver |
| CN109030938A (en) * | 2017-06-08 | 2018-12-18 | 许继集团有限公司 | A kind of anti-harmonic wave frequency measuring method and device based on sine filtering |
| CN113328744A (en) * | 2021-04-29 | 2021-08-31 | 郑州中科集成电路与信息系统产业创新研究院 | Method for calibrating high-precision PLL output frequency in broadband transceiver chip |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6704374B1 (en) * | 2000-02-16 | 2004-03-09 | Thomson Licensing S.A. | Local oscillator frequency correction in an orthogonal frequency division multiplexing system |
| US6928275B1 (en) * | 2000-05-08 | 2005-08-09 | Qualcomm Incorporated | Method and apparatus for compensating local oscillator frequency error |
| FI20001289A (en) * | 2000-05-30 | 2001-12-01 | Nokia Mobile Phones Ltd | Method and arrangement for reducing frequency offset in a radio receiver |
-
2007
- 2007-08-13 CN CN2007101202227A patent/CN101115037B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447663A (en) * | 2010-10-07 | 2012-05-09 | 美信集成产品公司 | Digital correction of analog polyphase filters |
| CN102447663B (en) * | 2010-10-07 | 2016-12-14 | 马克西姆综合产品公司 | The less digit correction method of Simulating Multiphase wave filter and receiver |
| CN109030938A (en) * | 2017-06-08 | 2018-12-18 | 许继集团有限公司 | A kind of anti-harmonic wave frequency measuring method and device based on sine filtering |
| CN113328744A (en) * | 2021-04-29 | 2021-08-31 | 郑州中科集成电路与信息系统产业创新研究院 | Method for calibrating high-precision PLL output frequency in broadband transceiver chip |
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