CN102340307B - Voltage-controlled oscillator device and correction method for voltage-controlled oscillator - Google Patents
Voltage-controlled oscillator device and correction method for voltage-controlled oscillator Download PDFInfo
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- CN102340307B CN102340307B CN201110303167.1A CN201110303167A CN102340307B CN 102340307 B CN102340307 B CN 102340307B CN 201110303167 A CN201110303167 A CN 201110303167A CN 102340307 B CN102340307 B CN 102340307B
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Abstract
The invention discloses a voltage-controlled oscillator device and a correction method for a voltage-controlled oscillator. The voltage-controlled oscillator device comprises a predistortion module and the voltage-controlled oscillator, wherein the predistortion module is used for performing predistortion processing on input voltage to obtain predistorted voltage; the voltage-controlled oscillator is used for generating an output signal with corresponding oscillation frequency according to the predistorted voltage; and the predistortion module corrects the nonlinear characteristics of the voltage-controlled oscillator so as to realize linear relationships between the input voltage and the oscillation frequency of the output signal. The voltage-controlled oscillator device can be applied to a phase-locked loop circuit of a communication system.
Description
Technical field
The present invention relates to the bearing calibration of voltage controlled oscillator device and voltage controlled oscillator, more specifically relate to the voltage controlled oscillator device of high linearity and the large range of linearity.
Background technology
Voltage controlled oscillator is one of extremely important basic composition module of phase-locked loop circuit in Modern Communication System, the performance of voltage controlled oscillator has determined the technical performance of phase-locked loop circuit to a great extent, and the technical performance of phase-locked loop circuit has determined the technical performance of Modern Communication System to a great extent, so the performance of voltage controlled oscillator has determined the technical performance of Modern Communication System to a great extent.
Along with the continuous progress of integrated circuit technology, the characteristic size of device and metal connecting line is also constantly being dwindled, and the range of linearity and the linearity of device are restricted.
Fig. 1 shows the schematic block diagram of traditional voltage controlled oscillator (VCO) 11.In traditional voltage controlled oscillator 11, input voltage vin is applied directly to the input of voltage controlled oscillator 11, and exports at the output of voltage controlled oscillator 11 output signal that frequency of oscillation is f, is shown below:
f＝f0+k*vin (1)
Wherein,
F is the frequency of oscillation of the output signal of voltage controlled oscillator input control signal magnitude of voltage while being vin;
F0 is that voltage controlled oscillator input control signal magnitude of voltage is the frequency of the output voltage signal of 0 o'clock;
Vin is the magnitude of voltage of voltage controlled oscillator input control signal;
K is the controlling elements of frequency of oscillation of the output signal of voltage controlled oscillator.
Fig. 2 shows the input voltage of the traditional voltage controlled oscillator 11 shown in Fig. 1 and the ideal relationship curve between frequency of oscillation.The range of linearity of traditional voltage controlled oscillator 11 is-vin
max≤ vin≤+ vin
maxthe range of linearity, wherein k is the constant that only depends on the electrology characteristic of voltage controlled oscillator 11 circuit.
Yet the range of linearity of voltage controlled oscillator 11 has just been ignored the approximately linear scope of device higher-order effect, but not real ideal linearity scope.Even-vin
max≤ vin≤+ vin
maxthe range of linearity, the constant that k neither be real, as shown in phantom in Figure 3.
In order to improve the linearity of voltage controlled oscillator and to expand its range of linearity, just k can not be approximately to constant.
Summary of the invention
The object of this invention is to provide a kind of high linearity and the large voltage controlled oscillator device of the range of linearity and the bearing calibration of voltage controlled oscillator.
According to an aspect of the present invention, provide a kind of voltage controlled oscillator device, comprising: predistortion module, for input voltage being carried out to pre-distortion to obtain the voltage (predistortedvoltage) of predistortion; And voltage controlled oscillator, for produce the output signal with corresponding frequency of oscillation according to the voltage of predistortion, wherein, predistortion module is proofreaied and correct the nonlinear characteristic of voltage controlled oscillator, and making between input voltage and the frequency of oscillation of output signal is linear relationship.
According to a further aspect in the invention, provide a kind of bearing calibration of voltage controlled oscillator, comprising: the predistortion function of measuring voltage controlled oscillator; In predistortion module, store predistortion function; Utilize predistortion module to carry out pre-distortion to obtain the voltage of predistortion to input voltage; The voltage of predistortion is offered to voltage controlled oscillator; And utilize voltage controlled oscillator according to the voltage of predistortion, to produce the output signal with corresponding frequency of oscillation, wherein, predistortion module is proofreaied and correct the nonlinear characteristic of voltage controlled oscillator, and making between input voltage and the frequency of oscillation of output signal is linear relationship.
Voltage controlled oscillator device of the present invention utilizes predistortion module to proofread and correct the nonlinear characteristic of voltage controlled oscillator, thereby can improve the linearity of voltage controlled oscillator and/or the range of linearity of expansion voltage controlled oscillator.
Accompanying drawing explanation
Fig. 1 shows the schematic block diagram of traditional voltage controlled oscillator.
Fig. 2 shows the input voltage of the traditional voltage controlled oscillator shown in Fig. 1 and the ideal relationship curve between frequency of oscillation.
Fig. 3 shows the input voltage of the traditional voltage controlled oscillator shown in Fig. 1 and the actual relationship curve between frequency of oscillation.
Fig. 4 shows according to the schematic block diagram of the measuring circuit of the predistortion function for generation of voltage controlled oscillator of the present invention.
Fig. 5 shows the schematic block diagram according to voltage controlled oscillator device of the present invention.
Fig. 6 shows the input voltage of the voltage controlled oscillator device shown in Fig. 5 and the actual relationship curve between frequency of oscillation.
Fig. 7 shows the schematic block diagram of the first example of the predistortion module of using in the voltage controlled oscillator device shown in Fig. 5.
Fig. 8 shows the schematic block diagram of the second example of the predistortion module of using in the voltage controlled oscillator device shown in Fig. 5.
Embodiment
The inventor recognizes by the input voltage of voltage controlled oscillator 11 is carried out to pre-distortion, can compensate the variation of controlling elements k, thereby the linearity output of voltage controlled oscillator 11 is provided.
In order to carry out pre-distortion, need to obtain in advance the predistortion function v of voltage controlled oscillator 11
predistortion(vin).Predistortion function v
predistortion(vin) represent the relation between input voltage vin and the voltage vin ' of predistortion.Although may exist the variation of controlling elements k, between input voltage vin and the frequency of oscillation f of voltage controlled oscillator 11, still meet linear relationship.
Hereinafter with reference to accompanying drawing, the present invention is described in more detail.
Fig. 4 shows according to the schematic block diagram of the measuring circuit 10 of the predistortion function for generation of voltage controlled oscillator 11 of the present invention.Input at voltage controlled oscillator 11 connects controllable voltage source 12, be used to the input of voltage controlled oscillator 11 that variable input voltage vin is provided, the scope of this input voltage vin is the range of linearity of design, and can be greater than the range of linearity of voltage controlled oscillator 11 self-characteristics, for example-vin '
max≤ vin≤+ vin '
max, vin wherein
max' > vin
max.Output at voltage controlled oscillator 11 connects signal frequency tester 13, for measuring the frequency of oscillation f of the output signal of voltage controlled oscillator 11.
Voltage controlled oscillator 11 can be RC voltage controlled oscillator, LC voltage controlled oscillator, phase noise or active voltage controlled oscillator.
For the sampled point of selecting, set input voltage vin, according to formula (1), calculate the frequency of oscillation f of corresponding output signal.Then, when adjusting the output voltage of controllable voltage source 12, utilize signal frequency tester 13 to measure the actual oscillation frequency of the output signal of voltage controlled oscillator 11.During the frequency of oscillation f that is the output signal calculated in the actual oscillation frequency of the output signal of voltage controlled oscillator 11, the voltage vin ' using the actual output voltage of controllable voltage source 12 as predistortion.Thereby, for the sampled point of selecting, obtain the relation between input voltage vin and the voltage vin ' of predistortion.
-vin '
max≤ vin≤+ vin '
maxscope in, for the sampled point of each selection, repeat above-mentioned adjustment and measuring process.Thereby, for a plurality of sampled points of the service area of designing, obtain the relation between input voltage vin and the voltage vin ' of predistortion, as the predistortion function of voltage controlled oscillator 11.
Can carry out uniform sampling, according to uniform voltage spaces, obtain the value of the voltage vin ' of input voltage vin and predistortion.Also can carry out nonuniform sampling, according to the linear character of voltage controlled oscillator 11, select sampled point.Lower at the less sampling point density of vin absolute value, at vin absolute value, more approach vin '
maxtime sampling point density higher.
Can realize predistortion function v by digital lookup table mode
predistortion(v), wherein in form, preserve vin and corresponding vin ', set up the mapping relations of vin-vin '.
Fig. 5 shows according to the schematic block diagram of voltage controlled oscillator device 20 of the present invention.Compare with traditional voltage controlled oscillator 11, voltage controlled oscillator device 20 of the present invention has increased predistortion module (predistortion module) 14 between input voltage vin and voltage controlled oscillator 11.Predistortion module 14 is for carrying out voltage transformation, according to aforesaid predistortion function v
predistortion(v) input voltage vin is made to pre-distortion, produce the voltage vin ' of predistortion, and offer voltage controlled oscillator 11.
When predistortion module 14 is carried out pre-distortion, first judge whether input voltage vin exceeds the range of linearity of design ,-vin '
max≤ vin≤+ vin '
max.If exceed the range of linearity of design, predistortion module 14 is not carried out pre-distortion to this input voltage vin.
Fig. 6 shows the input voltage vin (being input voltage) of the voltage controlled oscillator device 20 shown in Fig. 5 and the actual relationship curve (solid line) between frequency of oscillation f, wherein also shows the actual input voltage vin ' (voltage of predistortion) of voltage controlled oscillator 11 and the actual relationship curve (dotted line) between frequency of oscillation f.
As shown in the dotted line in Fig. 6, if the actual input voltage of voltage controlled oscillator 11 exceeds the range of linearity of voltage controlled oscillator 11, k has not been constant.Only limit to-the vin of the range of linearity of traditional voltage controlled oscillator 11
max≤ vin≤+ vin
max, and in this range of linearity, be still subject to the impact of the higher-order effect of voltage controlled oscillator 11, and can not obtain desirable linear characteristic.
Yet shown in the horizontal dotted line in Fig. 6, for input voltage vin, predistortion module 14 produces the voltage vin ' of predistortion according to predistortion function.Because the actual input voltage of voltage controlled oscillator 11 is voltage vin ' of predistortion, so the frequency of oscillation of the output signal of voltage controlled oscillator 11 is f=f0+k0*vin, also, between input voltage vin and the frequency of oscillation f of output signal, is linear relationship.
Because predistortion module 14 has compensated the nonlinear characteristic of voltage controlled oscillator 11, therefore ,-vin '
max≤ vin≤+ vin '
maxscope in, between the input voltage vin of voltage controlled oscillator device 20 and the frequency of oscillation f of output signal, be linear relationship.The range of linearity of voltage controlled oscillator device 20 is not only larger than the range of linearity of voltage controlled oscillator 11, and the linearity is higher than voltage controlled oscillator 11.
In voltage-controlled oscillation unit 20 of the present invention, according to vin-vin ' mapping relations, set up predistortion module 14.
Fig. 7 shows the schematic block diagram of the first example of the predistortion module 14 of using in the voltage controlled oscillator device 20 shown in Fig. 5.Although described hereinafter the input voltage vin of predistortion module 14 and as the voltage vin ' of the predistortion of its output, should be appreciated that in voltage controlled oscillator device 20, the voltage vin ' of predistortion is the actual input voltage of voltage controlled oscillator 11.
As shown in Figure 7, predistortion module 14 comprises analog to digital converter (ADC) 1401, address decoding circuitry (DEC) 1402, memory (MEM) 1403 and the digital to analog converter (DAC) 1404 connecting successively.Input at analog to digital converter 1401 provides input voltage vin, and analog to digital converter 1401 is converted to input voltage vin digital signal and is sent to address decoding circuitry 1402.Address decoding circuitry 1402 produces the read operation address of memory 1403 according to digitized input voltage vin, and memory 1403 is carried out to read operation, obtains the digital value of the voltage vin ' of the predistortion corresponding with input voltage vin.Digital to analog converter 1404 converts the digital value of the voltage vin ' of predistortion to the analogue value, and offers voltage controlled oscillator 11 as the voltage vin ' of predistortion.
In this predistortion module 14, predistortion function is stored in memory 1403, and wherein input voltage vin is the read operation address of memory 1403, and the voltage vin ' of predistortion is the storage content of memory 1403.
Fig. 8 shows the schematic block diagram of the second example of the predistortion module 14 of using in the voltage controlled oscillator device shown in Fig. 5.Predistortion module 14 comprises analog to digital converter (ADC) 1401, micro controller unit (MCU) 1405 and the digital to analog converter (DAC) 1404 connecting successively.Input at analog to digital converter 1401 provides input voltage vin, and analog to digital converter 1401 is converted to input voltage vin digital signal and is sent to micro controller unit 1405.Micro controller unit 1405 is arranged in the look-up table of internal memory according to digitized input voltage vin search, obtain the digital value of the voltage vin ' of the predistortion corresponding with input voltage vin.Digital to analog converter 1404 converts the digital value of the voltage vin ' of predistortion to the analogue value, and offers voltage controlled oscillator 11 as the voltage vin ' of predistortion.
In this predistortion module 14, predistortion function is the look-up table in the internal memory of micro controller unit 1405, and wherein the voltage vin ' of input voltage vin and predistortion is two row of look-up table.
In a preferred embodiment, if the storage content of predistortion function does not comprise input voltage vin, predistortion module 14 is retrieved the corresponding output voltage of immediate input voltage in the storage content of predistortion function, as the voltage vin ' of the corresponding predistortion of this input voltage vin.
In a preferred embodiment, predistortion module 14 can also comprise interpolation circuit.If the storage content of predistortion function does not comprise input voltage vin, and-vin '
max≤ vin≤+ vin '
max, predistortion module 14 is retrieved upper and lower neighbour vin in the storage content of predistortion function
l, vin
h, and the voltage vin of corresponding predistortion
l', vin
h', and utilize interpolation circuit by the voltage vin ' of the interpolation calculation predistortion corresponding with input voltage vin:
vin’＝vin’
L+(vin’
H-vin’
L)/(vin
H-vin
L)*(vin-vin
L)。
More than describing is for example explanation and description the present invention, but not is intended to exhaustive and restriction the present invention.Therefore, the present invention is not limited to described embodiment.For obviously known modification or change of those skilled in the art, all within protection scope of the present invention.
Claims (17)
1. a voltage controlled oscillator device, comprising:
Predistortion module, for input voltage being carried out to pre-distortion to obtain the voltage of predistortion, the voltage that described predistortion module obtains predistortion comprises:
For the set point of input voltage, calculate the calculated value of the frequency of oscillation of the output signal while meeting linear relationship, the set point of this input voltage is as input voltage;
To voltage controlled oscillator, apply input voltage;
Adjust input voltage, measure the actual oscillation frequency of the output signal of voltage controlled oscillator simultaneously; And
When the actual oscillation frequency of the output signal of voltage controlled oscillator equals the calculated value of frequency of oscillation of output signal, the voltage using the actual value of input voltage as predistortion; And
Voltage controlled oscillator, for produce the output signal with corresponding frequency of oscillation according to the voltage of predistortion,
Wherein, predistortion module is proofreaied and correct the nonlinear characteristic that exceeds the range of linearity of voltage controlled oscillator and the higher-order effect in the range of linearity, and making between input voltage and the frequency of oscillation of output signal is linear relationship.
2. voltage controlled oscillator device according to claim 1, wherein voltage controlled oscillator is to be selected from a kind of in RC voltage controlled oscillator, LC voltage controlled oscillator, phase noise, active voltage controlled oscillator.
3. voltage controlled oscillator device according to claim 1, predistortion module storage predistortion function wherein, the relation between this predistortion function representation input voltage and the voltage of predistortion.
4. voltage controlled oscillator device according to claim 3, wherein predistortion module comprises analog to digital converter, address decoding circuitry, memory and the digital to analog converter connecting successively, analog to digital converter converts input voltage to digital value, address decoding circuitry produces the read operation address of memory and memory is carried out to read operation according to digitized input voltage, obtain the digital value of the voltage of predistortion, digital to analog converter converts the digital value of the voltage of predistortion to the analogue value, and wherein predistortion function is the storage content of memory.
5. voltage controlled oscillator device according to claim 3, wherein predistortion module comprises analog to digital converter, micro controller unit and the digital to analog converter connecting successively, analog to digital converter converts input voltage to digital value, micro controller unit is according to the look-up table in digitized input voltage retrieval internal memory, obtain the digital value of the voltage of predistortion, digital to analog converter converts the digital value of the voltage of predistortion to the analogue value, and wherein predistortion function is two row of look-up table.
6. according to the voltage controlled oscillator device described in claim 4 or 5, wherein predistortion module, when input voltage is not included in the storage content of predistortion function, is retrieved immediate input voltage the voltage using result for retrieval as predistortion.
7. according to the voltage controlled oscillator device described in claim 4 or 5, wherein predistortion module also comprises interpolation circuit, when input voltage is not included in the storage content of predistortion function, in the storage content of predistortion function, retrieve upper and lower neighbour's input voltage, and result for retrieval is carried out to interpolation as the voltage of predistortion.
8. voltage controlled oscillator device according to claim 1, wherein the range of linearity of voltage controlled oscillator device is larger than the range of linearity of voltage controlled oscillator.
9. voltage controlled oscillator device according to claim 1, wherein the linearity of voltage controlled oscillator device is higher than the linearity of voltage controlled oscillator.
10. a bearing calibration for voltage controlled oscillator, comprising:
The predistortion function of measuring voltage controlled oscillator, comprising:
For the set point of input voltage, calculate the calculated value of the frequency of oscillation of the output signal while meeting linear relationship, the set point of this input voltage is as input voltage;
To voltage controlled oscillator, apply input voltage;
Adjust input voltage, measure the actual oscillation frequency of the output signal of voltage controlled oscillator simultaneously; And
When the actual oscillation frequency of the output signal of voltage controlled oscillator equals the calculated value of frequency of oscillation of output signal, the voltage using the actual value of input voltage as predistortion;
In predistortion module, store predistortion function;
Utilize predistortion module to carry out pre-distortion to obtain the voltage of predistortion to input voltage;
The voltage of predistortion is offered to voltage controlled oscillator; And
Utilize voltage controlled oscillator according to the voltage of predistortion, to produce the output signal with corresponding frequency of oscillation,
Wherein, predistortion module is proofreaied and correct the nonlinear characteristic that exceeds the range of linearity of voltage controlled oscillator and the higher-order effect in the range of linearity, and making between input voltage and the frequency of oscillation of output signal is linear relationship.
11. methods according to claim 10, the wherein relation between predistortion function representation input voltage and the voltage of predistortion.
12. methods according to claim 10, wherein predistortion function is embodied as in the storage of memory the look-up table in internal memory perhaps.
13. methods according to claim 10, the predistortion function of wherein measuring voltage controlled oscillator is included in the interior uniform sampling of the range of linearity of design.
14. methods according to claim 10, the predistortion function of wherein measuring voltage controlled oscillator is included in the interior nonuniform sampling of the range of linearity of design, and the sampling density when input voltage approaches boundary value is higher than the sampling point density that approaches at 0 o'clock.
15. methods according to claim 10, wherein utilize predistortion module to carry out pre-distortion to input voltage and comprise and judge whether input voltage exceeds the range of linearity of design.
16. methods according to claim 10, wherein utilize predistortion module to carry out pre-distortion to input voltage and comprise the immediate input voltage of retrieval the voltage using result for retrieval as predistortion.
17. methods according to claim 10, wherein utilize predistortion module to carry out pre-distortion to input voltage and comprise the input voltage of retrieving upper and lower neighbour, and result for retrieval is carried out to interpolation as the voltage of predistortion.
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| JP6066015B1 (en) * | 2015-10-01 | 2017-01-25 | 三菱電機株式会社 | Linearity improvement processor |
| CN105553467B (en) * | 2015-12-08 | 2018-09-07 | 北京无线电计量测试研究所 | A kind of method of adjustment and equipment of stepped frequency signal |
| CN107005244B (en) * | 2017-02-08 | 2020-05-05 | 香港应用科技研究院有限公司 | Gain calibration of direct modulation synthesizer using look-up table search by decreasing count of overflow counter |
| CN108828539A (en) * | 2018-06-25 | 2018-11-16 | 中国电子科技集团公司第四十研究所 | A kind of VCO open loop linear correction method |
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| WO2007061658A1 (en) * | 2005-11-17 | 2007-05-31 | Cts Corporation | Coaxial resonator based voltage controlled oscillator/phased locked loop sythesizer module |
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