CN108649902B - Temperature compensation voltage-controlled oscillator and compensation method - Google Patents
Temperature compensation voltage-controlled oscillator and compensation method Download PDFInfo
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- CN108649902B CN108649902B CN201810457272.2A CN201810457272A CN108649902B CN 108649902 B CN108649902 B CN 108649902B CN 201810457272 A CN201810457272 A CN 201810457272A CN 108649902 B CN108649902 B CN 108649902B
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- 239000003990 capacitor Substances 0.000 claims description 27
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/02—Details
- H03B5/04—Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
- H03B5/1262—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising switched elements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B2201/00—Aspects of oscillators relating to varying the frequency of the oscillations
- H03B2201/02—Varying the frequency of the oscillations by electronic means
- H03B2201/0275—Varying the frequency of the oscillations by electronic means the means delivering several selected voltages or currents
- H03B2201/0283—Varying the frequency of the oscillations by electronic means the means delivering several selected voltages or currents the means functioning digitally
- H03B2201/0291—Varying the frequency of the oscillations by electronic means the means delivering several selected voltages or currents the means functioning digitally and being controlled by a processing device, e.g. a microprocessor
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- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
The invention discloses a temperature compensation voltage-controlled oscillator, which comprises an LC voltage-controlled oscillator, a digital temperature sensor, an off-chip microprocessor, a frequency digital calibration unit and an amplitude digital calibration unit; digital temperature sensor: the device is used for detecting the working environment temperature of the LC voltage-controlled oscillator in real time and transmitting the detected temperature signal to an off-chip microprocessor; an off-chip microprocessor: the frequency digital calibration unit is used for receiving and processing signals transmitted by the digital temperature sensor and transmitting the processed signals to the frequency digital calibration unit and the amplitude digital calibration unit; frequency digital calibration unit: the device is used for receiving signals transmitted by the off-chip microprocessor and performing frequency compensation action on the LC voltage-controlled oscillator according to the signals; amplitude digital calibration unit: the system is used for receiving signals transmitted by the off-chip microprocessor and performing amplitude compensation action on the LC voltage-controlled oscillator according to the signals. The invention realizes the frequency and amplitude calibration of the voltage-controlled oscillator by adopting a digital calibration method, has no problem of closed loop stability, and is stable and reliable.
Description
Technical Field
The invention relates to the field of oscillators, in particular to a temperature compensation voltage-controlled oscillator and a compensation method.
Background
The voltage-controlled oscillator is an oscillator in which the frequency and amplitude of an output signal are in a corresponding relation with the voltage of an input signal, and the working state of the oscillator or the element parameters of an oscillation circuit can be controlled by the input voltage to form a voltage-controlled oscillator. Since the frequency and amplitude of the output signal of the voltage-controlled oscillator can change along with the change of temperature, the performance of the system is seriously damaged, and the frequency and amplitude of the output signal of the voltage-controlled oscillator can be compensated by adopting a temperature compensation method.
However, the conventional temperature compensation scheme generally adopts a mode of simulating a closed loop, and the stability of the closed loop is not well controlled, so that the reliability of the whole circuit is greatly reduced, and the operation difficulty is increased due to the relative impurity degree of the structural design of the closed loop circuit.
Disclosure of Invention
In view of this, the present application provides a temperature compensation voltage-controlled oscillator and a compensation method, which realize the frequency and amplitude calibration of the voltage-controlled oscillator by adopting a digital calibration method, and have no problem of closed loop stability, and are stable and reliable. The invention is realized by the following technical scheme:
the temperature compensation voltage-controlled oscillator comprises an LC voltage-controlled oscillator, a digital temperature sensor, an off-chip microprocessor, a frequency digital calibration unit and an amplitude digital calibration unit;
digital temperature sensor: the device is used for detecting the working environment temperature of the LC voltage-controlled oscillator in real time and transmitting the detected temperature signal to an off-chip microprocessor;
an off-chip microprocessor: the temperature sensor is used for receiving and processing temperature signals transmitted by the digital temperature sensor, and transmitting the processed signals to the frequency digital calibration unit and the amplitude digital calibration unit;
frequency digital calibration unit: the LC voltage-controlled oscillator is used for receiving signals transmitted by the off-chip microprocessor and performing frequency compensation action on the LC voltage-controlled oscillator according to the signals;
amplitude digital calibration unit: and the device is used for receiving the signal transmitted by the off-chip microprocessor and performing amplitude compensation action on the LC voltage-controlled oscillator according to the signal.
Specifically, the circuit structure of the LC voltage controlled oscillator includes:
negative resistance tube: the negative resistance tube comprises a first MOS tube and a second MOS tube, wherein the grid electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, the grid electrode of the second MOS tube is connected with the drain electrode of the first MOS tube, and the source electrode of the first MOS tube is in short circuit with the source electrode of the second MOS tube;
LC resonator: the resonant cavity comprises a variable capacitor and an inductor which are connected in parallel, the variable capacitor comprises two first capacitors which are connected in series, two ends of the inductor are respectively connected with the drain electrode of the first MOS tube and the drain electrode of the second MOS tube, the inductor is provided with a tap which is used as a voltage input end of the temperature compensation voltage-controlled oscillator, two ends of the inductor are used as signal amplitude output ends of the temperature compensation voltage-controlled oscillator, and a common end of the two first capacitors in the variable capacitor is used as a signal frequency output end of the temperature compensation voltage-controlled oscillator;
reference current source: the reference current source comprises a third MOS tube and a fourth MOS tube, the source electrode of the third MOS tube is grounded after being connected with the source electrode of the fourth MOS tube, the grid electrode of the third MOS tube is connected with the grid electrode of the fourth MOS tube through a second switch, the drain electrode of the third MOS tube is connected with the source electrode of the first MOS tube, and the source electrode of the fourth MOS tube is used as the input end of the reference current source.
Further, the frequency digital calibration unit comprises m frequency digital calibration circuits connected in parallel, each frequency digital calibration circuit comprises one or more capacitors connected in series, a first switch is connected in series in each frequency digital calibration circuit, two ends of each frequency digital calibration circuit are connected with two ends of the inductor, and the first switch of each frequency digital calibration circuit is closed or opened according to signals received from an off-chip microprocessor.
Further, the frequency digital calibration unit comprises three frequency digital calibration circuits connected in parallel.
Further, the amplitude digital calibration unit comprises n amplitude digital calibration circuits connected in parallel, each amplitude digital calibration circuit comprises an MOS tube and a second switch, the drain electrode and the source electrode of the MOS tube of each amplitude digital calibration circuit are respectively connected with the drain electrode and the source electrode of the third MOS tube, and the grid electrode of the MOS tube of each amplitude digital calibration circuit is connected with the grid electrode of the fourth MOS tube through the second switch, wherein the second switch of each amplitude digital calibration circuit is closed or opened according to signals received from an off-chip microprocessor.
Further, the amplitude digital calibration unit comprises three amplitude digital calibration circuits connected in parallel.
A compensation method for a temperature compensated voltage controlled oscillator, the compensation method for providing temperature compensation for the temperature compensated voltage controlled oscillator, comprising:
the reference amplitude and the reference frequency of the output signal of the LC voltage-controlled oscillator under different control voltages are calculated respectively through a formula (I) and a formula (II),
wherein A is the reference amplitude, I tail The tail current value of the LC voltage-controlled oscillator, omega is the frequency of the LC voltage-controlled oscillator, L is the inductance value of the LC voltage-controlled oscillator, f is the reference frequency, and C is the capacitance value of the LC voltage-controlled oscillator;
starting an LC voltage-controlled oscillator without temperature compensation;
under each control voltage, measuring and recording the working amplitude and the working frequency corresponding to the output signals when the LC voltage-controlled oscillator works at different temperature values;
calculating to obtain frequency compensation codes and amplitude compensation codes corresponding to the LC voltage-controlled oscillator working at different temperature values under each control voltage, and implanting the frequency compensation codes and the amplitude compensation codes corresponding to the LC voltage-controlled oscillator working at different temperature values under different control voltages into an off-chip microprocessor;
starting an LC voltage-controlled oscillator with temperature compensation;
according to the temperature value detected by the digital temperature sensor and the control voltage of the LC voltage-controlled oscillator, the off-chip microprocessor performs frequency compensation and amplitude compensation on the LC voltage-controlled oscillator through the frequency digital calibration unit and the amplitude digital calibration unit according to the frequency compensation code and the amplitude compensation code which are implanted in advance.
Further, the calculating to obtain the frequency compensation code and the amplitude compensation code corresponding to each LC voltage-controlled oscillator working at different temperature values under each control voltage specifically includes:
under the first control voltage, comparing the reference frequency of the output signal of the LC voltage-controlled oscillator with the corresponding working frequency of the output signal when the LC voltage-controlled oscillator works at different temperature values, calculating the frequency deviation amount, and obtaining the corresponding frequency compensation code when the LC voltage-controlled oscillator works at different temperature values under the first control voltage according to the frequency deviation amount;
under the first control voltage, comparing the reference amplitude of the output signal of the LC voltage-controlled oscillator with the corresponding working amplitude of the output signal when the LC voltage-controlled oscillator works at different temperature values, calculating the amplitude deviation value, and obtaining the corresponding amplitude compensation code when the LC voltage-controlled oscillator works at different temperature values under the first control voltage according to the amplitude deviation value;
under the second control voltage, comparing the reference frequency of the output signal of the LC voltage-controlled oscillator with the corresponding working frequency of the output signal when the LC voltage-controlled oscillator works at different temperature values, calculating the frequency deviation amount, and obtaining the corresponding frequency compensation code when the LC voltage-controlled oscillator works at different temperature values under the second control voltage according to the frequency deviation amount;
under the second control voltage, comparing the reference amplitude of the output signal of the LC voltage-controlled oscillator with the corresponding working amplitude of the output signal when the LC voltage-controlled oscillator works at different temperature values, calculating the amplitude deviation value, and obtaining the corresponding amplitude compensation code when the LC voltage-controlled oscillator works at different temperature values under the second control voltage according to the amplitude deviation value;
and the like, until the corresponding frequency compensation code and amplitude compensation code are obtained when the LC voltage-controlled oscillator works at different temperature values under each control voltage.
Further, the frequency digital calibration unit comprises m frequency digital calibration circuits and m first switches which are connected in parallel, wherein each frequency digital calibration circuit is connected with one first switch in series, the first switch connected with the j-th frequency digital calibration circuit in series is Dj, m is more than or equal to 2, and m is more than or equal to j is more than or equal to 1;
the frequency compensation code is used to control the opening and closing of the m first switches D1, D2.
Further, the amplitude digital calibration unit comprises n amplitude digital calibration circuits and n second switches which are connected in parallel, wherein each amplitude digital calibration circuit is respectively connected with one second switch in series, the second switch connected with the ith amplitude digital calibration circuit in series is Bi, n is more than or equal to 2, and n is more than or equal to i is more than or equal to 1;
the amplitude compensation code is used to control the opening and closing of n second switches B1, B2.
The invention realizes the frequency and amplitude calibration of the voltage-controlled oscillator by a digital calibration method, has no problem of closed loop stability, is stable and reliable, and particularly, when the LC voltage-controlled oscillator works, the digital temperature sensor transmits the detected working temperature value of the LC voltage-controlled oscillator to the off-chip microprocessor, and the off-chip microprocessor carries out corresponding frequency compensation and temperature compensation on the LC voltage-controlled oscillator through the frequency digital calibration unit and the amplitude digital calibration unit respectively according to the pre-implanted frequency compensation code and the amplitude compensation code, thereby having good stability, high compensation speed and high reliability.
Drawings
Fig. 1 is a schematic diagram of a temperature compensated vco provided in embodiment 1.
Reference numerals: the device comprises an L-inductor, a C1-first capacitor, a M1-first MOS tube, a M2-second MOS tube, a M3-third MOS tube, a M4-fourth MOS tube, a D1-first switch in a first frequency digital calibration circuit, a D2-second switch in a second frequency digital calibration circuit, a Dm-M-th first switch in a frequency digital calibration circuit, a B1-first second switch in a first amplitude digital calibration circuit, a B2-second switch in a second amplitude digital calibration circuit, a Bn-n-th second switch in a second amplitude digital calibration circuit, and a B0-third MOS tube and a fourth MOS tube which are connected in series.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Example 1
As shown in fig. 1, the present embodiment provides a temperature compensated voltage controlled oscillator, which includes an LC voltage controlled oscillator, and further includes a digital temperature sensor, an off-chip microprocessor, a frequency digital calibration unit, and an amplitude digital calibration unit;
digital temperature sensor: the device is used for detecting the working environment temperature of the LC voltage-controlled oscillator in real time and transmitting the detected temperature signal to an off-chip microprocessor;
an off-chip microprocessor: the temperature sensor is used for receiving and processing temperature signals transmitted by the digital temperature sensor, and transmitting the processed signals to the frequency digital calibration unit and the amplitude digital calibration unit;
frequency digital calibration unit: the device is used for receiving signals transmitted by the off-chip microprocessor and performing frequency compensation action on the LC voltage-controlled oscillator according to the signals;
amplitude digital calibration unit: the system is used for receiving signals transmitted by the off-chip microprocessor and performing amplitude compensation action on the LC voltage-controlled oscillator according to the signals.
Specifically, the circuit structure of the LC voltage controlled oscillator includes:
negative resistance tube: the negative resistance tube comprises a first MOS tube M1 and a second MOS tube M2, wherein the grid electrode of the first MOS tube M1 is connected with the drain electrode of the second MOS tube M2, the grid electrode of the second MOS tube M2 is connected with the drain electrode of the first MOS tube M1, and the source electrode of the first MOS tube M1 is in short circuit with the source electrode of the second MOS tube M2;
LC resonator: the resonant cavity comprises a variable capacitor and an inductor L which are connected in parallel, the variable capacitor comprises two first capacitors C1 which are connected in series, two ends of the inductor L are respectively connected with a drain electrode of the first MOS tube M1 and a drain electrode of the second MOS tube M2, the inductor L is provided with a tap, the tap is used as a voltage input end of the temperature compensation voltage-controlled oscillator, two ends of the inductor L are used as signal amplitude output ends of the temperature compensation voltage-controlled oscillator, and a common end of the two first capacitors C1 in the variable capacitor is used as a signal frequency output end of the temperature compensation voltage-controlled oscillator; it should be noted that, the first capacitors C1 are variable capacitors, and in the variable capacitors, besides two first capacitors C1 connected in series, each first capacitor C1 is connected with another other end of the other first capacitor C1 in opposite directions, and the number of capacitors connected in series in each first capacitor C1 is equal, and the capacitance values are the same.
Reference current source: the reference current source comprises a third MOS tube M3 and a fourth MOS tube M4, wherein the source electrode of the third MOS tube M3 is connected with the source electrode of the fourth MOS tube M4 and then grounded, the grid electrode of the third MOS tube M3 is connected with the grid electrode of the fourth MOS tube M4 through a second switch, the drain electrode of the third MOS tube M3 is connected with the source electrode of the first MOS tube M1, and the source electrode of the fourth MOS tube M4 is used as a current input end of the reference current source.
Specifically, the frequency digital calibration unit comprises m frequency digital calibration circuits connected in parallel, each frequency digital calibration circuit comprises one or more capacitors connected in series, a first switch is connected in series in each frequency digital calibration circuit, two ends of each frequency digital calibration circuit are connected with two ends of the inductor L, and a second switch of each frequency digital calibration circuit is closed or opened according to signals received from an off-chip microprocessor. It should be noted that, the frequency digital calibration unit includes m parallel frequency digital calibration circuits and m first switches in total, each frequency digital calibration circuit is connected in series with one first switch, for distinguishing and facilitating encoding of an off-chip non-processor, the m first switches are denoted as D1, D2, and Dm, respectively, i.e., the first switch connected in series with the first frequency digital calibration circuit is denoted as D1, the second switch connected in series with the second frequency digital calibration circuit is denoted as D2, and so on, the first switch connected in series with the mth frequency digital calibration circuit is denoted as Dm.
Preferably, the frequency digital calibration unit comprises three frequency digital calibration circuits connected in parallel.
Specifically, the amplitude digital calibration unit comprises n amplitude digital calibration circuits connected in parallel, each amplitude digital calibration circuit comprises an MOS tube and a second switch, the drain electrode and the source electrode of the MOS tube of each amplitude digital calibration circuit are respectively connected with the drain electrode and the source electrode of the third MOS tube M3, and the grid electrode of the MOS tube of each amplitude digital calibration circuit is connected with the grid electrode of the fourth MOS tube M4 through the second switch, wherein the second switch of each amplitude digital calibration circuit is closed or opened according to signals received from an off-chip microprocessor. It should be noted here that the amplitude digital calibration unit includes n parallel amplitude digital calibration circuits and n second switches, each of the amplitude digital calibration circuits is connected in series with one second switch, and for distinguishing and facilitating encoding of an off-chip non-processor, the n second switches are denoted as B1, B2, bm, respectively, i.e., the second switch of the first series of amplitude digital calibration circuits is denoted as B1, the second switch of the second series of amplitude digital calibration circuits is denoted as B2, and so on, the second switch of the nth series of frequency digital calibration circuits is denoted as Bm, and in addition, the second switch between the third MOS transistor M3 and the fourth MOS transistor M4 is denoted as B0.
Preferably, the amplitude digital calibration unit comprises three amplitude digital calibration circuits connected in parallel.
Example 2
The present embodiment provides a compensation method for a temperature compensated voltage controlled oscillator, the compensation method being used for providing temperature compensation for the temperature compensated voltage controlled oscillator provided in embodiment 1, including:
step S1: the reference amplitude and the reference frequency of the output signal of the LC voltage-controlled oscillator under different control voltages are calculated respectively through a formula (I) and a formula (II),
wherein A is the reference amplitude, I tail The tail current value of the LC voltage-controlled oscillator, omega is the frequency of the LC voltage-controlled oscillator, L is the inductance value of the LC voltage-controlled oscillator, f is the reference frequency, and C is the capacitance value of the LC voltage-controlled oscillator;
step S2: starting an LC voltage-controlled oscillator without temperature compensation;
step S3: under each control voltage, measuring and recording the working amplitude and the working frequency corresponding to the output signals when the LC voltage-controlled oscillator works at different temperature values;
step S4: calculating to obtain frequency compensation codes and amplitude compensation codes corresponding to the LC voltage-controlled oscillator working at different temperature values under each control voltage, and implanting the frequency compensation codes and the amplitude compensation codes corresponding to the LC voltage-controlled oscillator working at different temperature values under different control voltages into an off-chip microprocessor;
step S4: starting an LC voltage-controlled oscillator with temperature compensation;
step S5: according to the temperature value detected by the digital temperature sensor and the control voltage of the LC voltage-controlled oscillator, the off-chip microprocessor performs frequency compensation and amplitude compensation on the LC voltage-controlled oscillator through the frequency digital calibration unit and the amplitude digital calibration unit according to the frequency compensation code and the amplitude compensation code which are implanted in advance.
It should be noted that, for two or more temperature compensated voltage controlled oscillators with the same equipment parameters, the frequency compensation code and the amplitude compensation code in the compensation method provided in this embodiment need to be calculated only once, and the frequency compensation code and the amplitude compensation code obtained finally are respectively implanted into the off-chip microprocessor of each temperature compensated voltage controlled oscillator.
Specifically, the calculating in step S4 to obtain the frequency compensation code and the amplitude compensation code corresponding to each LC vco operating at different temperature values under each control voltage specifically includes:
under the first control voltage, comparing the reference frequency of the output signal of the LC voltage-controlled oscillator with the corresponding working frequency of the output signal when the LC voltage-controlled oscillator works at different temperature values, calculating the frequency deviation amount, and obtaining the corresponding frequency compensation code when the LC voltage-controlled oscillator works at different temperature values under the first control voltage according to the frequency deviation amount;
under the first control voltage, comparing the reference amplitude of the output signal of the LC voltage-controlled oscillator with the corresponding working amplitude of the output signal when the LC voltage-controlled oscillator works at different temperature values, calculating the amplitude deviation value, and obtaining the corresponding amplitude compensation code when the LC voltage-controlled oscillator works at different temperature values under the first control voltage according to the amplitude deviation value;
under the second control voltage, comparing the reference frequency of the output signal of the LC voltage-controlled oscillator with the corresponding working frequency of the output signal when the LC voltage-controlled oscillator works at different temperature values, calculating the frequency deviation amount, and obtaining the corresponding frequency compensation code when the LC voltage-controlled oscillator works at different temperature values under the second control voltage according to the frequency deviation amount;
under the second control voltage, comparing the reference amplitude of the output signal of the LC voltage-controlled oscillator with the corresponding working amplitude of the output signal when the LC voltage-controlled oscillator works at different temperature values, calculating the amplitude deviation value, and obtaining the corresponding amplitude compensation code when the LC voltage-controlled oscillator works at different temperature values under the second control voltage according to the amplitude deviation value;
and the like, until the corresponding frequency compensation code and amplitude compensation code are obtained when the LC voltage-controlled oscillator works at different temperature values under each control voltage.
In particular, when the control voltage is fixed, the deviation amounts of the working frequency and the reference frequency of the LC voltage-controlled oscillator under different temperature values are obtained by comparing, so as to obtain the frequency compensation amounts corresponding to the LC voltage-controlled oscillator under a series of different temperature values respectively under the control voltage, according to a certain frequency compensation amount (corresponding to one control voltage and one temperature value), the opening and closing relations corresponding to m first switches can be obtained, so as to obtain the frequency compensation code, and similarly, the deviation amounts of the working amplitude and the reference amplitude of the LC voltage-controlled oscillator under different temperature values are obtained by comparing, so as to obtain the amplitude compensation amounts corresponding to the LC voltage-controlled oscillator under a series of different temperature values respectively under the control voltage, and according to a certain amplitude compensation amount (corresponding to one control voltage and one temperature value), the opening and closing relations corresponding to n second switches can be obtained, so as to obtain the amplitude compensation code.
Specifically, the frequency digital calibration unit comprises m frequency digital calibration circuits and m first switches which are connected in parallel, wherein each frequency digital calibration circuit is connected with one first switch in series, the first switch connected with the j-th frequency digital calibration circuit in series is Dj, m is more than or equal to 2, and m is more than or equal to j is more than or equal to 1;
the frequency compensation code is used to control the opening and closing of the m first switches D1, D2.
Specifically, the amplitude digital calibration unit comprises n amplitude digital calibration circuits and n second switches which are connected in parallel, wherein each amplitude digital calibration circuit is respectively connected with one second switch in series, the second switch connected with the ith amplitude digital calibration circuit in series is Bi, n is more than or equal to 2, and n is more than or equal to i is more than or equal to 1;
the amplitude compensation code is used to control the opening and closing of n second switches B1, B2.
When the embodiment is implemented, an LC voltage-controlled oscillator generates an output signal, the working frequency and the voltage swing of the LC voltage-controlled oscillator change along with the temperature, the values of the LC voltage-controlled oscillator and the reference value are recorded, the relation between the output frequency and the temperature swing is obtained, the temperature sensor provides temperature information of an off-chip microcontroller in real time, the off-chip microcontroller calculates the difference between the current frequency and the reference value and generates corresponding digital control codes according to the current temperature, and the digital control codes are respectively provided for a frequency digital calibration unit and an amplitude digital calibration unit to realize the temperature compensation of the frequency and the amplitude.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that the above-mentioned preferred embodiment should not be construed as limiting the invention, and the scope of the invention should be defined by the appended claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (6)
1. The temperature compensation voltage-controlled oscillator comprises an LC voltage-controlled oscillator and is characterized by further comprising a digital temperature sensor, an off-chip microprocessor, a frequency digital calibration unit and an amplitude digital calibration unit; digital temperature sensor: the device is used for detecting the working environment temperature of the LC voltage-controlled oscillator in real time and transmitting the detected temperature signal to an off-chip microprocessor; an off-chip microprocessor: the temperature sensor is used for receiving and processing temperature signals transmitted by the digital temperature sensor, and transmitting the processed signals to the frequency digital calibration unit and the amplitude digital calibration unit; frequency digital calibration unit: the LC voltage-controlled oscillator is used for receiving signals transmitted by the off-chip microprocessor and performing frequency compensation action on the LC voltage-controlled oscillator according to the signals; amplitude digital calibration unit: the LC voltage-controlled oscillator is used for receiving signals transmitted by the off-chip microprocessor and performing amplitude compensation action on the LC voltage-controlled oscillator according to the signals; the off-chip microprocessor is internally implanted with frequency compensation codes and amplitude compensation codes corresponding to the LC voltage-controlled oscillator working at different temperature values under different control voltages, and after receiving the temperature signals transmitted by the digital temperature sensor, the off-chip microprocessor inquires the frequency compensation codes and the amplitude compensation codes corresponding to the temperature and transmits corresponding control signals to the frequency digital calibration unit and the amplitude digital calibration unit;
the circuit structure of the LC voltage-controlled oscillator comprises: negative resistance tube: the negative resistance tube comprises a first MOS tube M1 and a second MOS tube M2, wherein the grid electrode of the first MOS tube M1 is connected with the drain electrode of the second MOS tube M2, the grid electrode of the second MOS tube M2 is connected with the drain electrode of the first MOS tube M1, and the source electrode of the first MOS tube M1 is in short circuit with the source electrode of the second MOS tube M2; LC resonator: the resonant cavity comprises a variable capacitor and an inductor L which are connected in parallel, the variable capacitor comprises two first capacitors C1 which are connected in series, two ends of the inductor L are respectively connected with a drain electrode of the first MOS tube M1 and a drain electrode of the second MOS tube M2, the inductor L is provided with a tap, the tap is used as a voltage input end of the temperature compensation voltage-controlled oscillator, two ends of the inductor L are used as signal amplitude output ends of the temperature compensation voltage-controlled oscillator, and a common end of the two first capacitors C1 in the variable capacitor is used as a signal frequency output end of the temperature compensation voltage-controlled oscillator; reference current source: the reference current source comprises a third MOS tube M3 and a fourth MOS tube M4, wherein the source electrode of the third MOS tube M3 is connected with the source electrode of the fourth MOS tube M4 and then grounded, the grid electrode of the third MOS tube M3 is connected with the grid electrode of the fourth MOS tube M4 through a second switch, the drain electrode of the third MOS tube M3 is connected with the source electrode of the first MOS tube M1, and the source electrode of the fourth MOS tube M4 is used as a current input end of the reference current source;
the frequency digital calibration unit comprises m frequency digital calibration circuits connected in parallel, each frequency digital calibration circuit comprises one or more capacitors connected in series, a first switch is connected in series in each frequency digital calibration circuit, two ends of each frequency digital calibration circuit are connected with two ends of the inductor L, and a second switch of each frequency digital calibration circuit is closed or opened according to signals received from an off-chip microprocessor;
the amplitude digital calibration unit comprises n amplitude digital calibration circuits which are connected in parallel, each amplitude digital calibration circuit comprises an MOS tube and a second switch, the drain electrode and the source electrode of the MOS tube of each amplitude digital calibration circuit are respectively connected with the drain electrode and the source electrode of the third MOS tube M3, and the grid electrode of the MOS tube of each amplitude digital calibration circuit is connected with the grid electrode of the fourth MOS tube M4 through the second switch, wherein the second switch of each amplitude digital calibration circuit is closed or opened according to signals received from an off-chip microprocessor.
2. A temperature compensated voltage controlled oscillator according to claim 1, wherein the frequency digital calibration unit comprises three frequency digital calibration circuits connected in parallel.
3. A temperature compensated voltage controlled oscillator as claimed in claim 2, wherein the amplitude digital calibration unit comprises three amplitude digital calibration circuits connected in parallel.
4. A compensation method for a temperature compensated voltage controlled oscillator, the compensation method for providing temperature compensation for the temperature compensated voltage controlled oscillator of claim 1, comprising: the reference amplitude and the reference frequency of the output signal of the LC voltage-controlled oscillator under different control voltages are calculated respectively through a formula I and a formula II,
wherein A is a reference amplitude, iail is a tail current value of the LC voltage-controlled oscillator, ω is a frequency of the LC voltage-controlled oscillator, L is an inductance value of the LC voltage-controlled oscillator, R is a resistance value of the LC voltage-controlled oscillator, f is a reference frequency, and C is a capacitance value of the LC voltage-controlled oscillator; starting an LC voltage-controlled oscillator without temperature compensation; under each control voltage, measuring and recording the working amplitude and the working frequency corresponding to the output signals when the LC voltage-controlled oscillator works at different temperature values; calculating to obtain frequency compensation codes and amplitude compensation codes corresponding to the LC voltage-controlled oscillator working at different temperature values under each control voltage, and implanting the frequency compensation codes and the amplitude compensation codes corresponding to the LC voltage-controlled oscillator working at different temperature values under different control voltages into an off-chip microprocessor; starting an LC voltage-controlled oscillator with temperature compensation; according to the temperature value detected by the digital temperature sensor and the control voltage of the LC voltage-controlled oscillator, the off-chip microprocessor respectively performs frequency compensation and amplitude compensation on the LC voltage-controlled oscillator through a frequency digital calibration unit and an amplitude digital calibration unit according to a frequency compensation code and an amplitude compensation code which are implanted in advance; wherein,
the frequency compensation code and the amplitude compensation code corresponding to each LC voltage-controlled oscillator working at different temperature values under each control voltage obtained by calculation specifically comprise: under the first control voltage, comparing the reference frequency of the output signal of the LC voltage-controlled oscillator with the corresponding working frequency of the output signal when the LC voltage-controlled oscillator works at different temperature values, calculating the frequency deviation amount, and obtaining the corresponding frequency compensation code when the LC voltage-controlled oscillator works at different temperature values under the first control voltage according to the frequency deviation amount; under the first control voltage, comparing the reference amplitude of the output signal of the LC voltage-controlled oscillator with the corresponding working amplitude of the output signal when the LC voltage-controlled oscillator works at different temperature values, calculating the amplitude deviation value, and obtaining the corresponding amplitude compensation code when the LC voltage-controlled oscillator works at different temperature values under the first control voltage according to the amplitude deviation value; under the second control voltage, comparing the reference frequency of the output signal of the LC voltage-controlled oscillator with the corresponding working frequency of the output signal when the LC voltage-controlled oscillator works at different temperature values, calculating the frequency deviation amount, and obtaining the corresponding frequency compensation code when the LC voltage-controlled oscillator works at different temperature values under the second control voltage according to the frequency deviation amount; under the second control voltage, comparing the reference amplitude of the output signal of the LC voltage-controlled oscillator with the corresponding working amplitude of the output signal when the LC voltage-controlled oscillator works at different temperature values, calculating the amplitude deviation value, and obtaining the corresponding amplitude compensation code when the LC voltage-controlled oscillator works at different temperature values under the second control voltage according to the amplitude deviation value; and the like, until the corresponding frequency compensation code and amplitude compensation code are obtained when the LC voltage-controlled oscillator works at different temperature values under each control voltage.
5. The method of claim 4, wherein the frequency digital calibration unit comprises m frequency digital calibration circuits and m first switches connected in parallel, wherein each frequency digital calibration circuit is respectively connected with one first switch in series, the first switch connected with the j-th frequency digital calibration circuit in series is Dj, m is greater than or equal to 2, and m is greater than or equal to j is greater than or equal to 1; the frequency compensation code is used to control the opening and closing of the m first switches D1, D2.
6. The method for compensating a temperature compensated voltage controlled oscillator according to claim 4, wherein the amplitude digital calibration unit comprises n amplitude digital calibration circuits and n second switches connected in parallel, wherein each of the amplitude digital calibration circuits is connected in series with one of the second switches, the second switch connected in series with the ith amplitude digital calibration circuit is Bi, n is greater than or equal to 2, and n is greater than or equal to i is greater than or equal to 1; the amplitude compensation code is used to control the opening and closing of n second switches B1, B2.
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| CN111181489B (en) * | 2020-01-21 | 2024-02-20 | 广州全盛威信息技术有限公司 | Voltage-controlled oscillator and temperature drift compensation method |
| CN111917422B (en) * | 2020-08-14 | 2022-04-12 | 浙江三维通信科技有限公司 | Control method and circuit of radio frequency voltage controlled oscillator |
| CN113824442B (en) * | 2021-09-26 | 2024-02-13 | 合肥甘尧电子科技有限公司 | Chip oscillator temperature compensation control system |
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