CN217546022U - Voltage presetting device for digital phase-locked loop, frequency synthesizer and electronic communication device - Google Patents
Voltage presetting device for digital phase-locked loop, frequency synthesizer and electronic communication device Download PDFInfo
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- CN217546022U CN217546022U CN202220195328.3U CN202220195328U CN217546022U CN 217546022 U CN217546022 U CN 217546022U CN 202220195328 U CN202220195328 U CN 202220195328U CN 217546022 U CN217546022 U CN 217546022U
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Abstract
The utility model discloses a voltage presetting device of digital phase-locked loop mainly relates to digital phase-locked frequency synthesis technical field. The device comprises an analog-to-digital converter, a controller, a digital-to-analog converter, a crystal oscillator and an adder; the analog-to-digital converter is connected with the digital phase-locked loop and used for converting the analog quantity of the initial locking voltage of the digital phase-locked loop into digital quantity; the controller is connected with the analog-to-digital converter and used for sending the digital quantity of the initial locking voltage to the digital-to-analog converter so as to be converted into the analog quantity of the initial locking voltage by the digital-to-analog converter; the crystal oscillator is connected with the digital phase-locked loop; the adder is connected with the digital-to-analog converter and used for adding the error voltage and the analog quantity of the converted initial locking voltage to obtain a preset voltage. The utility model discloses an analog-to-digital conversion mode acquires initial locking voltage, and the initial locking voltage precision that records is higher, and the precision based on the preset voltage that initial locking voltage obtained is higher, can effectively reduce the frequency difference, improves the frequency hopping time.
Description
Technical Field
The utility model relates to a digital phase-locked frequency synthesis technical field especially relates to a voltage of digital phase-locked loop presets device, digital phase-locked frequency synthesizer and electronic communication device.
Background
With the rapid development of communication technology and radar technology, higher requirements are put on the performance of an electronic system, and the digital phase-locked frequency synthesizer as the heart of the electronic system is particularly critical, wherein the frequency hopping time is one of the key technical indexes. Especially in military electronic systems, due to the requirement of electronic systems to meet the demand, the synthesized frequency source is required to be able to fast frequency hop in a wide frequency band, i.e. the frequency hopping time is required to be shorter and shorter, wherein reducing the frequency difference is an effective method for improving the frequency hopping time of the digital phase-locked frequency synthesizer.
The frequency hopping method comprises the steps that the frequency hopping time is improved through a voltage-controlled oscillator superposed voltage method, the voltage corresponding to the recorded frequency of a tuning end of a voltage-controlled oscillator is adjusted to serve as initial locking voltage, and the frequency difference is adjusted through adjusting the initial locking voltage.
Therefore, how to improve the frequency hopping time is an urgent problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a voltage of digital phase-locked loop presets device, digital phase-locked frequency synthesizer and electronic communication device for reduce digital phase-locked loop's frequency difference, improve frequency hopping time.
In order to solve the technical problem, the utility model provides a voltage preset device of digital phase-locked loop, include: the system comprises an analog-to-digital converter 1, a controller 2, a digital-to-analog converter 3, a crystal oscillator 4 and an adder 5;
the analog-to-digital converter 1 is connected with the digital phase-locked loop 6 and is used for converting the analog quantity of the initial locking voltage of the digital phase-locked loop 6 into the digital quantity of the initial locking voltage;
the controller 2 is connected with the analog-to-digital converter 1 and is used for sending the digital quantity of the initial locking voltage converted by the analog-to-digital converter 1 to the digital-to-analog converter 3 so that the digital-to-analog converter 3 can convert the digital quantity of the initial locking voltage sent by the controller 2 into the analog quantity of the initial locking voltage;
the crystal oscillator 4 is connected with the digital phase-locked loop 6 and used for providing reference frequency for the digital phase-locked loop 6;
the adder 5 is connected to the digital-to-analog converter 3, and is configured to add an error voltage generated by the digital phase-locked loop 6 according to a comparison result between the extracted frequency of the output signal and the reference frequency and an analog quantity of the converted initial locking voltage to obtain a preset voltage, so as to tune the digital phase-locked loop 6 with the preset voltage.
Preferably, the crystal oscillator 4 is an oven controlled crystal oscillator.
Preferably, the analog-to-digital converter 1, the controller 2 and the digital-to-analog converter 3 are packaged.
Solve the technical problem, the utility model also provides a digital phase-locked frequency synthesizer, including the preset device of voltage of above-mentioned digital phase-locked loop.
Preferably, the digital phase-locked loop further comprises a digital phase-locked loop 6 connected with the voltage presetting device of the digital phase-locked loop;
the digital phase-locked loop 6 comprises a voltage-controlled oscillator 7, a coupler 8, a phase frequency detector 9 and a loop filter 10;
the voltage-controlled oscillator 7 is connected with the adder 5, and the voltage-controlled oscillator 7 is connected with the analog-to-digital converter 1 and used for providing analog quantity of initial locking voltage for the analog-to-digital converter 1;
the coupler 8 is connected with the voltage-controlled oscillator 7 and is used for extracting an output signal of the voltage-controlled oscillator 7;
the phase frequency detector 9 is connected with the coupler 8 and the crystal oscillator 4 and used for comparing the frequency of the output signal extracted by the coupler 8 with the reference frequency provided by the crystal oscillator 4 and generating error voltage according to the comparison result;
the loop filter 10 is connected with the phase frequency detector 9, the loop filter 10 is connected with the adder 5, and the loop filter is used for filtering error voltage generated by the phase frequency detector 9 and sending the filtered error voltage to the adder 5.
Preferably, a frequency divider 11 is further included, connected to the coupler 8 and the phase frequency detector 9, for calibrating the frequency of the output signal provided by the coupler 8 and sending the calibrated frequency of the output signal to the phase frequency detector 9.
To solve the above technical problem, the present invention further provides an electronic communication device, including the digital phase-locked frequency synthesizer.
Preferably, the digital phase-locked frequency synthesizer also comprises a display screen connected with the digital phase-locked frequency synthesizer.
The utility model provides a voltage presetting device of a digital phase-locked loop, which comprises an analog-digital converter, a controller, a digital-analog converter, a crystal oscillator and an adder; the analog-to-digital converter is connected with the digital phase-locked loop and is used for converting the analog quantity of the initial locking voltage of the digital phase-locked loop into the digital quantity of the initial locking voltage; the controller is connected with the analog-to-digital converter and used for sending the digital quantity of the initial locking voltage converted by the analog-to-digital converter to the digital-to-analog converter so that the digital-to-analog converter can convert the digital quantity of the initial locking voltage sent by the controller into the analog quantity of the initial locking voltage; the crystal oscillator is connected with the digital phase-locked loop and used for providing reference frequency for the digital phase-locked loop; the adder is connected with the digital-to-analog converter and used for adding an error voltage generated by the digital phase-locked loop according to the comparison result of the extracted frequency of the output signal and the reference frequency and the analog quantity of the converted initial locking voltage to obtain a preset voltage so as to tune the digital phase-locked loop through the preset voltage. The utility model discloses an initial locking voltage is obtained to the analog-to-digital conversion mode, compares in traditional method of roughly surveying initial locking voltage, and the initial locking voltage precision of surveying is higher, and consequently, the precision of the preset voltage based on initial locking voltage obtains is higher, can effectively reduce the frequency difference of digital phase-locked loop through this preset voltage regulation voltage controlled oscillator, improves frequency hopping time.
Additionally, the utility model provides a digital phase-locked loop frequency synthesizer, the voltage that includes the above-mentioned digital phase-locked loop presets the device, and the effect is the same as above.
Furthermore, the utility model also provides an electronic communication device, including digital phase-locked frequency synthesizer, the effect is the same as above.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious to those skilled in the art that other drawings can be obtained based on these drawings without inventive work.
Fig. 1 is a structural diagram of a voltage presetting device of a digital phase-locked loop provided by the present invention;
fig. 2 is a structural diagram of a digital phase-locked frequency synthesizer according to the present invention.
The reference numbers are as follows: the digital-to-analog converter (ADC) 1, the controller 2, the digital-to-analog converter 3, the crystal oscillator 4, the adder 5, the digital phase-locked loop 6, the voltage-controlled oscillator 7, the coupler 8, the phase frequency detector 9, the loop filter 10 and the frequency divider 11.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiment in the utility model, under the prerequisite that does not make creative work, all other embodiments that obtained of ordinary skilled person in the art all belong to the utility model discloses protection scope.
The core of the utility model is to provide a voltage preset device, digital phase-locked frequency synthesizer and the electronic communication device of digital phase-locked loop for reduce digital phase-locked loop's frequency difference, improve digital phase-locked frequency synthesizer's frequency hopping time.
In order to make the technical field better understand the solution of the present invention, the following detailed description is given with reference to the accompanying drawings and the detailed description.
It should be noted that the present invention provides a voltage presetting device for digital phase-locked loop, which is suitable for various electronic communication systems, and can be used for electronic countermeasure of military electronic communication systems, and also can be used for electronic communication of commercial electronic communication systems, and is not limited herein.
Fig. 1 is a structural diagram of a voltage presetting device of a digital phase-locked loop according to the present invention, and the structure shown in fig. 1 is explained below.
A voltage preset device for a digital phase locked loop, comprising: the system comprises an analog-to-digital converter 1, a controller 2, a digital-to-analog converter 3, a crystal oscillator 4 and an adder 5; the analog-to-digital converter 1 is connected with the digital phase-locked loop 6 and is used for converting the analog quantity of the initial locking voltage of the digital phase-locked loop 6 into the digital quantity of the initial locking voltage; the controller 2 is connected with the analog-to-digital converter 1 and is used for sending the digital quantity of the initial locking voltage converted by the analog-to-digital converter 1 to the digital-to-analog converter 3 so that the digital-to-analog converter 3 can convert the digital quantity of the initial locking voltage sent by the controller 2 into the analog quantity of the initial locking voltage; the crystal oscillator 4 is connected with the digital phase-locked loop 6 and used for providing reference frequency for the digital phase-locked loop 6; the adder 5 is connected to the digital-to-analog converter 3, and is configured to add an error voltage generated by the digital phase-locked loop 6 according to a comparison result between the extracted frequency of the output signal and the reference frequency and an analog quantity of the converted initial locking voltage to obtain a preset voltage, so as to tune the digital phase-locked loop 6 with the preset voltage.
In this embodiment, the controller 2 may be a combinational logic controller or a micro-program controller, and the type of the controller 2 is not limited in this embodiment. In addition, the crystal oscillator 4 may be an oven controlled crystal oscillator or a temperature compensated crystal oscillator, and the present embodiment does not limit the kind of the crystal oscillator 4.
Fig. 2 is a structural diagram of a digital phase-locked frequency synthesizer according to the present invention. Typically, the digital phase locked loop 6 comprises a voltage controlled oscillator 7, a phase frequency detector 9 and a loop filter 10, as shown in fig. 2. In a specific implementation, however, the digital phase locked loop 6 includes, but is not limited to, a voltage controlled oscillator 7, a phase frequency detector 9, and a loop filter 10, and may further include a coupler, an operational amplifier, and the like. Specifically, the analog-to-digital converter 1 collects an initial locking voltage of the voltage-controlled oscillator 7, converts an analog quantity of the initial locking voltage into a digital quantity of the initial locking voltage, the controller 2 is used for realizing communication between the analog-to-digital converter 1 and the digital-to-analog converter 3, sends the digital quantity of the initial locking voltage converted by the analog-to-digital converter 1 to the digital-to-analog converter 3, controls the digital-to-analog converter 3 to convert the received digital quantity of the initial locking voltage into the analog quantity of the initial locking voltage according to a frequency control code correspondence relationship, and the digital-to-analog converter 3 sends the converted analog quantity of the initial locking voltage to the adder 5.
In addition, the crystal oscillator 4 is connected with the phase frequency detector 9, and is used as a reference clock of the phase frequency detector 9 for providing a stable input signal for the phase frequency detector 9, the voltage-controlled oscillator 7 is also connected with the phase frequency detector 9, and the output signal of the voltage-controlled oscillator 7 and the input signal of the crystal oscillator 4 both flow into the input end of the phase frequency detector 9. In the phase frequency detector 9, the input signal provided by the crystal oscillator 4 is sampled by the output signal of the voltage controlled oscillator 7, so that the phase frequency detector 9 detects the phase difference and the frequency difference between the output signal of the voltage controlled oscillator 7 and the input signal provided by the crystal oscillator 4, and the phase difference and the frequency difference are converted into voltage signals by the phase frequency detector 9 to serve as the output signal of the phase frequency detector 9. The loop filter 10 is connected to the phase frequency detector 9, and the loop filter 10 is further connected to the adder 5, and is configured to filter an output signal of the phase frequency detector 9, and send the filtered output signal of the phase frequency detector 9 to the adder 5.
In this embodiment, the phase frequency detector 9 detects a comparison result between the reference frequency provided by the crystal oscillator 4 and the frequency of the output signal of the voltage controlled oscillator 7, and generates an error voltage according to the comparison result, that is, the frequency difference between the reference frequency and the frequency, where the error voltage is the output signal of the phase frequency detector 9, and then the high frequency component and the noise component of the error voltage are filtered by the loop filter 10 and transmitted to the adder 5. The adder 5 receives the analog quantity of the initial locking voltage provided by the digital-to-analog converter 3 and the filtered error voltage, and adds the analog quantity of the initial locking voltage and the filtered error voltage to obtain a preset voltage, so as to control the voltage-controlled oscillator 7 through the preset voltage, specifically, to control the voltage-controlled oscillator 7 to change the frequency of the voltage-controlled oscillator 7, thereby reducing the frequency difference of the digital phase-locked loop 6 and improving the frequency hopping time.
The voltage presetting device of the digital phase-locked loop provided by the embodiment comprises an analog-to-digital converter, a controller, a digital-to-analog converter, a crystal oscillator and an adder; the analog-to-digital converter is connected with the digital phase-locked loop and used for converting the analog quantity of the initial locking voltage of the digital phase-locked loop into the digital quantity of the initial locking voltage; the controller is connected with the analog-to-digital converter and used for sending the digital quantity of the initial locking voltage converted by the analog-to-digital converter to the digital-to-analog converter so that the digital-to-analog converter can convert the digital quantity of the initial locking voltage sent by the controller into the analog quantity of the initial locking voltage; the crystal oscillator is connected with the digital phase-locked loop and used for providing reference frequency for the digital phase-locked loop; the adder is connected with the digital-to-analog converter and used for adding an error voltage generated by the digital phase-locked loop according to the comparison result of the extracted frequency of the output signal and the reference frequency and the analog quantity of the converted initial locking voltage to obtain a preset voltage so as to tune the digital phase-locked loop through the preset voltage. The utility model discloses an initial locking voltage is obtained to the analog-to-digital conversion mode, compares in traditional method of roughly surveying initial locking voltage, and the initial locking voltage precision of surveying is higher, and consequently, the precision of the preset voltage based on initial locking voltage obtains is higher, can effectively adjust the frequency difference through this preset voltage regulation voltage controlled oscillator, improves the frequency hopping time.
On the basis of the above embodiments, the present embodiment sets the crystal oscillator 4 as an oven controlled crystal oscillator. In the present embodiment, the oven crystal oscillator is constituted by the oven control circuit and the oscillator circuit, and the present embodiment does not limit the structures of the oven control circuit and the oscillator circuit. Typically, an oven controlled crystal oscillator is temperature controlled using a differential series amplifier consisting of a bridge of thermistors.
In the embodiment, the crystal oscillator is set to be the oven controlled crystal oscillator, and compared with the temperature compensation type crystal oscillator, the precision and the stability of the reference frequency provided by the oven controlled crystal oscillator are higher, the precision and the stability of the error voltage generated based on the reference frequency and the frequency of the extracted output signal are effectively guaranteed, and the precision and the stability of the preset voltage are further improved.
On the basis of the above-described embodiment, the present embodiment packages the analog-to-digital converter 1, the controller 2, and the digital-to-analog converter 3 for replacement.
Specifically, after the analog-to-digital converter 1, the controller 2 and the digital-to-analog converter 3 are packaged, the analog-to-digital converter 1 is connected to the digital phase-locked loop 6, and the digital-to-analog converter 3 is connected to the adder 5. When any one or more of the analog-to-digital converter 1, the controller 2 and the digital-to-analog converter 3 are damaged, the packaged analog-to-digital converter 1, the controller 2 and the digital-to-analog converter 3 are integrally replaced, so that the fault reason can be effectively checked, and the time for replacing one by one can be effectively saved.
When the device is damaged, the analog-digital converter, the controller and the digital-analog converter are packaged in the embodiment, and the failure reason does not need to be checked or the device does not need to be replaced one by one in an integral replacement mode, so that the time can be effectively saved.
The above detailed description has been given to the embodiment of the voltage presetting device of the digital phase-locked loop, and the present invention also provides an embodiment of a digital phase-locked frequency synthesizer, which includes the voltage presetting device of the digital phase-locked loop.
It should be noted that the digital phase-locked frequency synthesizer may be a single-loop frequency synthesizer, a multiple-loop frequency synthesizer, or an integrated phase-locked frequency synthesizer, which is not limited in this embodiment.
It will be appreciated that the digital phase locked frequency synthesizer includes other components such as a digital phase locked loop 6 in addition to the voltage presetting means of the digital phase locked loop. The analog-to-digital converter 1 is connected to the digital phase-locked loop 6, and converts an analog quantity of an initial locking voltage of the digital phase-locked loop 6 into a digital quantity of the initial locking voltage, and in addition, the crystal oscillator 4 is also connected to the digital phase-locked loop 6 to provide a reference frequency for the digital phase-locked loop 6.
The digital phase-locked frequency synthesizer provided by the embodiment comprises a voltage presetting device of a digital phase-locked loop, wherein the device comprises an analog-to-digital converter, a controller, a digital-to-analog converter, a crystal oscillator and an adder; the analog-to-digital converter is connected with the digital phase-locked loop and used for converting the analog quantity of the initial locking voltage of the digital phase-locked loop into the digital quantity of the initial locking voltage; the controller is connected with the analog-to-digital converter and used for sending the digital quantity of the initial locking voltage converted by the analog-to-digital converter to the digital-to-analog converter so that the digital-to-analog converter can convert the digital quantity of the initial locking voltage sent by the controller into the analog quantity of the initial locking voltage; the crystal oscillator is connected with the digital phase-locked loop and used for providing reference frequency for the digital phase-locked loop; the adder is connected with the digital-to-analog converter and used for adding an error voltage generated by the digital phase-locked loop according to the comparison result of the extracted frequency of the output signal and the reference frequency and the analog quantity of the converted initial locking voltage to obtain a preset voltage so as to tune the digital phase-locked loop through the preset voltage. The digital phase-locked frequency synthesizer acquires the initial locking voltage in an analog-to-digital conversion mode, and compared with the traditional method for roughly measuring the initial locking voltage, the measured initial locking voltage has higher precision, so that the precision of the preset voltage acquired based on the initial locking voltage is higher, the frequency difference of the digital phase-locked loop can be effectively reduced by adjusting the voltage-controlled oscillator through the preset voltage, and the frequency hopping time is improved.
The above embodiments mention a digital phase locked frequency synthesizer comprising a digital phase locked loop 6 and voltage presetting means for the digital phase locked loop as shown in fig. 2. The structure of the digital phase-locked loop 6 shown in fig. 2 is explained below.
The digital phase-locked loop 6 is connected with a voltage presetting device of the digital phase-locked loop and comprises a voltage-controlled oscillator 7, a coupler 8, a phase frequency detector 9 and a loop filter 10; the voltage-controlled oscillator 7 is connected with the adder 5, and the voltage-controlled oscillator 7 is connected with the analog-to-digital converter 1 and used for providing analog quantity of initial locking voltage for the analog-to-digital converter 1; the coupler 8 is connected with the voltage-controlled oscillator 7 and is used for extracting an output signal of the voltage-controlled oscillator 7; the phase frequency detector 9 is connected with the coupler 8 and the crystal oscillator 4 and used for comparing the frequency of the output signal extracted by the coupler 8 with the reference frequency provided by the crystal oscillator 4 and generating error voltage according to the comparison result; the loop filter 10 is connected with the phase frequency detector 9, the loop filter 10 is connected with the adder 5, and the loop filter is used for filtering error voltage generated by the phase frequency detector 9 and sending the filtered error voltage to the adder 5.
It should be noted that the digital pll 6 provided in this embodiment is only a preferred embodiment, and in a specific implementation, the digital pll 6 may further include other devices such as an operational amplifier, which is not limited in this embodiment.
In this embodiment, the coupler 8 extracts the output signal of the voltage-controlled oscillator 7, so that the phase frequency detector 9 obtains the frequency of the output signal, the phase frequency detector 9 compares the frequency of the output signal with the reference frequency provided by the crystal oscillator 4, an error voltage is generated according to the frequency difference between the two frequencies, the loop filter 10 filters out the high-frequency component and the noise component of the error voltage and then transmits the filtered error voltage to the adder 5, and in addition, the voltage-controlled oscillator 7 is configured to provide the analog quantity of the initial locking voltage for the analog-to-digital converter 1, so as to generate the preset voltage according to the initial locking voltage and tune the voltage-controlled oscillator 7. It should be noted that the coupler 8 includes, but is not limited to, a directional coupler and a power divider, and may further include other components such as a microwave branch device. The phase frequency detector 9 that uses under the usual circumstances is sinusoidal type phase frequency detector, and loop filter 10 among the digital phase locked loop 6 is a low pass filter, has better band-pass filtering performance for high frequency component and noise component in the filtering phase frequency detector 9's the output signal, and in addition, loop filter 10 is including active loop filter and passive loop filter, can confirm the kind of loop filter 10 according to the digital phase locked loop 6 that chooses for use in concrete implementation.
The present embodiment provides a digital phase-locked loop, which is connected to a voltage presetting device of the digital phase-locked loop in the above embodiments, and includes a voltage-controlled oscillator, a coupler, a phase frequency detector, and a loop filter; the voltage-controlled oscillator is connected with the adder, connected with the analog-to-digital converter and used for providing analog quantity of initial locking voltage for the analog-to-digital converter; the coupler is connected with the voltage-controlled oscillator and used for extracting an output signal of the voltage-controlled oscillator; the phase frequency detector is connected with the coupler and the crystal oscillator and used for comparing the frequency of the output signal extracted by the coupler with the reference frequency provided by the crystal oscillator and generating error voltage according to the comparison result; the loop filter is connected with the phase frequency detector, connected with the adder and used for filtering error voltage generated by the phase frequency detector and sending the filtered error voltage to the adder. The digital phase-locked loop provided by the embodiment has a simple structure, and can effectively save cost while realizing the loop function.
On the basis of the above embodiment, the digital phase-locked frequency synthesizer in this embodiment further includes a frequency divider 11 connected to the coupler 8 and the phase frequency detector 9, and configured to calibrate the frequency of the output signal provided by the coupler 8 and send the calibrated frequency of the output signal to the phase frequency detector 9.
Specifically, after receiving the output signal of the voltage controlled oscillator 7 extracted by the coupler 8, the frequency divider 11 calibrates the frequency of the output signal to be an order of magnitude of a reference frequency, so that the phase frequency detector 9 compares the frequency of the output signal with the reference frequency and generates an error voltage according to a frequency difference between the two frequencies.
In this embodiment, the digital phase-locked frequency synthesizer includes a frequency divider connected to the coupler and the phase frequency detector, and is configured to calibrate the frequency of the output signal provided by the coupler and send the calibrated frequency of the output signal to the phase frequency detector, so that the phase frequency detector compares the calibrated frequency of the output signal with a reference frequency.
The above detailed description is directed to embodiments of a digital phase-locked frequency synthesizer, and the present invention further provides an electronic communication device including the digital phase-locked frequency synthesizer.
It will be appreciated that the electronic communication device includes other components, such as a microprocessor, in addition to the digital phase locked frequency synthesizer. The microprocessor is connected with the digital phase-locked frequency synthesizer and used for controlling the output frequency of the digital phase-locked frequency synthesizer, particularly, the microprocessor can be used for controlling the digital phase-locked frequency synthesizer to work and cut off, and in addition, the microprocessor is also used for controlling the digital phase-locked frequency synthesizer to be connected with a remote device, so that the multi-functionalization of the digital phase-locked frequency synthesizer is promoted.
The electronic communication device provided by the embodiment comprises a digital phase-locked frequency synthesizer, wherein the digital phase-locked frequency synthesizer comprises a voltage presetting device of a digital phase-locked loop. The voltage presetting device of the digital phase-locked loop comprises an analog-to-digital converter, a controller, a digital-to-analog converter, a crystal oscillator and an adder; the analog-to-digital converter is connected with the digital phase-locked loop and is used for converting the analog quantity of the initial locking voltage of the digital phase-locked loop into the digital quantity of the initial locking voltage; the controller is connected with the analog-to-digital converter and used for sending the digital quantity of the initial locking voltage converted by the analog-to-digital converter to the digital-to-analog converter so that the digital-to-analog converter can convert the digital quantity of the initial locking voltage sent by the controller into the analog quantity of the initial locking voltage; the crystal oscillator is connected with the digital phase-locked loop and used for providing reference frequency for the digital phase-locked loop; the adder is connected with the digital-to-analog converter and used for adding an error voltage generated by the digital phase-locked loop according to a comparison result of the extracted frequency of the output signal and the reference frequency and an analog quantity of the converted initial locking voltage to obtain a preset voltage, and the digital phase-locked loop is tuned through the preset voltage, so that the electronic communication device obtains the initial locking voltage through an analog-to-digital conversion mode.
On the basis of the above embodiment, the electronic communication device in this embodiment further includes a display screen connected to the digital phase-locked frequency synthesizer, for displaying the frequency output by the digital phase-locked frequency synthesizer.
Specifically, the digital phase-locked frequency synthesizer is a signal source which generates a large amount of discrete output frequencies at certain frequency intervals by four arithmetic operations on frequencies, so that a user can conveniently know the output frequency condition of the digital phase-locked frequency synthesizer, the frequency output by the digital phase-locked frequency synthesizer needs to be displayed in real time through a display screen, and particularly when the frequency output is abnormal, the user can know the frequency output condition through the display screen so as to locate the reason of the abnormality and take measures.
In this embodiment, the electronic communication device includes a display screen connected to the digital phase-locked frequency synthesizer for displaying the frequency output by the digital phase-locked frequency synthesizer, so that a user can conveniently grasp the condition of the output frequency of the digital phase-locked frequency synthesizer, and particularly, when the frequency output is abnormal, the user can conveniently locate the reason for the abnormality and take measures.
It is right above that the present invention provides a voltage presetting device, a digital phase-locked frequency synthesizer and an electronic communication device for a digital phase-locked loop. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
Claims (8)
1. A voltage presetting device for a digital phase-locked loop, comprising: the device comprises an analog-to-digital converter (1), a controller (2), a digital-to-analog converter (3), a crystal oscillator (4) and an adder (5);
the analog-to-digital converter (1) is connected with the digital phase-locked loop (6) and is used for converting an analog quantity of an initial locking voltage of the digital phase-locked loop (6) into a digital quantity of the initial locking voltage;
the controller (2) is connected with the analog-to-digital converter (1) and is used for sending the digital quantity of the initial locking voltage converted by the analog-to-digital converter (1) to the digital-to-analog converter (3), so that the digital-to-analog converter (3) converts the digital quantity of the initial locking voltage sent by the controller (2) into the analog quantity of the initial locking voltage;
the crystal oscillator (4) is connected with the digital phase-locked loop (6) and is used for providing a reference frequency for the digital phase-locked loop (6);
the adder (5) is connected with the digital-to-analog converter (3) and is used for adding an error voltage generated by the digital phase-locked loop (6) according to the comparison result of the frequency of the extracted output signal and the reference frequency and the analog quantity of the converted initial locking voltage to obtain a preset voltage, so that the digital phase-locked loop (6) can be tuned through the preset voltage.
2. The voltage presetting device of a digital phase locked loop according to claim 1, characterized in that the crystal oscillator (4) is an oven controlled crystal oscillator.
3. The voltage presetting device of a digital phase locked loop according to claim 1, characterized in that the analog-to-digital converter (1), the controller (2) and the digital-to-analog converter (3) are encapsulated.
4. A digital phase locked frequency synthesizer comprising the voltage presetting device of a digital phase locked loop according to any one of claims 1 to 3.
5. A digital phase locked frequency synthesizer according to claim 4 further comprising a digital phase locked loop (6) connected to the voltage presetting means of the digital phase locked loop;
the digital phase-locked loop (6) comprises a voltage-controlled oscillator (7), a coupler (8), a phase frequency detector (9) and a loop filter (10);
the voltage-controlled oscillator (7) is connected with the adder (5), and the voltage-controlled oscillator (7) is connected with the analog-to-digital converter (1) and used for providing the analog quantity of the initial locking voltage for the analog-to-digital converter (1);
the coupler (8) is connected with the voltage-controlled oscillator (7) and is used for extracting the output signal of the voltage-controlled oscillator (7);
the phase frequency detector (9) is connected with the coupler (8), the phase frequency detector (9) is connected with the crystal oscillator (4), and the phase frequency detector is used for comparing the frequency of an output signal extracted by the coupler (8) with a reference frequency provided by the crystal oscillator (4) and generating an error voltage according to a comparison result;
the loop filter (10) is connected with the phase frequency detector (9), the loop filter (10) is connected with the adder (5) and used for filtering the error voltage generated by the phase frequency detector (9) and sending the filtered error voltage to the adder (5).
6. A digital phase locked frequency synthesizer according to claim 5, further comprising a frequency divider (11) connected to the coupler (8) and the phase frequency detector (9) for calibrating the frequency of the output signal provided by the coupler (8) and for sending the calibrated frequency of the output signal to the phase frequency detector (9).
7. An electronic communication device comprising a digital phase locked frequency synthesizer according to any one of claims 4 to 6.
8. The electronic communication device of claim 7, further comprising a display screen coupled to the digital phase-locked frequency synthesizer.
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