CN105515575A - Sinusoidal signal frequency generator - Google Patents
Sinusoidal signal frequency generator Download PDFInfo
- Publication number
- CN105515575A CN105515575A CN201510895041.6A CN201510895041A CN105515575A CN 105515575 A CN105515575 A CN 105515575A CN 201510895041 A CN201510895041 A CN 201510895041A CN 105515575 A CN105515575 A CN 105515575A
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- frequency
- phase
- locked loop
- output
- low pass
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- 239000013078 crystal Substances 0.000 claims abstract description 8
- 230000010355 oscillation Effects 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000035559 beat frequency Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
- H03L7/0995—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop the oscillator comprising a ring oscillator
-
- 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
- H03B28/00—Generation of oscillations by methods not covered by groups H03B5/00 - H03B27/00, including modification of the waveform to produce sinusoidal oscillations
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Theoretical Computer Science (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention discloses a sinusoidal signal frequency generator, comprising a phase-locked loop connected to a crystal oscillator; a low pass filter connected to the output end of the phase-locked loop; and a voltage-controlled oscillator connected to the output end of the low pass filter; one way of the output end of the voltage-controlled oscillator is fed back to the phase-locked loop through a frequency multiplier circuit; the other way is output to an amplifier; the output end of the amplifier is connected to the control end of a switch driver; the frequency multiplier circuit comprises a 3 frequency multiplier, a 6 frequency multiplier and a 9 frequency multiplier which are connected in parallel; the 3 frequency multiplier and the 6 frequency multiplier are respectively connected to the phase-locked loop by a first adjusting switch and a second adjusting switch. According to the sinusoidal signal frequency of the invention, multi-gear adjustment of the output frequency is realized under the condition that the oscillation frequency of the crystal oscillator is fixed, and the output frequency of the sinusoidal signal frequency generator can be set conveniently through the gears on the outer surface by a user.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of sinusoidal signal frequency generator.
Background technology
Signal generator, for generation of the electric test signal of special parameter needed for circuit-under-test.When testing, studying or adjust electronic circuit and equipment, for measuring some electric parameters of circuit, as frequency response, noise factor, for voltmeter is spent surely, all require to provide the signal of telecommunication meeting determined technical conditions, to simulate the pumping signal of the Devices to test used in real work.
When requiring the steady-state characteristic of carrying out system to measure, the sine signal source that amplitude, frequency are known need be used.When the transient response of test macro, need again the rectangular pulse source using leading edge time, pulse duration and repetition period known.And require the parameter that signal source outputs signal, as frequency, waveform, output voltage or power etc., accurate adjustment can be carried out within the specific limits, have good stability have and export instruction.
Signal source according to the difference of output waveform, can be divided into the four large classes such as sine wave signal generator, rectangular pulse signal generator, function signal generator and random signal generator.
Sinusoidal signal is most popular test signal, this is because the Measures compare producing sinusoidal signal is simple, and measures more convenient by sinusoidal signal.
Sinusoidal signal frequency generator: sinusoidal signal is mainly used in the frequency characteristic of measuring circuit and system, nonlinear distortion, gain and sensitivity etc.Low frequency generator, high frequency signal generator and microwave signal generator is divided into by frequency coverage; Simplfied signal generator (i.e. signal source), standard signal generator (power output can decay to below-100 dBms exactly) and power signal generator (power output reaches more than tens of milliwatt) is divided into by output level adjustable extent and stability; Tuner-type signal generator, sweep-frequency Békésy audiometer signal generator, program control type signal generator and frequency synthesising type signal generator etc. are divided into by the mode of frequency shift.
Low frequency generator comprises the sine-wave generator of audio frequency (200 ~ 20000 hertz) and video (1 hertz ~ 10 megahertz) scope.Master-oscillator generally uses RC formula oscillator, also can use beat frequency oscillator.For ease of the frequency characteristic of test macro, require to export the gentle wave distortion of amplitude-frequency characteristic little.
High frequency signal generator, frequency is the high frequency of 100 kilo hertzs ~ 30 megahertzes, the very high frequency signal generator of 30 ~ 300 megahertzes.General employing LC tuned resonator, frequency can be read by the circular graduation of tuning capacitor, main application measures the technical indicator of various receiver, and output signal useable internal or additional Low Frequency Sine Signals amplitude modulation or frequency modulation, enable output carrier voltage decay to below 1 microvolt.
Microwave signal generator, from decimeter wave until the signal generator of millimeter wave band.Signal usually by ultrahigh frequency triode and the reflex klystron generation of band distributed constant resonant cavity, but has gradually by the trend of the solid state device replacements such as microwave transistor, field effect transistor and Gunn diode.Instrument generally changes frequency by mechanical tuning cavity, and about every platform can cover an octave, the signal power be coupled out by cavity generally can reach more than 10 milliwatts.Simple signal source is only required and can be added 1000 hertz of square wave amplitude modulation, and standard signal generator then can by output reference level adjustment to 1 milliwatt, then from after with the dBm value of attenuator read output signal level; Also must there be inner or additional rectangular pulse amplitude modulation, to test the receivers such as radar.
Existing sinusoidal signal frequency generator can only a kind of signal of single output, and as low frequency signal, high-frequency signal or microwave signal, how providing the sinusoidal signal frequency generator that one kind of multiple signals export, is current problem demanding prompt solution.
Summary of the invention
In order to address the deficiencies of the prior art, the present invention proposes a kind of sinusoidal signal frequency generator, sine wave output signal.
Technical scheme of the present invention is achieved in that
A kind of sinusoidal signal frequency generator, comprising:
Comprise phase-locked loop, it is connected to crystal oscillator;
Described phase-locked loop is DDS digital phase-locked loop, comprising: phase accumulator, waveform ROM, D/A converter and low pass filter;
After clock frequency is given, the frequency of output signal depends on frequency controller, and frequency resolution depends on accumulator figure place, and phase resolution depends on the address wire figure place of ROM, and amplitude quantizing noise depends on data bit word length and the D/A converter figure place of ROM;
Low pass filter, is connected to the output of phase-locked loop, and described low pass filter is Butterworth filter;
Voltage controlled oscillator, is connected to low pass filter output, and its output is leaded up to frequency multiplier circuit and fed back to phase-locked loop, and another road exports amplifier to, and the output of amplifier is connected to the control end of described switch driver;
Described frequency multiplier circuit comprises 3 frequency multipliers, 6 frequency multipliers that are connected in parallel, and described 3 frequency multipliers, 6 frequency multipliers are connected to described phase-locked loop respectively by the first by-pass cock, the second by-pass cock;
The button that described first by-pass cock, the second by-pass cock touch with hand is connected.
Alternatively, described low pass filter is second order Butterworth filter.
The invention has the beneficial effects as follows:
Under the frequency of oscillation fixing situation of crystal oscillator, many grades that can realize output frequency adjustable, and user can set the output frequency of sinusoidal signal frequency generator, for various application scenario provides suitable reference frequency signal easily by the gear of outer surface.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the control block diagram of sinusoidal signal frequency generator of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, sinusoidal signal frequency generator 40 of the present invention, comprises phase-locked loop 41, and it is connected to crystal oscillator 100; Low pass filter 42, is connected to the output of phase-locked loop 41; Voltage controlled oscillator 43, its output is leaded up to frequency multiplier circuit and is fed back to phase-locked loop, and another road exports amplifier 44 to, and the output of amplifier 44 exports first frequency signal f and is connected to the control end of described switch driver 13.Preferably, the frequency of oscillation of described crystal oscillator 100 is 100MHz.
Described frequency multiplier circuit comprises 3 frequency multiplier 45,6 frequency multiplier 46,3 frequency multipliers, 6 frequency multipliers that are connected in parallel and is connected to phase-locked loop 41 respectively by the first by-pass cock 51, second by-pass cock 52; Described first by-pass cock 51, second by-pass cock 52 is connected with the button on outer surface, on button, mark has frequency values, such as 1,2 grade, by operating the turn-on and turn-off of the corresponding by-pass cock of button control of outer surface, control first frequency signal f, realize the adjustment of frequency.
Preferably, described low pass filter is Butterworth filter.
The feature of Butterworth filter is that the frequency response curve in passband is smooth to greatest extent, does not does not rise and fall, then drops to zero gradually at suppressed frequency band.On the Bode diagram of the logarithm diagonal frequencies of amplitude, from a certain rim angle frequency, amplitude the increase of angular frequency and gradually reduces, trend minus infinity.
The attenuation rate of single order Butterworth filter is every frequency multiplication 6 decibels, every ten frequency multiplication 20 decibels.The attenuation rate of second order Butterworth filter is every frequency multiplication 12 decibels, the attenuation rate of three rank Butterworth filters is every frequency multiplication 18 decibels, so analogizes.
Preferably, described low pass filter is second order Butterworth filter.
Preferably, described phase-locked loop is DDS digital phase-locked loop.
Direct digital synthesis technique (DDS-DigitalDirectFrequencySynthesis) technology is a kind of new frequency combining method, it is the revolution of frequency synthesis technique, along with the actual needs in electronic engineering field and the development of digital integrated circuit and microelectric technique, DDS technology manifests its superiority day by day.
DDS is a kind of frequency synthesizer of total digitalization, is made up of phase accumulator, waveform ROM, D/A converter and low pass filter.After clock frequency is given, the frequency of output signal depends on frequency controller, and frequency resolution depends on accumulator figure place, and phase resolution depends on the address wire figure place of ROM, and amplitude quantizing noise depends on data bit word length and the D/A converter figure place of ROM.
DDS has the following advantages:
(1) frequency resolution is high, exports frequency many, can reach N number of frequency (N is phase accumulator figure place);
(2) frequency error factor speed is fast, can reach us magnitude;
(3) Phase Continuation during frequency error factor;
(4) wideband orthogonal signal can be exported;
(5) export phase noise low, effect is improved to the phase noise of reference frequency source;
(6) random waveform can be produced;
(7) total digitalization realizes, and be convenient to integrated, volume is little, lightweight.
Sinusoidal signal frequency generator of the present invention, under the frequency of oscillation fixing situation of crystal oscillator, many grades that can realize output frequency adjustable, user can set the output frequency of sinusoidal signal frequency generator, for various application scenario provides suitable reference frequency signal easily by the gear of outer surface.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. a sinusoidal signal frequency generator, is characterized in that, comprising:
Comprise phase-locked loop, it is connected to crystal oscillator;
Described phase-locked loop is DDS digital phase-locked loop, comprising: phase accumulator, waveform ROM, D/A converter and low pass filter;
After clock frequency is given, the frequency of output signal depends on frequency controller, and frequency resolution depends on accumulator figure place, and phase resolution depends on the address wire figure place of ROM, and amplitude quantizing noise depends on data bit word length and the D/A converter figure place of ROM;
Low pass filter, is connected to the output of phase-locked loop, and described low pass filter is Butterworth filter;
Voltage controlled oscillator, is connected to low pass filter output, and its output is leaded up to frequency multiplier circuit and fed back to phase-locked loop, and another road exports amplifier to, and the output of amplifier is connected to the control end of described switch driver;
Described frequency multiplier circuit comprises 3 frequency multipliers, 6 frequency multipliers that are connected in parallel, and described 3 frequency multipliers, 6 frequency multipliers are connected to described phase-locked loop respectively by the first by-pass cock, the second by-pass cock;
The button that described first by-pass cock, the second by-pass cock touch with hand is connected.
2. sinusoidal signal frequency generator as claimed in claim 1, it is characterized in that, described low pass filter is second order Butterworth filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510895041.6A CN105515575A (en) | 2015-12-05 | 2015-12-05 | Sinusoidal signal frequency generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510895041.6A CN105515575A (en) | 2015-12-05 | 2015-12-05 | Sinusoidal signal frequency generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105515575A true CN105515575A (en) | 2016-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510895041.6A Withdrawn CN105515575A (en) | 2015-12-05 | 2015-12-05 | Sinusoidal signal frequency generator |
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| Country | Link |
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| CN (1) | CN105515575A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000224028A (en) * | 1999-01-29 | 2000-08-11 | Ando Electric Co Ltd | Pll circuit and method for controlling the circuit |
| CN102201819A (en) * | 2011-03-07 | 2011-09-28 | 武汉理工大学 | Frequency synthesis source applied by DDS short-wave transmitter based on CPLD design |
| CN103178838A (en) * | 2011-12-21 | 2013-06-26 | 北京普源精电科技有限公司 | Device and method for frequency synthesis of phase-locked loop or phase-locked ring |
| CN103647553A (en) * | 2013-12-13 | 2014-03-19 | 中国电子科技集团公司第四十一研究所 | Direct current frequency modulation reference source circuit of broadband ultra low phase noise |
| CN104836581A (en) * | 2015-05-21 | 2015-08-12 | 南京熊猫电子股份有限公司 | High-performance broadband frequency source generation circuit employing multi-harmonic reference, and generation method |
| CN204597935U (en) * | 2015-04-02 | 2015-08-26 | 河海大学 | A kind of Direct Digital Phase locking frequency synthesis device |
-
2015
- 2015-12-05 CN CN201510895041.6A patent/CN105515575A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000224028A (en) * | 1999-01-29 | 2000-08-11 | Ando Electric Co Ltd | Pll circuit and method for controlling the circuit |
| CN102201819A (en) * | 2011-03-07 | 2011-09-28 | 武汉理工大学 | Frequency synthesis source applied by DDS short-wave transmitter based on CPLD design |
| CN103178838A (en) * | 2011-12-21 | 2013-06-26 | 北京普源精电科技有限公司 | Device and method for frequency synthesis of phase-locked loop or phase-locked ring |
| CN103647553A (en) * | 2013-12-13 | 2014-03-19 | 中国电子科技集团公司第四十一研究所 | Direct current frequency modulation reference source circuit of broadband ultra low phase noise |
| CN204597935U (en) * | 2015-04-02 | 2015-08-26 | 河海大学 | A kind of Direct Digital Phase locking frequency synthesis device |
| CN104836581A (en) * | 2015-05-21 | 2015-08-12 | 南京熊猫电子股份有限公司 | High-performance broadband frequency source generation circuit employing multi-harmonic reference, and generation method |
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Application publication date: 20160420 |
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| WW01 | Invention patent application withdrawn after publication |