CN105445510A - Signal generation device - Google Patents
Signal generation device Download PDFInfo
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- CN105445510A CN105445510A CN201510844298.9A CN201510844298A CN105445510A CN 105445510 A CN105445510 A CN 105445510A CN 201510844298 A CN201510844298 A CN 201510844298A CN 105445510 A CN105445510 A CN 105445510A
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- frequency
- generation device
- signal generation
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Abstract
The invention discloses a signal generation device, comprising a phase-locked loop connected to a crystal oscillator, a low pass filter connected to the output terminal of the phase-locked loop, and a voltage controlled oscillator connected to the output terminal of the low pass filter; one path of the output terminal returns the feedback to the phase-locked loop through a frequency multiplier circuit; the other path of the output terminal is outputted to an amplifier; the output terminal of the amplifier is connected to the control terminal 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, the 6 frequency multiplier and the 9 frequency multiplier are connected to the phase-locked loop through a first regulation switch, a second regulation switch and a third regulation switch. The signal generation device can realize the multi-gear-regulation of the output frequency under the oscillation frequency of the crystal oscillator is fixed, and the user can conveniently set the output frequency of the signal generation device.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of signal generation device.
Background technology
Signal generation device, 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 figure, for voltage table is spent surely, all require to provide the electric signal 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 rect.p. source using leading edge time, pulse width 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 generation device, rectangular pulse signal generation device, function signal generation device and random signal generating apparatus.
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 generation device: sinusoidal signal is mainly used in the frequency characteristic of metering circuit and system, nonlinear distortion, gain and sensitivity etc.Low frequency signal generation device, high-frequency signal generation device and microwave signal generation device is divided into by frequency coverage; Simple signal generation device (i.e. signal source), standard signal generation device (output power can decay to below-100 dBms exactly) and power signal generation device (output power reaches more than tens of milliwatt) is divided into by output level adjustable extent and degree of stability; Tuner-type signal generation device, sweep-frequency Békésy audiometer signal generation device, program control type signal generation device and frequency synthesising type signal generation device etc. are divided into by the mode of frequency shift.
Low frequency signal generation device 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 waveform distortion of amplitude versus frequency characte little.
High-frequency signal generation device, frequency is the high frequency of 100 kilo hertzs ~ 30 megahertzes, the very high frequency(VHF) signal generation device 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 generation device, from decimetric wave until the signal generation device of millimeter wave band.Signal usually by ultrahigh frequency triode and the reflex klystron generation of band distribution parameter resonator 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 generation device 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 rect.p. amplitude modulation, to test the receivers such as radar.
Existing sinusoidal signal generation device 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 generation device 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 signal generation device, sine wave output signal.
Technical scheme of the present invention is achieved in that
A kind of signal generation device, comprising:
Comprise phaselocked loop, it is connected to crystal oscillator, and described phaselocked loop is digital phase-locked loop, comprise phase reference extract circuit, crystal oscillator, frequency divider, phase comparator, pulse mend smear door; Signal frequency and the required frequency of frequency divider output are very close, itself and the phase reference signal that extracts from signal are sent into phase comparator simultaneously, just smear door to erase the pulse of an input frequency divider by mending when comparative result illustrates that local frequency is high, be equivalent to local oscillating frequency and reduce; On the contrary, if just insert a pulse between two input pulses of fraction frequency device input end when illustrating that local frequency is low, be equivalent to local oscillating frequency and rise, thus reach synchronous;
Low-pass filter, is connected to the output terminal of phaselocked loop, and described low-pass filter is Chebyshev filter;
Voltage controlled oscillator, is connected to low-pass filter output terminal, and its output terminal is leaded up to frequency multiplier circuit and fed back to phaselocked loop, and another road exports amplifier to, and the output terminal of amplifier is connected to the control end of described switch driver;
Described frequency multiplier circuit comprises 3 frequency multipliers, 6 frequency multipliers and 9 frequency multipliers that are connected in parallel, and described 3 frequency multipliers, 6 frequency multipliers and 9 frequency multipliers are connected to described phaselocked loop respectively by the first by-pass cock, the second by-pass cock and the 3rd by-pass cock;
The button that described first by-pass cock, the second by-pass cock touch with the 3rd by-pass cock and hand is connected.
Alternatively, described low-pass filter is second order Chebyshev filter.
The invention has the beneficial effects as follows:
Under the oscillation frequency fixing situation of crystal oscillator, many grades that can realize output frequency adjustable, and user can the output frequency of setting signal generation device easily by the gear of outside surface, for various application scenario provides suitable reference frequency signal.
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 signal generation device 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, signal generation device 40 of the present invention, comprises phaselocked loop 41, and it is connected to crystal oscillator 100; Low-pass filter 42, is connected to the output terminal of phaselocked loop 41; Voltage controlled oscillator 43, its output terminal is leaded up to frequency multiplier circuit and is fed back to phaselocked loop, and another road exports amplifier 44 to, and the output terminal of amplifier 44 exports first frequency signal f and is connected to the control end of described switch driver 13.Preferably, the oscillation frequency of described crystal oscillator 100 is 100MHz.
Described frequency multiplier circuit comprises 3 frequency multiplier 45,6 frequency multiplier 46 and 9 frequency multiplier 47,3 frequency multipliers, 6 frequency multipliers and 9 frequency multipliers that are connected in parallel and is connected to phaselocked loop 41 respectively by the first by-pass cock 51, second by-pass cock 52 and the 3rd by-pass cock 53; Described first by-pass cock 51, second by-pass cock 52 is connected with the button on outside surface with the 3rd by-pass cock 53, on button, mark has frequency values, such as 1,2,3 grade, by operating the turn-on and turn-off of the corresponding by-pass cock of button control of outside surface, control first frequency signal f, realize the adjustment of frequency.
Preferably, described low-pass filter is Chebyshev filter.
Chebyshev filter is faster than the decay of Butterworth filter in transitional zone, but the amplitude versus frequency characte of frequency response is smooth not as the latter.Error between Chebyshev filter and the frequency response curve of ideal filter is minimum, but there is amplitude fluctuation in passband.
Preferably, described low-pass filter is second order Chebyshev filter.
Preferably, described phaselocked loop is digital phase-locked loop.
Digital phase-locked loop extracts circuit primarily of phase reference, compositions such as smearing is mended in crystal oscillator, frequency divider, phase comparator, pulse.Signal frequency and the required frequency of frequency divider output are very close, phase comparator is sent in it and the phase reference signal that extracts from signal simultaneously, just smear door to erase the pulse of an input frequency divider by mending when comparative result illustrates that local frequency is high, be equivalent to local oscillating frequency and reduce; On the contrary, if just insert a pulse between two input pulses of fraction frequency device input end when illustrating that local frequency is low, be equivalent to local oscillating frequency and rise, thus reach synchronous.
Preferably, described digital phase-locked loop is DDS.
Signal generation device of the present invention, under the oscillation frequency fixing situation of crystal oscillator, many grades that can realize output frequency adjustable, and user can the output frequency of setting signal generation device easily by the gear of outside surface, for various application scenario provides suitable reference frequency signal.
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 signal generation device, is characterized in that, comprising:
Comprise phaselocked loop, it is connected to crystal oscillator, and described phaselocked loop is digital phase-locked loop, comprise phase reference extract circuit, crystal oscillator, frequency divider, phase comparator, pulse mend smear door; Signal frequency and the required frequency of frequency divider output are very close, itself and the phase reference signal that extracts from signal are sent into phase comparator simultaneously, just smear door to erase the pulse of an input frequency divider by mending when comparative result illustrates that local frequency is high, be equivalent to local oscillating frequency and reduce; On the contrary, if just insert a pulse between two input pulses of fraction frequency device input end when illustrating that local frequency is low, be equivalent to local oscillating frequency and rise, thus reach synchronous;
Low-pass filter, is connected to the output terminal of phaselocked loop, and described low-pass filter is Chebyshev filter;
Voltage controlled oscillator, is connected to low-pass filter output terminal, and its output terminal is leaded up to frequency multiplier circuit and fed back to phaselocked loop, and another road exports amplifier to, and the output terminal of amplifier is connected to the control end of described switch driver;
Described frequency multiplier circuit comprises 3 frequency multipliers, 6 frequency multipliers and 9 frequency multipliers that are connected in parallel, and described 3 frequency multipliers, 6 frequency multipliers and 9 frequency multipliers are connected to described phaselocked loop respectively by the first by-pass cock, the second by-pass cock and the 3rd by-pass cock;
The button that described first by-pass cock, the second by-pass cock touch with the 3rd by-pass cock and hand is connected.
2. signal generation device as claimed in claim 1, it is characterized in that, described low-pass filter is second order Chebyshev filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510844298.9A CN105445510A (en) | 2015-11-26 | 2015-11-26 | Signal generation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510844298.9A CN105445510A (en) | 2015-11-26 | 2015-11-26 | Signal generation device |
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| Publication Number | Publication Date |
|---|---|
| CN105445510A true CN105445510A (en) | 2016-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510844298.9A Withdrawn CN105445510A (en) | 2015-11-26 | 2015-11-26 | Signal generation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252145A (en) * | 2019-07-15 | 2019-09-20 | 派纳斯有限公司 | A kind of electro-osmosis water proof equipment and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101924537A (en) * | 2009-06-17 | 2010-12-22 | 华东电力试验研究院有限公司 | Merging unit synchronizing method and system based on power grid cyclic wave |
| CN203815782U (en) * | 2014-04-18 | 2014-09-10 | 韩美艳 | High-stability infant caring box |
| CN203836622U (en) * | 2014-04-18 | 2014-09-17 | 刘泽淼 | Portable table lamp |
| CN203851329U (en) * | 2014-04-18 | 2014-09-24 | 万煜 | Power optimal controlled table lamp |
-
2015
- 2015-11-26 CN CN201510844298.9A patent/CN105445510A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101924537A (en) * | 2009-06-17 | 2010-12-22 | 华东电力试验研究院有限公司 | Merging unit synchronizing method and system based on power grid cyclic wave |
| CN203815782U (en) * | 2014-04-18 | 2014-09-10 | 韩美艳 | High-stability infant caring box |
| CN203836622U (en) * | 2014-04-18 | 2014-09-17 | 刘泽淼 | Portable table lamp |
| CN203851329U (en) * | 2014-04-18 | 2014-09-24 | 万煜 | Power optimal controlled table lamp |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252145A (en) * | 2019-07-15 | 2019-09-20 | 派纳斯有限公司 | A kind of electro-osmosis water proof equipment and system |
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Application publication date: 20160330 |