CN105515573A - Frequency signal source - Google Patents

Frequency signal source Download PDF

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Publication number
CN105515573A
CN105515573A CN201510874640.XA CN201510874640A CN105515573A CN 105515573 A CN105515573 A CN 105515573A CN 201510874640 A CN201510874640 A CN 201510874640A CN 105515573 A CN105515573 A CN 105515573A
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CN
China
Prior art keywords
frequency
phase
signal source
locked loop
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201510874640.XA
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Chinese (zh)
Inventor
刘海生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Shengjia Information Technology Co Ltd
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Qingdao Shengjia Information Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to CN201510874640.XA priority Critical patent/CN105515573A/en
Publication of CN105515573A publication Critical patent/CN105515573A/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

The invention proposes a frequency signal source. The frequency signal source comprises 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, wherein one part of the output end of the voltage-controlled oscillator is fed back to the phase-locked loop through a frequency multiplier circuit while the other part of the output end of the voltage-controlled oscillator is connected to the control end of a switch driver; the frequency multiplier circuit comprises a tripler, a sextupler and a nonupler that are connected in parallel; and the tripler, the sextupler and the nonupler are connected to the phase-locked loop through a first adjustment switch, a second adjustment switch and a third adjustment switch respectively. According to the frequency signal source, the multi-shift adjustability of the output frequency can be realized under the condition that the oscillation frequency of the crystal oscillator is fixed, and a user can conveniently set the output frequency of the frequency signal source through shifts on the outer surface.

Description

A kind of frequency signal source
Technical field
The present invention relates to electronic technology field, particularly a kind of frequency signal source.
Background technology
Signal source, 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 source, rectangular pulse signal source, function signal source and random signal source.
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.
Sine signal source: sinusoidal signal is mainly used in the frequency characteristic of measuring circuit and system, nonlinear distortion, gain and sensitivity etc.Low frequency signal source, high-frequency signal source and microwave signal source is divided into by frequency coverage; Simple signal source (i.e. signal source), standard signal source (power output can decay to below-100 dBms exactly) and power signal source (power output reaches more than tens of milliwatt) is divided into by output level adjustable extent and stability; Tuner-type signal source, sweep-frequency Békésy audiometer signal source, program control type signal source and frequency synthesising type signal source etc. are divided into by the mode of frequency shift.
Low frequency signal source 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 source, frequency is the high frequency of 100 kilo hertzs ~ 30 megahertzes, the very high frequency(VHF) signal source 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 source, from decimeter wave until the signal source 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 source 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 sine signal source can only a kind of signal of single output, and as low frequency signal, high-frequency signal or microwave signal, the sine signal source how providing one kind of multiple signals to 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 frequency signal source, sine wave output signal.
Technical scheme of the present invention is achieved in that
A kind of frequency signal source, comprising:
Comprise phase-locked loop, it is connected to crystal oscillator, and described phase-locked loop is analog phase-locked look, comprises phase reference and extracts circuit, voltage controlled oscillator, phase comparator, control circuit;
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 voltage controlled oscillator is that carat sprinkles type LC voltage controlled oscillator, comprising: transistor T, loop inductance L, tank capacitance C1, C2, Cv, the capacity presented when Cv is variable capacitance diode reverse bias; C1, C2 are more much bigger than Cv;
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 phase-locked 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 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 the output frequency of setpoint frequency signal source easily by the gear of outer 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 frequency signal source 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, frequency signal source 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 and 9 frequency multiplier 47,3 frequency multipliers, 6 frequency multipliers and 9 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 and the 3rd by-pass cock 53; Described first by-pass cock 51, second by-pass cock 52 is connected with the button on outer 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 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 voltage controlled oscillator is LC oscillator.
In any one LC oscillator, voltage-controlled variable reactance component is inserted oscillation circuit and just can form LC voltage controlled oscillator.Early stage voltage-controlled variable reactance component is reactance-tube, mostly uses variable capacitance diode afterwards.
Preferably, LC oscillator of the present invention is that carat sprinkles type LC voltage controlled oscillator, comprising: transistor T, loop inductance L, tank capacitance C1, C2, Cv, the capacity presented when Cv is variable capacitance diode reverse bias; C1, C2 are usually much bigger than Cv.When input control voltage uc changes, Cv changes thereupon, thus changes frequency of oscillation.Pass between the output frequency of this voltage controlled oscillator and input control voltage is:
ω 0 ≈ 1 LC 0 ( 1 + u c φ ) γ / 2
C in formula 0the capacitance of variable capacitance diode when being zero reverse biased; it is the junction voltage of variable capacitance diode; γ is junction capacitance variability index.In order to obtain Linear Control characteristic, various indemnifying measure can be taked.
Preferably, described phase-locked loop is analog phase-locked look, comprises phase reference and extracts circuit, voltage controlled oscillator, phase comparator, control circuit.
What voltage controlled oscillator exported is the constant-amplitude signal very close with needing frequency, it with extract the reference signal extracted from signal of circuit by phase reference and send into phase comparator simultaneously, make the frequency of voltage controlled oscillator to the direction consecutive variations reducing Error Absolute Value by the error comparing formation by control circuit, realize phase-locked, thus reach synchronous.
Frequency signal source of the present invention, under the frequency of oscillation fixing situation of crystal oscillator, many grades that can realize output frequency adjustable, and user can the output frequency of setpoint frequency signal source easily by the gear of outer 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 frequency signal source, is characterized in that, comprising:
Comprise phase-locked loop, it is connected to crystal oscillator, and described phase-locked loop is analog phase-locked look, comprises phase reference and extracts circuit, voltage controlled oscillator, phase comparator, control circuit;
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 voltage controlled oscillator is that carat sprinkles type LC voltage controlled oscillator, comprising: transistor T, loop inductance L, tank capacitance C1, C2, Cv, the capacity presented when Cv is variable capacitance diode reverse bias; C1, C2 are more much bigger than Cv;
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 phase-locked 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. frequency signal source as claimed in claim 1, it is characterized in that, described low pass filter is second order Butterworth filter.
CN201510874640.XA 2015-12-02 2015-12-02 Frequency signal source Withdrawn CN105515573A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN87105936A (en) * 1987-12-12 1988-06-08 南京工学院 Frequency modulation one-way single-carr generator
JP2006228346A (en) * 2005-02-18 2006-08-31 Sony Corp Apparatus and method for reproducing recording medium, and digital pll circuit
CN101039117A (en) * 2007-02-16 2007-09-19 中国科学院武汉物理与数学研究所 Rubidium atom frequency scale digital phase-locking frequency doubler
CN102820887A (en) * 2011-06-08 2012-12-12 美国亚德诺半导体公司 Hybrid digital-analog phase locked loops
CN103427836A (en) * 2013-07-25 2013-12-04 京东方科技集团股份有限公司 Frequency signal generation system and display device
CN104759349A (en) * 2015-03-23 2015-07-08 河北师范大学 A device of eliminating fog and thick haze by utilization of large-power microwave electromagnetic waves

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN87105936A (en) * 1987-12-12 1988-06-08 南京工学院 Frequency modulation one-way single-carr generator
JP2006228346A (en) * 2005-02-18 2006-08-31 Sony Corp Apparatus and method for reproducing recording medium, and digital pll circuit
CN101039117A (en) * 2007-02-16 2007-09-19 中国科学院武汉物理与数学研究所 Rubidium atom frequency scale digital phase-locking frequency doubler
CN102820887A (en) * 2011-06-08 2012-12-12 美国亚德诺半导体公司 Hybrid digital-analog phase locked loops
CN103427836A (en) * 2013-07-25 2013-12-04 京东方科技集团股份有限公司 Frequency signal generation system and display device
CN104759349A (en) * 2015-03-23 2015-07-08 河北师范大学 A device of eliminating fog and thick haze by utilization of large-power microwave electromagnetic waves

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Application publication date: 20160420