CN100578245C - Oscillator detecting fixture - Google Patents
Oscillator detecting fixture Download PDFInfo
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- CN100578245C CN100578245C CN200610125650A CN200610125650A CN100578245C CN 100578245 C CN100578245 C CN 100578245C CN 200610125650 A CN200610125650 A CN 200610125650A CN 200610125650 A CN200610125650 A CN 200610125650A CN 100578245 C CN100578245 C CN 100578245C
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Abstract
The present invention is about providing a kind of oscillator detecting fixture, and it includes oscillation control circuit, frequency down circuit and display circuit.Wherein, oscillation control circuit is in order to the oscillator signal of output oscillator, and frequency down circuit is connected to the output of oscillation control circuit.Frequency down circuit has the electric capacity and the resistance that can discharge and recharge, in order to adjust the time constant of oscillator signal.In addition, display circuit is connected to frequency down circuit, in order to show the output signal of frequency down circuit.The testing staff can be by some element of observing display circuit, and whether the flicker situation of for example observing the light emitting diode of display circuit decides oscillator normal.
Description
Technical field
The present invention is about a kind of detection tool, especially a kind of detection tool that is used to detect oscillator.
Background technology
See also Fig. 1, be a kind of method flow diagram of measurement quartz (controlled) oscillator of prior art.In the method for the measurement oscillator of this prior art, at first, in step S110, quartz (controlled) oscillator to be measured is positioned on the monitor station.Next, in step S120, power supply unit and oscillograph are connected to quartz (controlled) oscillator to be measured.Afterwards, in step S130, make power supply unit out-put supply signal to quartz (controlled) oscillator to be measured.Then, in step S140, adjust oscillograph.At last, in step S150, the waveform that observation oscilloscope captured is to determine whether quartz (controlled) oscillator to be measured is up to specification.
Yet, whether breaking down accurately though use power supply unit collocation oscillograph to detect oscillator, the price of instruments such as power supply unit and oscillograph is not low, and the cost of the detection method of this existent technique of old friend is too high.So, be necessary to design a kind of cost of saving and can accurately detect the detection tool whether oscillator breaks down again.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of oscillator detecting fixture is provided, whether it can effectively and easily detect the oscillator fault under situation about not using as expensive device such as oscillograph and power supply units.And the characteristic that the present invention's oscillator detecting fixture has lightly and do not take up space, easy to use with carry.
Technical essential of the present invention is: a kind of oscillator detecting fixture, it comprises: oscillation control circuit, frequency down circuit and display circuit.Wherein, oscillation control circuit is in order to the oscillator signal of output oscillator, and frequency down circuit is connected to the output of oscillation control circuit.Frequency down circuit has the electric capacity and the resistance that can discharge and recharge, in order to adjust the time constant of oscillator signal.Simultaneously, display circuit is connected to frequency down circuit, in order to show the output signal of frequency down circuit.
In one embodiment of the invention, oscillation control circuit has rejection gate, and a connecting pin of rejection gate input end is connected to oscillator, and another connecting pin is connected to a reference voltage source.In addition, oscillator detecting fixture also has the switch that is connected between reference voltage source and earth terminal.And frequency down circuit has first rejection gate and second rejection gate, and electric capacity is connected between the input end of the output terminal of first rejection gate and second rejection gate, and resistance serial connection reference voltage source is to electric capacity simultaneously.In addition, the output terminal of second rejection gate feedback is connected in a connecting pin of an input end of first rejection gate, and another connecting pin of the first rejection gate input end then is connected to the output of oscillation control circuit.
Frequency down circuit of the present invention has the protecting component that is serially connected with between electric capacity and the reference voltage source, and wherein protecting component can be diode.In addition, oscillator detecting fixture also comprises frequency eliminating circuit and power supply changeover device.Wherein, frequency eliminating circuit is connected between display unit and the frequency down circuit.And power supply changeover device is connected to oscillation control circuit, frequency down circuit and display circuit respectively, with output reference voltage.Simultaneously, display circuit has light emitting diode, and the negative electrode of light emitting diode is connected to the output of frequency eliminating circuit, and its anode then is connected to reference voltage source.
By aforesaid explanation as can be known, the oscillator signal that the present invention's oscillator detecting fixture will be exported by oscillation control circuit inputs to frequency eliminating circuit and frequency down circuit, and comes the driven for emitting lights diode with consequential signal.Thereby the tester only needs can judge by observing the situation that flickers of driven for emitting lights diode whether oscillator breaks down.
Description of drawings
Fig. 1 is a kind of method flow diagram of measurement quartz (controlled) oscillator of prior art.
Fig. 2 is the circuit block diagram of the present invention's oscillator detecting fixture.
Fig. 3 A is the circuit diagram of the present invention's oscillation control circuit.
Fig. 3 B is the circuit diagram of the present invention's frequency down circuit.
Fig. 3 C is the circuit diagram of the present invention's display circuit.
Embodiment
Now, oscillator detecting fixture of the present invention is described in further detail in conjunction with Figure of description.
Please refer to Fig. 2, it is the circuit block diagram of the present invention's oscillator detecting fixture.The present invention's oscillator detecting fixture 200 comprises power supply changeover device 210, oscillation control circuit 220, frequency down circuit 230, frequency eliminating circuit 240 and display circuit 250.Wherein, power supply changeover device 210 provides reference voltage VDC to oscillation control circuit 220, frequency down circuit 230, frequency eliminating circuit 240 with display circuit 250.The oscillator signal So of oscillation control circuit 220 output oscillators 124 to be measured (as shown in Figure 3A), and frequency down circuit 230 is connected to the output of oscillation control circuit 220, receiving oscillator signal So, and its frequency reducing is produced oscillator signal So '.In addition, frequency eliminating circuit 240 is connected between frequency down circuit 230 and the display circuit 250, to receive oscillator signal So ' and make its frequency elimination and produce oscillator signal So ".Display circuit 250 is connected to frequency eliminating circuit 240 and receives oscillator signal So ", to show corresponding to oscillator signal So " circuit operation, the flicker situation of light emitting diode for example.
On the other hand, if the demand of the frequency reducing ability coincidence detection of frequency down circuit 230, also can omit frequency eliminating circuit 240, and directly display circuit 250 is connected to frequency down circuit 230, with direct reception oscillator signal So ', and show circuit operation corresponding to oscillator signal So '.
Please also refer to Fig. 2 and Fig. 3 A, wherein Fig. 3 A is the circuit diagram of oscillation control circuit of the present invention.Oscillation control circuit 220 has rejection gate 222, and a connecting pin of rejection gate 222 input ends is connected to oscillator 224 to be measured, and another connecting pin is connected to power supply changeover device 210 via resistance R 2, to receive reference voltage VDC.Wherein, oscillation control circuit 220 output oscillation frequency So, its frequency is equal to the oscillation frequency of oscillator 224 to be measured.In addition, oscillator detecting fixture 200 also has the switch 226 between resistance R of being connected in 2 and earth terminal.
Well known, only when input signal was all the accurate position of low logic, its output signal just was the accurate position of high logic to rejection gate 222.When pressing switch 226, this moment, the input end of the rejection gate 222 that is connected with resistance R 2 was the accurate position of low logic, so when the waveform that is produced at oscillator 224 to be measured is lower than the accurate position of logic, rejection gate 222 will be exported the oscillator signal So of high logic standard.Otherwise when the waveform that is produced at oscillator 224 to be measured is higher than the accurate position of high logic, rejection gate 222 will export the oscillator signal So of accurate of low logic.
Please also refer to Fig. 2 and Fig. 3 B, wherein Fig. 3 B is the detailed circuit diagram of the present invention's frequency down circuit.Frequency down circuit 230 can be with oscillator signal So frequency reducing with outputting oscillation signal So ', and frequency down circuit 230 has the capacitor C 2 and resistance R 4 that can discharge and recharge again, and the two is in order to adjust the time constant of oscillator signal So.And frequency down circuit 230 has rejection gate 232,234, and wherein, capacitor C 2 is connected between the input end of output terminal AND 234 of rejection gate 232, and the reference voltage of resistance R 4 serial connection power supply changeover devices 110 is to capacitor C 2 simultaneously.In addition, the output terminal of rejection gate 234 feedback is connected in a connecting pin of rejection gate 232 input ends, and another connecting pin of rejection gate 232 input ends is connected to the output of oscillation control circuit 220.In one embodiment of the invention, more particularly, frequency down circuit 230 has the protection assembly between capacitor C of being serially connected with 2 and the power supply changeover device 210, and wherein this protection assembly can be diode D2.
More particularly, after 132 frequency reducings of oscillator signal So process rejection gate, the accurate alternate signal Sv in position of output height logic, signal Sv can determine the state that capacitor C 2 discharges and recharges.And capacitor C 2 and the long-pending frequency that can determine the oscillator signal So ' that rejection gate 232 is exported of multiplying each other of resistance R 4, capacitor C 2 and resistance R 4 multiply each other long-pending big more, then the frequency of oscillator signal So ' is more little.Otherwise, capacitor C 2 and resistance R 4 multiply each other long-pending more little, then the frequency of oscillator signal So ' is big more.In addition, diode D2 promptly is used for protection frequency down circuit 230 when power supply changeover device 210 output surgings, avoids frequency down circuit 230 to be subjected to interference and injury from the surging of power supply changeover device 210.
In addition, if the frequency reducing scarce capacity of above-mentioned frequency down circuit 230 then is provided with frequency eliminating circuit 240, with oscillation frequency So ' frequency elimination, for example with oscillation frequency So ' divided by two, and with the oscillation frequency So of gained behind the frequency elimination ", export display circuit 250 to.
Please also refer to Fig. 2 and Fig. 3 C, wherein Fig. 3 C is the detailed circuit diagram of display circuit of the present invention.Display circuit 250 has light emitting diode 242, and the negative electrode of light emitting diode 242 connects the oscillator signal So that frequency eliminating circuit 240 is exported ", and its anode connects power supply changeover device 210 via resistance R 6.More particularly, as oscillator signal So " when being lower than the voltage quasi position of reference voltage VDC, will have electric current I 2 to flow through light emitting diode 242, make that light emitting diode 242 is luminous.On the other hand, when oscillator signal So ' is higher than the voltage quasi position of reference voltage VDC, no current is flow through light emitting diode 242, make light emitting diode 242 not work.Because of oscillator signal So " be that the accurate bit interleaving of high and low logic ground occurs; so light emitting diode 242 can show oscillator signal So " change in voltage and the phenomenon that occurs glimmering, the tester can by observe light emitting diode 242 flickers evenly whether, decide the oscillator to be measured 224 among Fig. 3 A whether normal.
In sum, please refer to Fig. 2, in the present invention's oscillator detecting fixture 200, because of adopting frequency down circuit 230 and frequency eliminating circuit 240, so that the frequency of the oscillator signal So that oscillation control circuit 220 is produced descends, and the oscillator signal So that this frequency is descended " deliver to light emitting diode 242, make light emitting diode 242 produce the distinguishable scintillation of human eyes, judge by this whether oscillator to be measured 224 is normal.For example: script is 4MHz by the frequency of the oscillator signal So that oscillation control circuit 220 is produced, but behind frequency down circuit 230 and frequency eliminating circuit 240, the frequency that inputs to light emitting diode 242 is 13Hz, under 13Hz, the tester only need make to detect by an unaided eye and can judge just whether oscillator to be measured 224 is normal.
Claims (9)
1, a kind of oscillator detecting fixture comprises:
One is used for the oscillation control circuit of outputting oscillation signal;
One frequency down circuit, connect the output of this oscillation control circuit, this frequency down circuit has the electric capacity and a resistance that can discharge and recharge, can be in order to adjust the time constant of this oscillator signal, this frequency down circuit has first rejection gate and second rejection gate, this electric capacity is connected between the input end of the output terminal of this first rejection gate and this second rejection gate, and this resistance is connected in series a reference voltage source to this electric capacity; And
One display circuit connects this frequency down circuit, in order to show the output signal of this frequency down circuit.
2, as claim 1 a described oscillator detecting fixture, wherein this oscillation control circuit has a rejection gate, and a connecting pin of this rejection gate input end is connected to oscillator, and another connecting pin is connected to a reference voltage source.
3, as claim 2 a described oscillator detecting fixture, further comprise a switch, it is connected between this reference voltage source and the earth terminal.
4, as claim 1 a described oscillator detecting fixture, wherein the output terminal of this second rejection gate feedback is connected to a connecting pin of this first rejection gate input end, and another connecting pin of the first rejection gate input end then is connected to the output of this oscillation control circuit.
5, as claim 1 a described oscillator detecting fixture, wherein this frequency down circuit has a protecting component, is serially connected with between this electric capacity and this reference voltage source.
6, as claim 5 a described oscillator detecting fixture, wherein this protecting component is a diode.
7, as claim 1 a described oscillator detecting fixture, further comprise a frequency eliminating circuit, it is connected between this display unit and this frequency down circuit.
8, as claim 7 a described oscillator detecting fixture, wherein this display circuit has a light emitting diode, and the negative electrode of this light emitting diode connects the output of this frequency eliminating circuit, and anode is connected to a power supply changeover device.
9, as claim 1 a described oscillator detecting fixture, further comprise a power supply changeover device, it connects this oscillation control circuit, this frequency down circuit and this display circuit respectively, in order to export a reference voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610125650A CN100578245C (en) | 2006-08-25 | 2006-08-25 | Oscillator detecting fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610125650A CN100578245C (en) | 2006-08-25 | 2006-08-25 | Oscillator detecting fixture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101131412A CN101131412A (en) | 2008-02-27 |
| CN100578245C true CN100578245C (en) | 2010-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200610125650A Active CN100578245C (en) | 2006-08-25 | 2006-08-25 | Oscillator detecting fixture |
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| CN (1) | CN100578245C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160037656A (en) * | 2014-09-29 | 2016-04-06 | 삼성전자주식회사 | Error detector and method for detecting error of oscillator |
| CN110361590A (en) * | 2019-07-19 | 2019-10-22 | 广东浪潮大数据研究有限公司 | A kind of clock pulses wave arrangement for detecting |
| CN113674665B (en) * | 2021-08-05 | 2024-06-11 | 昆山工研院新型平板显示技术中心有限公司 | Display driving circuit and electronic apparatus |
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| CN101131412A (en) | 2008-02-27 |
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