CN103308785A - Crystal oscillation detection circuit and crystal oscillation detection device - Google Patents
Crystal oscillation detection circuit and crystal oscillation detection device Download PDFInfo
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- CN103308785A CN103308785A CN2012100575476A CN201210057547A CN103308785A CN 103308785 A CN103308785 A CN 103308785A CN 2012100575476 A CN2012100575476 A CN 2012100575476A CN 201210057547 A CN201210057547 A CN 201210057547A CN 103308785 A CN103308785 A CN 103308785A
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- crystal oscillator
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Abstract
A crystal oscillator detection circuit comprises an oscillation generation unit, a detection unit and an indication unit, wherein the oscillation generation unit is provided with a crystal oscillation accessing end and is used for accessing crystal oscillation to generate an oscillation signal, the detection unit is connected with an output end of the oscillation generation unit and is used for picking up and rectifying the oscillation signal, and the indication unit is connected with an output end of the detection unit and is used for indicating whether crystal oscillation starts. According to the crystal oscillator detection circuit, when crystal oscillation starts normally, the detection unit detects an oscillation signal generated by the oscillation generation unit, rectifies the oscillation signal into a direct-current signal and outputs the direct-current signal to the indication unit, and the indication unit indicates that crystal oscillation is normal; and when crystal oscillation cannot start normally, the oscillation generation unit cannot generate an oscillation signal, the detection unit has no output, and the indication unit has no indication. The crystal oscillation detection circuit can be used for controlling to indicate whether crystal oscillation is normal or not just by using the low-cost detection unit and is low in cost and high in detection efficiency compared with a method in which detection is carried out by using an oscilloscope.
Description
[technical field]
The present invention relates to the electron device detection range, particularly relate to a kind of crystal oscillator testing circuit and crystal oscillator pick-up unit.
[background technology]
Usually, electron device soldered or experimentize before, need to detect its quality, and when detecting crystal oscillator components and parts quality, usually use special-purpose oscillograph to detect, but oscillograph is expensive and also be unfavorable for carrying, so just there is the high and low problem of detection efficiency of cost.
[summary of the invention]
Based on this, there is the high and low problem of detection efficiency of cost at using multimeter to detect the crystal oscillator components and parts, be necessary to provide the crystal oscillator that a kind of cost is low, detection efficiency is high testing circuit.
A kind of crystal oscillator testing circuit comprises:
The vibration generating unit, has the crystal oscillator incoming end, be used for inserting crystal oscillator and produce oscillator signal, comprise switching tube, first resistance, second resistance, first electric capacity, second electric capacity and power supply, first end of described switching tube connects the positive pole of described power supply, second end of described switching tube connects an end of described second resistance, the other end of described second resistance connects the negative pole of described power supply, connect first resistance between first end of described switching tube and the control end, first electric capacity and second electric capacity successively are connected in series between the negative pole of described control end of switching tube and described power supply, the node of described first electric capacity and second electric capacity links to each other with second end of described switching tube, described control end of switching tube is an incoming end that is connected with crystal oscillator one end, second electric capacity is another incoming end that is connected with the crystal oscillator other end with the node of second resistance, and second end of switching tube is the output terminal of described vibration generating unit;
Detection unit is connected with the output terminal of described vibration generating unit, picks up described oscillator signal and rectification;
Indicating member is connected with the output terminal of described detection unit, is used to indicate whether starting of oscillation of crystal oscillator.
Further, described switching tube is the NPN triode, and the collector of described triode connects the positive pole of described power supply, and the emitter of described triode connects described second resistance.
Further, described detection unit comprises filter capacitor, commutation diode and voltage stabilizing diode, described filter capacitor connects second end of described switching tube and the anode of commutation diode respectively, the negative electrode of described commutation diode is the output terminal of detection unit, the negative electrode of described voltage stabilizing diode connects the anode of described commutation diode, and the anode of described voltage stabilizing diode connects the negative pole of described power supply.
Further, described indicating member is light emitting diode, and the anode of described light emitting diode connects the negative electrode of described commutation diode, and the negative electrode of described light emitting diode connects the negative pole of described power supply.
Further, the switch that between the positive pole of first end of described switching tube and described power supply, also is connected in series.
In addition, the present invention also provides a kind of crystal oscillator pick-up unit that comprises above-mentioned crystal oscillator testing circuit, comprise the circuit board that embeds above-mentioned crystal oscillator testing circuit, the main part of ccontaining described circuit board, be arranged at the holding section that can arbitrarily plug crystal oscillator to be measured on the described main part, be positioned at the power pack of described main part, and be arranged on and be series at the switch in the power-supplying circuit on the described circuit board on the main part.
Further, described holding section comprises the many groups of clamp structures that can arbitrarily plug a plurality of crystal oscillators to be measured, and described circuit board comprises a plurality of above-mentioned crystal oscillator testing circuits.
Further, described clamp structure is at least two metal clips that are used for holding crystal oscillator to be measured two ends.
Above-mentioned crystal oscillator testing circuit, when the normal starting of oscillation of crystal oscillator, the oscillator signal that detection unit produces the vibration generating unit detects and oscillator signal is rectified into direct current signal, and detection unit is exported to indicating member to direct current signal, and the indication crystal oscillator is normal; When crystal oscillator normally during starting of oscillation, the vibration generating unit can not send oscillator signal, so the detection unit no-output, and indicating member does not have indication.This crystal oscillator testing circuit only use detection unit cheaply can control the indication crystal oscillator normally whether, to compare cost low with the mode of using oscillograph to detect, simultaneously the detection efficiency height.
[description of drawings]
Fig. 1 is the modular structure figure of the crystal oscillator testing circuit of an embodiment;
Fig. 2 is the circuit theory diagrams of the crystal oscillator testing circuit crystal oscillator testing circuit of an embodiment;
Fig. 3 is the crystal oscillator pick-up unit of an embodiment.
[embodiment]
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is described in more detail.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
Crystal oscillator is widely used in the electronic applications, crystal oscillator starting of oscillation direct relation entire circuit whether in circuit.Therefore be necessary to carry out crystal oscillator and detect before the crystal oscillator place in circuit or before circuit test, whether the test crystal oscillator can starting of oscillation.
As shown in Figure 1, the crystal oscillator testing circuit that present embodiment provides comprises vibration generating unit 100, detection unit 200 and indicating member 300.
As shown in Figure 2, vibration generating unit 100 has crystal oscillator U1 incoming end, is used for inserting crystal oscillator U1 and produces oscillator signal.In the present embodiment, vibration generating unit 100 comprises switching tube Q1, first resistance R 1, second resistance R 2, first capacitor C 1, second capacitor C 2 and power supply BT1.First end of switching tube Q1 connects the positive pole of power supply BT1, second end of switching tube Q1 connects an end of second resistance R 2, the other end of second resistance R 2 connects the negative pole of power supply BT1, connect first resistance R 1 between first end of switching tube Q1 and the control end, first capacitor C 1 that is connected in series successively between the negative pole of the control end of switching tube Q1 and power supply BT1 and second capacitor C 2, the node of first capacitor C 1 and second capacitor C 2 links to each other with second end of switching tube Q1, the control end of switching tube Q1 is an incoming end X1 who is connected with crystal oscillator U1 one end, second capacitor C 2 is another incoming end X2 that is connected with the crystal oscillator U1 other end with the node of second resistance R 2, and second end of switching tube Q1 is the output terminal of vibration generating unit 100.
Crystal oscillator U1 has an important parameters, and that is exactly the load capacitance value, selects the shunt capacitance equate with the load capacitance value, just can obtain the resonance frequency of crystal oscillator nominal.So preferred, first capacitor C 1 and second capacitor C 2 are tunable capacitor, make the equivalent capacity after first capacitor C 1 and second capacitor C 2 are connected equal the load capacitance value.It will form antiresonant circuit to be appreciated that electric capacity suitable in the two ends parallel connection of crystal oscillator U1, antiresonant circuit is added in the negative-feedback circuit just can constitute sine wave oscillation circuit again.Certainly, vibration generating unit 100 also can be made of the vibration generating unit of oscillator signals such as square wave, sine wave, sawtooth wave crystal oscillator and other elements.
In the present embodiment, switching tube Q1 is the NPN triode, and the collector of described triode connects the positive pole of power supply BT1, and the emitter of triode connects second resistance R 2, and switching tube Q1 can also adopt the transistor of other types certainly.
Indicating member 300 is connected with the output terminal of detection unit 200, is used to indicate whether starting of oscillation of crystal oscillator U1.In the present embodiment, indicating member 300 is LED, and the anode of LED connects the output terminal of detection unit 200, i.e. the negative electrode of commutation diode D1, and the negative electrode of LED connects the negative pole of power supply BT1 in the vibration generating unit 100.Be appreciated that indicating member 300 also can be the indicating device by the driving of direct current signal such as hummer.
In a preferred embodiment, the switch S 1 that also is connected in series between the positive pole of first end of switching tube Q1 and power supply BT1.Switch S 1 is externally powered in order to control power supply BT1, when needs detect crystal oscillator U1, just opens switch S 1.When not detecting crystal oscillator U1, switch S 1 disconnects, and just not externally power supply of power supply BT1 like this is beneficial to maintenance and the protection of power supply BT1.
In addition, as shown in Figure 3, the present invention also provides a kind of crystal oscillator pick-up unit 1 that comprises above-mentioned crystal oscillator testing circuit, comprise the circuit board 11 that embeds above-mentioned crystal oscillator testing circuit, the main part 12 of ccontaining circuit board, be arranged at the holding section 13 that can arbitrarily plug crystal oscillator to be measured on the main part 12, be positioned at the power pack 14 of main part 12, and be arranged on and be series at the switch in the power-supplying circuit 15 on the circuit board on the main part 12.In a preferred embodiment, holding section 13 comprises the many groups of clamp structures that can arbitrarily plug a plurality of crystal oscillators to be measured, circuit board 11 comprises a plurality of above-mentioned crystal oscillator testing circuits, be appreciated that, at this moment, the above-mentioned switch 15 that is arranged on main part 12 corresponds to a plurality of, the corresponding crystal oscillator testing circuit of each switch 15 control, certainly, a plurality of crystal oscillator testing circuit also can adopt a master switch.Each crystal oscillator to be measured inserts the crystal oscillator testing circuit by clamp structure.The clamp structure here can be appreciated that in order reaching better to hold effect for two metal clips 131 that are used for holding crystal oscillator to be measured two ends, can to increase the metal clips that holds crystal oscillator to be measured.The crystal oscillator pick-up unit 1 here can also pass through above preferred embodiment except detecting whether starting of oscillation to independent crystal oscillator, simultaneously a plurality of crystal oscillators is detected whether starting of oscillation, and the quality of handled easily personal identification element is increased work efficiency.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (8)
1. a crystal oscillator testing circuit is characterized in that, comprising:
The vibration generating unit, has the crystal oscillator incoming end, be used for inserting crystal oscillator and produce oscillator signal, comprise switching tube, first resistance, second resistance, first electric capacity, second electric capacity and power supply, first end of described switching tube connects the positive pole of described power supply, second end of described switching tube connects an end of described second resistance, the other end of described second resistance connects the negative pole of described power supply, connect first resistance between first end of described switching tube and the control end, first electric capacity and second electric capacity successively are connected in series between the negative pole of described control end of switching tube and described power supply, the node of described first electric capacity and second electric capacity links to each other with second end of described switching tube, described control end of switching tube is an incoming end that is connected with crystal oscillator one end, second electric capacity is another incoming end that is connected with the crystal oscillator other end with the node of second resistance, and second end of switching tube is the output terminal of described vibration generating unit;
Detection unit is connected with the output terminal of described vibration generating unit, picks up described oscillator signal and rectification;
Indicating member is connected with the output terminal of described detection unit, is used to indicate whether starting of oscillation of crystal oscillator.
2. crystal oscillator testing circuit according to claim 1 is characterized in that, described switching tube is the NPN triode, and the collector of described triode connects the positive pole of described power supply, and the emitter of described triode connects described second resistance.
3. crystal oscillator testing circuit according to claim 2, it is characterized in that, described detection unit comprises filter capacitor, commutation diode and voltage stabilizing diode, described filter capacitor connects second end of described switching tube and the anode of commutation diode respectively, the negative electrode of described commutation diode is the output terminal of detection unit, the negative electrode of described voltage stabilizing diode connects the anode of described commutation diode, and the anode of described voltage stabilizing diode connects the negative pole of described power supply.
4. crystal oscillator testing circuit according to claim 1 is characterized in that, described indicating member is light emitting diode, and the anode of described light emitting diode connects the negative electrode of described commutation diode, and the negative electrode of described light emitting diode connects the negative pole of described power supply.
5. according to any described crystal oscillator testing circuit of claim 1～4, it is characterized in that switch also is connected in series between the positive pole of first end of described switching tube and described power supply.
6. crystal oscillator pick-up unit, it is characterized in that, comprise the circuit board that embeds any described crystal oscillator testing circuit of claim 1～5, the main part of ccontaining described circuit board, be arranged at the holding section that can arbitrarily plug crystal oscillator to be measured on the described main part, be positioned at the power pack of described main part, and be arranged on and be series at the switch in the power-supplying circuit on the described circuit board on the main part.
7. crystal oscillator pick-up unit according to claim 6 is characterized in that, described holding section comprises the many groups of clamp structures that can arbitrarily plug a plurality of crystal oscillators to be measured, and described circuit board comprises a plurality of described crystal oscillator testing circuits.
8. crystal oscillator pick-up unit according to claim 7 is characterized in that, described clamp structure is at least two metal clips that are used for holding crystal oscillator to be measured two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100575476A CN103308785A (en) | 2012-03-06 | 2012-03-06 | Crystal oscillation detection circuit and crystal oscillation detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100575476A CN103308785A (en) | 2012-03-06 | 2012-03-06 | Crystal oscillation detection circuit and crystal oscillation detection device |
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| CN103308785A true CN103308785A (en) | 2013-09-18 |
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| CN2012100575476A Pending CN103308785A (en) | 2012-03-06 | 2012-03-06 | Crystal oscillation detection circuit and crystal oscillation detection device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103645431A (en) * | 2013-12-28 | 2014-03-19 | 黄月华 | Quartz crystal oscillator performance test device |
| CN108414869A (en) * | 2018-06-11 | 2018-08-17 | 南京尤尼泰信息科技有限公司 | A kind of test system suitable for plurality of specifications crystal oscillator |
| CN109490738A (en) * | 2018-11-05 | 2019-03-19 | 南京中电熊猫晶体科技有限公司 | A kind of measuring device of crystal oscillator diode characteristic |
| CN114019342A (en) * | 2022-01-05 | 2022-02-08 | 深圳佑驾创新科技有限公司 | Passive crystal oscillator test circuit |
| CN114689964A (en) * | 2022-02-28 | 2022-07-01 | 惠州金百泽物联科技有限公司 | Circuit design, test and adjustment method for starting stability of crystal oscillator |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103645431A (en) * | 2013-12-28 | 2014-03-19 | 黄月华 | Quartz crystal oscillator performance test device |
| CN108414869A (en) * | 2018-06-11 | 2018-08-17 | 南京尤尼泰信息科技有限公司 | A kind of test system suitable for plurality of specifications crystal oscillator |
| CN108414869B (en) * | 2018-06-11 | 2023-09-29 | 南京尤尼泰信息科技有限公司 | Test system suitable for multiple specification crystal oscillator |
| CN109490738A (en) * | 2018-11-05 | 2019-03-19 | 南京中电熊猫晶体科技有限公司 | A kind of measuring device of crystal oscillator diode characteristic |
| CN114019342A (en) * | 2022-01-05 | 2022-02-08 | 深圳佑驾创新科技有限公司 | Passive crystal oscillator test circuit |
| CN114019342B (en) * | 2022-01-05 | 2022-04-05 | 深圳佑驾创新科技有限公司 | Passive crystal oscillator test circuit |
| CN114689964A (en) * | 2022-02-28 | 2022-07-01 | 惠州金百泽物联科技有限公司 | Circuit design, test and adjustment method for starting stability of crystal oscillator |
| CN114689964B (en) * | 2022-02-28 | 2023-11-24 | 深圳市造物工场科技有限公司 | Crystal oscillator starting stability testing circuit, testing and adjusting method |
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