CN106788265B - Oscillation circuit and 3D tester - Google Patents
Oscillation circuit and 3D tester Download PDFInfo
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- CN106788265B CN106788265B CN201611175246.8A CN201611175246A CN106788265B CN 106788265 B CN106788265 B CN 106788265B CN 201611175246 A CN201611175246 A CN 201611175246A CN 106788265 B CN106788265 B CN 106788265B
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- 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
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1231—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more bipolar transistors
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- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Oscillators With Electromechanical Resonators (AREA)
Abstract
The invention discloses an oscillating circuit which is characterized by comprising a working power supply input end, a self-excited oscillating circuit unit, a cross negative feedback circuit unit and an oscillating signal output end, wherein the working power supply input end is connected with the self-excited oscillating circuit unit; the working power supply input end is used for providing working power supply voltage for the oscillating circuit; the self-oscillation circuit unit is used for generating an oscillation signal; the cross negative feedback circuit unit is used for performing cross negative feedback control on the self-oscillation circuit unit so as to stabilize the frequency of the oscillation signal generated by the self-oscillation circuit unit; the oscillation signal output end is used for outputting the oscillation signal generated by the self-oscillation circuit unit. The invention also discloses a 3D tester. The oscillating circuit can stabilize the frequency of the oscillating signal generated by the self-excited oscillating circuit unit; in addition, the oscillating circuit of the invention has the advantage of simple structure.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to an oscillating circuit and a 3D tester.
Background
When the 3D tester carries out the 3D test, all need use self-excited oscillation circuit, however, among the prior art, self-excited oscillation circuit in the 3D tester can not output the oscillating signal of stable frequency, and its oscillating signal that outputs shakes great to can't satisfy the test demand of 3D tester.
Disclosure of Invention
The invention mainly aims to provide an oscillating circuit, aiming at solving the problem that an oscillating signal with stable frequency cannot be output.
In order to achieve the above object, the present invention provides an oscillation circuit including a working power supply input terminal, a self-excited oscillation circuit unit, a cross negative feedback circuit unit, and an oscillation signal output terminal; wherein:
the working power supply input end is used for providing working power supply voltage for the oscillating circuit;
the self-oscillation circuit unit is used for generating an oscillation signal;
the cross negative feedback circuit unit is used for performing cross negative feedback control on the self-excited oscillation circuit unit so as to stabilize the frequency of the oscillation signal;
and the oscillation signal output end is used for outputting the oscillation signal.
Preferably, a power supply terminal of the self-oscillation circuit unit is connected to the working power supply input terminal, a first feedback voltage signal output terminal of the self-oscillation circuit unit is connected to a first input terminal of the cross negative feedback circuit unit, a second feedback voltage signal output terminal of the self-oscillation circuit unit is connected to a second input terminal of the cross negative feedback circuit unit, the first feedback voltage signal input terminal of the self-oscillation circuit unit is connected to a first output terminal of the cross negative feedback circuit unit, the second feedback voltage signal input terminal of the self-oscillation circuit unit is connected to a second output terminal of the cross negative feedback circuit unit, and the output terminal of the self-oscillation circuit unit is connected to the oscillation signal output terminal.
Preferably, the cross negative feedback circuit unit includes a first resistor, a second resistor, a first capacitor and a second capacitor; wherein:
the first end of the first resistor is respectively connected with the first end of the first capacitor and the first feedback voltage signal output end of the self-oscillation circuit unit, and the second end of the first resistor is grounded; the second end of the first capacitor is connected with a first feedback voltage signal input end of the self-oscillation circuit unit; the first end of the second resistor is respectively connected with the first end of the second capacitor and the second feedback voltage signal output end of the self-oscillation circuit unit, and the second end of the second resistor is grounded; and the second end of the second capacitor is connected with the second feedback voltage signal input end of the self-oscillation circuit unit.
Preferably, the self-oscillation circuit unit includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a third capacitor, a fourth capacitor, a first NPN transistor, and a second NPN transistor; wherein:
the first end of the third resistor, the first end of the fourth resistor, the first end of the fifth resistor and the first end of the sixth resistor are all connected with the input end of the working power supply,
a second end of the third resistor is connected to a first end of the third capacitor and a collector of the first NPN transistor,
a second end of the fourth resistor is respectively connected with a second end of the third capacitor, a base of the second NPN triode and a first output end of the cross negative feedback circuit unit,
a second end of the fifth resistor is respectively connected with a first end of the fourth capacitor, a base electrode of the first NPN triode and a second output end of the cross negative feedback circuit unit;
a second end of the sixth resistor is connected with a second end of the fourth capacitor and a collector of the second NPN triode respectively;
and the collector of the second NPN triode is also connected with the oscillation signal output end.
Preferably, the oscillation circuit further includes a seventh resistor, a first end of the seventh resistor is connected to a collector of the second NPN transistor, and a second end of the seventh resistor is connected to the oscillation signal output terminal.
Preferably, the resistance value of the first resistor is less than or equal to 5% of the resistance value of the third resistor, and the resistance value of the second resistor is less than or equal to 5% of the resistance value of the sixth resistor.
Preferably, the capacitance value of the first capacitor is smaller than or equal to the capacitance value of the third capacitor, and the capacitance value of the second capacitor is smaller than or equal to the capacitance value of the fourth capacitor.
Preferably, the resistance value of the first resistor is equal to the resistance value of the second resistor, the resistance value of the third resistor is equal to the resistance value of the sixth resistor, and the resistance value of the fourth resistor is equal to the resistance value of the fifth resistor.
Preferably, the capacitance value of the first capacitor is equal to the capacitance value of the second capacitor, and the capacitance value of the third capacitor is equal to the capacitance value of the fourth capacitor.
In addition, in order to achieve the above object, the present invention also provides a 3D tester including the oscillation circuit as described above.
The invention provides an oscillating circuit, which comprises a working power supply input end, a self-excited oscillation circuit unit, a crossed negative feedback circuit unit and an oscillating signal output end, wherein the working power supply input end is connected with the self-excited oscillation circuit unit; the working power supply input end is used for providing working power supply voltage for the oscillating circuit; the self-oscillation circuit unit is used for generating an oscillation signal; the cross negative feedback circuit unit is used for performing cross negative feedback control on the self-excited oscillation circuit unit so as to stabilize the frequency of the oscillation signal; the oscillation signal output end is used for outputting the oscillation signal. The oscillating circuit is provided with the cross negative feedback circuit unit, and the cross negative feedback circuit unit can perform cross negative feedback control on the self-excited oscillating circuit unit, so that the frequency of the oscillating signal generated by the self-excited oscillating circuit unit is more stable; meanwhile, the oscillating circuit of the invention also has the advantages of simple structure and easy realization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic block diagram of an oscillation circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an oscillation circuit according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The present invention provides an oscillating circuit, referring to fig. 1, fig. 1 is a schematic block diagram of an oscillating circuit according to an embodiment of the present invention, in this embodiment, fig. 1 is a schematic block diagram of an oscillating circuit according to an embodiment of the present invention, and the schematic block diagram of an oscillating circuit according to an embodiment of the present invention includes a working power input terminal 101, a self-excited oscillating circuit unit 102, a cross negative feedback circuit unit 103, and an oscillating signal output terminal 104.
Specifically, in this embodiment, the working power supply input terminal 101 is configured to provide a working power supply voltage for the oscillating circuit of this embodiment;
the self-oscillation circuit unit 102 is configured to generate an oscillation signal;
the cross negative feedback circuit unit 103 is configured to perform cross negative feedback control on the self-oscillation circuit unit 102 to stabilize the frequency of the oscillation signal generated by the self-oscillation circuit unit 102;
the oscillation signal output terminal 104 is configured to output the oscillation signal.
In this embodiment, the power supply terminal of the self-oscillation circuit unit 102 is connected to the operating power supply input terminal 101, the first feedback voltage signal output terminal of the self-oscillation circuit unit 102 is connected to the first input terminal of the cross negative feedback circuit unit 103, the second feedback voltage signal output terminal of the self-oscillation circuit unit 102 is connected to the second input terminal of the cross negative feedback circuit unit 103, the first feedback voltage signal input terminal of the self-oscillation circuit unit 102 is connected to the first output terminal of the cross negative feedback circuit unit 103, the second feedback voltage signal input terminal of the self-oscillation circuit unit 102 is connected to the second output terminal of the cross negative feedback circuit unit 103, and the output terminal of the self-oscillation circuit unit 102 is connected to the oscillation signal output terminal 104.
Fig. 2 is a schematic circuit diagram of an oscillation circuit according to an embodiment of the present invention, and referring to fig. 1 and fig. 2 together, in this embodiment, the cross negative feedback circuit unit 103 includes a first resistor R1, a second resistor R2, a first capacitor C1, and a second capacitor C2.
Specifically, a first end of the first resistor R1 is a first input end of the cross negative feedback circuit unit 103, a first end of the first resistor R1 is connected with a first feedback voltage signal output end of the self-oscillation circuit unit 102, and a first end of the first resistor R1 is further connected with a first end of the first capacitor C1; a second end of the first resistor R1 is grounded; a second terminal of the first capacitor C1 is a first output terminal of the cross negative feedback circuit unit 103, and a second terminal of the first capacitor C1 is connected with a first feedback voltage signal input terminal of the self-oscillation circuit unit 102; the first end of the second resistor R2 is a second input end of the cross negative feedback circuit unit 103, the first end of the second resistor R2 is connected with a second feedback voltage signal output end of the self-oscillation circuit unit 102, the first end of the second resistor R2 is also connected with the first end of the second capacitor C2, and the second end of the second resistor R2 is grounded; a second terminal of the second capacitor C2 is a second output terminal of the cross negative feedback circuit unit 103, and a second terminal of the second capacitor C2 is connected to a second feedback voltage signal input terminal of the self-oscillation circuit unit 102.
In this embodiment, the self-oscillation circuit unit 102 includes a third resistor R3, a fourth resistor T4, a fifth resistor R5, a sixth resistor T6, a third capacitor C3, a fourth capacitor C4, a first NPN transistor Q1, and a second NPN transistor Q2.
Specifically, the first end of the third resistor R3, the first end of the fourth resistor R4, the first end of the fifth resistor R5 and the first end of the sixth resistor R6 are all power supply terminals of the self-oscillation circuit unit 102, and the first end of the third resistor R3, the first end of the fourth resistor R4, the first end of the fifth resistor R5 and the first end of the sixth resistor R6 are all connected to the working power supply input terminal; a second end of the third resistor R3 is connected to the first end of the third capacitor C3 and the collector of the first NPN transistor Q1, respectively, and a second end of the fourth resistor R4 is connected to the second end of the third capacitor C3, the base of the second NPN transistor Q2, and the first output end of the cross negative feedback circuit unit 103 (i.e., the second end of the first capacitor C1); a second end of the fifth resistor R5 is respectively connected to the first end of the fourth capacitor C4, the base of the first NPN transistor Q1, and the second output end of the cross negative feedback circuit unit 103 (i.e., the second end of the second capacitor C2); a second end of the sixth resistor R6 is connected to a second end of the fourth capacitor C4 and a collector of the second NPN transistor Q2, respectively;
in this embodiment, the emitter of the first NPN transistor Q1 is the first feedback voltage signal output terminal of the self-oscillation circuit unit 102, and the emitter of the first NPN transistor Q1 is connected to the first input terminal of the cross negative feedback circuit unit 103, that is, the emitter of the first NPN transistor Q1 is connected to the first terminal of the first resistor R1 in the cross negative feedback circuit unit 103; an emitter of the second NPN transistor Q1 is a second feedback voltage signal output terminal of the self-oscillation circuit unit 102, and an emitter of the second NPN transistor Q2 is connected to a second input terminal of the cross negative feedback circuit unit 103, i.e., an emitter of the second NPN transistor Q2 is connected to a first terminal of the second resistor R2 in the cross negative feedback circuit unit 103;
in this embodiment, the second terminal of the third capacitor C3 is the first feedback voltage signal input terminal of the self-oscillation circuit unit 102, and the second terminal of the third capacitor C3 is connected to the first output terminal of the cross negative feedback circuit unit 103, i.e. the second terminal of the third capacitor C3 is connected to the second terminal of the first capacitor C1 in the cross negative feedback circuit unit 103;
in this embodiment, the first terminal of the fourth capacitor C4 is the second feedback voltage signal input terminal of the self-oscillation circuit unit 102, and the first terminal of the fourth capacitor C4 is connected to the second output terminal of the cross negative feedback circuit unit 103, i.e. the first terminal of the fourth capacitor C4 is connected to the second terminal of the second capacitor C2 in the cross negative feedback circuit unit 103;
further, in this embodiment, a seventh resistor R7 is further connected between the collector of the second NPN transistor Q2 and the oscillation signal output terminal 104. Specifically, a first end of the seventh resistor R7 is connected to the collector of the second NPN transistor Q2, and a second end of the seventh resistor R7 is connected to the oscillation signal output terminal 104.
Further, in this embodiment, since the cross negative feedback circuit unit 103 both ensures that the oscillation operation of the self-oscillation circuit unit 102 is performed smoothly and stabilizes the frequency of the oscillation signal generated by the self-oscillation circuit unit 102, in this embodiment, the resistance of the first resistor R1 is smaller than the resistance of the third resistor R3, and the resistance of the second resistor R2 is smaller than the resistance of the sixth resistor R6. Preferably, in this embodiment, the resistance of the first resistor R1 is less than or equal to 5% of the resistance of the third resistor R3, and the resistance of the second resistor R2 is less than or equal to 5% of the resistance of the sixth resistor R6.
Further, in this embodiment, the capacitance of the first capacitor C1 is less than or equal to the capacitance of the third capacitor C3, and the capacitance of the second capacitor C2 is less than or equal to the capacitance of the fourth capacitor C4.
Further, in this embodiment, the resistance of the first resistor R1 is equal to the resistance of the second resistor R2, the resistance of the third resistor R3 is equal to the resistance of the sixth resistor R6, and the resistance of the fourth resistor R4 is equal to the resistance of the fifth resistor R5.
Further, in the present embodiment, the capacitance of the first capacitor C1 is equal to the capacitance of the second capacitor C2, and the capacitance of the third capacitor C3 is equal to the capacitance of the fourth capacitor C4.
In addition, in order to ensure the normal operation of the self-oscillation circuit unit 102 (i.e. to ensure that the first NPN transistor Q1 and the second NPN transistor Q2 both operate in the amplification state), in this embodiment, the resistances of the third resistor R3 connected to the collector of the first NPN transistor Q1 and the sixth resistor R6 connected to the collector of the second NPN transistor Q2 cannot be too large.
The operation principle of the oscillating circuit of the present embodiment is specifically described as follows: when the voltage of the collector of the first NPN transistor Q1 becomes high, the high voltage is transmitted to the emitter of the first NPN transistor Q1 through the third capacitor C3 and the first capacitor C1 in the cross negative feedback circuit unit 103, and at this time, the cross negative feedback circuit unit 103 blocks the rise of the collector voltage of the first NPN transistor Q1 due to the negative feedback function of the cross negative feedback circuit unit 103; similarly, when the voltage of the collector of the second NPN transistor Q2 becomes high, the high voltage is transmitted to the emitter of the second NPN transistor Q2 through the fourth capacitor C4 and the second capacitor C2 in the cross negative feedback circuit unit 103, and at this time, the cross negative feedback circuit unit 103 blocks the rise of the collector voltage of the second NPN transistor Q2 due to the negative feedback function of the cross negative feedback circuit unit 103, so that the cross negative feedback circuit unit 103 in this embodiment functions to stabilize the frequency of the oscillation signal output by the self-oscillation circuit unit 102. In addition, in this embodiment, since the resistance of the third resistor R3 connected to the collector of the first NPN transistor Q1 and the resistance of the sixth resistor R6 connected to the collector of the second NPN transistor Q2 are both small, the negative feedback effect of the cross negative feedback circuit unit 103 in this embodiment does not cause the self-oscillation circuit unit 102 to stop oscillation.
Since the oscillation circuit of this embodiment is provided with the cross negative feedback circuit unit 103, the cross negative feedback circuit unit 103 can perform cross negative feedback control on the self-oscillation circuit unit 102, so that the frequency of the oscillation signal generated by the self-oscillation circuit unit 102 is more stable; meanwhile, the oscillating circuit of the embodiment also has the advantages of simple structure and easy realization.
The invention further provides a 3D tester, which includes an oscillation circuit, and the structure of the oscillation circuit can refer to the above embodiment, and it should be understood that, since the 3D tester of the embodiment adopts the technical scheme of the oscillation circuit, the 3D tester has all the beneficial effects of the oscillation circuit.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. An oscillating circuit is characterized by comprising a working power supply input end, a self-excited oscillating circuit unit, a crossed negative feedback circuit unit and an oscillating signal output end; wherein:
the working power supply input end is used for providing working power supply voltage for the oscillating circuit;
the self-oscillation circuit unit is used for generating an oscillation signal;
the cross negative feedback circuit unit is used for performing cross negative feedback control on the self-excited oscillation circuit unit so as to stabilize the frequency of the oscillation signal;
the oscillation signal output end is used for outputting the oscillation signal;
the cross negative feedback circuit unit comprises a first resistor, a second resistor, a first capacitor and a second capacitor; wherein:
the first end of the first resistor is respectively connected with the first end of the first capacitor and the first feedback voltage signal output end of the self-oscillation circuit unit, and the second end of the first resistor is grounded; the second end of the first capacitor is connected with a first feedback voltage signal input end of the self-oscillation circuit unit; the first end of the second resistor is respectively connected with the first end of the second capacitor and the second feedback voltage signal output end of the self-oscillation circuit unit, and the second end of the second resistor is grounded; and the second end of the second capacitor is connected with the second feedback voltage signal input end of the self-oscillation circuit unit.
2. The oscillation circuit according to claim 1, wherein a power supply terminal of the self-oscillation circuit unit is connected to the operating power supply input terminal, a first feedback voltage signal output terminal of the self-oscillation circuit unit is connected to a first input terminal of the cross negative feedback circuit unit, a second feedback voltage signal output terminal of the self-oscillation circuit unit is connected to a second input terminal of the cross negative feedback circuit unit, the first feedback voltage signal input terminal of the self-oscillation circuit unit is connected to a first output terminal of the cross negative feedback circuit unit, the second feedback voltage signal input terminal of the self-oscillation circuit unit is connected to a second output terminal of the cross negative feedback circuit unit, and the output terminal of the self-oscillation circuit unit is connected to the oscillation signal output terminal.
3. The oscillating circuit according to claim 1, wherein the self-oscillation circuit unit includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a third capacitor, a fourth capacitor, a first NPN transistor, and a second NPN transistor; wherein:
the first end of the third resistor, the first end of the fourth resistor, the first end of the fifth resistor and the first end of the sixth resistor are all connected with the input end of the working power supply,
a second end of the third resistor is connected to a first end of the third capacitor and a collector of the first NPN transistor,
a second end of the fourth resistor is respectively connected with a second end of the third capacitor, a base of the second NPN triode and a first output end of the cross negative feedback circuit unit,
a second end of the fifth resistor is respectively connected with a first end of the fourth capacitor, a base electrode of the first NPN triode and a second output end of the cross negative feedback circuit unit;
a second end of the sixth resistor is connected with a second end of the fourth capacitor and a collector of the second NPN triode respectively;
and the collector of the second NPN triode is also connected with the oscillation signal output end.
4. The oscillating circuit of claim 3, further comprising a seventh resistor, a first terminal of the seventh resistor being coupled to the collector of the second NPN transistor, and a second terminal of the seventh resistor being coupled to the oscillating signal output terminal.
5. The oscillating circuit according to claim 3, wherein the resistance value of the first resistor is less than or equal to 5% of the resistance value of the third resistor, and the resistance value of the second resistor is less than or equal to 5% of the resistance value of the sixth resistor.
6. The oscillating circuit of claim 3, wherein the capacitance value of the first capacitor is less than or equal to the capacitance value of the third capacitor, and the capacitance value of the second capacitor is less than or equal to the capacitance value of the fourth capacitor.
7. The oscillation circuit according to any one of claims 3 to 6, wherein a resistance value of the first resistor is equal to a resistance value of the second resistor, a resistance value of the third resistor is equal to a resistance value of the sixth resistor, and a resistance value of the fourth resistor is equal to a resistance value of the fifth resistor.
8. The oscillation circuit according to any one of claims 3 to 6, wherein a capacitance value of the first capacitor is equal to a capacitance value of the second capacitor, and a capacitance value of the third capacitor is equal to a capacitance value of the fourth capacitor.
9. A 3D tester, characterized in that the 3D tester comprises an oscillating circuit according to any of claims 1 to 8.
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| CN201611175246.8A CN106788265B (en) | 2016-12-15 | 2016-12-15 | Oscillation circuit and 3D tester |
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| CN201611175246.8A CN106788265B (en) | 2016-12-15 | 2016-12-15 | Oscillation circuit and 3D tester |
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| US2857512A (en) * | 1953-03-20 | 1958-10-21 | Rca Corp | Monostable multivibrator |
| GB916994A (en) * | 1960-01-14 | 1963-01-30 | Atomic Energy Authority Uk | Relaxation oscillator |
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