CN208572038U - A kind of oscillator fixed amplitude circuit - Google Patents
A kind of oscillator fixed amplitude circuit Download PDFInfo
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- CN208572038U CN208572038U CN201821322403.8U CN201821322403U CN208572038U CN 208572038 U CN208572038 U CN 208572038U CN 201821322403 U CN201821322403 U CN 201821322403U CN 208572038 U CN208572038 U CN 208572038U
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Abstract
The utility model relates to a kind of oscillator fixed amplitude circuits, based on oscillator circuit structure, introduce novel fixed amplitude circuit structure, pass through the introducing of the 5th resistance R5, thermistor R6, the 7th resistance R7, construct completely new circuit structure, by realizing the stabilization of entire circuit gain, and then realize the stabilization of oscillation amplitude.
Description
Technical field
The utility model relates to a kind of oscillator fixed amplitude circuits, belong to oscillator technique field.
Background technique
Wen-bridge oscillator requires frequency stabilization as waveform generator in, and oscillation amplitude is constant, as shown in Figure 1, existing
In some RC wien bridge oscillators, R1, C1 series connection, R3, C2 are in parallel, and circuit constitutes positive feedback branch, and play frequency-selecting and make
With the elements such as R4, RT1, R2 and diode constitute negative-feedback and fixed ampllitude condition.Adjusting RT1 can change negative feedback depth, with full
The size of output amplitude also can be changed in a certain range in the amplitude condition vibrated enough；Utilize two anti-parallel diodes
The nonlinear characteristic of D1, D2 forward resistance realizes fixed ampllitude, and the access of R2 is the influence in order to slacken diode, improves waveform and loses
Very.In practical applications, due to the difference of use environment, influence of the temperature to its output amplitude is bigger, two two poles of fixed ampllitude
Pipe D1, D2, after temperature rising, conducting internal resistance changes, and declines circuit gain, eventually leads to oscillation amplitude variation.
Utility model content
The technical problem to be solved by the utility model is to provide one kind to be based on existing oscillator circuit structure, introduces novel
Fixed amplitude circuit structure can effectively realize the oscillator fixed amplitude circuit of fixed ampllitude application effect.
In order to solve the above-mentioned technical problem the utility model uses following technical scheme: the utility model devises a kind of vibration
Swing device fixed amplitude circuit, including first resistor R1, second resistance R2,3rd resistor R3, the 5th resistance R5, thermistor R6, the 7th
Resistance R7, first capacitor C1, the second capacitor C2, diode D1, diode D2, slide rheostat RT1, transport and placing device A1；
Wherein, be in parallel connection between thermistor R6 and the 7th resistance R7, between thermistor R6 and the 7th resistance R7
Wherein abut each other end and wherein one end of the 5th resistance R5 of side are connected to each other；Transport and placing device A1 access power supply positive voltage VCC and
Power negative voltage VEE；The other end of 5th resistance R5 respectively on the negative input of transport and placing device A1, slide rheostat RT1 its
In a resistance value fixing end be connected；The electrode input end of transport and placing device A1 respectively with wherein one end of the second capacitor C2,3rd resistor
Wherein one end of R3, wherein one end of first resistor R1 are connected；The other end of second capacitor C2 is another with 3rd resistor R3's
End is connected, and is grounded；The other end of first resistor R1 is connected with wherein one end of first capacitor C1, and first capacitor C1's is another
One end respectively with the anode of diode D1, wherein one end of second resistance R2, the cathode of diode D2, transport and placing device A1 output end
It is connected；The cathode of diode D1, the other end of second resistance R2, diode D2 positive three be connected to each other, and the docking point
Respectively on slide rheostat RT1 sliding end and another resistance value fixing end be connected.
A kind of optimal technical scheme as the utility model: the thermistor R6 is the temperature-sensitive electricity of negative temperature coefficient
Resistance.
A kind of oscillator fixed amplitude circuit described in the utility model compared with the prior art by using the above technical solution, have with
Lower technical effect: oscillator fixed amplitude circuit designed by the utility model is based on oscillator circuit structure, introduces novel fixed amplitude circuit
Structure by realizing the stabilization of entire circuit gain, and then realizes the stabilization of oscillation amplitude.
Detailed description of the invention
Fig. 1 is the schematic diagram of existing oscillator fixed amplitude circuit；
Fig. 2 is the schematic diagram of the utility model design oscillator fixed amplitude circuit.
Specific embodiment
Specific embodiment of the present utility model is described in further detail with reference to the accompanying drawings of the specification.
Based on the research to existing RC wien bridge oscillator shown in Fig. 1, if finding RT1 therein, R2 and diode
D1, D2 regard a resistance RL as, then, the gain of entire circuit is just related with the ratio of RL and R4, if temperature rises, RL
Be reduced by, circuit gain just drops, to make entire circuit gain constant, just must R4 also reduce simultaneously.
Based on above-mentioned discovery, as shown in Fig. 2, the utility model devises a kind of oscillator fixed amplitude circuit, including the first electricity
Hinder R1, second resistance R2,3rd resistor R3, the 5th resistance R5, thermistor R6, the 7th resistance R7, first capacitor C1, the second electricity
Hold C2, diode D1, diode D2, slide rheostat RT1, transport and placing device A1.
Wherein, be in parallel connection between thermistor R6 and the 7th resistance R7, between thermistor R6 and the 7th resistance R7
Wherein abut each other end and wherein one end of the 5th resistance R5 of side are connected to each other；In practical application, thermistor R6 is subzero temperature
Spend the thermistor of coefficient；Transport and placing device A1 access power supply positive voltage VCC and power supply negative voltage VEE；The other end of 5th resistance R5
Respectively with wherein a resistance value fixing end is connected on the negative input of transport and placing device A1, slide rheostat RT1；Transport and placing device A1 is just
Pole input terminal respectively with wherein one end of the second capacitor C2, wherein one end of 3rd resistor R3, first resistor R1 wherein one end
It is connected；The other end of second capacitor C2 is connected with the other end of 3rd resistor R3, and is grounded；The other end of first resistor R1
Be connected with wherein one end of first capacitor C1, the other end of first capacitor C1 respectively with the anode of diode D1, second resistance
Wherein one end of R2, the cathode of diode D2, transport and placing device A1 output end be connected；Cathode, the second resistance R2 of diode D1
The other end, diode D2 positive three be connected to each other, and the docking point respectively on slide rheostat RT1 sliding end, with
And another resistance value fixing end is connected.
Above-mentioned designed oscillator fixed amplitude circuit is applied in reality, oscillator circuit structure is based on, introduces novel
Fixed amplitude circuit structure replaces the 4th original resistance using the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 institute's structure structure
R4, and by the 7th resistance R7, compensate the rate of change of thermistor R6.When the temperature is changed, diode D1, diode D2,
After temperature rising, conducting internal resistance reduces, while the 6th resistance R6 thermistor resistance value also reduces, the 5th resistance R5, the 6th electricity
The ratio for hindering R6, the 7th resistance R7 institute's structure structure and R4 is constant, that is, stabilizes entire circuit gain, also just stabilize oscillation width
Degree.
The embodiments of the present invention is explained in detail above in conjunction with attached drawing, but the utility model is not limited to
Above embodiment can also not depart from the utility model within the knowledge of a person skilled in the art
It is made a variety of changes under the premise of objective.
Claims (2)
1. a kind of oscillator fixed amplitude circuit, it is characterised in that: including first resistor R1, second resistance R2,3rd resistor R3, the 5th
Resistance R5, thermistor R6, the 7th resistance R7, first capacitor C1, the second capacitor C2, diode D1, diode D2, sliding variable resistance
Device RT1, transport and placing device A1；
Wherein, be in parallel connection between thermistor R6 and the 7th resistance R7, between thermistor R6 and the 7th resistance R7 wherein
Abut each other end and wherein one end of the 5th resistance R5 of side are connected to each other；Transport and placing device A1 access power supply positive voltage VCC and power supply
Negative voltage VEE；The other end of 5th resistance R5 is respectively on the negative input of transport and placing device A1, slide rheostat RT1 wherein one
Resistance value fixing end is connected；The electrode input end of transport and placing device A1 respectively with wherein one end of the second capacitor C2,3rd resistor R3
Wherein one end, first resistor R1 wherein one end be connected；The other end phase of the other end of second capacitor C2 and 3rd resistor R3
Connection, and be grounded；The other end of first resistor R1 is connected with wherein one end of first capacitor C1, the other end of first capacitor C1
It is connected respectively with the output end of the anode of diode D1, wherein one end of second resistance R2, the cathode of diode D2, transport and placing device A1
It connects；The cathode of diode D1, the other end of second resistance R2, diode D2 positive three be connected to each other, and the docking point distinguish
With on slide rheostat RT1 sliding end and another resistance value fixing end be connected.
2. a kind of oscillator fixed amplitude circuit according to claim 1, it is characterised in that: the thermistor R6 is negative temperature system
Several thermistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821322403.8U CN208572038U (en) | 2018-08-16 | 2018-08-16 | A kind of oscillator fixed amplitude circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821322403.8U CN208572038U (en) | 2018-08-16 | 2018-08-16 | A kind of oscillator fixed amplitude circuit |
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| CN208572038U true CN208572038U (en) | 2019-03-01 |
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| CN201821322403.8U Active CN208572038U (en) | 2018-08-16 | 2018-08-16 | A kind of oscillator fixed amplitude circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542796A (en) * | 2019-06-26 | 2019-12-06 | 南京理工大学 | simple device for measuring electrolytic capacitor and ESR |
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2018
- 2018-08-16 CN CN201821322403.8U patent/CN208572038U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542796A (en) * | 2019-06-26 | 2019-12-06 | 南京理工大学 | simple device for measuring electrolytic capacitor and ESR |
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