CN204256577U - Voltage attenuation type modulate circuit - Google Patents
Voltage attenuation type modulate circuit Download PDFInfo
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- CN204256577U CN204256577U CN201420695024.9U CN201420695024U CN204256577U CN 204256577 U CN204256577 U CN 204256577U CN 201420695024 U CN201420695024 U CN 201420695024U CN 204256577 U CN204256577 U CN 204256577U
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- resistance
- operational amplifier
- amplifier
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- voltage
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Abstract
The utility model discloses voltage attenuation type modulate circuit, comprise operational amplifier A, resistance R1, resistance R2, resistance R3 and electric capacity C, described resistance R1 one end Bonding pressure sensor, the input end in the same way of other end concatenation operation amplifier A; The output terminal of the reverse input end concatenation operation amplifier A of described operational amplifier A, at output terminal also contact resistance R2 and the analog-digital converter successively of operational amplifier A, operational amplifier A also connects 5V power supply; The common port of described resistance R3 one end contact resistance R2 and analog-digital converter, the earth terminal of the other end concatenation operation amplifier A of resistance R3, the also shunt capacitance C at the two ends of resistance R3.The utility model, by above-mentioned principle, by increasing input impedance, is offset with pressure transducer output impedance, then at the output stage of amplifier divider resistance in parallel, utilize less device, realize the voltage of stable output, measurement result is more accurate.
Description
Technical field
The utility model relates to sea water advanced fields of measurement modulate circuit, is specifically related to voltage attenuation type modulate circuit.
Background technology
The degree of depth of ocean is an important parameter of ocean water body.Know the degree of depth of ocean, the beaching that just can prevent sea from navigating by water, to hit a submerged reef.Submarine is when seabed is movable, and it is searched to avoid that the Measuring Oceanic degree of depth can utilize submarine topography to make barrier, the noise that the signal reception instrument of the other side can be made to can not receive submarine send.It can thus be appreciated that the degree of depth measuring seawater is extremely important.Need to use pressure transducer in seawater measuring process, and be 2.5v for the reference voltage measured used by sea water advanced device other electron component, and the output voltage of pressure transducer is greater than reference voltage.Thus must decay to pressure transducer output voltage, to reach the coupling with reference voltage.Realizing the simplest method of this function is directly carry out dividing potential drop with two resistance, but because sensor has certain output impedance, direct coupling divider resistance is equivalent to sensor output impedance and this two resistor coupled in parallel, and the sampled voltage of input A/D can be caused inaccurate.Make to measure sea water advanced device output voltage comparatively large with temperature fluctuation, affect the accuracy of measurement result.
Utility model content
The utility model overcomes the deficiencies in the prior art, provides voltage attenuation type modulate circuit, by increasing input impedance, offset with pressure transducer output impedance, then at the output stage of amplifier divider resistance in parallel, utilize less device, realize the voltage of stable output, measurement result is more accurate.
For solving above-mentioned technical matters, the utility model is by the following technical solutions: voltage attenuation type modulate circuit, comprise operational amplifier A, resistance R1, resistance R2, resistance R3 and electric capacity C, described resistance R1 one end Bonding pressure sensor, the input end in the same way of other end concatenation operation amplifier A; The output terminal of the reverse input end concatenation operation amplifier A of described operational amplifier A, at output terminal also contact resistance R2 and the analog-digital converter successively of operational amplifier A, operational amplifier A also connects 5V power supply; The common port of described resistance R3 one end contact resistance R2 and analog-digital converter, the earth terminal of the other end concatenation operation amplifier A of resistance R3, the also shunt capacitance C at the two ends of resistance R3.One-level operational amplifier A is added after pressure transducer institute connecting resistance R1 exports, the reverse input end of operational amplifier A is allowed to be connected with output terminal, form a voltage follower, realize input impedance high, output impedance is low, thus offset with pressure transducer output impedance, then after the output stage of amplifier divider resistance in parallel, to realize stable output signal after voltage attenuation and sea water advanced equipment use is measured in supply after being treated to digital signal by analog to digital converter.This circuit to arrange output voltage more stable, not easily fluctuate, and reduce the number of device, reduce and account for plate area.
Described operational amplifier A is single supply rail-to-rail input/output operation amplifier, and model is OPA340.The operating voltage of OPA340 can be low to moderate 2.5V, and its minimum of permission is input as-500mV, and the highest being input as can higher than power supply 500mV, and amplification effect is better.
The resistance of described resistance R1 and resistance R2 is equal.
The resistance of described resistance R3 is 9/10 times of resistance R2 resistance.The impedance that further reduction pressure transducer exports, on the impact of circuit, exports more stable voltage.
Compared with prior art, the beneficial effects of the utility model are:
1, after pressure transducer institute connecting resistance R1 exports, one-level operational amplifier A is added, allow the reverse input end of operational amplifier A be connected with output terminal, form a voltage follower, realize input impedance high, output impedance is low, thus offset with pressure transducer output impedance, then after the output stage of amplifier divider resistance in parallel voltage, realize the decay of voltage, make output voltage more stable, not easily fluctuate, and reduce the number of device, reduce and account for plate area.
2, operational amplifier A is single supply rail-to-rail input/output operation amplifier, and model is OPA340, and amplification effect is better.
3, the resistance of resistance R3 is 9/10 times of resistance R2 resistance, and the impedance reducing pressure transducer output further, on the impact of circuit, exports more stable voltage.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Be further elaborated the utility model below in conjunction with accompanying drawing, embodiment of the present utility model is not limited thereto.
Embodiment 1:
As shown in Figure 1, the utility model comprises operational amplifier A, resistance R1 size is 10 kilo-ohms, resistance R2 size is 10 kilo-ohms, resistance R3 be 9 kilo-ohms and electric capacity C is 1000 pico farads, described resistance R1 one end Bonding pressure sensor, the input end in the same way of other end concatenation operation amplifier A; The output terminal of the reverse input end concatenation operation amplifier A of described operational amplifier A, at output terminal also contact resistance R2 and the analog-digital converter successively of operational amplifier A, operational amplifier A also connects 5V power supply; The common port of described resistance R3 one end contact resistance R2 and analog-digital converter, the earth terminal of the other end concatenation operation amplifier A of resistance R3, the also shunt capacitance C at the two ends of resistance R3.
Pressure transducer is by outside supply power, one-level operational amplifier A is added after pressure transducer institute connecting resistance R1 exports, the reverse input end of operational amplifier A is allowed to be connected with output terminal, form a voltage follower, realize input impedance high, output impedance is low, thus offset with pressure transducer output impedance, again after the output stage of amplifier divider resistance R3 in parallel, output voltage becomes the voltage at parallel resistance R2 and resistance R3 two ends, realize the decay of voltage, after finally decaying, voltage exports, and this voltage stabilization not easily produces fluctuation, after being treated to digital signal finally by analog to digital converter, sea water advanced equipment use is measured in supply.This circuit to arrange output voltage more stable, not easily fluctuate, and reduce the number of device, reduce and account for plate area.
Embodiment 2:
The present embodiment is preferably as follows on the basis of embodiment 1: operational amplifier A is single supply rail-to-rail input/output operation amplifier, and model is OPA340.The operating voltage of OPA340 can be low to moderate 2.5V, and its minimum of permission is input as-500mV, and the highest being input as can higher than power supply 500mV, and amplification effect is better.
The resistance of described resistance R1 and resistance R2 is equal.
The resistance of described resistance R3 is 9/10 times of resistance R2 resistance.The impedance that further reduction pressure transducer exports, on the impact of circuit, exports more stable voltage.
Just this utility model can be realized as mentioned above.
Claims (4)
1. voltage attenuation type modulate circuit, is characterized in that: comprise operational amplifier A, resistance R1, resistance R2, resistance R3 and electric capacity C, described resistance R1 one end Bonding pressure sensor, the input end in the same way of other end concatenation operation amplifier A; The output terminal of the reverse input end concatenation operation amplifier A of described operational amplifier A, at output terminal also contact resistance R2 and the analog-digital converter successively of operational amplifier A, operational amplifier A also connects 5V power supply; The common port of described resistance R3 one end contact resistance R2 and analog-digital converter, the earth terminal of the other end concatenation operation amplifier A of resistance R3, the also shunt capacitance C at the two ends of resistance R3.
2. voltage attenuation type modulate circuit according to claim 1, is characterized in that: described operational amplifier A is single supply rail-to-rail input/output operation amplifier, and model is OPA340.
3. voltage attenuation type modulate circuit according to claim 1, is characterized in that: the resistance of described resistance R1 and resistance R2 is equal.
4. voltage attenuation type modulate circuit according to claim 3, is characterized in that: the resistance of described resistance R3 is 9/10 times of resistance R2 resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420695024.9U CN204256577U (en) | 2014-11-19 | 2014-11-19 | Voltage attenuation type modulate circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420695024.9U CN204256577U (en) | 2014-11-19 | 2014-11-19 | Voltage attenuation type modulate circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204256577U true CN204256577U (en) | 2015-04-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420695024.9U Expired - Fee Related CN204256577U (en) | 2014-11-19 | 2014-11-19 | Voltage attenuation type modulate circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN204256577U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104503525A (en) * | 2014-11-19 | 2015-04-08 | 成都嵌智捷科技有限公司 | Voltage attenuation conditioning circuit insusceptible to interference |
-
2014
- 2014-11-19 CN CN201420695024.9U patent/CN204256577U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104503525A (en) * | 2014-11-19 | 2015-04-08 | 成都嵌智捷科技有限公司 | Voltage attenuation conditioning circuit insusceptible to interference |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150408 Termination date: 20151119 |
|
| EXPY | Termination of patent right or utility model |