CN209264037U - Dual power supply digital-control amplifier circuit - Google Patents
Dual power supply digital-control amplifier circuit Download PDFInfo
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- CN209264037U CN209264037U CN201920155485.XU CN201920155485U CN209264037U CN 209264037 U CN209264037 U CN 209264037U CN 201920155485 U CN201920155485 U CN 201920155485U CN 209264037 U CN209264037 U CN 209264037U
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Abstract
The utility model discloses a kind of dual power supply digital-control amplifier circuits, including single supply digital regulation resistance RT and amplifier unit OP；The external main control chip of digital interface of the single supply digital regulation resistance RT；Second source end V- is connected after power supply terminal VDD connection the first power end V+ of the single supply digital regulation resistance RT, one R1 of ground terminal VSS connection resistance；The single supply digital regulation resistance RT is used as the gain setting resistor of amplifier unit OP, and the end potentiometer A and the end potentiometer B are all connected with the gain adjustment input terminal of amplifier unit OP, and the end potentiometer W connects the end potentiometer B.The dual power supply digital-control amplifier circuit of the utility model, the circuit structure of optimization design enables single supply digital regulation resistance to amplify suitable for dual power supply system to zero cross signal, the voltage amplification gain of the circuit is adjustable in 6~1000 ranges, reduces at least 50% compared to traditional DAC scheme or dual power supply digital regulation resistance scheme cost.
Description
Technical field
The utility model relates to ultrasonic meter technical fields, and in particular to a kind of dual power supply digital-control amplifier circuit
Background technique
Ultrasonic wave gas meter be it is a kind of using ultrasonic wave in gas time and tide the time difference come measure gas flow rate and stream
The instrument of amount.Compared with traditional leather diaphragm type gas meter, ultrasonic wave gas meter have it is small in size, crushing is small, feature with high accuracy, stream
Signal acquisition all electronic, no mechanical part abrasion are measured, therefore service life is also longer.Compared to ultrasonic liquid flow meter,
The sensor echo signal amplitude of ultrasonic wave gas meter is small, needs to amplify signal.And with the operating condition of gas meter, working medium and make
Amplitude variation range with the difference of environment, echo-signal is larger, and therefore, it is necessary to the gains to signal amplifier to carry out dynamic
Adjustment.Scheme more common at present is that the gain of signal amplifier is controlled using DAC or digital regulation resistance.But it is most of
The system that application scheme only supports single supply to power.Under the system for the negative and positive dual power power supply for needing to amplify zero cross signal, then
It needs to need to increase many costs using more complicated scheme or using the control component for supporting negative and positive dual power power supply.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of low cost, high-gain, based on the number of negative and positive dual power
Control amplifier circuit, the voltage amplification gain of the circuit is adjustable in 6~1000 ranges, compared to traditional DAC scheme or
Dual power supply digital regulation resistance scheme cost reduces at least 50%.
In order to solve the above-mentioned technical problem, the utility model provides a kind of dual power supply digital-control amplifier circuit, including list
Power supply digital regulation resistance RT and amplifier unit OP；The external main control chip of digital interface of the single supply digital regulation resistance RT；
Power supply terminal VDD connection the first power end V+ of the single supply digital regulation resistance RT, one R1 of ground terminal VSS connection resistance
Second source end V- is connected afterwards；The single supply digital regulation resistance RT is used as the gain setting resistor of amplifier unit OP, electricity
The position end device A and the end potentiometer B are all connected with the gain adjustment input terminal of amplifier unit OP, the end potentiometer W connect the end potentiometer A or
Person connects the end potentiometer B.
It further comprise that the first power supply terminal of the amplifier unit OP connects in one preferred embodiment of the utility model
The first power end V+ is met, second source terminal connects second source end V-；It includes one OP1 of operational amplifier, operational amplifier
Three OP3 of two OP2 and operational amplifier；
The positive input of one OP1 of operational amplifier connects input terminal VIN, and reverse input end connects the end potentiometer A,
The reverse input end of output end connection three OP3 of operational amplifier；Its output end connects its reversed input after being also connected with two R2 of resistance
End；
The positive input of two OP2 of operational amplifier connects input terminal VIN, and reverse input end connects the end potentiometer B,
The positive input of output end connection three OP3 of operational amplifier；Its output end connects its reversed input after being also connected with two R2 of resistance
End；
The output end of three OP3 of operational amplifier is the output end vo ut of amplifier unit OP.
It further comprise the amplifier unit OP further include three R3 of resistance in one preferred embodiment of the utility model；
The reverse input end of three OP3 of operational amplifier is connected to after output end connection three R3 of resistance of one OP1 of operational amplifier；Operation is put
The positive input of three OP3 of operational amplifier is connected to after output end connection three R3 of resistance of two OP2 of big device；Operational amplifier three
Its reverse input end is connected to after output end connection three R3 of resistance of OP3.
It further comprise the single supply digital regulation resistance RT logical for band number in one preferred embodiment of the utility model
The CMOS single supply digital regulation resistance of SPI interface is interrogated, operating voltage range is 2.5V~5.5V.
In one preferred embodiment of the utility model, further comprise one R1 of resistance resistance value be 1K Ω~100K
Ω。
The utility model has the beneficial effects that the dual power supply digital-control amplifier circuit of the utility model, the circuit of optimization design
Structure enables single supply digital regulation resistance to amplify suitable for dual power supply system to zero cross signal, the circuit
Voltage amplification gain is adjustable in 6~1000 ranges, compared to traditional DAC scheme or dual power supply digital regulation resistance scheme at
This reduction at least 50%.
Detailed description of the invention
Fig. 1 is the circuit diagram of dual power supply digital-control amplifier circuit in the preferred embodiment in the utility model.
Specific embodiment
The utility model is described in further detail in the following with reference to the drawings and specific embodiments, so that those skilled in the art
The utility model may be better understood and can be practiced, but illustrated embodiment is not as the restriction to the utility model.
Embodiment
As shown in Figure 1, present embodiment discloses a kind of dual power supply digital-control amplifier circuit, including single supply digital regulation resistance
RT and amplifier unit OP；In the present embodiment technical solution, single supply digital regulation resistance RT single supply works, and operating voltage is
2.5V~5.5V.The digital regulation resistance that the circuit structure of the application optimization design enables single supply to work is suitable for dual power supply
Zero cross signal is amplified in power supply system, structure design are as follows:
The external main control chip of digital interface of above-mentioned single supply digital regulation resistance RT, digital interface part can be by master control cores
Strong pull-down when piece is by output low level obtains GND level, and (usual main control chip is defeated by strong pull-down when exporting low level
GND level out) and work normally single supply digital regulation resistance RT.The power supply terminal VDD of above-mentioned single supply digital regulation resistance RT
The first power end V+ is connected, connects second source end V- after one R1 of ground terminal VSS connection resistance；Above-mentioned single supply number electricity
Position device RT is used as the gain setting resistor of amplifier unit OP, and the end potentiometer A and the end potentiometer B are all connected with amplifier unit OP
Gain adjustment input terminal, the end potentiometer W connect the end potentiometer A or connection the end potentiometer B.
The single supply digital regulation resistance RT of the application is used as the gain setting resistor of amplifier unit OP, amplifier unit OP
Gain amplifier adjusted by single supply digital regulation resistance RT, entire circuit can be suitable for negative and positive dual power power, if only
When single supply being needed to power, second source end V- is directly grounded；When needing to amplify zero cross signal, powered using negative and positive dual power
When, second source end V- (i.e. negative power end) is connected after one R1 of ground terminal VSS connection resistance of single supply digital regulation resistance RT,
Electric current needed for adjusting port as amplifier unit OP is minimum, analog contacts (the i.e. potentiometer W of single supply digital regulation resistance RT
End) it can work in negative and positive dual power V+ and V-, so that the digital-control amplifier circuit of the application is using single supply number electricity
Under the premise of the device RT of position, zero cross signal can be detected suitable for the environment that negative and positive dual power is powered, compared to traditional side DAC
Case or dual power supply digital regulation resistance scheme cost reduce at least 50%.
The first power supply terminal of specific above-mentioned amplifier unit OP connects the first power end V+, the connection of second source terminal
Second source end V-；It includes one OP1 of operational amplifier, three R3 of two OP2 of operational amplifier, three OP3 of operational amplifier and resistance；
The positive input of one OP1 of operational amplifier connects input terminal VIN, and reverse input end connects the end potentiometer A,
The reverse input end of output end connection three OP3 of operational amplifier；Its output end connects its reversed input after being also connected with two R2 of resistance
End；
The positive input of two OP2 of operational amplifier connects input terminal VIN, and reverse input end connects the end potentiometer B,
The positive input of output end connection three OP3 of operational amplifier；Its output end connects its reversed input after being also connected with two R2 of resistance
End；
The output end of three OP3 of operational amplifier is the output end vo ut of amplifier unit OP；
The reversed input of three OP3 of operational amplifier is connected to after output end connection three R3 of resistance of one OP1 of operational amplifier
End；The positive input of three OP3 of operational amplifier is connected to after output end connection three R3 of resistance of two OP2 of operational amplifier；Fortune
Its reverse input end is connected to after calculating output end connection three R3 of resistance of three OP3 of amplifier.
The amplifier unit OP of the above structure, voltage amplification gain are
In the present embodiment technical solution, above-mentioned single supply digital regulation resistance RT is that the CMOS with digital communication SPI interface is mono-
Power supply digital regulation resistance, operating voltage range are 2.5V~5.5V.MCP41*** system can be selected according to actual needs
The integrated chip of the series such as column, MCP42*** series or MAX54** series.The resistance value of one R1 of resistance is 1K Ω~100K Ω.
The voltage amplification gain of entire circuit is adjustable in 6~1000 ranges.
Embodiment described above is only preferred embodiments for fully illustrating the utility model, the utility model
Protection scope it is without being limited thereto.Those skilled in the art made equivalent substitute or change on the basis of the utility model
It changes, both is within the protection scope of the present invention.The protection scope of the utility model is subject to claims.
Claims (5)
1. a kind of dual power supply digital-control amplifier circuit, it is characterised in that: including single supply digital regulation resistance (RT) and amplifier list
First (OP)；The external main control chip of digital interface of the single supply digital regulation resistance (RT)；The single supply digital regulation resistance
(RT) power supply terminal (VDD) connects the first power end (V+), and ground terminal (VSS) connection resistance one (R1) connects second afterwards
Power end (V-)；The single supply digital regulation resistance (RT) is used as the gain setting resistor of amplifier unit (OP), potentiometer A
End and the end potentiometer B are all connected with the gain adjustment input terminal of amplifier unit (OP), the end potentiometer W connect the end potentiometer A or
Connect the end potentiometer B.
2. dual power supply digital-control amplifier circuit as described in claim 1, it is characterised in that: the of the amplifier unit (OP)
One power supply terminal connects the first power end (V+), and second source terminal connects second source end (V-)；It includes operational amplifier
One (OP1), operational amplifier two (OP2) and operational amplifier three (OP3)；
The positive input of operational amplifier one (OP1) connects input terminal (VIN), and reverse input end connects the end potentiometer A,
Output end connects the reverse input end of operational amplifier three (OP3)；Its output end is also connected with resistance two (R2) and connects it afterwards reversely
Input terminal；
The positive input of operational amplifier two (OP2) connects input terminal (VIN), and reverse input end connects the end potentiometer B,
Output end connects the positive input of operational amplifier three (OP3)；Its output end is also connected with resistance two (R2) and connects it afterwards reversely
Input terminal；
The output end of operational amplifier three (OP3) is the output end (Vout) of amplifier unit (OP).
3. dual power supply digital-control amplifier circuit as claimed in claim 2, it is characterised in that: the amplifier unit (OP) is also wrapped
Include resistance three (R3)；Operational amplifier three (OP3) is connected to after output end connection resistance three (R3) of operational amplifier one (OP1)
Reverse input end；Operational amplifier three (OP3) is connected to after output end connection resistance three (R3) of operational amplifier two (OP2)
Positive input；Its reverse input end is connected to after output end connection resistance three (R3) of operational amplifier three (OP3).
4. dual power supply digital-control amplifier circuit as described in claim 1, it is characterised in that: the single supply digital regulation resistance
It (RT) is the CMOS single supply digital regulation resistance with digital communication SPI interface, operating voltage range is 2.5V~5.5V.
5. dual power supply digital-control amplifier circuit as described in claim 1, it is characterised in that: the resistance value of the resistance one (R1) is
1K Ω~100K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920155485.XU CN209264037U (en) | 2019-01-29 | 2019-01-29 | Dual power supply digital-control amplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920155485.XU CN209264037U (en) | 2019-01-29 | 2019-01-29 | Dual power supply digital-control amplifier circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209264037U true CN209264037U (en) | 2019-08-16 |
Family
ID=67585006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920155485.XU Active CN209264037U (en) | 2019-01-29 | 2019-01-29 | Dual power supply digital-control amplifier circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209264037U (en) |
-
2019
- 2019-01-29 CN CN201920155485.XU patent/CN209264037U/en active Active
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