CN202340219U - Circuit for preprocessing low voltage signal in analog circuit - Google Patents
Circuit for preprocessing low voltage signal in analog circuit Download PDFInfo
- Publication number
- CN202340219U CN202340219U CN 201120485414 CN201120485414U CN202340219U CN 202340219 U CN202340219 U CN 202340219U CN 201120485414 CN201120485414 CN 201120485414 CN 201120485414 U CN201120485414 U CN 201120485414U CN 202340219 U CN202340219 U CN 202340219U
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- voltage signal
- small voltage
- circuit
- differential amplifier
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Abstract
The utility model relates to a circuit for preprocessing 3-5V voltage signals in an analog circuit. The circuit comprises a low voltage signal input end, a first filtering unit, a differential amplifier, a scaling circuit, a reference voltage dividing unit, an emitter follower operational amplifying unit and a signal output end. The low voltage signal input end is connected to the scaling circuit through the first filtering unit and the differential amplifier; the reference voltage dividing unit is connected to the scaling circuit through the emitter follower operational amplifying unit; and the signal output end is connected with the scaling circuit. The circuit for preprocessing the low voltage signal in the analog circuit can improve resolution and signal-to-noise ratio and provide excellent input signals for analog to digital (A/D) conversion.
Description
Technical field
The utility model belongs to electricity field, relates to the pre-process circuit of the medium and small voltage signal of a kind of analog circuit, relates in particular to the pre-process circuit of the voltage signal of voltage range 3～5V in a kind of analog circuit.
Background technology
In the analog circuit of certain computer; The form of analog signal varied (comprising current mode signal, ac voltage signal, small voltage signal etc.), these signals will at first carry out preliminary treatment such as filtering, dividing potential drop amplitude limit, signal amplification to it before the A/D conversion; Eliminate noise jamming; Increase the driving force and the antijamming capability of signal, satisfy the initial conditions of A/D conversion, improve resolution and certainty of measurement; Use circuit such as isolation, protection to avoid anomaly such as the contingent superpressure of input signal simultaneously to the inside modules components from being damaged.The relevant report that this circuit is not arranged at present as yet.
The utility model content
In order to solve the above-mentioned technical problem that exists in the background technology, the pre-process circuit that the utility model provides a kind of and improve resolution, improve signal to noise ratio and change the medium and small voltage signal of analog circuit of the input signal that provides good for A/D.
The technical solution of the utility model is: the utility model provides the pre-process circuit of the medium and small voltage signal of a kind of analog circuit, and its special character is: the pre-process circuit of the medium and small voltage signal of said analog circuit comprises small voltage signal input part, first filter unit, differential amplifier, scale operation circuit, normal voltage partial pressure unit, penetrates with amplifier unit and signal output part; Said small voltage signal input part inserts the scale operation circuit through first filter unit and differential amplifier successively; Said normal voltage partial pressure unit inserts the scale operation circuit through penetrating with the amplifier unit; Said signal output part links to each other with the scale operation circuit.
The pre-process circuit of the medium and small voltage signal of above-mentioned analog circuit also comprises second filter unit; The said second filter unit access differential amplifier.
Above-mentioned small voltage signal input part comprises the first small voltage signal input part and the second small voltage signal input part; The said first small voltage signal input part and the second small voltage signal input part insert first filter unit respectively.
Above-mentioned first filter unit comprises first electric capacity that links to each other with the first small voltage signal input part and second electric capacity that links to each other with the second small voltage signal input part; The said first small voltage signal input part is through the first electric capacity access differential amplifier; The said second small voltage signal input part is through the second electric capacity access differential amplifier; Said differential amplifier is the gain differential amplifier; Said gain differential amplifier is INA105; Said second filter unit comprises the 3rd electric capacity, said the 3rd electric capacity access differential amplifier.
The aforementioned proportion computing circuit comprises positive input, reverse input end and output; Said differential amplifier inserts the positive input of scale operation circuit; The said reverse input end that inserts the scale operation circuit with the amplifier unit of penetrating; The output of said scale operation circuit inserts signal output part.
The aforementioned proportion computing circuit is AD713.
Above-mentioned normal voltage partial pressure unit is AD586.
Above-mentioned penetrating with the amplifier unit is to penetrate with amplifier AD713.
The voltage range that above-mentioned small voltage signal input part inserts is 3～5V.
The utility model has the advantages that:
The utility model provides the pre-process circuit of the medium and small voltage signal of a kind of analog circuit, and the analog signals of this circuit is the small voltage signal, voltage range 3～5V, and the input of two-wire difference need be carried out processing and amplifying to it before the A/D conversion, improve rate respectively.The utility model passes through C1, C2 (C1 on two-wire; C2 is 0.1 μ F) carry out first-order filtering, convert thereof into single-ended signal (G=1) through accurate gain differential amplifier (INA105) afterwards, through capacitor C 3 (1000PF) once more after the filtering; For improving conversion resolution; Insert scale operation circuit AD713 (G=2.5), through V0UT=2.5 * Vin-5.5 with 3～5V signal quantization to 2～7V (Δ V=5V), wherein in the scale operation circuit; Amplifier negative terminal input signal is obtained by standard 5V Voltage Reference AD586 dividing potential drop, and penetrates with amplifier AD713 (G=1) with one and to isolate with negative terminal input.The circuit that the utility model provided is a single-ended signal with difference small voltage conversion of signals; And signal amplified to improve resolution; Improve signal to noise ratio through filter circuit; For the A/D conversion provides good input signal, all be improved significantly signal stabilization through pretreated analog signal resolution, signal to noise ratio.
Description of drawings
Fig. 1 is the electrical block diagram that the utility model provides.
Embodiment
The analog signals of the utility model is the small voltage signal, voltage range 3～5V, and the input of two-wire difference need be carried out processing and amplifying to it before the A/D conversion, improve rate respectively, and its operation principle is following:
The pre-process circuit that the utility model provided comprises small voltage signal input part, first filter unit, differential amplifier, scale operation circuit, normal voltage partial pressure unit, penetrates with amplifier unit and signal output part; The small voltage signal input part inserts the scale operation circuit through first filter unit and differential amplifier successively; The normal voltage partial pressure unit inserts the scale operation circuit through penetrating with the amplifier unit; Signal output part links to each other with the scale operation circuit.
The pre-process circuit of the medium and small voltage signal of analog circuit also comprises second filter unit; The second filter unit access differential amplifier.
The small voltage signal input part comprises the first small voltage signal input part and the second small voltage signal input part; The first small voltage signal input part and the second small voltage signal input part insert first filter unit respectively.
First filter unit comprises first electric capacity that links to each other with the first small voltage signal input part and second electric capacity that links to each other with the second small voltage signal input part; The first small voltage signal input part is through the first electric capacity access differential amplifier; The second small voltage signal input part is through the second electric capacity access differential amplifier; Differential amplifier is the gain differential amplifier; The gain differential amplifier is INA105; Second filter unit comprises the 3rd electric capacity, the 3rd electric capacity access differential amplifier.
The scale operation circuit comprises positive input, reverse input end and output; Differential amplifier inserts the positive input of scale operation circuit; Penetrate the reverse input end that inserts the scale operation circuit with the amplifier unit; The output of scale operation circuit inserts signal output part.
Particularly, the physical circuit of the pre-process circuit of the medium and small voltage signal of analog circuit that the utility model provided is referring to Fig. 1, and wherein, VH, VL are two inputs of small voltage signal.At first on two-wire, pass through C1, C2 (C1; C2 is 0.1 μ F) carry out first-order filtering, convert thereof into single-ended signal (G=1) through accurate gain differential amplifier (INA105) afterwards, through capacitor C 3 (1000PF) once more after the filtering; For improving conversion resolution; Insert scale operation circuit AD713 (G=2.5), through V0UT=2.5 * Vin-5.5 with 3～5V signal quantization to 2～7V (Δ V=5V), wherein in the scale operation circuit; Amplifier negative terminal input signal is obtained by standard 5V Voltage Reference AD586 dividing potential drop, and penetrates with amplifier AD713 (G=1) with one and to isolate with negative terminal input.
In discharge circuit,, can know: VPin2=VPin3=Vb, IR2=IR3 according to the short and empty disconnected notion of void; And IR2=(Va-Vc)/R2, IR3=(VOUT-Va)/R3, so (Va-Vc)/R2=(VOUT-Va)/R3, and R2=10K; R3=15K, thus (Va-Vc)/10=(VOUT-Va)/15,3 (Va-Vc)=2 (VOUT-Va), the notion that VOUT=2.5Va-Vc*3/2 is short according to void; So Va=Vb is VOUT=2.5Vb-Vc*3/2
The notion short according to void penetrated the output Vc=VPin6=VPin5=Vd with amplifier AD713,
Voltage Reference AD586 provides 5V voltage
Vd＝5*R5/(R4+R5)＝5*10/(10+3.64)≈11/3
So VOUT=2.5Vb-Vd*3/2=2.5Vb-5.5,
This circuit is a single-ended signal with difference small voltage conversion of signals; And signal amplified to improve resolution, improve signal to noise ratio through filter circuit, for the A/D conversion provides good input signal; All be improved significantly signal stabilization through pretreated analog signal resolution, signal to noise ratio.
R1＝8.2KΩ，R2＝10KΩ，R3＝15KΩ，R4＝3.64KΩ，R5＝10KΩ，C1＝0.1μF，C2＝0.1μF，C3＝1000PF，C4＝1μF。
Claims (9)
1. the pre-process circuit of the medium and small voltage signal of analog circuit, it is characterized in that: the pre-process circuit of the medium and small voltage signal of said analog circuit comprises small voltage signal input part, first filter unit, differential amplifier, scale operation circuit, normal voltage partial pressure unit, penetrates with amplifier unit and signal output part; Said small voltage signal input part inserts the scale operation circuit through first filter unit and differential amplifier successively; Said normal voltage partial pressure unit inserts the scale operation circuit through penetrating with the amplifier unit; Said signal output part links to each other with the scale operation circuit.
2. the pre-process circuit of the medium and small voltage signal of analog circuit according to claim 1 is characterized in that: the pre-process circuit of the medium and small voltage signal of said analog circuit also comprises second filter unit; The said second filter unit access differential amplifier.
3. the pre-process circuit of the medium and small voltage signal of analog circuit according to claim 1 and 2 is characterized in that: said small voltage signal input part comprises the first small voltage signal input part and the second small voltage signal input part; The said first small voltage signal input part and the second small voltage signal input part insert first filter unit respectively.
4. the pre-process circuit of the medium and small voltage signal of analog circuit according to claim 3 is characterized in that: said first filter unit comprises first electric capacity that links to each other with the first small voltage signal input part and second electric capacity that links to each other with the second small voltage signal input part; The said first small voltage signal input part is through the first electric capacity access differential amplifier; The said second small voltage signal input part is through the second electric capacity access differential amplifier; Said differential amplifier is the gain differential amplifier; Said gain differential amplifier is INA105; Said second filter unit comprises the 3rd electric capacity, said the 3rd electric capacity access differential amplifier.
5. the pre-process circuit of the medium and small voltage signal of analog circuit according to claim 4 is characterized in that: said scale operation circuit comprises positive input, reverse input end and output; Said differential amplifier inserts the positive input of scale operation circuit; The said reverse input end that inserts the scale operation circuit with the amplifier unit of penetrating; The output of said scale operation circuit inserts signal output part.
6. the pre-process circuit of the medium and small voltage signal of analog circuit according to claim 5 is characterized in that: said scale operation circuit is AD713.
7. the pre-process circuit of the medium and small voltage signal of analog circuit according to claim 6 is characterized in that: said normal voltage partial pressure unit is AD586.
8. the pre-process circuit of the medium and small voltage signal of analog circuit according to claim 7 is characterized in that: said penetrating with the amplifier unit is to penetrate with amplifier AD713.
9. the pre-process circuit of the medium and small voltage signal of analog circuit according to claim 1 is characterized in that: the voltage range that said small voltage signal input part inserts is 3～5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120485414 CN202340219U (en) | 2011-11-29 | 2011-11-29 | Circuit for preprocessing low voltage signal in analog circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120485414 CN202340219U (en) | 2011-11-29 | 2011-11-29 | Circuit for preprocessing low voltage signal in analog circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202340219U true CN202340219U (en) | 2012-07-18 |
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ID=46488905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120485414 Expired - Lifetime CN202340219U (en) | 2011-11-29 | 2011-11-29 | Circuit for preprocessing low voltage signal in analog circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202340219U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112731005A (en) * | 2020-12-04 | 2021-04-30 | 京信通信系统（中国）有限公司 | Power amplifier abnormity detection device, detection method and communication equipment |
| CN114441198A (en) * | 2021-12-28 | 2022-05-06 | 天津德科智控股份有限公司 | Analog torque sensor circuit and device for EPS and using method |
-
2011
- 2011-11-29 CN CN 201120485414 patent/CN202340219U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112731005A (en) * | 2020-12-04 | 2021-04-30 | 京信通信系统（中国）有限公司 | Power amplifier abnormity detection device, detection method and communication equipment |
| CN112731005B (en) * | 2020-12-04 | 2024-05-28 | 京信网络系统股份有限公司 | Power amplifier abnormality detection device, detection method and communication equipment |
| CN114441198A (en) * | 2021-12-28 | 2022-05-06 | 天津德科智控股份有限公司 | Analog torque sensor circuit and device for EPS and using method |
| CN114441198B (en) * | 2021-12-28 | 2023-10-27 | 天津德科智控股份有限公司 | Analog torque sensor circuit and device for EPS and use method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120718 |
|
| CX01 | Expiry of patent term |