CN208351358U - A kind of precision voltage reference trims circuit - Google Patents
A kind of precision voltage reference trims circuit Download PDFInfo
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- CN208351358U CN208351358U CN201820710118.7U CN201820710118U CN208351358U CN 208351358 U CN208351358 U CN 208351358U CN 201820710118 U CN201820710118 U CN 201820710118U CN 208351358 U CN208351358 U CN 208351358U
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Abstract
The utility model discloses a kind of circuits that trims of precision voltage reference, including operational amplifier, the first adjustable resistance unit, the second adjustable resistance unit, third adjustable resistance unit, the 4th adjustable resistance unit and the 5th resistance；The in-phase output end of operational amplifier connects the reference voltage before trimming；The output end of operational amplifier is separately connected with the input terminal of third adjustable resistance unit and the input terminal of the 4th adjustable resistance unit；The output end of third adjustable resistance unit is separately connected by the input terminal of the inverting input terminal and the second adjustable resistance unit of the first adjustable resistance unit and operational amplifier, the output end ground connection of the second adjustable resistance unit；The output end of 4th adjustable resistance unit exports the reference voltage after trimming, and the output end of the 4th adjustable resistance unit passes through the 5th resistance eutral grounding.Using the utility model, the precision that trims of reference voltage can be greatly increased, and without occupying excessive chip area.
Description
Technical field
Circuit is trimmed the utility model relates to electronic circuit technology field more particularly to a kind of precision voltage reference.
Background technique
Voltage reference circuit is the important component of IC products, and effect is to generate a stable benchmark electricity
Pressure, the precision of reference voltage have a major impact the performances such as precision, the stability of IC products.By voltages such as band-gap references
The reference voltage that reference circuit generates has that precision is lower, it is therefore desirable to which addition trims circuit to carry out reference voltage
It trims.
As shown in Figure 1, traditional voltage reference trims in circuit, V1 ' ' is the reference voltage before trimming, and R1 ' ', R2 ' ' are
Variable resistance, V2 ' ' are the reference voltage obtained after trimming, wherein V2 ' '=V1 ' ' × (R1 ' '+R2 ' ')/R2 ' '.
As shown in Figures 2 and 3, in practical applications, R1 ' ', R2 ' ' are variable resistances, resistance value by switch K11 ' ',
K12 ' ' ... K1N ' ' and switch K21 ' ', K22 ' ' ... K2N ' ' control.
It is since traditional benchmark voltage trims main problem existing for circuit: it is lower trims precision.Therefore, it is desirable to obtain compared with
High trims precision, then needs to increase the number of switch K11 ' ', K12 ' ' ... K1N ' ' and switch K21 ' ', K22 ' ' ... K2N ' ',
Also need the resistance R11 ' ', R12 ' ' ... R1N ' ' and R20 ' ', R21 ' ' ... R2N ' ' of smaller resistance value form variable resistance R1 ' ',
R2 ' '.But the resistance of smaller resistance value needs to occupy bigger area, increases the cost of chip；Meanwhile there is also lead for switch
Be powered resistance, R11 ' ', R12 ' ' ... R1N ' ' and R20 ' ', R21 ' ' ... R2N ' ' the lesser situation of resistance value under, the conducting of switch
Resistance can seriously affect the precision of variable resistance R1 ' ', R2 ' ', trim precision to reduce.
Utility model content
Technical problem to be solved by the utility model is to provide a kind of structures simply, the high-precision base of compact
Quasi- voltage trims circuit, and can greatly increase reference voltage trims precision.
In order to solve the above-mentioned technical problem, the utility model provides a kind of circuit that trims of precision voltage reference, packet
Include operational amplifier, the first adjustable resistance unit, the second adjustable resistance unit, third adjustable resistance unit, the 4th adjustable resistance
The resistance value of unit and the 5th resistance, the third adjustable resistance unit and the 4th adjustable resistance unit is equal；The operation amplifier
The in-phase output end of device connects the reference voltage before trimming；The output end of the operational amplifier and third adjustable resistance unit
Input terminal and the input terminal of the 4th adjustable resistance unit are separately connected；The output end of the third adjustable resistance unit passes through first
The input terminal of the inverting input terminal and the second adjustable resistance unit of adjustable resistance unit and operational amplifier is separately connected, and described
The output end of two adjustable resistance units is grounded；The output end of 4th adjustable resistance unit exports the reference voltage after trimming,
And the output end of the 4th adjustable resistance unit passes through the 5th resistance eutral grounding.
As an improvement of the above scheme, first adjustable resistance unit includes multiple concatenated first control switches and more
A concatenated first resistor, every one first control switch are in parallel with a first resistor respectively.
As an improvement of the above scheme, second adjustable resistance unit includes multiple concatenated second control switches and more
A concatenated second resistance, every one second control switch are in parallel with a second resistance respectively.
As an improvement of the above scheme, second adjustable resistance unit further includes fixed value resistance, the multiple second electricity
Resistance is connected with fixed value resistance.
As an improvement of the above scheme, the third adjustable resistance unit includes multiple concatenated third control switches and more
A concatenated 3rd resistor, each third control switch are in parallel with a 3rd resistor respectively.
As an improvement of the above scheme, the 4th adjustable resistance unit includes multiple concatenated 4th control switches and more
A concatenated 4th resistance, every one the 4th control switch respectively with the 4th resistor coupled in parallel.
As an improvement of the above scheme, the circuit structure phase of the third adjustable resistance unit and the 4th adjustable resistance unit
Together.
Implement the utility model has the beneficial effects that:
It is compared with the traditional method, the utility model does not require the use of the resistance of smaller resistance value, therefore avoids switch conduction
Negative effect of the resistance to circuit is trimmed.
Meanwhile the additional fine tuning stage is increased in the utility model, and coarse tuning stage is combined with the fine tuning stage, greatly
It is big to increase trimming precision (will trim precision and improve tens times to hundreds of times) for reference voltage, and the core excessive without occupancy
Piece area.
Detailed description of the invention
Fig. 1 is the circuit diagram that traditional voltage reference trims circuit；
Fig. 2 is the circuit diagram of variable resistance R1 in Fig. 1；
Fig. 3 is the circuit diagram of variable resistance R2 in Fig. 1
Fig. 4 is the circuit diagram for trimming circuit of the utility model precision voltage reference；
Fig. 5 is the circuit diagram of the first adjustable resistance unit in Fig. 4；
Fig. 6 is the circuit diagram of the second adjustable resistance unit in Fig. 4；
Fig. 7 is another circuit diagram of the second adjustable resistance unit in Fig. 4；
Fig. 8 is the circuit diagram of third adjustable resistance unit in Fig. 4；
Fig. 9 is the circuit diagram of the 4th adjustable resistance unit in Fig. 4；
Specific embodiment
It is practical new to this below in conjunction with attached drawing to keep the purpose of this utility model, technical solution and advantage clearer
Type is described in further detail.Only this state, the present invention occur in the text or will occur up, down, left, right, before and after,
The orientation such as inside and outside word is not to specific restriction of the invention only on the basis of attached drawing of the invention.
Referring to fig. 4, Fig. 4 shows the circuit structure for trimming circuit of the utility model precision voltage reference comprising
Operational amplifier OPA, the first adjustable resistance unit R1, the second adjustable resistance unit R2, third adjustable resistance unit R3, the 4th can
Adjust resistance unit R4 and the 5th resistance R5；Specifically, the benchmark before the in-phase output end connection of the operational amplifier OPA trims
Voltage V1；The output end of the operational amplifier OPA and the input terminal and the 4th adjustable resistance list of third adjustable resistance unit R3
The input terminal of first R4 is separately connected；The output end of the third adjustable resistance unit R3 passes through the first adjustable resistance unit R1 and fortune
The input terminal of the inverting input terminal and the second adjustable resistance unit R2 of calculating amplifier OPA is separately connected, second adjustable resistance
The output end of unit R 2 is grounded；The output end of the 4th adjustable resistance unit R4 exports the reference voltage V3 after trimming, and institute
The output end for stating the 4th adjustable resistance unit R3 is grounded by the 5th resistance R5；The resistance value of the third adjustable resistance unit R3 and
The resistance value of 4th adjustable resistance unit R4 is equal.
Unlike the prior art, the utility model will trim process and be divided into coarse tuning stage and fine tuning stage.
In coarse tuning stage, it is similar with traditional method for repairing and regulating to trim principle.Specifically, the first adjustable resistance list is adjusted respectively
The resistance value of first R1, the second adjustable resistance unit R2, third adjustable resistance unit R3 and the 4th adjustable resistance unit R4, make third can
The resistance value of resistance unit R3 and the 4th adjustable resistance unit R4 is adjusted to be preferably minimized；At this point, V2=V1 × (R1+R2)/R2, V3=
V2。
In the fine tuning stage, keep the resistance value of the first adjustable resistance unit R1 and the second adjustable resistance unit R2 constant, simultaneously
The resistance value for adjusting third adjustable resistance unit R3 and the 4th adjustable resistance unit R4 respectively, makes third adjustable resistance unit R3 and the
Four adjustable resistance unit R4 (resistance value of the third adjustable resistance unit R3 and the resistance value of the 4th adjustable resistance unit R4 are equal,
That is R3=R4) resistance value not in minimum state；At this point, V3 '=V1 × (R1+R2+R3) × R5/ [(R3+R5) × R2].Finally,
By adjusting the resistance value of third adjustable resistance unit R3 and the 4th adjustable resistance unit R4, until obtaining satisfactory benchmark electricity
Press V3.
According to implementation method V3 '-V3 ≈ V1 × R3 (R5-R1-R2)/(R2 × R5) above, therefore, rationally it is arranged
The value of first adjustable resistance unit R1, the second adjustable resistance unit R2 and the 5th resistance R5, enabling K=(R5-R1-R2)/R5 is one
Smaller value obtains V3 '-V3=K × V1 × R3/R2, and for this value compared with tradition trims circuit, precision increases R5/ (R5-R1-
R2) again.
Therefore, by the utility model, the precision that trims of reference voltage can be greatly increased, and without occupying excessively
Chip area.
As shown in figure 5, the first adjustable resistance unit R1 includes multiple concatenated first control switches K11, K12 ...
K1N and multiple concatenated first resistor R11, R12 ... R1N, every one first control switch are in parallel with a first resistor respectively.
It should be noted that the first control switch K11, K12 ... K1N and first resistor in the first adjustable resistance unit R1
R11, R12 ... R1N are corresponded, i.e. first control switch controls a first resistor, when certain the first control switch is closed,
Then first resistor corresponding to first control switch is short-circuited, to realize the flexible tune of the first adjustable resistance unit R1 resistance value
Section.
As shown in fig. 6, second adjustable resistance unit includes multiple concatenated second control switch K21, K22 ... K2N
And multiple concatenated second resistance R21, R22 ... R2N, every one second control switch are in parallel with a second resistance respectively.
It should be noted that the second control switch K21, K22 ... K2N and second resistance in the second adjustable resistance unit R2
R21, R22 ... R2N are corresponded, i.e. second control switch controls a second resistance, when certain the second control switch is closed,
Then second resistance corresponding to second control switch is short-circuited, to realize the flexible tune of the second adjustable resistance unit R2 resistance value
Section.
It is another embodiment of the second adjustable resistance unit R2 referring to Fig. 7, Fig. 7, it is different from embodiment shown in fig. 6
It is that the second adjustable resistance unit R2 described in the present embodiment further includes fixed value resistance R20, the multiple second resistance R21,
R22 ... R2N connects with fixed value resistance R20.
By concatenating fixed value resistance R20 in the second adjustable resistance unit R2, it is ensured that when all first control switches
(i.e. all first resistor R11, R12 ... R1N and second after K11, K12 ... K1N and the second control switch K21, K22 ... K2N closure
Resistance R21, R22 ... R2N are short-circuited), still ensure that there are fixed value resistance R20 in circuit, avoid the output of operational amplifier OPA
End is directly grounded.
As shown in figure 8, the third adjustable resistance unit R3 includes multiple concatenated third control switches K31, K32 ...
K3N and multiple concatenated 3rd resistor R31, R32 ... R3N, each third control switch are in parallel with a 3rd resistor respectively.
It should be noted that third control switch K31, K32 ... K3N and 3rd resistor in third adjustable resistance unit R3
R31, R32 ... R3N are corresponded, i.e. third control switch controls a 3rd resistor, when certain third control switch is closed,
Then 3rd resistor corresponding to the third control switch is short-circuited, to realize the flexible tune of third adjustable resistance unit R3 resistance value
Section.
As shown in figure 9, the 4th adjustable resistance unit R4 includes multiple concatenated 4th control switches K41, K42 ...
K4N and multiple concatenated 4th resistance R41, R42 ... R4N, every one the 4th control switch respectively with the 4th resistor coupled in parallel.
It should be noted that the 4th control switch K41, K42 ... K4N and the 4th resistance in the 4th adjustable resistance unit R4
R41, R42 ... R4N are corresponded, i.e. the 4th control switch controls the 4th resistance, when certain the 4th control switch is closed,
Then the 4th resistance corresponding to the 4th control switch is short-circuited, to realize the flexible tune of the 4th adjustable resistance unit resistance value
Section.
Further, the circuit structure of the third adjustable resistance unit R3 and the 4th adjustable resistance unit R4 is identical, can be just
It is equal in the resistance value of the realization third adjustable resistance unit R3 and the 4th adjustable resistance unit R4 when adjusting.
Below with reference to the first adjustable resistance unit R1, the second adjustable resistance unit R2, third adjustable resistance unit R3 and
The specific structure of four adjustable resistance unit R4, is described in further detail the utility model.
In coarse tuning stage, first third control switch K31, K32 ... K3N and the 4th control switch K41, K42 ... K4N are led
It is logical, then the conducting and shutdown of the first control switch K11, K12 ... K1N and the second control switch K21, K22 ... K2N are controlled, it obtains
The resistance value of corresponding first adjustable resistance unit R1 and the second adjustable resistance unit R2, thus obtain V2=V1 × (R1+R2)/
R2, at this time V3=V2.
In the fine tuning stage, by controlling third control switch K31, K32 ... K3N and the 4th control switch K41, K42 ... K4N
Opening and shutdown, obtain the resistance value (third of corresponding third adjustable resistance unit R3 and the 4th adjustable resistance unit R4
The resistance value of adjustable resistance unit R3 and the resistance value of the 4th adjustable resistance unit R4 are equal, i.e. R3=R4), to obtain V3 '=V1
×(R1+R2+R3)×R5/[(R3+R5)×R2].By adjusting third adjustable resistance unit R3 and the 4th adjustable resistance unit R4
Resistance value, until obtain satisfactory reference voltage V3.
According to implementation method V3 '-V3 ≈ V1 × R3 (R5-R1-R2)/(R2 × R5) above, therefore, rationally it is arranged
The value of first adjustable resistance unit R1, the second adjustable resistance unit R2 and the 5th resistance R5, enabling K=(R5-R1-R2)/R5 is one
Smaller value obtains V3 '-V3=K × V1 × R3/R2, and for this value compared with tradition trims circuit, precision increases R5/ (R5-R1-
R2) again.
Therefore, it is compared with the traditional method, the utility model does not require the use of the resistance of smaller resistance value, therefore avoids switch
Negative effect of the conducting resistance to circuit is trimmed；Meanwhile the additional fine tuning stage is increased in the utility model, and by coarse adjustment rank
Section combined with the fine tuning stage, greatly increase reference voltage trim precision (can will trim precision improve tens times extremely it is up to a hundred
Times), and without occupying excessive chip area.
The above is preferred embodiments of the present invention, it is noted that for the ordinary skill of the art
For personnel, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications
It is considered as the protection scope of the utility model.
Claims (7)
1. a kind of precision voltage reference trims circuit, which is characterized in that including operational amplifier, the first adjustable resistance list
Member, the second adjustable resistance unit, third adjustable resistance unit, the 4th adjustable resistance unit and the 5th resistance, the third is adjustable
The resistance value of resistance unit and the 4th adjustable resistance unit is equal；
The in-phase output end of the operational amplifier connects the reference voltage before trimming；
The input of the output end of the operational amplifier and the input terminal of third adjustable resistance unit and the 4th adjustable resistance unit
End is separately connected；
The output end of the third adjustable resistance unit passes through the inverting input terminal of the first adjustable resistance unit and operational amplifier
And second the input terminal of adjustable resistance unit be separately connected, the output end ground connection of second adjustable resistance unit；
The output end output of 4th adjustable resistance unit trim after reference voltage, and the 4th adjustable resistance unit
Output end passes through the 5th resistance eutral grounding.
2. precision voltage reference as described in claim 1 trims circuit, which is characterized in that the first adjustable resistance list
Member includes multiple concatenated first control switches and multiple concatenated first resistors, every one first control switch respectively with one the
One resistor coupled in parallel.
3. precision voltage reference as described in claim 1 trims circuit, which is characterized in that the second adjustable resistance list
Member includes multiple concatenated second control switches and multiple concatenated second resistances, every one second control switch respectively with one the
Two resistor coupled in parallel.
4. precision voltage reference as claimed in claim 3 trims circuit, which is characterized in that the second adjustable resistance list
Member further includes fixed value resistance, and the multiple second resistance is connected with fixed value resistance.
5. precision voltage reference as described in claim 1 trims circuit, which is characterized in that the third adjustable resistance list
Member includes multiple concatenated third control switches and multiple concatenated 3rd resistors, each third control switch respectively with one the
Three resistor coupled in parallel.
6. precision voltage reference as described in claim 1 trims circuit, which is characterized in that the 4th adjustable resistance list
Member includes multiple concatenated 4th control switches and multiple concatenated 4th resistance, every 1 the 4th control switch respectively with one the
Four resistor coupled in parallel.
7. precision voltage reference as described in claim 1 trims circuit, which is characterized in that the third adjustable resistance list
The circuit structure of member and the 4th adjustable resistance unit is identical.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820710118.7U CN208351358U (en) | 2018-05-11 | 2018-05-11 | A kind of precision voltage reference trims circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820710118.7U CN208351358U (en) | 2018-05-11 | 2018-05-11 | A kind of precision voltage reference trims circuit |
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| CN208351358U true CN208351358U (en) | 2019-01-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110380692A (en) * | 2019-06-28 | 2019-10-25 | 上海类比半导体技术有限公司 | A kind of difference amplifier trims circuit |
| CN110837016A (en) * | 2019-11-19 | 2020-02-25 | 思瑞浦微电子科技（苏州）股份有限公司 | Precision matching resistor array and calibration method thereof |
| CN112003258A (en) * | 2020-08-10 | 2020-11-27 | 西安西电电力***有限公司 | Energy consumption module, energy consumption device and control method and control device thereof |
| CN115061525A (en) * | 2022-07-12 | 2022-09-16 | 上海川土微电子有限公司 | High-precision voltage correction circuit |
| CN115185324A (en) * | 2021-04-07 | 2022-10-14 | 华大半导体有限公司 | Voltage regulating circuit of band-gap reference voltage source |
| CN116632002A (en) * | 2023-07-24 | 2023-08-22 | 江苏兴宙微电子有限公司 | Resistor trimming circuit, design method and design device thereof |
| WO2024098726A1 (en) * | 2022-11-10 | 2024-05-16 | 华为技术有限公司 | Trimming circuit, and chip and electronic device |
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- 2018-05-11 CN CN201820710118.7U patent/CN208351358U/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380692B (en) * | 2019-06-28 | 2020-11-24 | 上海类比半导体技术有限公司 | Trimming circuit of differential amplifier |
| WO2020258396A1 (en) * | 2019-06-28 | 2020-12-30 | 上海类比半导体技术有限公司 | Trimming circuit of differential amplifier |
| CN110380692A (en) * | 2019-06-28 | 2019-10-25 | 上海类比半导体技术有限公司 | A kind of difference amplifier trims circuit |
| CN110837016A (en) * | 2019-11-19 | 2020-02-25 | 思瑞浦微电子科技（苏州）股份有限公司 | Precision matching resistor array and calibration method thereof |
| CN110837016B (en) * | 2019-11-19 | 2021-09-10 | 思瑞浦微电子科技（苏州）股份有限公司 | Precision matching resistor array and calibration method thereof |
| CN112003258A (en) * | 2020-08-10 | 2020-11-27 | 西安西电电力***有限公司 | Energy consumption module, energy consumption device and control method and control device thereof |
| CN112003258B (en) * | 2020-08-10 | 2023-01-31 | 西安西电电力***有限公司 | Energy consumption module, energy consumption device and control method and control device thereof |
| CN115185324B (en) * | 2021-04-07 | 2023-12-29 | 华大半导体有限公司 | Voltage regulating circuit of band-gap reference voltage source |
| CN115185324A (en) * | 2021-04-07 | 2022-10-14 | 华大半导体有限公司 | Voltage regulating circuit of band-gap reference voltage source |
| CN115061525A (en) * | 2022-07-12 | 2022-09-16 | 上海川土微电子有限公司 | High-precision voltage correction circuit |
| CN115061525B (en) * | 2022-07-12 | 2023-11-03 | 上海川土微电子有限公司 | High-precision voltage correction circuit |
| WO2024098726A1 (en) * | 2022-11-10 | 2024-05-16 | 华为技术有限公司 | Trimming circuit, and chip and electronic device |
| CN116632002A (en) * | 2023-07-24 | 2023-08-22 | 江苏兴宙微电子有限公司 | Resistor trimming circuit, design method and design device thereof |
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