CN102497193A - High-precision zero drift compensation circuit for analog multiplier - Google Patents
High-precision zero drift compensation circuit for analog multiplier Download PDFInfo
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- CN102497193A CN102497193A CN2011103766038A CN201110376603A CN102497193A CN 102497193 A CN102497193 A CN 102497193A CN 2011103766038 A CN2011103766038 A CN 2011103766038A CN 201110376603 A CN201110376603 A CN 201110376603A CN 102497193 A CN102497193 A CN 102497193A
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Abstract
The invention discloses a high-precision zero drift compensation circuit for an analog multiplier. The influence of zero drift on the analog multiplier is compensated. The high-precision zero drift compensation circuit comprises the analog multiplier, a transmission line transformer, a reference power supply, a zeroing resistor, a grounding resistor and a temperature sensor, wherein the transmission line transformer is connected to the input end of the analog multiplier, and is used for reducing the influence of biasing current at the input end on the analog multiplier; and fixed voltage is applied to the zeroing end of the multiplier through the reference power supply, the zeroing resistor and the grounding resistor in a voltage share manner to compensate the biasing voltage at the output end. The grounding resistor with a low resistance value is used for reducing the influence of the biasing current at the zeroing end on the analog multiplier; and compensation voltage of which the temperature excursion size is equal to that of the multiplier and the direction is opposite to the direction of the multiplier is formed at the zeroing end of the multiplier through the temperature sensor and the grounding resistor, so that the influence of the temperature excursion on the analog multiplier is reduced effectively. The high-precision zero drift compensation circuit has a simple structure; and suppression to the zero drift of the analog multiplier is improved by an order of magnitude.
Description
Technical field
The present invention relates to analog multiplier, be meant a kind of high-precision analog multiplier drift compensating circuit particularly, belong to circuit design and signal processing field.
Background technology
In the signal processing field, adopt analog multiplier and low pass filter to extract signal correlation usually.When being correlated with a little less than the signal, analog multiplier drift meeting influences the extraction precision of correlation, therefore, must adopt an effective measure and suppress the analog multiplier drift.
The drift of analog multiplier is floated relevant with input bias current, input offset voltage, output offset voltage and temperature.At present, mainly adopt dual mode to suppress multiplier drift, i.e. chopper-zero-stabilized and circuit compensation.Chopper-zero-stabilized mode degree of regulation is higher, but can produce new frequency component; Though the circuit compensation mode can not produce new frequency component, its degree of regulation receives device and temperature effect bigger.Therefore, in the circuit that can not introduce extra frequency, adopt the circuit compensation mode mostly.
Use the circuit compensation mode to realize that the inhibition to the analog multiplier drift mainly is to take corresponding measure to carry out the circuit parameter compensation to input and zeroing end; Generally adopt the difference input at the analog multiplier input; When adopting single-ended input mode,, must guarantee that two inputs are consistent to the equiva lent impedance on ground for reducing the influence of input bias current; But the bias current of two inputs is strict conformance not, so this method inhibition effect is limited.In addition, the bias voltage of analog multiplier output compensates through adding a fixed voltage at the zeroing end, but in conventional use, it is bigger that zeroing holds the resistance on ground to choose, and the end bias current that causes returning to zero is bigger to the influence of analog multiplier.In addition, the performance temperature influence of analog multiplier is also bigger, therefore, is necessary to study a kind of high-precision analog multiplier drift compensating circuit and suppresses drift.
Summary of the invention
The object of the invention is to overcome the deficiency of above-mentioned prior art and a kind of high-precision analog multiplier drift compensating circuit is provided.
Realize that the technical scheme that the object of the invention adopts is: a kind of high-precision analog multiplier drift compensating circuit, comprise analog multiplier, also comprise:
First line transformer is connected the first input end of said multiplier with imbalance-balance mode;
Second line transformer is connected second input of said multiplier with imbalance-balance mode;
In technique scheme, said first, second line transformer comprises toroidal core and the transmission line on the toroidal core, and said toroidal core is the high frequency magnet ring.
Further, for the bias voltage of compensating analog multiplier output, this drift compensating circuit also comprises:
One reference power supply;
One zero-regulator resistor, the one of which end is connected with reference power supply, and the other end is connected the zeroing end of said analog multiplier; And
One earth resistance is connected between the zeroing end and earth terminal of said analog multiplier.
Wherein, earth resistance≤20 Ω.
Float for the temperature that compensates said analog multiplier, this drift compensating circuit also comprises:
One temperature sensor, the one of which end is connected with working power, and the other end is connected with the zeroing end of said analog multiplier; Said temperature sensor has " temperature-electric current " characteristic; During variations in temperature, change electric current, make big or small consistent that temperature variant voltage of earth resistance and analog multiplier output end voltage temperature float through earth resistance; In the opposite direction, thus the influence of low temperature drift to analog multiplier fallen.
The present invention is through carrying out the circuit parameter compensation to analog multiplier input and zeroing end respectively; Reduced multiplier input bias current, zeroing end bias current and temperature and floated influence, improved precision effectively analog multiplier drift compensation to multiplier.Circuit structure of the present invention is simple, and the inhibition of analog multiplier drift is improved an one magnitude.
Description of drawings
Fig. 1 is the circuit theory diagrams of the high-precision analog multiplier drift of the present invention compensating circuit.
Fig. 2 is the drift measured curve sketch map of analog multiplier among the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is further described.
As shown in Figure 1; High-precision analog multiplier drift compensating circuit; Comprise analog multiplier, the first input end of analog multiplier is connected with first imbalance-balance transmission line transformer T1, and second input is connected with second imbalance-balance transmission line transformer T2.Wherein, the first used imbalance-balance transmission line transformer T1 and second imbalance-balance transmission line transformer T2 forms by toroidal core and the transmission line on toroidal core, and used toroidal core is the high frequency magnet ring.
The zeroing end of analog multiplier is connected with earth resistance R2, temperature sensor S and zero-regulator resistor R1 respectively, and wherein temperature sensor S connects working power V, and zero-regulator resistor R1 connects reference power supply VRef.In order to improve the multiplier zero setting accuracy, the resistance value of used earth resistance R2 is R2≤20 Ω in the present embodiment.Voltage on the earth resistance R2 of low resistance can compensate the output bias voltage, thereby has reduced the influence of zeroing end bias current to analog multiplier.
The selection of temperature sensor S can be confirmed by following steps in the present embodiment:
At first, earth resistance R2 is taken as 10 Ω, regulates zero-regulator resistor R1 and makes analog multiplier be output as zero, the temperature characterisitic of test simulation multiplier;
Secondly, confirm to have the temperature sensor S model of " temperature-electric current " characteristic according to the span of the temperature characterisitic of analog multiplier and resistance R 2;
At last, regulate zero-regulator resistor R1 again and make analog multiplier be output as zero, according to the temperature-current characteristics of temperature sensor S induction; Confirm the resistance of earth resistance R2; Temperature sensor and earth resistance are used to compensate the temperature of multiplier output and float, and promptly when variations in temperature, change the electric current through earth resistance; Make big or small consistent, in the opposite direction that voltage that earth resistance R2 go up to change and analog multiplier output end voltage temperature float.
The present invention is connected the input of analog multiplier with imbalance-balance transmission line transformer, because imbalance-balance transmission line transformer input is the high frequency unbalanced signal, its output obtains two equal and opposite in directions, over the ground the high-frequency voltage signal of complete anti-phase; As far as the analog multiplier input, promptly direct current over the ground equivalent resistance be zero, therefore, its bias current does not form pressure drop at input, thereby greatly reduces the influence of input bias current to analog multiplier.
Simultaneously, the present invention adopts low-resistance zeroing technology to compensate the output bias voltage at analog multiplier zeroing end, promptly adopts reference power supply V
Ref, zero-regulator resistor R1 and earth resistance R2 dividing potential drop mode, add a fixed voltage at analog multiplier zeroing end and compensate the output bias voltage, wherein, earth resistance R2≤20 Ω, thus reduced of the influence of zeroing end bias current to analog multiplier.
In addition; The present invention is according to the temperature characterisitic of analog multiplier output and the span of earth resistance; Choose temperature sensor S, and further confirm the resistance of earth resistance R2, form one through earth resistance R2 at the zeroing end and float equal and opposite in direction, voltage in the opposite direction with the output temperature with " temperature-electric current " characteristic; Reduce the influence of variations in temperature, thereby the temperature of compensating analog multiplier is floated effectively to the analog multiplier output.
Fig. 2 is the drift measured curve that adopts behind the circuit of the present invention analog multiplier.As shown in Figure 2, compare the drift of conventional analogue multiplier and suppress circuit and can only drift be suppressed at the 1mV magnitude, adopt drift compensating circuit of the present invention after, drift can be suppressed in the 50uV.
Claims (6)
1. a high-precision analog multiplier drift compensating circuit comprises analog multiplier, it is characterized in that also comprising:
First line transformer is connected the first input end of said multiplier;
Second line transformer is connected second input of said multiplier;
Said first, second line transformer input is the high frequency unbalanced signal, and its output obtains two equal and opposite in directions, over the ground the high-frequency voltage signal of complete anti-phase.
2. according to the said high-precision analog multiplier drift compensating circuit of claim 1, it is characterized in that: said first, second line transformer is imbalance-balance transmission line transformer.
3. high-precision analog multiplier drift compensating circuit according to claim 2 is characterized in that: said first, second line transformer comprises toroidal core and the transmission line on the toroidal core, and said toroidal core is the high frequency magnet ring.
4. according to claim 1 or 2 or 3 described high-precision analog multiplier drift compensating circuits, it is characterized in that also comprising:
One reference power supply;
One zero-regulator resistor, the one of which end is connected with reference power supply, and the other end is connected the zeroing end of said analog multiplier.
One earth resistance is connected between the zeroing end and earth terminal of said analog multiplier.
5. high-precision analog multiplier drift compensating circuit according to claim 4 is characterized in that: said earth resistance≤20 Ω.
6. high-precision analog multiplier drift compensating circuit according to claim 4 is characterized in that also comprising:
One temperature sensor; The one of which end is connected with working power, and the other end is connected with the zeroing end of said analog multiplier, and said temperature sensor has " temperature-electric current " characteristic; When variations in temperature; Change is through the electric current of earth resistance, makes big or small consistent, in the opposite direction that temperature variant voltage of earth resistance and analog multiplier output end voltage temperature float.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110376603 CN102497193B (en) | 2011-11-23 | 2011-11-23 | High-precision zero drift compensation circuit for analog multiplier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110376603 CN102497193B (en) | 2011-11-23 | 2011-11-23 | High-precision zero drift compensation circuit for analog multiplier |
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| CN102497193A true CN102497193A (en) | 2012-06-13 |
| CN102497193B CN102497193B (en) | 2013-07-31 |
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| CN 201110376603 Expired - Fee Related CN102497193B (en) | 2011-11-23 | 2011-11-23 | High-precision zero drift compensation circuit for analog multiplier |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066926A (en) * | 2012-12-11 | 2013-04-24 | 中国人民解放军海军工程大学 | Automatic digital zeroing circuit for integral circuit |
| CN105466460A (en) * | 2015-12-18 | 2016-04-06 | 深圳市贝沃德克生物技术研究院有限公司 | Circuit temperature drift compensation system and method of biosensor |
| CN109990804A (en) * | 2019-04-03 | 2019-07-09 | 安徽见行科技有限公司 | The self-correcting positive circuit of sensor circuit temperature drift based on analog multiplier |
| CN111539169A (en) * | 2020-03-27 | 2020-08-14 | 中国人民解放军海军工程大学 | Debugging method of high-precision zero drift compensation circuit of analog multiplier |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050105596A1 (en) * | 2003-11-13 | 2005-05-19 | Yiping Fan | Receiver based method for de-spreading of spread spectrum signal |
| JP2005134210A (en) * | 2003-10-29 | 2005-05-26 | Kansai Electric Power Co Inc:The | Ac power meter and ac watt-hour meter |
| US20090039977A1 (en) * | 2007-08-07 | 2009-02-12 | Samsung Electro-Mechanics Co., Ltd. | Balun transformer |
| CN101788307A (en) * | 2010-03-31 | 2010-07-28 | 连云港杰瑞电子有限公司 | Signal-digit converter of low-temperature drift rotary transformer |
| CN101828100A (en) * | 2008-07-28 | 2010-09-08 | 株式会社奥巴尔 | Temperature measurement circuit in flowmeter |
-
2011
- 2011-11-23 CN CN 201110376603 patent/CN102497193B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005134210A (en) * | 2003-10-29 | 2005-05-26 | Kansai Electric Power Co Inc:The | Ac power meter and ac watt-hour meter |
| US20050105596A1 (en) * | 2003-11-13 | 2005-05-19 | Yiping Fan | Receiver based method for de-spreading of spread spectrum signal |
| US20090039977A1 (en) * | 2007-08-07 | 2009-02-12 | Samsung Electro-Mechanics Co., Ltd. | Balun transformer |
| CN101828100A (en) * | 2008-07-28 | 2010-09-08 | 株式会社奥巴尔 | Temperature measurement circuit in flowmeter |
| CN101788307A (en) * | 2010-03-31 | 2010-07-28 | 连云港杰瑞电子有限公司 | Signal-digit converter of low-temperature drift rotary transformer |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066926A (en) * | 2012-12-11 | 2013-04-24 | 中国人民解放军海军工程大学 | Automatic digital zeroing circuit for integral circuit |
| CN103066926B (en) * | 2012-12-11 | 2015-08-19 | 中国人民解放军海军工程大学 | The steady zero circuit of automatic digital for integrating circuit |
| CN105466460A (en) * | 2015-12-18 | 2016-04-06 | 深圳市贝沃德克生物技术研究院有限公司 | Circuit temperature drift compensation system and method of biosensor |
| CN105466460B (en) * | 2015-12-18 | 2019-08-30 | 深圳市贝沃德克生物技术研究院有限公司 | The circuit temperature drift compensating system and method for biosensor |
| CN109990804A (en) * | 2019-04-03 | 2019-07-09 | 安徽见行科技有限公司 | The self-correcting positive circuit of sensor circuit temperature drift based on analog multiplier |
| CN109990804B (en) * | 2019-04-03 | 2021-06-29 | 安徽见行科技有限公司 | Self-correcting circuit of sensor circuit temperature drift based on analog multiplier |
| CN111539169A (en) * | 2020-03-27 | 2020-08-14 | 中国人民解放军海军工程大学 | Debugging method of high-precision zero drift compensation circuit of analog multiplier |
| CN111539169B (en) * | 2020-03-27 | 2022-09-30 | 中国人民解放军海军工程大学 | Debugging method of high-precision zero drift compensation circuit of analog multiplier |
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| CN102497193B (en) | 2013-07-31 |
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