CN100594671C - Prepositive differential amplifier and method for expanding its input range - Google Patents
Prepositive differential amplifier and method for expanding its input range Download PDFInfo
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- CN100594671C CN100594671C CN200610112619A CN200610112619A CN100594671C CN 100594671 C CN100594671 C CN 100594671C CN 200610112619 A CN200610112619 A CN 200610112619A CN 200610112619 A CN200610112619 A CN 200610112619A CN 100594671 C CN100594671 C CN 100594671C
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Abstract
This invention relates to a method for extending the range of the input of a pre-differential amplifier. It is composed of: a syntropy input buffer, reverse input buffer, feedforward network, differential output center potential offset circuit, input mode selection. The steps are: the output, from the pre-amplifier and of differential signal input, is proceeded the reversion, after that, forward feeding to a input end of another input buffer amplifier, or the half differential output signal feeding-back to the reverse end of the differential amplifier. This invention method is used for converts single-ended signals into differential signals, particularly, by using delivering feedforward, the bias voltage reverse floating with 1/2 difference mode signal is produced, the center potential ofinput signal keeps the reference level. And an offset voltage can be added into said reference level, and eliminating effectively common-mode noise, and extending the amplifier input range.
Description
Technical field
The present invention relates to high impedance difference input front buffer amplifier, is a kind of preposition differential amplifier input range extended method and preposition differential amplifier concretely.
Background technology
Usually high accuracy ∑-Δ single supply analog-digital converter (A/D device) adopts the balance input mode, the programmable gain amplifier (PGA) of instrument amplifier type that inside is provided with the buffer of high impedance amplifies difference mode signal and changes, utilize high cmrr that balance input had preamplifier as the AD system, to improve the common-mode rejection ratio of input, reduce The noise.But, the A/D device is owing to have only the 5V single power supply usually, the input range school is little, and the voltage of Universal Electronic Test Instrument measured signal and source resistance range thereof are much wide, and needing the switching of multiple measurement function and the decay of gain, this just has higher requirement to the input range and the input impedance of preamplifier.
Shown in Fig. 1 (a), be the high-impedance preamplifier of single-ended input, the A/D chip for the balance that is connected to single power supply is imported must be tied to an end of input signal a fixing voltage, binds A/D chip input range (V usually
AN) midpoint potential V
Ref, like this certainly will be owing to V
NCurrent potential be fixed V
OUT=V
P-V
NCan only export ± 1/2V
ANShown in Fig. 1 (b), be the difference input mode, though the output area of the good common mode inhibition capacity and the full width of cloth, V are arranged
OUT=V
P-V
N=± V
AN, but because two input resistance R1 and R2 are arranged, make input impedance can not do very greatly, so just limited its range of application.As the input mode that adopts common preamplifier will be subjected to the restriction of following factor:
(1) owing to adopts the AD chip of difference input to adopt single power supply usually, the midpoint potential of difference input need be raised the dynamic range that 1/2 of input voltage range could effectively utilize input, when being connected with single-ended signal, single-ended signal need be raised to connect, and can lose the dynamic range of input.
(2) as adopting uneven input mode, though can obtain high input impedance, but in this manner, an input of amplifier is as the ground connection reference, two input amplifiers can not be born the amplification to difference mode signal jointly, thereby its effective input range is littler more than 1/2 than balance input mode, the amplifier and the follower of uneven input mode of while, because of its single-ended input mode to exchanging common mode disturbances completely without inhibitory action, the mode that will rely on analog-and digital-filtering is eliminated fully, so also variation of common mode rejection performance.
(3) as adopting the balance input mode, usually there is not common port between measured signal and the amplifier, make and have high input impedance buffer operate as normal, the path of its input bias current must be provided, otherwise two inputs suspend, because the accumulation of the electric charge on the input capacitance causes importing amplifier the most at last and surpasses common mode range and enter saturation condition.Therefore, need at two inputs by substitutional resistance ground connection so that the bias current path to be provided.Like this, its input impedance is incited somebody to action mainly and is determined by two biasing resistors, thereby can not be very high.
The front end input buffer amplifier design difficulty of universal electric measuring instrument at first is the inhibition to the buffering and the common mode disturbances of wide region input signal.But be subjected to the restriction of input range and input impedance, some instrument products are had to then are taked the parallel scheme of importing of two groups of amplifiers both at home and abroad, promptly by FET pipe and amplifier being constituted accurate high-impedance amplifier provides small-signal to amplify, make the large-signal buffering and constitute single-ended follower by low bias current amplifier, by the output bootstrap approach for the working power that changes with input signal is provided himself, thereby acquisition ± 30V buffering range.
From circuit structure, the follower of the scheme of two groups of parallel inputs of amplifier need be by the power supply of output boostrap circuit, and need provide one group of pact ± 40V high voltage source could obtain ± the 30V buffering range, simultaneously, for guaranteeing small signal amplifier performance and necessary dynamic range, its FET input circuit also needs a cover servo circuit to provide the working power related with input signal for it, dynamically to keep appropriate working point.In addition, when large-signal is imported, be the protection small signal amplifier, must cut off its input.These not only make circuit become very complicated, and cost greatly improves, and also makes the amplifier speed decreased performance.
Summary of the invention
The invention provides a kind of preposition differential amplifier input range extended method and preposition differential amplifier, be used for single-ended signal is converted to differential signal, be meant mode especially by the output feedforward, form a bias voltage that oppositely floats with 1/2 difference mode signal, the midpoint potential of input signal is remained on the reference level, the current potential at zero point of signal is carried out conversion, can effectively remove common-mode noise simultaneously, and the input range of amplifier is enlarged.
In order to realize above-mentioned goal of the invention, one of purpose of the present invention is, a kind of preposition differential amplifier input range extended method is provided, said method comprising the steps of: input mode is selected step, is used to select the input mode of the uneven input mode of the balance input mode of corresponding difference input or corresponding single-ended input as differential amplifier; Output feedforward step, be used for output signal with the forward buffer amplifier of preposition differential amplifier through feeding back to an input of reverse input buffer amplifier after anti-phase, just, feed back to the reverse input end of described preposition differential amplifier with after the anti-phase decay 1/2 of differential mode output signal.
Described output feedforward step comprises: after the anti-phase decay 1/2 of differential mode voltage with described preposition differential amplifier output, it is fed back to the reverse input end of described preposition differential amplifier.
When oppositely amplifying, add a dc offset voltage, make the midpoint potential of the voltage signal of described forward input buffer amplifier and described reverse input buffer amplifier output obtain translation.
The output signal of described preposition differential amplifier is input to an attenuation network to decay;
The A/D chip that signal after the decay is input to the difference input of a single supply amplifies.
Another object of the present invention is to, a kind of preposition differential amplifier is provided, this preposition differential amplifier comprises: forward input buffer amplifier and reverse input buffer amplifier; Also comprise: output feedforward network and input mode selection device; The output of described forward input buffer amplifier is connected with described output feedforward network input, and the output of described output feedforward network is connected with the reverse input end of described reverse input buffer amplifier; Wherein, described input mode selection device is used to select the input mode of the uneven input mode of the balance input mode of corresponding difference input or corresponding single-ended input as differential amplifier; Described output feedforward network is used for the output voltage of described forward input buffer amplifier being fed forward to after anti-phase an input of described reverse input buffer amplifier.
Described input mode selection device is a switch, if be the low signal of source resistance, described switch closure is to adopt the balance input mode; If be the high signal of source resistance, described switch disconnects to adopt uneven input mode.
Described output feedforward network is connected and composed by an inverting amplifier and resistance; Wherein, the resistance of described resistance makes described output feedforward network the voltage signal that receives can be decayed 1/2.
In the signal of the input that feeds back to described reverse input buffer amplifier, utilize described output feedforward network, add a dc offset voltage, make the midpoint potential of the voltage signal of described forward input buffer amplifier and described reverse input buffer amplifier output obtain translation.
Described differential amplifier also comprises: an attenuation network and an A/D chip; The output of described forward buffer amplifier is connected with described attenuation network respectively with the output of described reverse buffer amplifier, and the output of described attenuation network is connected with described A/D chip; Wherein, described attenuation network is used for the signal of input is decayed; Described A/D chip is used for that signal to input amplifies, analog-to-digital conversion and output.
Beneficial effect of the present invention is, by a kind of preposition differential amplifier input range extended method and preposition differential amplifier are provided, provides preposition differential amplifier input range expansion scheme, has solved the scaling problem of uneven input.The advantage of overall balance/imbalance input, the front-end amplifier of realization great dynamic range.
Description of drawings
Fig. 1 a is the high-impedance preamplifier circuit diagram of single-ended input in the prior art;
Fig. 1 b is the preamplifier circuit figure of difference input in the prior art;
Fig. 2 is the circuit diagram of embodiments of the invention 2;
Fig. 3 is the circuit diagram of the embodiment of the invention 3.
Embodiment
Below in conjunction with description of drawings the specific embodiment of the present invention.
Embodiment 1
The invention provides a kind of preposition differential amplifier input range extended method, this method can be arranged to preposition differential amplifier balance input mode and uneven input mode by switching.The amplifier solution of a kind of wide input range and high impedance is provided for the front-end amplifier design of electronic measuring instrument.For reaching this purpose, the end output of the high impedance buffer of difference input through being fed forward to the other end (wherein an end can for just also can be for negative) after oppositely, perhaps is fed forward to reverse input end with-1/2 of the differential mode voltage of high impedance buffer output.Simultaneously, when oppositely amplifying, can also add a dc offset voltage, be used for making the midpoint potential of the voltage signal of described forward input buffer amplifier and described reverse input buffer amplifier output to obtain translation.
Embodiment 2
The invention provides a kind of preposition differential amplifier, this differential amplifier can be arranged to preposition differential amplifier balance input mode and uneven input mode by switching.The amplifier solution of a kind of wide input range and high impedance is provided for the front-end amplifier design of electronic measuring instrument.For reaching this purpose, the end output of the high impedance buffer of difference input through being fed forward to the other end (wherein an end can for just also can be for negative) after oppositely, perhaps is fed forward to reverse input end with-1/2 of the differential mode voltage of high impedance buffer output.Simultaneously, when oppositely amplifying, can also add a dc offset voltage, be used for making the midpoint potential of the voltage signal of described forward input buffer amplifier and described reverse input buffer amplifier output to obtain translation.
As shown in Figure 2, for the circuit form of the embodiment of the invention 1: U1, U2 are input buffer amplifier, adopt CMOS or JFET structure high pressure zero shift amplifier, in the circuit of Fig. 1, the input buffer gain is 1.The type of attachment of the output feedforward network of being made up of output feed-forward amplifier U3 as shown in Figure 2.Among Fig. 2 be with the voltage of U1 output through U3 oppositely after, be fed forward to reverse amplification end N by R2.U3 has born the effect of voltage translation, and the midpoint potential (VP+VN)/2 of VP and VN is brought up to VREF.
Signal through behind the buffer is connected to an attenuation network, has guaranteed that large-signal is no more than the input voltage range of A/D chip; Signal by attenuation network is connected to the A/D chip of the difference input of a single supply, and for small-signal, attenuation network is then straight-through, and utilizes the programmable amplifier PGA in the A/D chip to amplify, and further improves small-signal certainty of measurement and resolution.Because signal do not have special voltage translation circuit in entire circuit, reduced drift and temperature that voltage translation circuit caused and floated.As the amplifier employing ± 15V voltage power supply in Fig. 2 circuit, can guarantee ± the linear input range of 12V, no matter circuit is in balanced mode or uneven pattern, the difference input range of circuit can reach ± input range of 24V, just twice input range is arranged with aforesaid unbalanced circuit.By the balance and the uneven pattern of diverter switch K1 change-over circuit, during uneven the input, can reach 10G Ω in theory in the circuit; During the balance input, the about 20M Ω of difference-mode input resistance.
Embodiment 3
As shown in Figure 3, for the circuit form of the embodiment of the invention 3: U1, U2 are input buffer amplifier, adopt CMOS or JFET structure high pressure zero shift amplifier, in the circuit of Fig. 3, the input buffer gain is 1.The type of attachment of output feed-forward amplifier U3 as shown in Figure 3.Be behind the difference mode signal decay G=-1/2 of buffer output, to feed back to the input of U2 among Fig. 3.Under the situation of operate as normal, these two kinds of connected mode feedback quantities of Fig. 2 and Fig. 3 are identical, and dc point also is identical, and are just different to the rejection of common-mode noise.Simultaneously, U3 has born the effect of voltage translation, and the midpoint potential (VP+VN)/2 of VP and VN is brought up to VREF.
Signal through behind the buffer is connected to an attenuation network, has guaranteed that large-signal is no more than the input voltage range of A/D chip; Signal by attenuation network is connected to the A/D chip of the difference input of a single supply, and for small-signal, attenuation network is then straight-through, and utilizes the programmable amplifier PGA in the A/D chip to amplify, and further improves small-signal certainty of measurement and resolution.Because signal do not have special voltage translation circuit in entire circuit, reduced drift and temperature that voltage translation circuit caused and floated.As the amplifier employing ± 15V voltage power supply in Fig. 3 circuit, can guarantee ± the linear input range of 12V, no matter circuit is in balanced mode or uneven pattern, the difference input range of circuit can reach ± input range of 24V, just twice input range is arranged with aforesaid unbalanced circuit.By the balance and the uneven pattern of diverter switch K1 change-over circuit, during uneven the input, can reach 10G Ω in theory in the circuit; During the balance input, the about 20M Ω of difference-mode input resistance.
From embodiments of the invention as can be known,, take the optional input mode of balance/imbalance, promptly select high/low input impedance for the advantage of performance balance input with two kinds of input modes of uneven input.For the not high signal of source resistance, select the balance input mode can obtain optimum precision; And to the signal of high source resistance, the input biasing resistor strengthens the dividing potential drop effect of signal, and the error that it causes will play decisive influence to precision, at this moment adopt uneven input mode can obtain degree of precision.
Be necessary to point out that under uneven mode, the signal of feedforward is-1/2 gain, is positive feedback for negative terminal, for anode then for negative feedback, have only when the amplifier overall gain greater than 1, the output feedforward just may cause the instability of circuit.Therefore, circuit is in a stable state in the course of the work.
The front end input buffer amplifier design difficulty of universal electric measuring instrument at first is the inhibition to the buffering and the common mode disturbances of wide region input signal.The form of the big device of buffering proposed by the invention is carried and has been total to the input range expansion scheme, has solved the scaling problem of uneven input.Like this, in the mode of introducing in the application example, but the advantage of just overall balance/imbalance input, the solution of realization great dynamic range front-end amplifier.
Compare with parallel input scheme, the present invention program is under the balance input mode, and its optimum measurement precision can cover whole input ranges, for the not really high signal measurement of most of sources resistance, obviously is better than the former.Signal measurement for high source resistance, amplifier must be taked uneven input mode, and this will cause its common mode rejection performance to descend, but the former amplifier and follower, because of its single-ended input mode to exchanging common mode disturbances completely without inhibitory action, the mode that will rely on analog-and digital-filtering is fully eliminated.
From circuit structure, the present invention is a meta structure, the circuit performance that simply and not underspeeds.Compared with prior art, superiority of the present invention is conspicuous.
More than analyze and comparison shows that, the expansion of preposition differential amplifier input range, not only the front-end amplifier design for electronic measuring instrument provides a kind of new selection, because the solution of uneven input scaling problem, input range under the high and low input impedance can both enlarge at double, also will further expand the application space of preposition differential amplifier in the instrument, have very strong realistic meaning.
Above embodiment only is used to illustrate the present invention, but not is used to limit the present invention.
Claims (10)
1. preposition differential amplifier input range extended method said method comprising the steps of:
Output feedforward step is used for the output signal of preposition differential amplifier is fed back to after anti-phase the reverse input end of preposition differential amplifier;
Midpoint potential biasing step, differential mode output signal with described preposition differential amplifier, after adding a dc offset voltage, together feed back to the reverse input end of described preposition differential amplifier, make the midpoint potential of the differential mode output signal of described preposition differential amplifier output obtain translation;
Input mode is selected step, is used to select the input mode of the uneven input mode of the balance input mode of corresponding difference input or corresponding single-ended input as differential amplifier.
2. method according to claim 1 is characterized in that,
Described output feedforward step comprises, the differential mode output signal of described preposition differential amplifier is anti-phase and decay after 1/2, and it is fed back to the reverse input end of described preposition differential amplifier;
Described midpoint potential biasing step comprises, the differential mode output signal of described preposition differential amplifier by anti-phase and 1/2 the signal of decaying in, add a dc offset voltage, together feed back to the reverse input end of described preposition differential amplifier.
3. method according to claim 1 is characterized in that, described output feedforward step comprises: the differential mode output signal of the output of preposition differential amplifier is anti-phase and decay after 1/2, feed back to the reverse input end of described preposition differential amplifier.
4. method according to claim 3, it is characterized in that, in the signal of the reverse input end that feeds back to described preposition differential amplifier, add a dc offset voltage, be used for making the midpoint potential of the differential mode output signal of described preposition differential amplifier output to obtain translation.
5. method according to claim 4 is characterized in that, the output signal of described preposition differential amplifier is input to an attenuation network decays;
The A/D chip that signal after the decay is input to the difference input of a single supply amplifies.
6. a preposition differential amplifier comprises: forward input buffer amplifier and reverse input buffer amplifier; It is characterized in that also comprising: output feedforward network and input mode selection device;
The output of described forward input buffer amplifier is connected with described output feedforward network input, and the output of described output feedforward network is connected with the reverse input end of described reverse input buffer amplifier; Wherein,
Described input mode selection device is used to select the input mode of the uneven input mode of the balance input mode of corresponding difference input or corresponding single-ended input as preposition differential amplifier;
Described output feedforward network is used for the output voltage of described forward input buffer amplifier feeding back to after anti-phase the input of described reverse input buffer amplifier.
7. preposition differential amplifier according to claim 6 is characterized in that, described input mode selection device is a switch.
8. preposition differential amplifier according to claim 6 is characterized in that, described output feedforward network is connected and composed by an inverting amplifier and resistance; Wherein,
The resistance of described resistance makes described output feedforward network the voltage signal that receives can be decayed 1/2.
9. preposition differential amplifier according to claim 8, it is characterized in that, in the signal of the input that feeds back to described reverse input buffer amplifier, utilize described output feedforward network to add a dc offset voltage, make the midpoint potential of the voltage signal of described forward input buffer amplifier and described reverse input buffer amplifier output obtain translation.
10. according to any described preposition differential amplifier of claim 6 to 9, it is characterized in that also comprising: an attenuation network and an A/D chip;
The output of described forward buffer amplifier is connected with described attenuation network respectively with the output of described reverse buffer amplifier, and the output of described attenuation network is connected with described A/D chip; Wherein,
Described attenuation network is used for the signal of input is decayed;
Described A/D chip is used for that signal to input amplifies, analog-to-digital conversion and output.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2532092B1 (en) | 2010-02-02 | 2019-03-27 | Nokia Technologies Oy | Generation of differential signals |
| CN102466756B (en) * | 2010-11-03 | 2016-01-20 | 北京普源精电科技有限公司 | A kind of zero-error removing method of difference measurement circuit and difference measurement circuit |
| CN102638232B (en) * | 2011-02-15 | 2015-07-15 | 三星半导体(中国)研究开发有限公司 | Port-reusable operational amplifier for microcontroller |
| CN106253869A (en) * | 2016-09-26 | 2016-12-21 | 南京铁道职业技术学院 | A kind of High Speed Data Acquisition Circuit |
| US10191526B2 (en) * | 2016-11-08 | 2019-01-29 | Qualcomm Incorporated | Apparatus and method for transmitting data signal based on different supply voltages |
| CN108336973A (en) * | 2018-01-24 | 2018-07-27 | 大连理工大学 | A kind of drift compensation circuit for operational amplifier |
| US10491166B2 (en) * | 2018-03-01 | 2019-11-26 | Semiconductor Components Industries, Llc | Low noise differential amplifier |
| EP3790189A4 (en) | 2018-06-30 | 2021-05-05 | Huawei Technologies Co., Ltd. | Single end slip differential amplifier and radio frequency receiver |
| CN111835353A (en) * | 2019-04-19 | 2020-10-27 | 深圳市柯雷科技开发有限公司 | Universal conversion circuit from single-ended/differential signal to various differential signals |
| CN110622413B (en) * | 2019-08-15 | 2021-07-20 | 深圳市汇顶科技股份有限公司 | Amplifying circuit, chip and electronic device |
| CN112994650A (en) * | 2021-02-23 | 2021-06-18 | 青岛鼎信通讯股份有限公司 | Differential signal common mode noise suppression device for power distribution terminal communication module |
| CN113659991B (en) * | 2021-07-30 | 2022-04-26 | 北京思凌科半导体技术有限公司 | Control circuit and method of analog-to-digital converter and electronic device |
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Free format text: FORMER OWNER: WANG TIEJUN LI WEISEN Owner name: BEIJING RIGOL TECHNOLOGIES, INC. Free format text: FORMER OWNER: WANG YUE Effective date: 20110511 |
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Effective date of registration: 20110511 Address after: 102206 Beijing City, Shahe Town, step on the river village, No. 156 Patentee after: Beijing Rigol Technologies, Inc. Address before: 102206 Beijing City, Shahe Town, step on the river village, No. 156 Co-patentee before: Wang Tiejun Patentee before: Wang Yue Co-patentee before: Li Weisen |