CN206077341U - A kind of High Speed Data Acquisition Circuit - Google Patents

A kind of High Speed Data Acquisition Circuit Download PDF

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Publication number
CN206077341U
CN206077341U CN201621081899.5U CN201621081899U CN206077341U CN 206077341 U CN206077341 U CN 206077341U CN 201621081899 U CN201621081899 U CN 201621081899U CN 206077341 U CN206077341 U CN 206077341U
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CN
China
Prior art keywords
circuit
data acquisition
high speed
speed data
amplification
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Expired - Fee Related
Application number
CN201621081899.5U
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Chinese (zh)
Inventor
王邠
闵向阳
许鹤
李静
陈文震
王祥祥
仲崇磊
孙向前
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Nanjing Institute of Railway Technology
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Nanjing Institute of Railway Technology
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Priority to CN201621081899.5U priority Critical patent/CN206077341U/en
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Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

This utility model provides a kind of High Speed Data Acquisition Circuit.The High Speed Data Acquisition Circuit includes the pre-amplification circuit for output difference signal and the A/D converter circuit for output digit signals, the pre-amplification circuit is electrically connected with signal source, and receive the analogue signal that the signal source sends, and the pre-amplification circuit is electrically connected with the A/D converter circuit, the pre-amplification circuit is AD8138 type difference amplifiers.The beneficial effects of the utility model are:The High Speed Data Acquisition Circuit can ensure signal integrity and resolution under high-speed condition.

Description

A kind of High Speed Data Acquisition Circuit
Technical field
This utility model is related to A/D converter, and in particular to a kind of High Speed Data Acquisition Circuit.
Background technology
In A/D Acquisition Circuit, as the speed of signal is very high, i.e., signal has very high bandwidth;And as IC is exported The raising of switching speed so that the rising and falling time of signal reduces rapidly, this requires that A/D converter circuit should be high speed System, so just can guarantee that various signal integrities and enough resolution.But, existing A/D converter is difficult to Meet above-mentioned requirements.
Therefore, it is necessary to propose a kind of to ensure under high-speed condition that signal integrity and the high-speed data of resolution are adopted Collector.
Utility model content
The purpose of this utility model is that offer is a kind of can ensure signal integrity and resolution under high-speed condition High Speed Data Acquisition Circuit.
The technical solution of the utility model is as follows:A kind of High Speed Data Acquisition Circuit is included for before output difference signal Amplifying circuit and the A/D converter circuit for output digit signals are put, the pre-amplification circuit is electrically connected with signal source, and The analogue signal that the signal source sends is received, and the pre-amplification circuit is electrically connected with the A/D converter circuit, it is described Pre-amplification circuit is AD8138 type difference amplifiers.
In the High Speed Data Acquisition Circuit that this utility model embodiment is provided, the A/D converter circuit is ADC cores Piece.
In the High Speed Data Acquisition Circuit that this utility model embodiment is provided, the pre-amplification circuit includes that negative pole is defeated Go out end and cathode output end, the A/D converter circuit includes negative input and electrode input end, the pre-amplification circuit Cathode output end electrically connect with the negative input of the A/D converter circuit, the output of the positive pole of the pre-amplification circuit End is electrically connected with the electrode input end of the A/D converter circuit.
It is in the High Speed Data Acquisition Circuit that this utility model embodiment is provided, also electric including the preposition amplification is arranged on Capacitor between road and the A/D converter circuit, described capacitor one end negative pole respectively with the pre-amplification circuit Outfan and the A/D converter circuit negative input electrical connection, the capacitor other end respectively with the front storing The electrode input end electrical connection of the cathode output end and the A/D converter circuit of big circuit.
The beneficial effects of the utility model are:In the High Speed Data Acquisition Circuit, the pre-amplification circuit and institute State A/D converter circuit and be sequentially connected electrically setting, and the pre-amplification circuit is AD8138 type difference amplifiers, so as to can To realize that the High Speed Data Acquisition Circuit ensures signal integrity and resolution under high-speed condition.
Description of the drawings
Fig. 1 is the structural representation of the High Speed Data Acquisition Circuit that this utility model embodiment is provided;
Fig. 2 is the pin function figure of AD8138 type difference amplifiers in High Speed Data Acquisition Circuit shown in Fig. 1;
Fig. 3 is the electrical block diagram of A/D converter circuit in High Speed Data Acquisition Circuit shown in Fig. 1.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and enforcement Example, is further elaborated to this utility model.It should be appreciated that specific embodiment described herein is only to explain This utility model, is not used to limit this utility model.
The description of specific distinct unless the context otherwise, the element and component in this utility model, quantity both can be with single In the form of, it is also possible in the form of multiple, this utility model is not defined to this.It is appreciated that institute herein The term "and/or" for using is related to and covers one of associated Listed Items or one or more of any and be possible to Combination.
Fig. 1 is referred to, is the structural representation of the High Speed Data Acquisition Circuit that this utility model embodiment is provided.The height Fast data acquisition circuit 100 includes:For the pre-amplification circuit 10 of output difference signal, for the A/D of output digit signals Converter circuit 20 and the capacitor 30 being arranged between the pre-amplification circuit 10 and the A/D converter circuit 20. In the present embodiment, the pre-amplification circuit 10 is electrically connected with signal source, and receives the analogue signal that the signal source sends, and The pre-amplification circuit 10 is electrically connected with the A/D converter circuit 20.
Please refer to Fig. 2, the pre-amplification circuit 10 is AD8138 type difference amplifiers.Specifically, it is described preposition Amplifying circuit 10 is the difference amplifier that single-ended signal input is become differential signal output.
And, for the AD8138 types difference amplifier, the AD8138 types difference amplifier can be put as computing Big device is equally easy to use, and enormously simplify differential signal amplification and drive.The AD8138 types difference amplifier is adopted The proprietary XFCB bipolar technologies manufacture of ADI companies ,-three dB bandwidth is 320MHz, there is provided differential signal, harmonic distortion is existing It is minimum in difference amplifier.And, the AD8138 types difference amplifier has unique internal feedback characteristic, can provide defeated Go out gain and phase matched balance, so as to suppress even-order harmonics;Internal feedback circuitry can then make outside gain setting resistor Unmatched any related gain error is minimum.
And, the difference output of the AD8138 types difference amplifier contributes to the input of balanced differential ADC, makes ADC Highest can be reached.The device is without using the transformator with High Performance ADC, and retains low frequency and DC information.Draw in VOCM On foot, applied voltage just can adjust the common mode electrical level of difference output, so that the input signal of driving single supply ADC can be easily real Existing level conversion.Quick overload is recovered then to can ensure that sampling precision.
Additionally, the AD8138 types difference amplifier possesses good distortion performance, the preferable ADC for becoming communication system drives Dynamic device, it is sufficient to state-of-the art 10 are driven under the conditions of upper frequency to 16 bit pads, and high bandwidth and IP3 characteristics make institute State the gain module during AD8138 type difference amplifiers are suitable as intermediate frequency and baseband signal chain.
Please refer to Fig. 3, the A/D converter circuit 20 is ADC chips, i.e. high-speed AD converter chip.At this In embodiment, the A/D converter circuit 20 is the A/D converter circuit of Differential Input type.Specifically, the ADC chips are The ADC chips of AD9233BCPZ-105 types.
For the ADC chips of the AD9233BCPZ-105 types, the sampling rate of the ADC chips is 105MHZ, is turned Transposition number is 12bit, and input dynamic range is 1Vp-p or 2Vp-p, and voltage reference carries output for ADC or outside provides benchmark Source.
And, between the pre-amplification circuit 10 and the A/D converter circuit 20, the pre-amplification circuit 10 Including cathode output end and cathode output end, the A/D converter circuit 20 includes negative input and electrode input end, described The cathode output end of pre-amplification circuit 10 is electrically connected with the negative input of the A/D converter circuit 20, the front storing The cathode output end of big circuit 10 is electrically connected with the electrode input end of 20 circuit of the A/D converter.
30 one end of capacitor cathode output end and A/D converter electricity respectively with the pre-amplification circuit 10 The negative input electrical connection on road 20,30 other end of capacitor cathode output end respectively with the pre-amplification circuit 10 Electrically connect with the electrode input end of the A/D converter circuit 20.
When the High Speed Data Acquisition Circuit 100 works, the signal source is sent by the pre-amplification circuit 10 Analogue signal is amplified process, and exports corresponding differential signal, and the A/D converter circuit 20 receives the difference letter Number, and the differential signal is converted to into digital signal.Wherein, the capacitor 30 is arranged on 10 He of the pre-amplification circuit Between the A/D converter circuit 20, effect can be filtered to the differential signal.
In the High Speed Data Acquisition Circuit 100 provided compared to prior art, this utility model, the pre-amplification circuit 10 and the A/D converter circuit 20 be sequentially connected electrically setting, and the pre-amplification circuit 10 is that AD8138 type difference is put Big device, such that it is able to realize that the High Speed Data Acquisition Circuit 100 ensures signal integrity and resolution under high-speed condition.
It is obvious to a person skilled in the art that this utility model is not limited to the details of above-mentioned one exemplary embodiment, and And in the case of without departing substantially from spirit or essential attributes of the present utility model, can realize that this practicality is new in other specific forms Type.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and is nonrestrictive, this practicality is new The scope of type is by claims rather than described above is limited, it is intended that the equivalency fallen in claim is contained All changes in justice and scope are included in this utility model.Any reference in claim should not be considered as restriction Involved claim.
Moreover, it will be appreciated that although this specification is been described by according to embodiment, not each embodiment is only wrapped Containing an independent technical scheme, this narrating mode of description is only that those skilled in the art should for clarity Using description as an entirety, the technical scheme in each embodiment can also Jing it is appropriately combined, form those skilled in the art Understandable other embodiment.

Claims (4)

1. a kind of High Speed Data Acquisition Circuit, it is characterised in that include:For the pre-amplification circuit and use of output difference signal In the A/D converter circuit of output digit signals, the pre-amplification circuit is electrically connected with signal source, and receives the signal source The analogue signal of transmission, and the pre-amplification circuit electrically connected with the A/D converter circuit, the pre-amplification circuit is AD8138 type difference amplifiers.
2. High Speed Data Acquisition Circuit according to claim 1, it is characterised in that the A/D converter circuit is ADC cores Piece.
3. High Speed Data Acquisition Circuit according to claim 1, it is characterised in that the pre-amplification circuit includes negative pole Outfan and cathode output end, the A/D converter circuit include negative input and electrode input end, the preposition amplification electricity The cathode output end on road is electrically connected with the negative input of the A/D converter circuit, and the positive pole of the pre-amplification circuit is defeated Go out end to electrically connect with the electrode input end of the A/D converter circuit.
4. High Speed Data Acquisition Circuit according to claim 3, it is characterised in that also including being arranged on the preposition amplification Capacitor between circuit and the A/D converter circuit, described capacitor one end are negative with the pre-amplification circuit respectively The negative input electrical connection of pole outfan and the A/D converter circuit, the capacitor other end are preposition with described respectively The electrode input end electrical connection of the cathode output end of amplifying circuit and the A/D converter circuit.
CN201621081899.5U 2016-09-26 2016-09-26 A kind of High Speed Data Acquisition Circuit Expired - Fee Related CN206077341U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201621081899.5U CN206077341U (en) 2016-09-26 2016-09-26 A kind of High Speed Data Acquisition Circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201621081899.5U CN206077341U (en) 2016-09-26 2016-09-26 A kind of High Speed Data Acquisition Circuit

Publications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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CF01 Termination of patent right due to non-payment of annual fee
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Granted publication date: 20170405

Termination date: 20170926