CN207200676U

CN207200676U - The Zone electromagnetic interference preventing device of integrated circuit

Info

Publication number: CN207200676U
Application number: CN201721289412.7U
Authority: CN
Inventors: 王沈敏; 周琪
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-10-09
Filing date: 2017-10-09
Publication date: 2018-04-06
Anticipated expiration: 2027-10-09

Abstract

The utility model provides the Zone electromagnetic interference preventing device of integrated circuit,Including amplitude limiter circuit,Pre-amplification circuit,First order amplifying circuit,Broadband pass filter,Second level amplifying circuit,Arrowband pass filter and phase-shift circuit,Signal is introduced into amplitude limiter circuit,Amplitude limiter circuit connects pre-amplification circuit,Pre-amplification circuit connects first order amplifying circuit,First order amplifying circuit connects broadband pass filter,Broadband pass filter connection second level amplifying circuit,Second level amplifying circuit connection arrowband pass filter,Arrowband pass filter connection phase-shift circuit,Signal after phase-shift circuit after output filtering,The utility model is designed reasonably,It is easy to use,Input gain level amplifier is used as using high speed low noise double channel A/D A4817 2,It is followed by the AD8429 instrument amplifiers of high common mode rejection performance,Improve rejection ability of the circuit to noise,There is good application prospect.

Description

The Zone electromagnetic interference preventing device of integrated circuit

Technical field

The utility model is specifically related to the Zone electromagnetic interference preventing device of integrated circuit.

Background technology

Information industry flourishes in recent years, and the utilization of integrated circuit is also popularized for daily life, such as mobile phone, individual Computer, household appliances etc. are too numerous to enumerate, the design to integrated circuit also tend to small volume, speed it is fast, loop (Loop) greatly, The working frequency more and more higher of integrated circuit, the sensing between the signal in its loop and magnetic field is bigger, and the phenomenon of electromagnetic interference is got over Seriously.

By taking information processor as an example, its CPU must arrange in pairs or groups integrated circuit and passive component to complete work Make, because the operating rate of CPU usually reaches GHz, therefore required power supply and power also increases, for stable center The efficiency and quality of the power supply of processing unit, typically all arranged in pairs or groups using switching time (switchtime) shorter integrated circuit CPU designs, though the high probability for producing electromagnetic interference of such efficiency is also substantially increased.

How effectively to solve central processing element is one to wait to solve to electromagnetic interference caused by adjacent integrated circuit Technical task certainly.

Utility model content

The purpose of this utility model is to solve above-mentioned deficiency, there is provided the compartmentalization of integrated circuit prevents electromagnetic interference from filling Put.

The purpose of this utility model is achieved through the following technical solutions：

The Zone electromagnetic interference preventing device of integrated circuit, including the amplification of amplitude limiter circuit, pre-amplification circuit, the first order Circuit, broadband pass filter, second level amplifying circuit, arrowband pass filter and phase-shift circuit, signal are introduced into amplitude limiter circuit, amplitude limit electricity Road connects pre-amplification circuit, pre-amplification circuit connection first order amplifying circuit, the logical filter in first order amplifying circuit connection broadband Ripple, broadband pass filter connection second level amplifying circuit, second level amplifying circuit connection arrowband pass filter, the connection of arrowband pass filter move Circuitry phase, the signal after phase-shift circuit after output filtering.

Pre-amplification circuit uses dual channel high speed operational amplifier A D4817-2 and instrument amplifier AD8429 amplifiers.

First order amplifying circuit and second level amplifying circuit are same circuits, using AD8007 current feedback computings Amplifier.

Broadband pass filter uses the passive 5 rank broadband-pass filters of LC.

Arrowband pass filter uses the passive 2 rank Chebyshev's narrow-band pass filters of LC.

The utility model has following beneficial effect：

The utility model is designed reasonably, it is easy to use, using high speed low noise double channel A/D A4817-2 as input gain level Amplifier, the AD8429 instrument amplifiers of high common mode rejection performance are followed by, improve rejection ability of the circuit to noise, had well Application prospect.

Brief description of the drawings

Fig. 1 is overall structure diagram of the present utility model；

Fig. 2 is pre-amplification circuit of the present utility model；

Fig. 3 is amplifying circuit of the present utility model；

Fig. 4 is broadband-pass filter of the present utility model；

Fig. 5 is narrow-band pass filter of the present utility model；

Fig. 6 is phase-shift circuit of the present utility model.

Embodiment

The utility model is further described below in conjunction with the accompanying drawings：

As shown in figs 1 to 6, the Zone electromagnetic interference preventing device of integrated circuit, including amplitude limiter circuit 2, preposition amplification Circuit 3, first order amplifying circuit 4, broadband pass filter 5, second level amplifying circuit 6, arrowband pass filter 7 and phase-shift circuit 8, signal 1 is introduced into amplitude limiter circuit 2, and amplitude limiter circuit 2 connects pre-amplification circuit 3, and pre-amplification circuit 3 connects first order amplifying circuit 4, First order amplifying circuit 4 connects broadband pass filter 5, and broadband pass filter 5 connects second level amplifying circuit 6, second level amplifying circuit 6 Arrowband pass filter 7 is connected, arrowband pass filter 7 connects phase-shift circuit 8, the signal 9 after phase-shift circuit 8 after output filtering.

Broadband pass filter uses the passive 5 rank broadband-pass filters of LC.

Operation principle：Increased using the dual channel high speed operational amplifier A D4817-2 of wide bandwidth, ultra-low noise as input Beneficial level, there is very high input impedance.Using differential amplifiers of the instrument amplifier AD8429 as rear stage, there is ultralow input Noise, tiny signal can be measured in -40~125 DEG C of wide temperature ranges, and there is higher common-mode rejection ratio, can prevented Only interference signal destroys data acquisition.The compound instrument amplifier of construction had both remained the low noise of single-chip instrument amplifier, height altogether The performance of mould rejection ratio, C is ac coupling capacitor in pre-amplification circuit, and R is provides the resistance of DC channel to amplifier. Meanwhile resistance R and electric capacity C forms a high-pass filter, part low-frequency noise can be filtered out, reduces noise bandwidth, improves letter Make an uproar ratio.Using the passive 2 rank Chebyshev's narrow-band pass filters of LC, only allow the signal of specific frequency by returning after amplification Ripple signal band is controlled, and can largely suppress noise, further improves signal to noise ratio and resolution ratio.

Claims

1. the Zone electromagnetic interference preventing device of integrated circuit, including amplitude limiter circuit, pre-amplification circuit, the first order amplification electricity Road, broadband pass filter, second level amplifying circuit, arrowband pass filter and phase-shift circuit, it is characterised in that：Signal is introduced into amplitude limit electricity Road, amplitude limiter circuit connection pre-amplification circuit, pre-amplification circuit connection first order amplifying circuit, the connection of first order amplifying circuit Broadband pass filter, broadband pass filter connection second level amplifying circuit, second level amplifying circuit connection arrowband pass filter, narrow bandpass filter Ripple connects phase-shift circuit, the signal after phase-shift circuit after output filtering.

2. the Zone electromagnetic interference preventing device of integrated circuit according to claim 1, it is characterised in that：Before described Put amplifying circuit and use dual channel high speed operational amplifier A D4817-2 and instrument amplifier AD8429 amplifiers.

3. the Zone electromagnetic interference preventing device of integrated circuit according to claim 1, it is characterised in that：Described One-level amplifying circuit and second level amplifying circuit are same circuits, using AD8007 current feedback operational amplifiers.

4. the Zone electromagnetic interference preventing device of integrated circuit according to claim 1, it is characterised in that：Described width Bandpass filtering uses the passive 5 rank broadband-pass filters of LC.

5. the Zone electromagnetic interference preventing device of integrated circuit according to claim 1, it is characterised in that：Described is narrow Bandpass filtering uses the passive 2 rank Chebyshev's narrow-band pass filters of LC.