CN201188110Y - Analog wave filter circuit for arbitrary function wave-shape generating system of device burn-in screen vehicle - Google Patents

Abstract

The utility model discloses an analog filtering circuit of an arbitrary function waveform generating system for a device aging and screening vehicle. The analog filtering circuit comprises an addition band pass filter, a second capacitor C2 and an inverting amplifier which are connected in sequence. Through the addition band pass filter, the isolation capacitor and the inverting amplifier which are connected in sequence, the direct current component can be filtered through the isolation capacitor, the inverting amplifier feedbacks the phase of arbitrary function waveform with 180-degree phase difference, the waveform distortion and the burrs are effectively solved, and the arbitrary function waveform generating system is smooth.

Description

The analogue filter circuit of arbitrary function waveform generating system of device aging screening machine

Technical field

The utility model relates to analogue filter circuit, relates in particular to a kind of analogue filter circuit of arbitrary function waveform generating system of device aging screening machine.

Technical background

Device ageing screening lathe is an Electronic Control production production run in enormous quantities, is used for various devices are carried out the equipment of burn-in screen.Device ageing screening lathe is examined under different temperatures the performance of device, needs the precision height, the various function signals of high purity.

What arbitrary function waveform took place to rely on is digital signal, must bring the distortion and the burr of last output analog waveform, how can address this problem, to make that the arbitrary function waveform generating system output waveform smoothly is the utility model problem demanding prompt solution.

Summary of the invention

The purpose of this utility model is to overcome the defective of prior art, and provide a kind of analogue filter circuit of arbitrary function waveform generating system of device aging screening machine, it can effectively solve the distortion and the burr of waveform, makes that the arbitrary function waveform generating system waveform is level and smooth.

The technical scheme that realizes above-mentioned purpose is: the analogue filter circuit of arbitrary function waveform generating system of device aging screening machine, and wherein, it comprises addition bandpass filter, second electric capacity, the inverting amplifier that links to each other successively, wherein:

Described addition bandpass filter comprises one first amplifier A ₁, two parallel connections and with the first amplifier A ₁First resistance R that links to each other of negative input end ₁With second resistance R ₂, the one and first amplifier A ₁Positive input terminal the 5th resistance R that links to each other back ground connection ₅, and be parallel to the described first amplifier A ₁Circuit is propped up in one high-pass filtering at two ends and a low-pass filtering is propped up circuit;

Described second electric capacity is an isolation capacitance;

Described inverting amplifier comprises one second amplifier A ₂, the one and second amplifier A ₂Positive input terminal the 8th resistance R that links to each other back ground connection ₈, the one and second amplifier A ₂The 6th resistance R that links to each other of negative input end ₆, one be parallel to the described second amplifier A ₂The 7th resistance A at two ends ₇

The analogue filter circuit of above-mentioned arbitrary function waveform generating system of device aging screening machine, wherein, the 3rd resistance R that circuit comprises series connection is propped up in described high-pass filtering ₃And inductance L.

The analogue filter circuit of above-mentioned arbitrary function waveform generating system of device aging screening machine, wherein, described low-pass filtering is propped up the 4th resistance R that circuit comprises series connection ₄With first capacitor C ₁

The analogue filter circuit of above-mentioned arbitrary function waveform generating system of device aging screening machine, wherein, described first resistance R ₁The access signal is f (t), described second resistance R ₂The access signal is

Two paths of signals carries out additive operation by the first amplifier A1, $f\left(t\right)=g\left(t\right)+F\left(\frac{T}{128}\right),$ Wherein g (t) is the function waveform of T for the cycle that the function generation systems produces,

Be that one-period is

Square-wave pulse.

The beneficial effects of the utility model are: addition bandpass filter, isolation capacitance and the inverting amplifier of the utility model by linking to each other successively, isolation capacitance can the filtering DC component, inverting amplifier with phase differential 180 ° the phase place of arbitrary function waveform return again, effectively solve the distortion and the burr of waveform, make that the arbitrary function waveform generating system waveform is level and smooth.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

See also Fig. 1, there is shown the analogue filter circuit of arbitrary function waveform generating system of device aging screening machine of the present utility model, it comprises addition bandpass filter 1, second capacitor C that links to each other successively ₂, inverting amplifier 2, wherein:

Addition bandpass filter 1 comprises one first amplifier A ₁, two parallel connections and with the first amplifier A ₁First resistance R that links to each other of negative input end ₁With second resistance R ₂, the one and first amplifier A ₁Positive input terminal the 5th resistance R that links to each other back ground connection ₅, and be parallel to the first amplifier A ₁ Circuit 11 is propped up in one high-pass filtering at two ends and a low-pass filtering is propped up circuit 12, and the 3rd resistance R that circuit 11 comprises series connection is propped up in this high-pass filtering ₃And inductance L, by frequency $f=\frac{L}{R_3},$ Low-pass filtering is propped up the 4th resistance R that circuit 12 comprises series connection ₄With first capacitor C ₁, by frequency $f=\frac{1}{R_4{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="Y20082005679800061.png"\; state="\{\{state\}\}">C</figure-callout>}}_1};$

Second capacitor C 2 is an isolation capacitance, because circuit produces certain DC component, second capacitor C 2 can the filtering DC component;

Inverting amplifier 2 comprises one second amplifier A ₂, the one and second amplifier A ₂Positive input terminal the 8th resistance R that links to each other back ground connection ₈, the one and second amplifier A ₂The 6th resistance R that links to each other of negative input end ₆, one be parallel to the second amplifier A ₂The 7th resistance A at two ends ₇, inverting amplifier 2 with circuit-formed phase differential 180 ° the phase place of arbitrary function waveform return again.

In the utility model, first resistance R ₁The access signal is f (t), second resistance R ₂The access signal is

Two paths of signals carries out additive operation by the first amplifier A1, $f\left(t\right)=g\left(t\right)+F\left(\frac{T}{128}\right),$ Then $f\left(t\right)+[-F\left(\frac{T}{128}\right)]=g\left(t\right),$ Wherein g (t) is the function waveform of T for the cycle that function generation systems (not shown) produces, Be that one-period is

Square-wave pulse.

In the present embodiment, first, second amplifier A ₁, A ₂Model be LM324, first to the 8th resistance R ₁-R ₈Value is 10K, second capacitor C ₂Be the 10u electrochemical capacitor, first capacitor C ₁Be 0.1u, inductance L is 1uH.

Above embodiment is only for the usefulness of explanation the utility model, but not to the restriction of the utility model protection domain.Relevant those skilled in the art; under the situation that does not break away from spirit and scope of the present utility model; can also make various conversion or modification, and the technical scheme that all are equal to should belong to also within the category of the utility model protection, is limited by each claim.

Claims (4)

1. the analogue filter circuit of arbitrary function waveform generating system of device aging screening machine is characterized in that, it comprises addition bandpass filter, second capacitor C that links to each other successively ₂, inverting amplifier, wherein:

Described addition bandpass filter comprises one first amplifier A ₁, two parallel connections and with the first amplifier A ₁First resistance R that links to each other of negative input end ₁With second resistance R ₂, the one and first amplifier A ₁Positive input terminal the 5th resistance R that links to each other back ground connection ₅, and be parallel to the described first amplifier A ₁Circuit is propped up in one high-pass filtering at two ends and a low-pass filtering is propped up circuit;

Described second capacitor C ₂It is an isolation capacitance;

Described inverting amplifier comprises one second amplifier A ₂, the one and second amplifier A ₂Positive input terminal the 8th resistance R that links to each other back ground connection ₈, the one and second amplifier A ₂The 6th resistance R that links to each other of negative input end ₆, one be parallel to the described second amplifier A ₂The 7th resistance A at two ends ₇

2. the analogue filter circuit of arbitrary function waveform generating system of device aging screening machine according to claim 1 is characterized in that, the 3rd resistance R that circuit comprises series connection is propped up in described high-pass filtering ₃And inductance L.

3. the analogue filter circuit of arbitrary function waveform generating system of device aging screening machine according to claim 1 is characterized in that, described low-pass filtering is propped up the 4th resistance R that circuit comprises series connection ₄With first capacitor C ₁

4. the analogue filter circuit of arbitrary function waveform generating system of device aging screening machine according to claim 1 is characterized in that, described first resistance R ₁The access signal is f (t), described second resistance R ₂The access signal is

Two paths of signals carries out additive operation by the first amplifier A1, $f\left(t\right)=g\left(t\right)+F\left(\frac{T}{128}\right),$ Wherein g (t) is the function waveform of T for the cycle that the function generation systems produces,

Be that one-period is

Square-wave pulse.

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