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Oscilloscope provided with frequency response compensating circuit

A technology of frequency response compensation and oscilloscope, applied in the direction of digital variable display, etc., can solve the problems of limited compensation frequency range, affecting the frequency response curve of low frequency band, affecting DC gain, etc., and achieves lower design requirements, good frequency selection performance, and simple circuit Effect

Active Publication Date: 2013-07-03
RIGOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 50Ω input resistance is used for impedance matching with the circuit under test whose output impedance is 50Ω. If the two do not match, signal reflection will occur, which is not conducive to the realization of high bandwidth.
[0013] 1. The compensation frequency range is limited. The frequency response of the analog front-end amplifier circuit often has peaks at high frequencies. If the peaks are large, the amplitude of the peaks needs to be reduced. Only by using a low-pass LC compensation network can the large peaks be reduced. The attenuation is a flat amplitude, but at this time, the LC compensation network will also attenuate the amplitude at lower frequencies a lot, which will inevitably affect the frequency response curve of some low frequency bands
[0014] 2. The RC compensation network will affect the gain at DC

Method used

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  • Oscilloscope provided with frequency response compensating circuit
  • Oscilloscope provided with frequency response compensating circuit
  • Oscilloscope provided with frequency response compensating circuit

Examples

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Effect test

example 1

[0057] Such as Figure 8 As shown, the oscilloscope 80 includes an analog access unit 801 , a frequency response compensation circuit 803 and an analog-to-digital processing unit 802 connected in series in sequence.

[0058] The analog access unit 801 includes a BNC interface 804 connected in series between the input end of the analog access unit 801 and the output end of the analog access unit 801 , and the input end of the analog access unit 801 is connected with the signal a to be tested.

[0059] The analog-to-digital processing unit 802 includes a connection node 805, an analog front-end amplifier circuit 806, an A / D conversion module 807, and a digital processing module connected in series between the input end of the analog-to-digital processing unit 802 and the output end 802 of the analog-to-digital processing unit. 808. The data output terminal of the digital processing module 808 outputs sampling data b used for waveform display. The analog-to-digital processing un...

example 2

[0062] Such as Figure 9 As shown, the oscilloscope 900 includes an analog access unit 901 , a frequency response compensation circuit 903 and an analog-to-digital processing unit 902 connected in series in sequence.

[0063] The analog access unit 901 includes a BNC interface 904 and an attenuation circuit 910 sequentially connected in series between the input end of the analog access unit 901 and the output end of the analog access unit 901 .

[0064] The analog-to-digital processing unit 902 includes a connection node 905, an analog front-end amplifier circuit 906, an A / D conversion module 907, and a digital processing module connected in series between the input end of the analog-to-digital processing unit 902 and the output end 902 of the analog-to-digital processing unit. 908 , the analog-to-digital processing unit 902 further includes a terminal resistor 909 , one end of the terminal resistor 909 is grounded, and the other end is connected to the connection node 905 . Th...

example 3

[0068] Such as Figure 10 As shown, the oscilloscope 100 includes sequentially connected in series: an analog access unit 1001 , a frequency response compensation circuit 1003 and an analog-to-digital processing unit 1002 .

[0069] The analog access unit 1001 includes a BNC interface 1004 connected in series between the input end of the analog access unit 1001 and the output end of the analog access unit 1001;

[0070] The analog-to-digital processing unit 1002 includes an attenuation circuit 1013, a connection node 1005, an analog front-end amplifier circuit 1006, and an A / D conversion module 1007 connected in series between the input end of the analog-to-digital processing unit 1002 and the output end 1002 of the analog-to-digital processing unit. and the digital processing module 1008 , the analog-to-digital processing unit 1002 also includes a terminal resistor 1009 , one end of the terminal resistor 1009 is grounded, and the other end is connected to the connection node ...

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Abstract

The invention provides an oscilloscope provided with a frequency response compensating circuit, which comprises a simulation access unit and an analog / digital processing unit, wherein the frequency response compensating circuit is connected in series between an output end of the simulation access unit and an input end of the analog / digital processing unit and comprises an RLC (resistor, capacitor and inductor) parallel circuit formed in a manner that a resistor, a capacitor and an inductor are connected in parallel; and the RLC parallel circuit is connected between an input end and an output end of the frequency response compensating circuit. According to the oscilloscope, a frequency range of frequency response compensation can be adjusted according to values of resistance, capacitance and inductance; the frequency selection performance of frequency compensation is good; since a trough of the frequency response compensating circuit corresponds to a crest of the original frequency response curve, relatively low frequency bands are not affected when high frequency with a higher peak is compensated; when the signal frequency is very low, the inductance is approximate to short circuit, a terminal resistance value is a signal input value, and the direct current gain is not affected.

Description

technical field [0001] The invention relates to the technical field of test and measurement, in particular to an oscilloscope with a frequency response compensation circuit. Background technique [0002] The input resistance of the oscilloscope is an important indicator of the oscilloscope. After the oscilloscope is connected to the circuit under test, the input resistance of the oscilloscope becomes a part of the circuit under test. The input resistance of the oscilloscope generally has two modes, low-impedance input (usually 50Ω or 75Ω) and high-impedance input (usually 1MΩ). When the input is high-impedance, the impact on the circuit under test is relatively small, but due to the influence of parasitic capacitance, the bandwidth is not high. Next, take 50Ω low-impedance input as an example for illustration. The 50Ω input resistance is used for impedance matching with the circuit under test whose output impedance is 50Ω. If the two do not match, signal reflection will oc...

Claims

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Application Information

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IPC IPC(8): G01R13/02
Inventor 史慧王悦王铁军李维森
Owner RIGOL
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