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Single-ended active probe circuit of digital oscilloscope

A digital oscilloscope and active probe technology, applied in the direction of measuring leads/probes, etc., can solve problems such as not being sold in the market, and the design circuit is not given.

Inactive Publication Date: 2012-10-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although there are many related introductions about the principle of oscilloscope active probes, they are all explained from the functional principle, and no specific design circuit is given. However, foreign oscilloscope manufacturers realize it by customizing a dedicated integrated circuit (IC), and This type of IC is not sold in the market

Method used

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  • Single-ended active probe circuit of digital oscilloscope
  • Single-ended active probe circuit of digital oscilloscope
  • Single-ended active probe circuit of digital oscilloscope

Examples

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Embodiment Construction

[0028] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0029] image 3 It is a principle block diagram of a specific embodiment of the digital oscilloscope single-ended active probe circuit of the present invention.

[0030] In this example, if image 3 As shown, the digital oscilloscope single-ended active probe circuit of the present invention includes a high-pass module 1 , a low-pass module 2 , an impedance transformation module 3 , a DC feedback network 4 and an output circuit 5 .

[0031] The high-pass module 1 is a high-frequency signal path, including a DC-blocking capacitor for isolating the DC and low-frequency part...

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Abstract

The invention discloses a single-ended active probe circuit of a digital oscilloscope, which combines high-speed signal completeness test requirements and combines an existing component based on a broadband testing principle for analyzing a single-ended active probe. Through an impedance conversion module, the requirements of the single-ended active probe in high input impedance, smallest input capacitance and small output impedance are realized; simultaneously, through an output circuit, the single-ended active probe circuit can be matched with the input impedance of 50 ohm of the oscilloscope.

Description

technical field [0001] The invention belongs to the technical field of oscilloscopes, and more specifically relates to a digital oscilloscope single-end active probe circuit. Background technique [0002] A digital oscilloscope probe is an electronic component that connects the circuit under test to the input of a digital oscilloscope, and is widely used in electronic testing. Generally, digital oscilloscope probes are divided into passive probes and active probes. [0003] Passive probes are made with wire and connectors and, when attenuation or compensation is required, resistors and capacitors. Passive probes have no active components, namely transistors or amplifiers, and therefore do not need to power the probe. Usually, passive probes have high input impedance (1MΩ or 1MΩ), but limited bandwidth, generally not exceeding 500MHz (-3dB), and are widely used in low bandwidth testing. [0004] Active probes contain or rely on active devices, such as transistors and FETs,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R1/06
Inventor 邱渡裕叶芃杨扩军袁超
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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