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Active differential voltage probe

A differential voltage and fully differential amplifier technology, which is applied in the direction of measuring electricity, measuring electrical variables, and components of electrical measuring instruments, etc., can solve the problems of affecting the detection effect of the probe, poor frequency response, impedance mismatch, etc., and achieve the probe frequency response Good, small input capacitance, wide detection bandwidth effect

Active Publication Date: 2014-12-10
RIGOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The characteristic impedance of the general coaxial cable is 50Ω to 100Ω, which will inevitably lead to impedance mismatch, signal reflection, and poor frequency response, which greatly affects the detection effect of the probe.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] figure 1 It is the circuit diagram of the first embodiment of the active differential voltage probe. As shown, this active differential voltage probe consists of a handle end, a coaxial cable, and a probe amplifier.

[0031] The handle end is provided with two input terminals IN+ and IN- for measuring the positive and negative terminals of the differential signal. The input terminal IN+ is connected with a damping resistor R1P, and the input terminal IN- is connected with a damping resistor R1N. The damping resistor R1P is connected in series with the RC voltage divider circuit formed by the parallel connection of the resistor R2P and the capacitor C1P. The damping resistor R1N is connected in series with the RC voltage divider circuit formed by parallel connection of the resistor R2N and the capacitor C1N. The other end of the RC voltage divider circuit formed by parallel connection of the resistor R2P and the capacitor C1P is connected to the positive output end o...

Embodiment 2

[0043] figure 1 In the first embodiment shown, the active differential voltage probe only uses a fully differential amplifier U1 to implement a proportional amplification circuit. However, if only the one-stage amplifying circuit cannot meet the overall attenuation multiple requirements under the condition of achieving the required bandwidth, the second-stage buffer circuit can be designed to achieve insufficient gain, so as to ensure that the gain of the entire circuit is the gain required by the probe. . figure 2 That is, the circuit diagram of the second embodiment of the active differential voltage probe is given. As shown in the figure, in the second embodiment, a buffer circuit is connected in series between the probe amplifier and the resistors R5 and R6.

[0044] As shown in the figure, the buffer circuit consists of a fully differential amplifier U3 and several resistors. The positive input terminal of the fully differential amplifier U3 is connected to the posit...

Embodiment 3

[0048] In addition to the single amplifier design shown in the first embodiment and the second embodiment, the probe amplifier can also adopt the design mode of two amplifiers. image 3 It is the circuit diagram of the third embodiment of the active differential voltage probe.

[0049] As shown in the figure, the probe amplifier consists of a fully differential amplifier U1, a fully differential amplifier U2 and several capacitors and resistors. The positive input end of the probe amplifier is connected with a terminal resistor RTP, and the negative input end of the probe amplifier is connected with a terminal resistor RTN. The terminal resistor RTP is connected to the negative input terminal of the fully differential amplifier U1, and the terminal resistor RTN is connected to the negative input terminal of the fully differential amplifier U2. The positive input terminals of the fully differential amplifiers U1, U2 are grounded. An RC voltage divider circuit composed of a res...

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Abstract

The invention provides an active differential voltage probe composed of a handle end, a coaxial line and a probe amplifier. The active differential voltage probe provided by the invention has the advantages of higher input resistance, extremely low input capacitance and wider detection bandwidth after the circuit structure is improved. The interference of the probe to a measured signal is less, thus a distortionless detection signal is obtained. Besides, according to the invention, the detection performance of the probe can be further improved by adopting a multipolarity amplifier design method, thus the influence of the length of a probe line on the probe is less, and the frequency response of the probe is good.

Description

technical field [0001] The invention relates to an active differential voltage probe, in particular to an oscilloscope active differential voltage probe for measuring high-frequency electrical signals, which can produce the least interference to the measured signal and obtain an undistorted signal. It belongs to the technical field of electrical signal detection equipment. Background technique [0002] The probe needs to be able to detect the signal without distortion within its frequency band, and not have adverse effects on the system or signal under test. This requires the probe to have a large input resistance, at least much higher than the resistance of the circuit under test itself. However, for high-frequency signals, not only a large input resistance of the probe is required, but also a small capacitance at the tip of the probe is required, otherwise the high-frequency signal will be affected. [0003] Therefore, it is of great significance to design a probe with h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R1/067G01R23/02
Inventor 王悦王铁军李维森
Owner RIGOL
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