VGA-based multi-channel variable and intelligent step-down differential circuit based on VGA

Abstract

The invention discloses a VGA-based multi-channel variable and intelligent step-down differential circuit, which comprises a one-out-of-four multi-way switch, a step-down circuit, a control conversioncircuit and a secondary amplifier, wherein the one-out-of-four multi-way switch is provided with four paths of output ends; the step-down circuit comprises a five-hundred-thousandth step-down circuit, a two-ten-thousandth step-down circuit, a four-ten-thousandth step-down circuit and a two-point-five-thousandth step-down circuit; the control conversion circuit comprises a buffer, a differential operational amplifier, a differential protection circuit, a VGA and a VGA gain circuit; and the secondary amplifier is electrically connected with the output end of the control conversion circuit. Attenuation gears are selectively controlled through an electronic switch, and integrated attenuation proportion output measurement of voltage is achieved; and differential probes of different attenuationproportion gears do not need to be frequently replaced, so that use is convenient, and resources are saved.

Description

technical field [0001] The invention relates to the technical field of measurement, in particular to a VGA-based multi-channel variable, intelligent step-down differential circuit. Background technique [0002] To measure high voltage, the differential probe is usually used to set different attenuation gears for measurement, that is, the differential probe needs to step down the high voltage in different proportions, and then convert the output to the usual voltage through the relevant conversion circuit, and the final output voltage obtained is multiplied by The measured voltage can be calculated with the attenuation gear, [0003] Due to the fixed attenuation ratio of the differential probes currently on the market, there are only at most 2 attenuation gears that can be set, and it is impossible to achieve integrated measurement of high voltages in different ranges. Different differential probes need to be replaced and used, which is inconvenient to use and expensive. was...

AI Technical Summary

Problems solved by technology

[0003] Due to the fixed attenuation ratio of the differential probes currently on the market, there are only at most 2 attenuation gears that can be set, and it is impossible to achieve integrated measurement of high voltages in different ranges. Different differential probes need to be replaced and used, which is inconvenient to use and expensive. waste of resources;

[0004] The existing technology can no longer meet the needs of people at the present stage. Based on the current situation, there is an urgent need to reform the existing technology

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