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Device for increasing offset voltage of operational amplifier input voltage acquisition and compensation operational amplifier

A technology of offset voltage and input voltage, which is used in improving amplifiers to reduce temperature/power supply voltage changes, etc., can solve problems such as undetectable voltage, and achieve the effect of wide signal acquisition range, accurate signal acquisition, and correction of offset voltage.

Active Publication Date: 2017-09-05
SHANGHAI MOONS AUTOMATION CONTROL CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

That is, the disadvantage of this circuit is that when Va is less than or equal to Vos, the A / D of the MCU cannot detect the voltage at point Va

Method used

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  • Device for increasing offset voltage of operational amplifier input voltage acquisition and compensation operational amplifier
  • Device for increasing offset voltage of operational amplifier input voltage acquisition and compensation operational amplifier
  • Device for increasing offset voltage of operational amplifier input voltage acquisition and compensation operational amplifier

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Embodiment Construction

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0022] A device for increasing the input voltage of the operational amplifier to collect and compensate the offset voltage of the operational amplifier, including a voltage input terminal, an operational amplifier, an MCU, an adder and an auxiliary voltage input terminal, and the input terminal of the adder is connected to the voltage input terminal and the auxiliary voltage input terminal respectively. The output terminal of the adder is connected with the...

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Abstract

The invention relates to a device for increasing the offset voltage of an operational amplifier input voltage acquisition and compensation operational amplifier. The device comprises a voltage input end, an operational amplifier and an MCU (Micro Control Unit), and further comprises an adder and an auxiliary voltage input end, wherein the input end of the adder is connected with the voltage input end and the auxiliary voltage input end respectively, the output end of the adder is connected with the anode input end of the operational amplifier, and the output end of the operational amplifier is connected with the AD end of the MCU. Compared with the prior art, the device has the advantages of wide signal acquisition range, more accuracy in signal acquisition and the like.

Description

technical field [0001] The invention relates to a signal acquisition circuit powered by a single power supply, in particular to a device for increasing the input voltage of an operational amplifier to collect and compensate the offset voltage of the operational amplifier. Background technique [0002] In a signal acquisition circuit powered by a single power supply, such as figure 1 , Input Signal increases unidirectionally from 0V. When Input Signal is a voltage signal, the voltage at point Va is equal to Input Signal voltage. When Input Signal is a current signal, the voltage at Va point is equal to Input Signal current * RS. The ideal output voltage after the Va voltage is amplified by the operational amplifier However, due to the existence of the offset voltage Vos of the operational amplifier, and Vos can be positive or negative, when Vos is positive, the actual output voltage Actual output voltage when Vos is negative Such as figure 2 Description, the Vos curve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/30
CPCH03F1/30
Inventor 张正刚杨志民
Owner SHANGHAI MOONS AUTOMATION CONTROL CO LTD
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