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Operational amplifier circuit with DC offset cancellation technology

An operational amplifier circuit, DC offset technology, applied in DC-coupled DC amplifiers, differential amplifiers, improved amplifiers to reduce temperature/power supply voltage changes, etc., can solve the problem of adding operational amplifiers, differential input stage transistor mismatch, Different DC offsets of operational amplifiers, etc., to achieve the effect of eliminating the DC offset voltage

Active Publication Date: 2019-12-03
ILI TECHNOLOGY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the existing operational amplifiers, due to the process variation in the production process, the transistors in the differential input stage do not match, so that each operational amplifier after mass production has a different DC offset
The DC offset will not be good for the op amp in high precision or high specification applications
An existing way to eliminate the DC offset is to compensate the offset for each operational amplifier by adjusting external components (such as variable resistors). However, this method not only needs to increase the external connection of the operational amplifier Pins thus increase the cost of packaging, and lack of convenience in use

Method used

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  • Operational amplifier circuit with DC offset cancellation technology
  • Operational amplifier circuit with DC offset cancellation technology
  • Operational amplifier circuit with DC offset cancellation technology

Examples

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Embodiment Construction

[0024] refer to figure 1 , a first embodiment of the operational amplifier circuit with DC offset cancellation technology of the present invention includes an operational amplifier 1 and an offset voltage compensator 2 .

[0025] The operational amplifier 1 includes an inverting input terminal (-), a first non-inverting input terminal (+) receiving a first input voltage Vin1, and a second non-inverting input terminal receiving a second input voltage Vin2 (+), and an output terminal providing an output voltage Vout relative to the first and second input voltages Vin1 and Vin2. Wherein, the operational amplifier 1 used in this first embodiment makes the first and second input voltages Vin1, Vin1, Vin2 is added according to their respective weighted values ​​to obtain an input voltage Vin. Here, the weighted value of 1:3 is taken as an example (but not limited to this) for illustration, and Vin is as shown in formula (1):

[0026]

[0027] When there is a mismatch between th...

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PUM

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Abstract

The invention provides an operational amplifier circuit with a direct current offset cancellation technology. The operational amplifier circuit comprises an operational amplifier and an offset voltage compensator; the operational amplifier comprises an inverting input terminal, a first non-inverting input terminal used for receiving a first input voltage, and an output terminal used for providing an output voltage relevant to the first input voltage; and when the inverting input terminal is not matched with the first non-inverting input terminal, an offset voltage exists in a common-mode voltage between the inverting input terminal and the first non-inverting input terminal. The offset voltage compensator is electrically connected among the inverting input terminal, the first non-inverting input terminal and the output terminal of the operational amplifier, copies the offset voltage to obtain a pre-stored voltage which is identical to the offset voltage, and compensates the output voltage according to the pre-stored voltage.

Description

technical field [0001] The invention relates to an operational amplifier circuit, in particular to an operational amplifier circuit with DC offset elimination technology. Background technique [0002] In the existing operational amplifiers, the transistors of the differential input stages do not match due to process variation in the production process, so that each operational amplifier after mass production has a different DC offset. The DC offset will not be good for the operational amplifier in high precision or high specification applications. An existing way to eliminate the DC offset is to compensate the offset for each operational amplifier by adjusting external components (such as variable resistors). However, this method not only needs to increase the external connection of the operational amplifier Foot thus increases the cost of packaging, and also lacks convenience in use. Contents of the invention [0003] The object of the present invention is to provide an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/30H03F3/45
Inventor 钟育庭
Owner ILI TECHNOLOGY CORPORATION
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