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Operational amplifying device

A technology of operational amplification and equipment, which is applied in the field of operational amplification equipment, can solve problems such as flooding, affecting test results, and inability to effectively extract weak signals, and achieves strong practicability, high reliability, and remarkable effects

Inactive Publication Date: 2017-06-06
杨宴敏
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  • Abstract
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Problems solved by technology

[0002] At present, the operational amplifiers of conventional dynamic torque testers mostly use ordinary operational amplifiers. The closed-loop gain of ordinary operational amplifiers is determined by the external resistance connected between their inverting input terminals and output terminals. It can only amplify the signal voltage at both ends and DC signal, noise or other common mode voltage
Therefore, the desired signal is drowned by DC offset voltage and noise
For this reason, even the best operational amplifiers cannot effectively extract weak signals, affecting test results

Method used

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Embodiment Construction

[0013] see figure 1 As shown, the present invention includes a sensor, an instrumentation amplifier, a dynamic amplifier, a static amplifier and a selection circuit, and an internal feedback resistor network is provided inside the instrumentation amplifier, and the internal feedback resistor network is isolated from the signal input terminal. The two inputs of the instrumentation amplifier are impedance balanced and high in value, up to ≥10 9 Ω. Its input bias current is low, only 1 nA to 50 nA. Its output impedance is very low, typically only a few milliohms (mΩ) at low frequencies. The closed-loop gain of an ordinary op amp is determined by an external resistor connected between its inverting input and output, which simply amplifies the signal voltage across it and any DC signals, noise, or other common-mode voltages. Therefore, the desired signal is lost in DC offset voltage and noise. For this reason, even the best op amps cannot effectively extract weak signals. In-a...

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Abstract

The invention relates to an operational amplifying device, which comprises a sensor, an instrument amplifier, a dynamic amplifier, a static amplifier and a selective circuit, wherein the instrument amplifier is internally provided with an inner feedback resistance network; and the inner feedback resistance network and a signal input end are isolated. When weak signals are extracted from the sensor and other signal sources, the operational amplifying device of the invention has more obvious advantages and effects compared with a conventional operational amplifying device.

Description

technical field [0001] The invention belongs to the field of manufacturing technology, and in particular relates to an operational amplification device. Background technique [0002] At present, the operational amplifiers of conventional dynamic torque testers mostly use ordinary operational amplifiers. The closed-loop gain of ordinary operational amplifiers is determined by the external resistance connected between their inverting input terminals and output terminals. It can only amplify the signal voltage at both ends and DC signals, noise, or other common-mode voltages. Therefore, the desired signal is lost in DC offset voltage and noise. For this reason, even the best operational amplifiers cannot effectively extract weak signals, affecting the test results. Contents of the invention [0003] The present invention overcomes the deficiencies of the prior art and proposes an operational amplifier. The tester uses an instrument amplifier to extract weak signals from s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175H03M1/12
CPCH03K19/017545H03M1/124
Inventor 杨宴敏
Owner 杨宴敏
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