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Coupling blocking method and operational amplifier

An operational amplifier, blocking technology, used in DC-coupled DC amplifiers, differential amplifiers, improving amplifiers to reduce noise effects, etc., can solve problems such as abnormality and voltage acceleration

Active Publication Date: 2011-09-28
NOVATEK MICROELECTRONICS CORP
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Problems solved by technology

However, the operation result RST of quickly recovering the high potential will cause the second coupling, so that the voltages VN1 and VN2 will increase rapidly
In this way, the operational amplifier 10 will generate a leakage current due to the conduction of the transistors M1 and M2, causing the load signal S_LD on the load RL to generate an abnormal waveform due to the slow charging speed, such as figure 2 shown

Method used

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  • Coupling blocking method and operational amplifier
  • Coupling blocking method and operational amplifier
  • Coupling blocking method and operational amplifier

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Embodiment Construction

[0031] Please refer to image 3 , image 3 is a schematic diagram of a coupling isolation process 30 according to an embodiment of the present invention. The coupling blocking process 30 is used to prevent the load signal from being coupled into the operational amplifier, and includes the following steps:

[0032] Step 300: start.

[0033] Step 302: Generate a system signal before the operational amplifier outputs an operation result.

[0034] Step 304: According to the system signal, at a first time point, interrupt the Miller compensation (Miller compensation) signal path of the operational amplifier.

[0035] Step 306 : According to the system signal, at a second time point, turn on the electrical connection between the output end of the operational amplifier and the load, so as to output an operation result.

[0036] Step 308: end.

[0037] In simple terms, the coupling blocking process 30 is to interrupt the Miller compensation signal path before the operational ampl...

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Abstract

The invention discloses a coupling blocking method, which is used for avoiding a load signal being coupled into an operational amplifier in the operational amplifier. The coupling blocking method comprises the following steps of: before the operational amplifier outputs an operating result, generating a system signal; interrupting a miller compensation signal path of the operational amplifier at a first time point according to the system signal; and switching electrical connection between the output end of the operational amplifier and a load on to output the operating result at a second time point according to the system signal.

Description

technical field [0001] The present invention relates to a coupling isolation method for an operational amplifier and an operational amplifier using the method, in particular to a coupling isolation method for blocking load signals from being coupled into the operational amplifier by interrupting the Miller compensation signal path and an operation using the method amplifier. Background technique [0002] With the advancement of semiconductor process technology, well-designed operational amplifiers have become an indispensable and important component in electronic circuits. As the name implies, the basic function of an operational amplifier is to amplify signals and provide circuit buffering and driving capabilities. Besides, under different connection configurations, the operational amplifier can realize various functions. For example, when connected in a negative feedback configuration, the operational amplifier can amplify the differential input signal by a specific fact...

Claims

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Application Information

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IPC IPC(8): H03F1/26H03F3/45
Inventor 黄如琳苏嘉伟曾柏瑜
Owner NOVATEK MICROELECTRONICS CORP
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