Operational amplifier for fA-level input bias current

An operational amplifier and bias current technology, which is applied in the layout of amplifier protection circuits, improving amplifiers to improve efficiency, and improving amplifiers to reduce noise effects, etc., can solve the problem of increasing chip area and power consumption overhead, increasing the complexity of chip internal circuit design performance and other issues, to achieve the effect of small area and power consumption

Pending Publication Date: 2022-06-21
中国人民解放军96901部队23分队
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Problems solved by technology

The above-mentioned shielding process not only requires a high-precision operational amplifier to act as a buffer, but also has high requirements for the offset voltage of the operational amplifier. Usually, it is necessary to use trim technology to calibrate the offset voltage of the operational amplifier, thereby increasing the chip. Area and power consumption overhead, and increase the design complexity of the internal circuit of the chip

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  • Operational amplifier for fA-level input bias current
  • Operational amplifier for fA-level input bias current
  • Operational amplifier for fA-level input bias current

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Embodiment Construction

[0026] In order to make the above objects, features and advantages of the present application more clearly understood, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all the structures related to the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0027] The terms "comprising" and "having" and any variations thereof in this application are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device comprisi...

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Abstract

The invention discloses an operational amplifier for fA-level input bias current. The operational amplifier comprises an ESD protection circuit module, a complementary source follower circuit module, a VGS calibration circuit module and a main operational amplifier circuit module A1, a complementary source follower circuit module is arranged at the input end of a main operational amplifier module, voltage at the two ends of an electrostatic protection device ESD is clamped, leakage current of a main operational amplifier circuit module A1 can be remarkably reduced, interference of the leakage current on current amplification of the main operational amplifier circuit module A1 is avoided, and the stability of the main operational amplifier module A1 is improved. The area and the power consumption overhead of the complementary source follower circuit module are smaller, the complexity of the internal circuit design of a chip is simplified, and the working reliability of the operational amplifier is improved.

Description

【Technical field】 [0001] The invention relates to the field of analog integrated circuit design, in particular to an operational amplifier with an fA-level input bias current. 【Background technique】 [0002] In the application of high-precision current front-end equipment such as electrometers, it is necessary to detect weak current signals at the fA level. In order to accurately detect the weak current signal of the above fA level, the weak current signal needs to be amplified first. The difficulty in amplifying and detecting the weak current signal is that the current signal to be detected is very weak and is easily disturbed by the leakage current in the circuit. The leakage current mainly includes the leakage current from the printed circuit board (PCB) or the ESD protection device inside the chip. leakage current. In addition, the leakage current usually reaches the level of tens of pA, which will cover and flood the current signal to be detected that is only at the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H03F1/26H03F1/52
CPCH03F1/02H03F1/26H03F1/52
Inventor 程金星王庆波于艾温伟伟吴友朋
Owner 中国人民解放军96901部队23分队
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