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Low-sensitivity substrate input amplifier

A sensitivity and amplifier technology, applied in the direction of amplifiers, differential amplifiers, DC-coupled DC amplifiers, etc., can solve problems such as electromagnetic performance defects and low sensitivity, and achieve improved equivalent transconductance, highly symmetrical conversion rates, and improved resistance Effect of EMI performance

Active Publication Date: 2017-05-31
BEIHANG UNIV
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  • Abstract
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Problems solved by technology

[0004] The present application discloses a low-sensitivity substrate input amplifier to solve the electromagnetic performance defects existing in the existing substrate input amplifier

Method used

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Embodiment Construction

[0024] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0025] The invention proposes a low-sensitivity substrate-input amplifier aiming at some electromagnetic performance defects existing in the existing substrate-input amplifier. The structure uses a positive feedback structure to improve the equivalent input transconductance of the substrate input stage, improves the nonlinearity of the DC characterist...

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Abstract

The invention discloses a low-sensitivity substrate input amplifier for solving the electromagnetic performance defect of the existing substrate input amplifier. The low-sensitivity substrate input amplifier comprises at least one positive feedback structure, and in a preferred embodiment, an improved positive feedback structure comprises a first positive feedback structure and a filter circuit. Further, the amplifier disclosed by the invention comprises a second positive feedback structure. The low-sensitivity substrate input amplifier disclosed by the embodiment of the invention further comprises an offset circuit, a filter circuit and a symmetrical output stage circuit. The low-sensitivity substrate input amplifier disclosed by the invention improves the anti-EMI performance of the circuit.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to an amplifier with anti-electromagnetic interference performance. Background technique [0002] In wearable smart electronic products, biomedical micro-nano devices, and implanted brain-computer interaction microcomputer systems, low-voltage and low-power amplifiers are the key. To meet the requirements of long battery life of the chip, it is necessary to design a low-voltage and low-power amplifier with good performance. In the current low-voltage amplifier technology, the substrate-input technology has been widely used in low-voltage designs due to its advantages such as wide input swing and suitability for working at extremely low voltages. [0003] However, the equivalent transconductance of substrate-input MOS transistors in conventional substrate-input amplifiers is usually much lower than that of gate-drive transistors under the same conditions, resulting in low cut-off ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/26H03F1/38H03F3/45
CPCH03F1/26H03F1/38H03F3/45179H03F2200/114H03F2200/372H03F2203/45116
Inventor 李洪革龚斯迪白会新
Owner BEIHANG UNIV
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