Low-noise operational amplifier circuit

An operational amplifier and amplifier circuit technology, applied in low noise amplifiers, amplifiers, DC-coupled DC amplifiers, etc., can solve problems such as the inability of circuit noise characteristics to meet requirements, reduce offset voltage and temperature drift, and improve output swing. , the effect of increasing the input impedance

Pending Publication Date: 2022-02-18
XIAN MICROELECTRONICS TECH INST
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Problems solved by technology

[0003] In summary, the noise characteristics of the circuits in the prior art c...

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Embodiment Construction

[0047] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0048] The invention provides a low-noise operational amplifier circuit, which includes a start-up and bias circuit and an amplifier, and the amplifier includes an input stage circuit, an intermediate stage circuit and an output stage circuit.

[0049] The input stage circuit adopts a differential pair tube structure to increase input impedance, reduce offset voltage and temperature drift, establish a good matching DC operating point, and complete input voltage buffering and primary amplification; the intermediate stage circuit adopts a folded common-base-level common-emitter structure. Increase the voltage gain and output swing; the output stage circuit adopts the triode with the same parameters to output in the form of push-pull to expand the internal current, improve the drive capability of...

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Abstract

The invention discloses a low-noise operational amplifier circuit. The low-noise operational amplifier circuit comprises an amplifier circuit, and an amplifier comprises an input-stage circuit, an intermediate-stage circuit and an output-stage circuit. The input stage circuit adopts a differential pair transistor structure to improve input impedance, reduce offset voltage and temperature drift, establish a good matching direct current working point and finish buffering and first stage amplification of input voltage; the intermediate-stage circuit adopts a folding common-base-stage common-emitter-stage structure to improve voltage gain and output swing; the output-stage circuit adopts triodes with the same parameters to output in a push-pull manner to expand internal current, so that the post-stage driving capability is improved, and the output swing is increased. According to the invention, the input voltage noise is optimized by changing the size of the resistor, and the polycrystalline silicon trimming replaces the laser trimming of the metal film resistor, so that the characteristic of high precision of the circuit is realized. According to the circuit structure, the noise performance can be improved, and the circuit structure can be compatible with an existing anti-radiation standard bipolar process.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, in particular to a low-noise operational amplifier circuit. Background technique [0002] Operational amplifiers can be found everywhere in today's circuit systems, and designers always hope to design operational amplifiers with excellent performance in all aspects, such as high gain, large output swing, high current drive capability, low power consumption, etc. " "Almighty" operational amplifier, but in fact such an ideal operational amplifier is difficult to realize. The various indicators of the operational amplifier are interdependent and contradictory. If the operational amplifier has a small noise voltage, the noise current or power consumption may be sacrificed. Therefore, according to different application requirements, the operational amplifiers designed today have special features. dedicated performance. [0003] To sum up, the noise characteristics of the circuit in the p...

Claims

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Application Information

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IPC IPC(8): H03F1/26H03F1/30H03F3/45
CPCH03F1/26H03F1/302H03F3/4508H03F2200/294H03F2200/447
Inventor 兰蕾魏海龙
Owner XIAN MICROELECTRONICS TECH INST
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