Bandwidth-adjustable operational amplifier circuit

An operational amplifier and circuit technology, used in DC-coupled DC amplifiers, differential amplifiers, and improved amplifiers to expand bandwidth, etc., can solve problems such as increasing the operating current of operational amplifiers, reduce layout area, and reduce performance The effect of good stability

Active Publication Date: 2013-07-24
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This requires increasing the operating current of the op amp, and the contradiction between

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  • Bandwidth-adjustable operational amplifier circuit
  • Bandwidth-adjustable operational amplifier circuit
  • Bandwidth-adjustable operational amplifier circuit

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[0036] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail in conjunction with specific embodiments and with reference to the accompanying drawings.

[0037] Such as figure 1 As shown, figure 1 It is a schematic structural diagram of an operational amplifier circuit with adjustable bandwidth according to an embodiment of the present invention. The operational amplifier circuit includes a bias circuit, a fully differential operational amplifier main circuit, and a common mode feedback circuit. Among them, the bias circuit is used to provide a stable bias current independent of temperature and process for the main circuit of the fully differential operational amplifier and the common-mode feedback circuit; the main circuit of the fully differential operational amplifier is a two-stage amplified full swing output structure. To provide gain and required bandwidth under ...

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Abstract

The invention discloses a bandwidth-adjustable operational amplifier circuit. The operational amplifier circuit comprises a bias circuit, a fully differential operational amplifier main circuit and a common mode feedback circuit, wherein the bias circuit is used for providing stable bias current irrelevant to temperature and a process for the fully differential operational amplifier main circuit and the common mode feedback circuit; the fully differential operational amplifier main circuit is of a two-stage amplifying rail-to-rail output structure, and is used for providing gain and required bandwidth under the action of the bias current and outputting a common mode level to the common mode feedback circuit; and the common mode feedback circuit is used for stabilizing the common mode level output by the fully differential operational amplifier main circuit to a constant voltage. The bandwidth-adjustable operational amplifier circuit disclosed by the invention can be widely applied to radio frequency and analogue integrated circuits, such as active power filters, trans-impedance amplifiers and the like which need to work under various bandwidths. The bandwidth-adjustable operational amplifier circuit has the advantages that the power consumption is low, the integration level is high, the configuration is simple, and the working is stable, and adapts to various different load conditions.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to an operational amplifier circuit with adjustable bandwidth. Background technique [0002] Since the advent of integrated operational amplifiers in the 1960s, rapid development has been achieved. At first, it was mostly used for various analog signal operations, such as ratio, summation, difference, integration, differentiation, etc. With the development of technology, integrated operational amplifiers have been widely used in analog signal processing and generation circuits, and can be used to form active circuits. Unit modules commonly used in various radio frequency and analog integrated circuits such as source filters and transimpedance amplifiers. [0003] Compared with the single-ended output operational amplifier, the fully differential operational amplifier has a larger output voltage swing, is insensitive to common mode noise, and the output does not contain ...

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Application Information

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IPC IPC(8): H03F3/45H03F1/42
Inventor 武振宇刘欣黄水龙樊晓华张海英
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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