Linear programmable gain amplifier realized by switched capacitor

A technology of programming gain and switched capacitor circuits, which is applied in the direction of power amplifiers, etc., can solve problems such as low gain linearity, large DC offset, and stability of gain condition optimization, and achieve good gain linearity, high amplification accuracy, and reasonable gain distribution. Effect

Active Publication Date: 2015-05-20
西安翔腾微电子科技有限公司
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Problems solved by technology

[0004] Aiming at the problems that the traditional structure adopts the resistance ratio structure and cannot optimize its stability for different gain conditions, the gain linearity is low, and the DC offset is large. The present invention provides a linear programmable gain amplifier realized by switched capacitors, and proposes a three-stage Amplifier cascaded switched capacitor programmable gain amplifier, suitable for high-precision integrated circuit design with relatively high requirements for gain stability and gain linearity

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  • Linear programmable gain amplifier realized by switched capacitor

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[0025] The technical solutions of the present invention are clearly and completely described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are all Belong to the protection scope of the present invention.

[0026] Such as figure 1 As shown, a linear programmable gain amplifier implemented by a switched capacitor circuit includes sequentially connecting the first-stage amplifier circuit, the second-stage amplifier circuit, and the third-stage amplifier circuit; it also includes a non-overlapping clock generation circuit; the second-stage open The amplifier includes switch Φ21, switch Φ22, switch Φ23, switch Φ24, capacitor C21, capacitor C22, capacitor C23, capacitor C24, variable capacitor C2...

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Abstract

The invention provides a high-precision linear programmable gain amplifier circuit realized by adopting a CMOS switched capacitor circuit. The circuit comprises three-level amplifier structures, the first-level amplifier structure achieves high-precision fixed gain amplification, the second-level amplifier structure achieves high-linearity changeable gain amplification, and the third-level amplifier structure adopts a rail-to-rail operational amplifier to switch double ends to a single end, the output range of the circuit is enlarged, an active low-pass filter is integrated internally, signal noise is reduced, and stability is improved. As a three-level cascaded structure is adopted, gain distribution is facilitated, the gain linearity is improved, and the amplifier has the advantages that the response speed is high, the common-mode level range is wide, and detuning is automatically eliminated.

Description

technical field [0001] The invention belongs to the field of high-precision analog circuit design, and relates to a switched capacitor circuit, a high-precision linear programmable gain amplifier and the like. Background technique [0002] A traditional programmable gain amplifier needs to change the ratio of the resistance value of its feedback resistor to the input resistor to achieve variable gain. The change of the resistance will cause the change of the input and output impedances of the programmable gain amplifiers of various stages, thus reducing the stability of the entire cascaded programmable gain amplifiers. [0003] How to optimize the stability of cascaded programmable gain amplifiers with different gains and improve the gain linearity has become a problem worthy of attention. A programmable gain amplifier with a switched capacitor structure mainly adjusts the gain by changing the size of the sampling capacitor array, so there is no need to compensate the stabi...

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Application Information

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IPC IPC(8): H03F3/20
Inventor 刘敏侠韩炜王晋邵刚龙强蔡叶芳
Owner 西安翔腾微电子科技有限公司
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