Programmable gain amplification circuit and programmable gain amplifier

A technology for programming gain and amplifying circuits, which is applied in differential amplifiers, DC-coupled DC amplifiers, and improved amplifiers to reduce nonlinear distortion. to achieve the effect of large gain adjustment range, large gain adjustment range, and high linearity

Active Publication Date: 2013-04-17
锐立平芯微电子(广州)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the present invention provides an amplifier circuit and an amplifier applied to the receiving end of a communication system to solve the probl

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  • Programmable gain amplification circuit and programmable gain amplifier
  • Programmable gain amplification circuit and programmable gain amplifier
  • Programmable gain amplification circuit and programmable gain amplifier

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Embodiment Construction

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0033] The embodiment of the invention discloses a programmable gain amplifying circuit and a programmable gain amplifier. The programmable gain amplifying circuit has a fully differential circuit structure and adopts a degenerate source and common source amplifying circuit structure, thereby improving linearity. The amplifying circuit forms a closed-loop feedback structure, the gain depends on the ratio of the feedback resistance to the source degeneracy resis...

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Abstract

The invention provides a programmable gain amplification circuit and a programmable gain amplifier. The programmable gain amplification circuit is of a symmetrical fully-differential circuit structure and comprises two differential branch circuits of the same structure, each differential branch circuit respectively comprises a differential input stage connected with a common source structure of a signal input end and a differential output stage connected with a common source structure of a signal output end, and a switching capacitor array is connected between the differential input stage and the differential output stage and connected with a feedback resistor to form a closed loop feedback circuit. The differential input stage of one differential branch circuit is connected with the differential input stage of the other differential branch circuit through a switching resistor array to form a source degeneracy structure. The programmable gain amplifier comprises a plurality of programmable gain amplification circuits connected through an alternating current coupling mode and an output buffer stage applied to a receiving end. The programmable gain amplifier can provide a large gain regulation range and can meet requirements of linearity and bandwidth.

Description

technical field [0001] The invention relates to the technical field of integrated circuit design, and more specifically relates to a programmable gain amplifier circuit and a programmable gain amplifier. Background technique [0002] With the development of communication technology, wireless communication has entered the era of high-speed data transmission, wider frequency band will effectively improve the efficiency of data transmission, so ultra-wideband communication technology has become the focus of research in wireless communication systems. [0003] The receiver in the wireless communication system is a device that works at the destination end of the communication link to receive the signal and process or convert it for local use. In the communication system, the received signal is demodulated through the radio frequency front end of the receiver. The radio frequency front-end generally includes basic components such as a programmable gain amplifier, a filter, or a ba...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03F1/32
Inventor 刘欣张海英
Owner 锐立平芯微电子(广州)有限责任公司
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