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Binary weighted linear-in-dB switch resistor type CMOS programmable gain amplifier

A technology of linear switching and programming gain, applied in amplifiers, gain control, amplification control, etc., can solve the problems of limited gain range and low gain accuracy, reduce the impact, save the use of decoders, and reduce resistance. effect used

Active Publication Date: 2016-07-06
TIANJIN UNIV
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Problems solved by technology

The PGA with an open-loop structure can achieve a limited gain range, and the gain accuracy is low

Method used

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  • Binary weighted linear-in-dB switch resistor type CMOS programmable gain amplifier
  • Binary weighted linear-in-dB switch resistor type CMOS programmable gain amplifier
  • Binary weighted linear-in-dB switch resistor type CMOS programmable gain amplifier

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Embodiment Construction

[0025] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the described specific embodiments are only for explaining the present invention, and are not intended to limit the present invention.

[0026] The invention is a binary weight dB linear switch resistance CMOS programmable gain amplifier, based on SMIC0.18umCMOS technology, its structure is as follows figure 2 As shown, it includes a fully differential operational amplifier and a feedback resistor array module; the fully differential operational amplifier includes a two-stage structure, a bias circuit and a common-mode feedback circuit, and the first stage in the two-stage structure is a telescopic common source Common gate structure, the second stage is the common source stage; cascode compensation technology is adopted to obtain sufficient phase margin and ensure the stability of the feedback loop.

[002...

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Abstract

The invention discloses a binary weighted linear-in-dB switch resistor type CMOS programmable gain amplifier. The programmable gain amplifier comprises a full differential operational amplifier and two feedback resistor arrays with the same structure. The full differential operational amplifier comprises two levels of structures, a biasing circuit and a common mode feedback circuit. A first level is a bushing type cascode structure; a second level is a common source level; the two feedback resistor arrays are respectively equipped with four gain control interfaces for adding same four-digit digital signals, thus controlling the gains of the two feedback resistor arrays; and the structures of the feedback resistor arrays comprise 16 feedback resistors and 15 single-pole double-throw switches. According to the gain amplifier provided by the invention, the programmable gain control of precise step length can be realized; use of a decoder is eliminated; through adoption of the single-pole double-throw switches, the switches of the same quantity can be connected in each way of signal pathway; the influences of the switches and resistors on the gain precision are reduced; use of the resistors is reduced; and the layout area of the chip is saved.

Description

technical field [0001] The invention adopts a resistance type feedback structure, controls the feedback resistance by a digital signal, realizes that the gain of the operational amplifier can be changed accurately and linearly in dB, and belongs to the field of variable gain amplifiers. Background technique [0002] In modern communication systems, digital mobile communication is widely used. The fading phenomenon is a characteristic of mobile communication in the signal propagation process. Due to the uncertain distance between the mobile terminal and the base station and the uncertain propagation path, the strength of the signal received by the receiver varies widely. In order to ensure the best working state of the analog-to-digital converter and demodulator, that is, the level they receive is stable, it is necessary to amplify and attenuate the received signal. The variable gain amplifier (Variable Gain Amplifier, VGA, hereinafter collectively referred to as VGA) is An ...

Claims

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Application Information

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IPC IPC(8): H03G3/30H03F1/34
CPCH03F1/342H03G3/30
Inventor 赵毅强王景帅
Owner TIANJIN UNIV
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