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基于CMOS工藝的自動(dòng)增益控制電路研究
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(新疆工業(yè)職業(yè)技術(shù)學(xué)院 能源與電氣工程系,烏魯木齊 830022)

作者簡(jiǎn)介:

梁 娟(1982-),女,甘肅人,研究生,新疆工業(yè)職業(yè)技術(shù)學(xué)院,電氣講師,主要從事電氣自動(dòng)化、電子信息方向的研究。 [FQ)]

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Research on Automatic Gain Control Circuit based on CMOS Process
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(Department of Energy and Electrical Engineering&XinJiang Industrial Vocational and Technical College, Urumqi 830022,China)

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    摘要:

    在無(wú)線(xiàn)接收機中,天線(xiàn)接收的信號強度往往變化很大,自動(dòng)增益控制環(huán)路(automatic gain control,AGC)根據這個(gè)信號強度來(lái)動(dòng)態(tài)調節控制放大器的增益,向后級基帶電路(如ADC)提供幅度恒定的信號,使得接受到的不同強度信號均能被正確接收和解調;為了達到通過(guò)識別接收機接收信號的強度動(dòng)態(tài)調節放大器的增益,以實(shí)現輸出信號幅度恒定的目的,文章基于TSMC90nm CMOS工藝著(zhù)重論述了針對70 MHz中頻信號的AGC電路設計過(guò)程,詳細設計了AGC各模塊電路,并從提高線(xiàn)性度、降低直流失調和提高穩定性等方面對電路進(jìn)行了優(yōu)化,主要介紹AGC芯片的版圖設計并進(jìn)行了后仿,給出了整個(gè)AGC系統的工作特性和各項指標;在電路設計過(guò)程中,針對線(xiàn)性度、輸出信號幅度、增益控制范圍等進(jìn)行改進(jìn)與優(yōu)化,得到符合設計指標的電路結構;最后對AGC環(huán)路的性能進(jìn)行仿真驗證,得到該AGC在滿(mǎn)足輸出信號幅度和線(xiàn)性度的基礎上達到了30 dB的動(dòng)態(tài)范圍,滿(mǎn)足了接收機系統的要求。

    Abstract:

    In the wireless receiver, antenna receiving signal strength tend to vary greatly, automatic gain control loop (Automatic Gain Control, AGC) according to the signal strength to dynamically control the gain of the amplifier, backward level baseband circuit (such as ADC) to provide a constant amplitude signal, the different intensity of received signal can be received correctly and demodulation. In order to achieve the dynamic adjustment of the amplifier strength of the signal received by the receiver gain recognition, in order to achieve the output signal amplitude is constant, this paper focuses on the TSMC90nm CMOS process for AGC circuit design process of 70 MHz intermediate frequency signal based on the detailed design of the AGC circuit of each module, and in order to improve the linearity, reduce the DC offset and improve the stability. To optimize the circuit layout design, mainly introduces the AGC chip and the imitation, and gives the characteristics and indexes of AGC system. In the circuit design process, the linearity, the output signal amplitude and the gain control range are improved and optimized. Finally, the performance of the AGC loop is verified by simulation, and the dynamic range of the AGC is achieved on the basis of the output signal amplitude and linearity, which meets the requirements of the 30 dB system.

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引用本文

梁娟.基于CMOS工藝的自動(dòng)增益控制電路研究計算機測量與控制[J].,2017,25(7):264-268.

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歷史
  • 收稿日期:2017-03-13
  • 最后修改日期:2017-03-31
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  • 在線(xiàn)發(fā)布日期: 2017-08-10
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