高增益範圍CMOS可變增益放大器之設計

Designs of CMOS Variable Gain Amplifiers for Wide-Gain-Range Applications

王林森(Lin-Sen Wang)

指導教授 ： 呂良鴻

國立臺灣大學/電機資訊學院/電子工程學研究所/碩士(2017年)

https://doi.org/10.6342/NTU201702051

摘要

本論文針對可程式化增益放大器（Programmable Gain Amplifier, PGA）與可變增益放大器（Variable Gain Amplifier, VGA）提出了幾種增益控制機制。在RF無線接收端，需要一個精確的分貝線性VGA或PGA，將接收訊號的動態範圍，轉換至類比轉數位轉換器可接受的範圍。為了得到較寬的增益範圍，新提出的PGA及VGA分別採用了串接及增益移動的技巧。本論文中也討論且分析了幾種可變增益放大器的架構，以及近似指數函數。為了比較兩個不同架構，PGA與VGA以0.18-μm互補式金屬氧化物半導體製程製作，包含串接與單級兩種架構。串接的PGA可以得到較佳的增益誤差特性，而單級的VGA則可以提供較佳的面積與功率效能。

關鍵字

可變增益放大器 ； 高增益範圍

並列摘要

Several gain control mechanisms for the design of programmable gain amplifier (PGA) and variable gain amplifier (VGA) are presented in this thesis. In RF wireless receivers, an accurate decibel (dB)-linear PGA or VGA is required to convert the dynamic range of received signal into an acceptable range for the analog-to-digital converter (ADC). Several variable gain amplifier architectures and exponential-approximation functions are discussed and analyzed in this thesis. In order to obtain a wide dB-linear gain range, a cascading gain-error-shifting and a single-stage gain-shifting technique are proposed and adopted in the PGA and VGA, respectively. Both PGA and VGA are fabricated in the 0.18-μm CMOS process for comparison. The cascading PGA can achieve a small gain error characteristic, while the single-stage VGA can provide a better area and power performance.

並列關鍵字

Variable Gain Amplifiers ； Wide-Gain-Range

參考文獻

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