现代电子技术2024，Vol.47Issue(24)：8-12,5.DOI:10.16652/j.issn.1004-373x.2024.24.002
一种高性能数控VGA设计
Design of high-performance digital control VGA
摘要
Abstract
In order to meet the requirements of high-speed and high-sensitivity receivers,a new type of high-performance digital control variable gain amplifier(VGA)is designed.The circuit mainly includes the preamplifier,gain transconductance unit,and output amplifier.The preamplifier picks high-gain or low-gain mode by means of the most significant bit(MSB)of the 8-bit gain control word.The remaining 7-bit gain control word can realize the gain adjustment range of 45 dB.By utilizing the high cutoff frequency and low harmonic characteristics of SiGe BiCMOS technology,the high linearity is designed and implemented by combining with negative feedback method.The transconductance unit based on current steering structure is designed to realize the wide gain adjustment range by combining with a broadband transimpedance amplifier.The simulation experiments were conducted by means of Cadence software,two gain adjustment ranges of-25～20 dB and-11～34 dB were realized after chip verification,as well as a high-performance digital control VGA with 35.23 dBm OIP3.The designed VGA can be used in front-end circuits of receiver such as intermediate frequency sampling receivers,IF/RF frequency gain stages,and differential analog-to-digital converter(ADC)drivers.关键词
可变增益放大器/数控/增益控制/跨导增益/前置放大器/高线性度/最高有效位Key words
variable gain amplifier/digital control/gain control/transconductance gain/preamplifier/high linearity/most significant bit分类
电子信息工程引用本文复制引用
张瑜,俞阳,蒋颖丹,吴舒桐,魏敬和..一种高性能数控VGA设计[J].现代电子技术,2024,47(24):8-12,5.基金项目
江苏省自然科学基金项目(BK20211041) （BK20211041）
