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关于Kinetis K系列16位ADC PGA的分析(英文)

更新时间:2023-01-09 08:51:14 大小:449K 上传用户:sun2152查看TA发布的资源 标签:kinetisadcpga 下载积分:1分 评价赚积分 (如何评价?) 打赏 收藏 评论(0) 举报

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1 Introduction Freescale's Kinetis microcontrollers integrate a 16-bit analogto-digital converter (ADC16) with built-in programmable gain amplifier (PGA), which is capable to operate in several modes. The Programmable Gain Amplifier (PGA) is designed to increase the dynamic range by amplifying low-amplitude signals before they are fed to the 16-bit ADC. 1.1 Abstract Whenever a gain stage is included in the converter path, the Signal to Noise Ratio (SNR) will go down. This effect occurs because the PGA induces noise into the system. Therefore, question may arise why would an application include PGA on the system? The main reason to include a PGA stage before an ADC conversion is to increase the dynamic range. Dynamic range indicates the minimum resolvable step size and the ratio between the largest and smallest possible inputs. Resolution is the number of bits in the result, and is often confused with dynamic range.

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