--- title: "Specifying the Maximum Amplifier Noise When Driving an ADC" url: https://daily.dev/posts/specifying-the-maximum-amplifier-noise-when-driving-an-adc-vnj05srq5 source_url: https://www.embeddedrelated.com/showarticle/604/specifying-the-maximum-amplifier-noise-when-driving-an-adc type: article source: "EmbeddedRelated" published: 2026-05-31T07:48:31.904Z updated: 2026-05-31T09:26:41.126Z reading_time: 7 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Specifying the Maximum Amplifier Noise When Driving an ADC **[EmbeddedRelated](https://daily.dev/sources/embeddedrelated)** · 7 min read · 0 upvotes · 0 comments ## Summary When an analog signal requires amplification before reaching an ADC, the amplifier's inherent noise can degrade the ADC's output SNR. A compact rule quantifies the maximum allowable amplifier input-referred noise power: it must be less than (1 - 1/α²) times the ADC's quantization noise power (q²/12), where α is the voltage gain. For example, at α=2, the amplifier noise power must stay below 75% of the ADC's quantization noise power. A figure plotting this relationship across gain values helps engineers quickly select or specify an appropriate amplifier for a given gain requirement. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [So Many Analog To Digital Converters](https://daily.dev/posts/so-many-analog-to-digital-converters-4y2dmbxdr) · Hackaday · 0 upvotes · 0 comments --- [View this post on daily.dev](https://daily.dev/posts/specifying-the-maximum-amplifier-noise-when-driving-an-adc-vnj05srq5)