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バックナンバー

2017
1967
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アナログ・デバイセズに寄せられた珍問/難問集

アンプのRF(帰還抵抗): 選ぶ前に考えよう!

私のシステムにはゲインの大きなアンプが必要ですが、これには大きなフィードバック抵抗を使えば良いのでし ょうか?

回答:

StudentZone

Grounding and Decoupling: Learn Basics Now and Save Yourself Much Grief Later! Part 2: Decoupling

In the last article, we highlighted the importance of maintaining a low impedance ground plane to provide a path for digital and analog return currents. This article discusses the equally important and related topic of power supply decoupling to maintain low impedances at the points where power enters the integrated circuit (IC).

Analog integrated circuits such as amplifiers and converters have at least two or more power supply pins. In the case of single-supply devices, one of the pins is usually connected to the ground. Mixed-signal devices such as ADCs and DACs can have an analog and digital supply voltage, as well as an I/O voltage. Digital ICs such as FPGAs can also have multiple power supply voltages, such as core voltage, memory voltage, and I/O voltage. Read more ...