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The most likely issue would be the load on the output. The AD603 wasn’t designed for driving a 50Ω load so we usually try ...
你可以看如下数据手册的描述:
The AD603 can drive a load impedance as low as 100 Ω with low distortion. For a 500 Ω load in shunt with 5 pF, the total harmonic distortion for a ±1 V sinusoidal outpu ...