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February 11, 2013 AT 7:01 am

Op Amp Power Supplies: Split, Single, and Virtual Ground Designs

Another great video from my friend Alan Wolke, this time about op-amp power supply considerations. He explains the differences when using op-amps on a single supply, a split (or bipolar) supply, and with a virtual ground. He writes:

This video discusses the power supply considerations for op amps. It talks about split or dual power supply and single supply operation, and why the op amp often doesn’t care which you use! It shows how traditional op amps designed for split supply operation can be used in single supply applications. The most important consideration generally is taking care of where the input and output voltages are with respect to the supply rails. The input voltage and output voltage range specifications are examined in a datasheet. The operation of a op amp in a single supply application is examined on an oscilloscope. This operation is compared to a modern rail-to-rail op amp in the same circuit.

This answers a lot of questions which beginners have when first learning about opamps, and explains the reasons behind some opamp specs in an exceptionally clear manner. Check it out!

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2 Comments

  1. Great find! This will help me & my robotics team design amplification circuits for our hydrophones.

  2. Hey John – thanks for posting this in the blog. I can always tell when you do this – my view counts grow dramatically! I’m glad that folks are finding these videos helpful.

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