Hi, I am using op amps with a single 5V supply. I would like to create a Vcom supply at 2.5V. Is there a recommended way to have a high quality half supply referenced from the 5V supply?
Yes, use another op Amp to make a follower (output directly connected to inverting input) and reference the non-inverting input to 1/2 supply with a pair of resistors. You can add a one (0.1 uF) capacitor from ground to the output of the follower and another capacitor from ground to non-inverting input (0.01uF) for added stability.Hi, I am using op amps with a single 5V supply. I would like to create a Vcom supply at 2.5V. Is there a recommended way to have a high quality half supply referenced from the 5V supply?
Note that some op amps can oscillate with a capacitive load. You may have to add a small resistor in series with the op amp output and any added output capacitor to insure stability.Yes, use another op Amp to make a follower (output directly connected to inverting input) and reference the non-inverting input to 1/2 supply with a pair of resistors. You can add a one (0.1 uF) capacitor from ground to the output of the follower and another capacitor from ground to non-inverting input (0.01uF) for added stability.
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20mA is safer. If you need more current, you can drive an NPN transistor from the OP AMP. If you're not using a rail to rail OA, you won't have much head room.[snip] do not exceed the op amps current rating on this reference (30 mA is common, check the datasheet)
Neat idea. Albeit, not one that I'd be inclined to use...TLE2426 is a precision virtual ground for creating a slit supply.
You could use TI TLE2426, it will track the supply and give a half rail, I've used it a lot...PeterHi, I am using op amps with a single 5V supply. I would like to create a Vcom supply at 2.5V. Is there a recommended way to have a high quality half supply referenced from the 5V supply?
by Aaron Carman
by Jake Hertz
by Jake Hertz
by Aaron Carman