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I want to get inverting and non inverting square wave at the same time. I am using EL2444 quad op amp, gain not required. My input is approx. 550 kHz, 50% duty cycle square wave. I assume that I will get the same output from non inverting op amp and inverted output from inverting op amp. But actually I am getting inverted output ok but non inverting output is differ, its duty factor was changed.

What should I do? Is there any problem in my circuit OR should I change op amp?

non inverting output - yellow trace is input

Fig.1: Non-inverting output (blue) and input (yellow)


Circuit2

Fig.2: Inverting output (blue) and input (yellow)


Circuit3

Fig.3: Circuit diagram


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  • \$\begingroup\$ You don't need to build a non-inverting amplifier with a gain of higher than unity. Instead, just build a buffer (remove R4, and short R3 or leave it as it is). Also, show your setup including the oscilloscope, signal source and overall circuit connections. \$\endgroup\$ Commented Jul 9 at 8:59

2 Answers 2

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U1.1 ( non inverting) has gain of 2, not 1. Remove R4 (make it infinite ♾️). Be careful: confirm that U1.1 is unity-gain stable for non-inverting gain of +1.

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  • \$\begingroup\$ It's unity gain stable upgraded version. \$\endgroup\$ Commented Jul 9 at 9:07
  • \$\begingroup\$ Thanks Fabio, It works now \$\endgroup\$
    – ksoni
    Commented Jul 9 at 9:33
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The Non inverting amplifier is overdriven, because its amplification A=2. Remove R4, so it will work as a buffer.

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  • \$\begingroup\$ Thanks dear. it works now \$\endgroup\$
    – ksoni
    Commented Jul 9 at 9:33

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