OPA1612: output of OPA1612is distorted

aggil liang

Part Number: OPA1612
Other Parts Discussed in Thread: OPA2134, LM4562

Dears

when we use opa1612 to translate difference input to single-ended output, the output is distorted, pls. help to check the reason. Below picture is the Sch , and the distorted waveform is attached vedio.

Anther, When we used opa2134 or lm4562 to replace opa1612, the distortion disappear.

over 7 years ago

0 Alexander Davis over 7 years ago

TI__Expert 6250 points

Hi Aggil,
I suspect that this is a stability problem. Is there any additional circuitry or load connected to the output of the OPA1612 in your circuit above? If I simulate your schematic above, the design appears to be stable, but additional capacitance on the output of the OPA1612 could make it unstable.

0 aggil liang over 7 years ago in reply to Alexander Davis

Expert 2660 points

Hi Alex
We testing using 10K ohm load, or capacitive load, it all are distorted. when we use 10ohm resistance to series to the output, useing the same load , the distorted is disappear. why ?

0 Marek Lis over 7 years ago in reply to aggil liang

TI__Guru 64290 points

Aggil,

Since one section of the circuit effects the other, please always show the entire schematic including the load.

To learn about the effect of the series output resistor on circuit stability, please view the video under following link:

0 aggil liang over 7 years ago in reply to Marek Lis

Expert 2660 points

hi Marek
thanks

Amplifiers

Amplifiers forum

OPA1612: output of OPA1612is distorted