Super informative and useful. I hadn’t expected the zero-crossing distortion, nor the wild shifts in offset voltage with common mode voltage. I’m a new subscriber, and filing this video away for reference, thanks!
Thank you. I am puzzled. On an MCP6002 rail to rail output amp using a differential amp with four 10K resistors, I can only get to 1.3v from rail (4.3vdc supply to get 3 volt output). I a m using a voltage ramp from 0-3vdc into 10K on + input. The output follows until within 1.3vdc of supply, then flattens. Just what I would expect with LM358 but not the rail to rail MCP6002. Can anyone tell me what is wrong with my thinking? BTW, I used SPICE of MCP 6002 with my circuit and it says it should work??? I tried with three MCP6002 chips with same result? In any case, thanks. Very good video.
Hi. Thanks for the comment. It’s sounds like it should work. What is the load on the output? Have you checked your 4.3v supply voltage to see that it’s not dipping during the positive peak?
@@oldhackee3915Thanks for reply. This is my first rail-rail project, so I did a SPICE model with MCP6002 (1/2) and it worked for 3v out with 3.3vdc supply. Then I built the circuit (and tried 3 different MCP6002 DIPs). The circuit clipped at 2v with 3.3 supply and stopped clipping when supply was raised to 4.3vdc (1.3vdc head room). That would be expected with bipolar push-pull out put but not CMOS output stage. They are cheap chips from China (so???). At this time, I am not loading the output beyond the scope probe and 10K FB resistor. It seems like bad parts, but I could be doing something wrong (but what??). Thanks for your advise, Doug.👍
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Super informative and useful. I hadn’t expected the zero-crossing distortion, nor the wild shifts in offset voltage with common mode voltage. I’m a new subscriber, and filing this video away for reference, thanks!
Thanks for the comment. I’m glad you found it useful.
Nice informative post and catchy animations ! looking forward to more analog posts
Thanks very much.
I learned a lot from this video. Thanks.
Thanks so much.
information welcomed thank you
Thank you.
Thank you. I am puzzled. On an MCP6002 rail to rail output amp using a differential amp with four 10K resistors, I can only get to 1.3v from rail (4.3vdc supply to get 3 volt output). I a m using a voltage ramp from 0-3vdc into 10K on + input. The output follows until within 1.3vdc of supply, then flattens. Just what I would expect with LM358 but not the rail to rail MCP6002. Can anyone tell me what is wrong with my thinking? BTW, I used SPICE of MCP 6002 with my circuit and it says it should work??? I tried with three MCP6002 chips with same result? In any case, thanks. Very good video.
Hi. Thanks for the comment. It’s sounds like it should work. What is the load on the output? Have you checked your 4.3v supply voltage to see that it’s not dipping during the positive peak?
@@oldhackee3915Thanks for reply. This is my first rail-rail project, so I did a SPICE model with MCP6002 (1/2) and it worked for 3v out with 3.3vdc supply. Then I built the circuit (and tried 3 different MCP6002 DIPs). The circuit clipped at 2v with 3.3 supply and stopped clipping when supply was raised to 4.3vdc (1.3vdc head room). That would be expected with bipolar push-pull out put but not CMOS output stage. They are cheap chips from China (so???). At this time, I am not loading the output beyond the scope probe and 10K FB resistor. It seems like bad parts, but I could be doing something wrong (but what??). Thanks for your advise, Doug.👍