During phase B, how can the amp B measure the offset voltage at the input of amp A?. The offset voltages are internal and can only be measured at output right?
First of all, we don't deserve you at all. Thank you for all your good teaching. When I was 22 or so in the early 80s I worked for an outfit as a test tech that made discrete precision DC amps that had a chopper amp for offset null. To this good day I didn't really get it. It wasn't a requirement of us to understand the theory of operation but just to use the prescribed testing methods to get them out the door. As I recall, they measured strain gauges om missiles in silos in at least one application.
There's something i do not understand… In Phase B, op-amp B is nulling-out op-amp A using it's own nulling voltage. What happens if op-amps B and A have different internal offset voltages ???
Dear EEVblog, Might I ask some small questions about the phase B?1. It's that Input is always connecting to the output through main Amplifier A. So, in phase B, what stored in C2 might be not only the Vos of main Amplifier A but also with the Input Voltage??? 2. Or only the lower frequency Input might have the chance to be stored in C2??? Because for high frequency(HF) input, C2 works as short circuit and pass the HF input without attenuation.3. So the input signal must be AC signal (chopped DC signal) in this case?Best regards and really look forward to your instruction and recommendationYour tutorial saves my shallowed experience, and really thank you very much!!!
This might be the oldest eevblog video I've watched that has taught me something useful!
Didn't know I'd learn something this useful from a video that was made when I was 4 years old 😃
What causes offset voltage anyway?
Hi I loved the removable switches ! From closed to open very graphic.
ancient video but still the best i found
Super cool video. I have learned a lot from you and your videos. Thank you!
is this how you zero DC clamps for example?
Thank you very much….
During phase B, how can the amp B measure the offset voltage at the input of amp A?. The offset voltages are internal and can only be measured at output right?
First of all, we don't deserve you at all. Thank you for all your good teaching. When I was 22 or so in the early 80s I worked for an outfit as a test tech that made discrete precision DC amps that had a chopper amp for offset null. To this good day I didn't really get it. It wasn't a requirement of us to understand the theory of operation but just to use the prescribed testing methods to get them out the door. As I recall, they measured strain gauges om missiles in silos in at least one application.
Thanks for the video….
There's something i do not understand… In Phase B, op-amp B is nulling-out op-amp A using it's own nulling voltage. What happens if op-amps B and A have different internal offset voltages ???
Thanks.
6.16 "its magic" lol
I cant believe I only started watching your videos recently. I should have been doing this years ago. Thanks!
Dear EEVblog, Might I ask some small questions about the phase B?1. It's that Input is always connecting to the output through main Amplifier A. So, in phase B, what stored in C2 might be not only the Vos of main Amplifier A but also with the Input Voltage??? 2. Or only the lower frequency Input might have the chance to be stored in C2??? Because for high frequency(HF) input, C2 works as short circuit and pass the HF input without attenuation.3. So the input signal must be AC signal (chopped DC signal) in this case?Best regards and really look forward to your instruction and recommendationYour tutorial saves my shallowed experience, and really thank you very much!!!
Chopping is different from auto zero techniques.
in german: ZERHACKER OPERATIONSVERSTÄRKER
This was really helpful…my concepts became clear..thankyou
You are so quiet in the video
Watching all of them 🙂
Thanks
I love OP Amps.