HI Alex,
ECG/EEG applications typically require very low noise in the low frequency range, or very low 1/f /flicker noise.
Chopper amplifiers offer no 1/f noise, however, the input bias current is higher on chopper amplifiers when compared to other traditional…
Part Number: ADS8691 Other Parts Discussed in Thread: OPA141 , Dear All,
My last problem was solved with your help. Thanks again.
When the ADC input test was performed based on the completed code, it was found that the converted value was abnormal when…
Hey JC,
Thanks for your response, I hear you, and understand what you are saying. However a SPICE model is a SPICE model, the underlying simulation engine is the same. Other models from TI (such as the newly release OPA1611) run just fine in the same…
Other Parts Discussed in Thread: OPA134 , OPA211 , OPA172 , OPA1688 , OPA209 , OPA1611 , OPA320 , OPA141 , OPA140 Hello,
I'm looking for a low input noise voltage amplifier to amplify a really small voltage signal(2uV). I'm also looking for a good current…
Hi Brendon,
The OPA2171 does have back-to-back protection diodes across the inputs. That would explain the current path between the inputs. The voltage drop across R18 isn't equal to the drop of R17 so some of the input current flowing through R18 is…
Other Parts Discussed in Thread: OPA170 , TINA-TI , OPA141 Hello, all
Now we are trying to have measurement on input offset voltage on each OpAMPs.
The n would like to know about the method of this measurement.
When referring 11-8 and 11-9 of "Chapter 11…
Nilton,
Although OPA141 works down on +/-2.25V supply voltage, the linear range of the input common-mode voltage is: (V-)-0.1V < Vcm< (V+)-3.5V . Therefore, operating OPA141 on +/-2.5V with the input at the ground potential violates the input voltage…
Lyman,
The voltage noise is not changing when the 10M resistor is connected from input to GND but input current noise does change from 2fA to 40fA/rt-Hz). If you want to see the thermal noise increasing due to addition of 10M resistor, it must be connected…
Ryuji,
OPA1652 and OPA2171 are CMOS op amps and as such they do NOT exhibit popcorn noise. OPA2140 has a JFET input differential pair but bipolar active load which may be prone to popcorn noise - for this reason entire OPAx140 and OPA141 families of op…
Other Parts Discussed in Thread: OPA1604 , OPA1641 , OPA141 , OPA140 For OPA1641, I don't see the offset drift temperature coefficient (uV/deg C) in the data sheet. Also, the settling time (eg., 16 bit, 0.0015%) is missing. It would be helpful to know these…