operational amplifier

  1. P

    OPA657 Op-Amp oscillating for unknown reasons

    Greetings, I am working on a Lidar system for a senior project and am running into issues I am unable to solve with my circuit. The project requires the use of an amplification and comparator circuit in order to take the detector output up to a level that will trigger a TDC controlled by a...
  2. alifaqil25

    What is the important of Gain Bandwidth of op amp

    Hello, I am required to design an active band pass filter and I needs to design it at high frequency around FM Radio frequency (>80MHz). Do the GBW of op amp needs to be selected accordingly to the required frequency or it does not matter? And what is GBW indicates actually?
  3. R

    DC biased opamp input resistor function

    http://www.generalguitargadgets.com/pdf/ggg_dist_plus_sc.pdf I'm looking to understand this schematic. Currently focussing on the input and power stages. Here's where I'm at: INPUT R1 is a pulldown resistor. It provides a path for the leakage current through C2 when the switch is in the...
  4. R

    Op-Amp Voltage Follower Outputs ~+Vcc when IN+ is 0V

    Hi all, I'm fairly new to working with operational amplifiers and so I'm just messing around with a few basic circuits. Had a comparator working fine to switch an LED on/off based on some variable reference voltage, but now I'm trying to get a working voltage follower. I have 2 different...