Hi. Looking for some help and advice.
I have a circuit using an OP284 which is showing odd behaviour to a stepped input that transitions from 0V to -9V.
The trace below shows the behaviour.
Yellow is the output of OP284 CCT ref LG_U42 pin 7
Blue is is the output of OP284 CCT ref LG_U42 pin 1
The step is caused by changing channels on the MUX (ADG1408) that feeds the first Op-amp. The -9V is a voltage rail, as is the 0V. The rails into the mux do not show the noise that is present on the blue trace.
The implemented circuit is shown below.