Other Parts Discussed in Thread: OPA381 , OPA830 , TS5A3160 , OPA333 Hi,
I'm using an OPA381 as the first stage of a pulse oximeter amplifier similar to the circuit in this app note SPRAB37 and shown below. Its output goes unstable as I increase LED brightness…
Other Parts Discussed in Thread: THS4021 , OPA830 I have a very simple circuit.
Comparator, 9V single supply, Vinput = 0..3V square signal, Tr,Tf < 100ns.
see below
The output has an overshoot of 0.5V and a "drop" down to 1V on the rising edge…