I can recommend an op amp with better EMI performance if I know some of the other requirements for your system. What bandwidth does the transimpedance amplifier need to achieve (also the photodiode capacitance will be needed) and is the OPA355 also used…
Other Parts Discussed in Thread: OPA355 The OPA355 datasheet has a of recommended Rs versus Cload. In my ignorance I do not understand the implications of this chart. I was hoping someone here could provide some insight.
The chart shows a smaller value…
Other Parts Discussed in Thread: OPA355 In the OPA355 datasheet there is a graph of gain flatness versus Rf. The graph indicates that the amp has more peaking with higher Rf. Why would this be? For most CFAs the opposite is true. Is this an error?
Other Parts Discussed in Thread: OPA355 , LMH6629 I am stumped. I have an OPA355 ckt configued with gain=+2. Rf=499ohms, Vs=+/-2.5V. I have done everything I can think of to minimize stray capacitance. The amp has plenty of decoupling capacitance.
The…
Other Parts Discussed in Thread: OPA355 Hello:
I have been tasked with designing a video switch (NTSC) (2 input 1 output for each circuit on each channel) with 8 channels on one board. I chose the OPA 355 with its nice enable pin that should greatly…
Other Parts Discussed in Thread: OPA355 Hello, I've used OPA355. I need to cut INPUT pulses in 4 useg , the enable pin is used for this purpose, but in the output appears a glitch when the OPA is enable again. How can I eliminate or attenuate this glitch…
Other Parts Discussed in Thread: OPA355 one of our customersis using ther OPA355 but unfortunately it is not good enough for my 0-2V 80MHz clipped sin wave signal…
can you recommend for similar OpAmp with same footprint (SOT23) to OPA355 but that…
Thomas;
The OPA355 should have enough bandwidth to see a 1MHz signal with no problem. There are ways that you can simplify and improve your circuit, however-- if you use the topology shown in my attached circuit, the photodiode will be reverse biased…
I have the following circuit
It is essentially a AC amplifier. I have a signal that is 500KHz and I am able to amplify even a few nA signals with good accuracy. The problem is the sun. When device is working outdoors, the photodiode (shown as…
Thomas;
You seem determined to measure the background illumination current, so here is a better way of doing that. It is necessary to provide a negative photodiode bias and there is some additional noise, but this circuit is simple and could employ…
