operational amplifier

Hi all. I have designed a PCB using the OPA4990IDR op amp in a comparator configuration. I have use the OPA as a unity gain buffer also before the comparators. The purpose of this PCB is to measure battery voltages of up to 10 Li-Ion cells (3.3V each , 38V MAX). I am having a problem tho...

Hello, I'm trying to design a folded cascode op amp as shown below. I need a high full power bandwidth, about 90 to 100MHz, and a high gain (>60dB). I reach the required gain but it's hard for me to have a large full power BDW, it doesn't exceed the 500KHz. From the theory, the frequency at...

Hello, I have a question about the PSRR and the noise in an op amp. Which configuration has the best PSRR? Is it the telescopic one or the folded cascode? I know that to improve PSRR, we need to have a high output resistance and symmetric architecture ( can someone pls tell me why symmetry...

Hello, I have a question regarding operational amplifiers. Whenever I search for some datasheets of high gain and high-speed Op Amps ( BW higher than 50MHz), I mostly find that they are made of bipolar transistors rather than mosfet. Why is it so? I've done some research and I've found that...

Hello, I'm trying to design an one stage OP AMP made of a differential pair, a current load and a current mirror as shown in the picture ( the first stage only, I didn't include Q7 Q6 and Compensation capacitance) I designed the circuit to have a gain of 100V/V, a slew rate of 2V/µs, aGWB...

I'm done getting crap output signals. I've tried to simulate about a dozen circuits with several operational amplifiers. Filters work fine, but SAH doesn't. I give up and asking you for help. There can I find tutorials about designing circuits with OP AMPs? Also, if you got a circuit, you are...

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...

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?

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...

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...