Recent content by Kakeh

yes if you see the output its not limited to diode voltage but to 2.5V which is saturation of opamp

please find the LTspice file, i tired of of putting a series resistor with diode which made it work as like there is no diode,

Problem: my photo diode receives pulses of width 10ns-150ns and repeating at rate of 1Hz-50KHz the current from photo diode depending on incident light can go from 10nA-100mA, in a nutshell, my application tries to digitalize the analog pulses for pulse width measurement so i have 'only' two...

Problem: my photo diode receives pulses of width 10ns-150ns and repeating at rate of 1Hz-50KHz the current from photo diode depending on incident light can go from 10nA-100mA, so i have two photo diodes to cover the dynamic range, what i want to do is limit the current from a photo diode to...

thanks for the diode based approach, i would try it, i have tried in LTspice which gave me oscillations from the opamp output, here i also want to know what are risks if i use a very low reference voltage of 1mV with my comparator, is that risky to with low reference voltage with comparators ?

i was been seriously thinking about this past few days, but when tried i was failed for log amps being very slow, but i have seen few LVAs which stopped my heart beat costing around 1500$ which made me to think there is something wrong with log amplifiers, ns response time log amplifiers are no...

which is the noise at high frequency where i operate, i think i should consider this itself, is there any reason to ignore it, as you are saying however ?! i really doubt how would one interface FETs at input of an opamp, obviously like the link i have attached in my answer speaking on bobs...

Find Pg.8 and Pg.9 of the datasheet only few datasheets show this, fortunately they have shown what happens at high frequency, iam operating at 10ns pulse which is 100M

Problem Statement: my aim is to digitalize a 10ns narrow pulse coming from a photo diode with current ranging from 10nA-70mA, as its impossible to cover this dynamic range of >60dB using a single TIA i have an option of separating it to two channels as below using two diodes ofcourse Lowest...