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I have a circuit measuring the response of a photoreceiver as follows
The photoreceiver can be modeled as a current source and a shunt capacitor (I1 and C1). When I shine a square wave light pulse on the photoreceiver, The output Vout has obvious overshoot on the rising edge, and deep under...
It is around 100kHz (maybe a little less), but is larger than 20kHz
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I wanted Bessel filter to preserve the signal shape in time domain. The order of filter is not that important (>=2 is probably fine). 8-th order was just the order of LT1164-5 I referenced above.
For this anti-aliasing filter, I need Bessel type. The closest one I find by now is LT1164-5 8th order Bessel filter, with maximum cut-off frequency of 20kHz. But I wish I could push it up to at least 100kHz since my ADC can run much faster than 20kHz. Does anyone have any recommendation?
I need a sine wave signal for my circuit, and frequency is in the 100Hz to 5kHz range. I don't need very high output voltage/power, but the phase noise should be low. I check the frequency synthesizer ICs from the major manufacturers, but their frequency is always too high for me (hundreds of...
I am just wondering how to use lock-in amplifier to measure the 1/f noise spectrum of a device or an amplifier (there may be other ways but I am interested in how to apply lock-in principles in this case). Some people did something similar but they didn't show how exactly they were doing it...
I have a device which can be modeled with a resistor in parallel with a capacitor. Now I want to measure its resistance and capacitance as a function of voltage bias (from -2V to 2V) and frequency (from DC to 10kHz). Originally I was thinking of using a LCR meter such as handheld Agilent U1732C...
I am trying to measure low-frequency noise such as 1/f noise spectrum from a material.
I saw some people applied a DC current source, took the voltage across the material and amplified it with a preamp before it went into a FFT spectrum analyzer.
But the problem is the noise is relatively...
I have an "intuitive" method of measuring a high dynamic range current decay, but I am not sure whether it is the right way of doing it. The problem is described as follows:
I would like to see a current decay from a photodiode with a high dynamic range. By saying "high dynamic range", I mean...
Thanks for your detailed reply. Yes, it seems that a decoupling capacitor will do the work.
Now I need to get such a capacitor. It needs to be low-noise and low leakage, since the AC signal is very small (only tens of uV). Do you have any suggestion? Thanks.
Sorry, it should be "uF" not "uC". I have corrected the typo in the post.
The DC value is supposed to be constant, although in real life there may be some drift in a time scale that is much longer than the measurement time.
There should be 50 Ohm source impedance to the amplifier, and the...
I need to amplify a time dependent signal which has a large DC background (at least 100 times larger than the signal amplitude). So I think I need something to filter out the DC background. A big capacitor can do this. But at the same time I also see something called DC block. I notice that most...
In my case the signal is not just 100MHz. It extends all down to very low frequency. So a bandpass filter may not be an ideal solution. But thanks for your reply.
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Thanks. Can you please recommend some LNAs that are applicable in this case?
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