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And I think you're right. You can see that doing this stuff is not my usual line of work. The AD7171 has an analog differential input and here I was treating it as digital (or, rather, trying to). In any event as FvM points out, with the single positive supply you can't input a negative signal...
I'm using a TI LMP7721 3-femtoamp bias current op amp to measure an extremely small current in an ion cell. I have it in inverting mode with a guard around the input, driven to follow the non-inverting input voltage. This works extremely well and gives me an output between +/-5V.
After some...
Sunny I really appreciate your detailed reply. I like Microchip a lot and might accept the the slower sample rate - at least for my prototype - once I see the net level of noise I am contending with and whether I am getting the needed performance: then I can know if I must go more exotic - and...
Sunny and SvM thanks for your inputs - FVM: your suggestion is then to use a 24b and throw away the LSB? Sunny:SNR is a huge obsession in this project but I am lucky in having a very low frequency signal.
Klaus: Thank you for your suggestion - in fact I already bought this chip only to discover...
I'm designing a portable instrument (a gas chromatograph) which outputs a +5V analog signal (referenced to ground) which I need to digitize to 16 bits resolution. I need a conversion rate of at least 100 sps and preferably an SPI interface. Most of these requirements are easily met but with...
Thanks FvM - I made a SWR bridge with striplines on a PCB and it works well (if I can make sense of the readings).
I tried the pi arrangement but couldn't get the lamp to start so then I coupled the above oscillator to via two cascaded series resonant circuits and thence, via a 10cm...
Thanks for replying FvM. At this level of power as well as the configuration I'm on my own - the lamp works well when coupled via a single connected (ungrounded) coil and it also works through the coax with the same single coil but with less efficiency and less reliable starting.
The intention...
I have a simple oscillator that runs on +/-10V and sits inside a grounded metal housing. The oscillator puts out around 4W at 100MHz and I want to transfer that power as efficiently as possible, through a short coax, to another metal housing where there is an electrodeless lamp that runs on this...
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