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An update for any future reference:
My HF oscillation seems to be due to power supply bypassing (lack thereof). I added small bypass caps as close to the power pins of each LF356 chips. The improvement in output is remarkable! See for yourself in the attached PDF. I didn't even optimize the...
Thank you both LvW and FvM. I will try the "gain of two" method.
Also probably should confess that in a haste to build the circuit (what I showed you is just a part of a slightly bigger circuit), I forgot to use supply bypass caps for all the ICs. In my next iteration, I'll definitely use them.
Clarification (sorry for not mentioning it in OP):
The plots that you see are not from simulation – they are measured waveforms from my circuit.
FvM – No, I didn't use different amps.
I have a problem with a simple LPF circuit. The circuit, input voltage and output voltages are shown in the attached PDF file. My designed LPF has a cutoff frequency of 10kHz. I input a 5kHz signal in it and measured it with a pair of wires (between ground and the output) which are connected to...
LvW --- I agree with you. Your suggestion would be more robust.
However, as FvM has pointed out, the NIC will not be much help for my situation.
FvM --- I'm not clear as to how a triax will help. Can you please elaborate on your suggestion. I'm assuming that the outer conductor of the triax...
mtwieg,
I am more concerned about the inter-wire capacitance than anything else. This will be high. Unfortunately, shielding for this will probably mean a metallic foil between the wires, right? This is almost but impossible because our wires are very thin (thinner than 36-gage). Do you know...
Hi,
We are trying to design a readout circuit for a capacitive sensor. The capacitive sensor itself is only a fraction of a pF and the changes in its capacitance due to some mechanical input is in the fF range. On top of these small values, two restrictions (no compromise) have been imposed on...
Hello,
I need to build a differential amplifier with a gain > 1. I know that the gain is equal to R_feedback / R_input (when resistors on the other leg are the same as this leg).
Let's say I need a gain of 10. So, I can use many sets of resistor-pairs: 10 ohm / 1 ohm, 10K/1K, 100K/10K etc...
I’m trying to build a circuit that I thought was going to be simple. So far, no luck. Here’s my problem:
I have a 1mA constant current source that I need to input into multiple strain gages to measure the resistance in 4-wire setup. I’ve tried using the ADG406 multiplexer. It doesn’t work. For...
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