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| Why is this circuit's transient response settling twice |
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| nikola22:
currently working on an improved Howland Current Source Architecture that I have built using this schematic. (R1=R2=R3=R4=10k & R5 = 10). configured with a gain of 1 and a transfer function of Io = Vin/R5 However, in the lab I am noticing an odd behavior with my transient response. It is actually settling twice! Instead of using a BJT as a current buffer I am using the TCA0372 as a voltage buffer. (https://www.onsemi.com/pub/Collateral/TCA0372-D.PDF). Would someone please be able to explain why I am seeing this transient response? Where this circuit is apparently settling twice? The yellow trace is VL and the Orange Trace is Iout. The input is a 0 to -300mV step input voltage. Appreciate any help! The supply voltages are +/-12V. The load is either a resistive box of 85 ohms, or 85 ohms and 150mH. |
| Jay_Diddy_B:
Hi, What is the load? Those waveforms are consistent with an inductive load. Try a resistive load. Jay_Diddy_B |
| nikola22:
This photo was taken with an inductive load, but I believe I noticed the same behavior with my resistive load testing. |
| T3sl4co1l:
What supply voltages? What does the intermediate node (op-amp output / buffer input) look like? Tim |
| nikola22:
The supply voltages are +/-12V. The load is either a resistive box of 85 ohms, or 85 ohms and 150mH. Here are waveforms from the non-inverting input terminal and the output of the buffer and the intermediate node. |
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