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Self-oscillation in a commercial RF amplifier

I purchased several 50 ohm (in/out), 35 dB gain photomultiplier tube (PMT) amplifiers from a vendor assuming I could use them to read out the voltages on my PMTs. The amplifiers are AC coupled with a ...
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204 views

LDO Regulator Overshoot

I'm using an LP38691 3.3V fixed regulator which is overshooting. This wasn't an issue for years, but now a component is being replaced and the current on the 3.3V rail has gone up from 300mA to 500mA. ...
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66 views

Failing to stabilize voltage

I need advice on stabilizing a voltage source. I've read some articles and threads on this, but with voltage stabilization the solution seems to vary very widely depending on the concrete problem. I ...
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27 views

How to determine the stability from Nyquist plot for Minimum and Non-Minimum Phase system?

For a non-minimum phase system there are some zeros that are in the RHP of S_plane and since the Nyquist plot Does't encircle the origin there Must #of pole in the RHP that equal to # of zeros In ...
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51 views

Nyquist criterion and the gain/phase margin of transfer function?

Now to determine gain/phase margin I need the bode plot. and to find the value of k such that the system is stable I have to do Nyquist criterion for the closed loop transfer function. (Question: ...
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44 views

Modeling a feedback loop in spice

I'm having some difficulty with an asymmetric half bridge design. I've never been great with control loop theory, and I'm wondering what the best way to figure out the R and C values for the feedback ...
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61 views

Stabilize Vds with a clean voltage reference

I suppose we can simply stabilize V_ds using a voltage reference, like a zener diode (a very clean signal one) to stabilize a MOSFET and keep it from swinging it's Vds and therefore the Id and ...
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46 views

How to choose output network RC and RL values of an audio amplifier?

With "output network" I'm referring to that RC series circuit connected from the amplifier output to the ground, and the following RL parallel circuit connected in series with the output. I know what ...
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78 views

Is it possible to describe an unstable circuit in VHDL?

i was reading this (VHDL: Signal assignment question) post and i got curious about an issue that i wander if it could arise writing VHDL code. Is it possible to write the code for an unstable ...