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Explanation for stability criterium microwave amplifiers

Given a general microwave amplifier circuit For this amplifier (transistor) to be stable the the magnitude of the input and output reflection coefficient must be smaller than 1. But why? What is ...
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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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158 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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Forming Nyquist Plot from magnitude and phase transfer function graphs?

So the solution is present above, but I'm having issues understanding the Nyquist Plot. So here's what I know from the magnitude and phase graphs: At \$\omega = 0\$, \$G = |\infty|\$ At \$\omega ...
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Will this self latching button work without oscillating?

This design is based on EEVblog soft latching button but I am getting inconsistent results from breadboarding. The original EEVblog design oscillates when the button is kept pressed. The original ...
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58 views

What could be the potential reasons for an unstable DAC output like this?

I am simply using a DAC and trying to generate a DC voltage with it. However, the output is unstable from time to time, with very strange diagram on the scope. The diagram is as below. Could I ask ...
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83 views

Ghost charge in op-amp circuit

I have a Trans-impedance amplifier which is made of 2 stages. The first stage converts the current into voltage using 12 Mega-ohm resistance with 47 pf capacitor in parallel. The second stage ...