New KCC Quiz AQQ299 about Opamp Open Loop Gain and LTspice

A kind proposal from Al Butvidas

1. Quote of the month: "A good friend calls you in jail. A great friend bails you out of jail. Your best friend sits next to you and says 'wasn't that fun?'" - unknown

2. New quiz AQQ299 about an amazing observation on LTspice and an opamp loop gain. This quiz is a kind proposal from Al Butvas at retiredEE 

As most engineers know, the loop gain {T(s)} of a feedback configuration is a complex function of frequency and

is typically expressed on a Bode plot showing |T(s)| (in dB units) and ∠T(s) (in degrees) over the frequency (s = j2πf) range of interest.

It has been observed when doing some measurements of loop gain {T(s)} on an op amp configuration using LTspice,

one can notice there are points where the absolute value of:

                                  20 Log₁₀|T(s)| equals |T(s)|

Question: on the magnitude plot, find the point(s) such that:

We count on retiredEE advises if additional details are asked!

Good luck and try to be among the first ones!

Kuo-Chang