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Comments on What we call this opamp configuration? [SOLVED]

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What we call this opamp configuration? [SOLVED]

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1- What we call this opamp configuration?
2- What's the advantage and the disadvantage of this circuit?
3- And what's the purpose of the L2 in the feedback?

I have changed gradually the value of L2 from 1 pH to hundreds of H but nothing noticeable, then I replaced it with a resistor and did the same process the result was the same, in the end I replaced them with a wire the result was also the same.

Edit: this circuit was designed in National Aviation University of Kyiv, Ukraine.

The circuit is suposed to exhibits a maximum in-band total harmonic distortion (THD) of 1.7%. And a maximum in-band phase noise of −139.3 dBc/Hz at 100 kHz offset frequency and has an outstanding value of a standard figure of merit (FoM) of −198.6 dBc/Hz.

The mess

Edit2:
For question 3 the inductor L1 provides positive shunt–shunt feedback.

Edit3:

For question 1 the opamp configuration is a Negative inductance circuit, a type of negative impedance converter.

Negative impedance converter

This circuit can be configurated in different ways the negative of any impedance can be produced, including negative capacitance and negative inductance.

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3 comment threads

Edit: this circuit was designed in National Aviation University of Kyiv, Ukraine. (1 comment)
Not really solved (2 comments)
No input signal? Therefore, does the circuit produce this output? Oscillation? (2 comments)
No input signal? Therefore, does the circuit produce this output? Oscillation?
LvW‭ wrote about 1 year ago

No input signal? Therefore, does the circuit produce this output? Oscillation?

deleted user wrote about 1 year ago

@LvW‭ yes in mV.