Communities

Writing
Writing
Codidact Meta
Codidact Meta
The Great Outdoors
The Great Outdoors
Photography & Video
Photography & Video
Scientific Speculation
Scientific Speculation
Cooking
Cooking
Electrical Engineering
Electrical Engineering
Judaism
Judaism
Languages & Linguistics
Languages & Linguistics
Software Development
Software Development
Mathematics
Mathematics
Christianity
Christianity
Code Golf
Code Golf
Music
Music
Physics
Physics
Linux Systems
Linux Systems
Power Users
Power Users
Tabletop RPGs
Tabletop RPGs
Community Proposals
Community Proposals
tag:snake search within a tag
answers:0 unanswered questions
user:xxxx search by author id
score:0.5 posts with 0.5+ score
"snake oil" exact phrase
votes:4 posts with 4+ votes
created:<1w created < 1 week ago
post_type:xxxx type of post
Search help
Notifications
Mark all as read See all your notifications »
Q&A

Post History

33%
+0 −2
Q&A What we call this opamp configuration? [SOLVED]

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...

1 answer  ·  posted 1y ago by deleted user  ·  edited 1y ago by deleted user

Question opamp
#8: Post edited by (deleted user) · 2023-01-17T19:58:06Z (about 1 year ago)
  • 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.
  • ![](https://electrical.codidact.com/uploads/2kvi2n4lcpmlmops2uf22gj6w3ei)
  • **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](https://electrical.codidact.com/uploads/2euaqcuwec9f2k9g4hfyprvy7f1e)
  • **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](https://en.m.wikipedia.org/wiki/Negative_impedance_converter)
  • ![](https://electrical.codidact.com/uploads/hct1n4bka2sa8j59cypmhzi0728q)
  • 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.
  • ![](https://electrical.codidact.com/uploads/2kvi2n4lcpmlmops2uf22gj6w3ei)
  • **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](https://electrical.codidact.com/uploads/2euaqcuwec9f2k9g4hfyprvy7f1e)
  • **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](https://en.m.wikipedia.org/wiki/Negative_impedance_converter)
  • ![ ](https://electrical.codidact.com/uploads/hct1n4bka2sa8j59cypmhzi0728q)
  • This circuit can be configurated in different ways the negative of any impedance can be produced, including negative capacitance and negative inductance.
#7: Post edited by (deleted user) · 2023-01-17T12:10:27Z (about 1 year ago)
  • 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.
  • ![ ](https://electrical.codidact.com/uploads/2kvi2n4lcpmlmops2uf22gj6w3ei)
  • **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 has 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](https://electrical.codidact.com/uploads/2euaqcuwec9f2k9g4hfyprvy7f1e)
  • **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](https://en.m.wikipedia.org/wiki/Negative_impedance_converter)
  • ![](https://electrical.codidact.com/uploads/hct1n4bka2sa8j59cypmhzi0728q)
  • 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.
  • ![](https://electrical.codidact.com/uploads/2kvi2n4lcpmlmops2uf22gj6w3ei)
  • **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](https://electrical.codidact.com/uploads/2euaqcuwec9f2k9g4hfyprvy7f1e)
  • **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](https://en.m.wikipedia.org/wiki/Negative_impedance_converter)
  • ![](https://electrical.codidact.com/uploads/hct1n4bka2sa8j59cypmhzi0728q)
#6: Post edited by (deleted user) · 2023-01-17T12:07:20Z (about 1 year ago)
  • What we call this opamp configuration?
  • What we call this opamp configuration? [SOLVED]
  • 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.
  • ![ ](https://electrical.codidact.com/uploads/2kvi2n4lcpmlmops2uf22gj6w3ei)
  • **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 has 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](https://electrical.codidact.com/uploads/2euaqcuwec9f2k9g4hfyprvy7f1e)
  • **Edit2:**
  • For question 3 the inductor L1 provides positive shunt–shunt feedback.
  • 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.
  • ![ ](https://electrical.codidact.com/uploads/2kvi2n4lcpmlmops2uf22gj6w3ei)
  • **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 has 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](https://electrical.codidact.com/uploads/2euaqcuwec9f2k9g4hfyprvy7f1e)
  • **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](https://en.m.wikipedia.org/wiki/Negative_impedance_converter)
  • ![](https://electrical.codidact.com/uploads/hct1n4bka2sa8j59cypmhzi0728q)
#5: Post edited by (deleted user) · 2023-01-16T14:14:18Z (about 1 year ago)
  • What we call this opamp configuration?
  • What's the advantage and the disadvantage of this circuit?
  • 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.
  • ![ ](https://electrical.codidact.com/uploads/2kvi2n4lcpmlmops2uf22gj6w3ei)
  • **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 has 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](https://electrical.codidact.com/uploads/2euaqcuwec9f2k9g4hfyprvy7f1e)
  • 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.
  • ![ ](https://electrical.codidact.com/uploads/2kvi2n4lcpmlmops2uf22gj6w3ei)
  • **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 has 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](https://electrical.codidact.com/uploads/2euaqcuwec9f2k9g4hfyprvy7f1e)
  • **Edit2:**
  • For question 3 the inductor L1 provides positive shunt–shunt feedback.
#4: Post edited by (deleted user) · 2023-01-16T12:16:07Z (about 1 year ago)
  • What we call this opamp configuration?
  • What's the advantage and the disadvantage of this circuit?
  • 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.
  • ![ ](https://electrical.codidact.com/uploads/2kvi2n4lcpmlmops2uf22gj6w3ei)
  • **Edit:** this circuit was designed in National Aviation University of Kyiv, Ukraine.
  • This circuit is suposed to exhibits a maximum in-band total harmonic distortion (THD) of 1.7%. And has 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](https://electrical.codidact.com/uploads/2euaqcuwec9f2k9g4hfyprvy7f1e)
  • What we call this opamp configuration?
  • What's the advantage and the disadvantage of this circuit?
  • 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.
  • ![ ](https://electrical.codidact.com/uploads/2kvi2n4lcpmlmops2uf22gj6w3ei)
  • **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 has 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](https://electrical.codidact.com/uploads/2euaqcuwec9f2k9g4hfyprvy7f1e)
#3: Post edited by (deleted user) · 2023-01-16T12:13:55Z (about 1 year ago)
  • What we call this opamp configuration?
  • What's the advantage and the disadvantage of this circuit?
  • 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.
  • ![ ](https://electrical.codidact.com/uploads/2kvi2n4lcpmlmops2uf22gj6w3ei)
  • **Edit:**
  • ![](https://electrical.codidact.com/uploads/2euaqcuwec9f2k9g4hfyprvy7f1e)
  • What we call this opamp configuration?
  • What's the advantage and the disadvantage of this circuit?
  • 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.
  • ![ ](https://electrical.codidact.com/uploads/2kvi2n4lcpmlmops2uf22gj6w3ei)
  • **Edit:** this circuit was designed in National Aviation University of Kyiv, Ukraine.
  • This circuit is suposed to exhibits a maximum in-band total harmonic distortion (THD) of 1.7%. And has 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](https://electrical.codidact.com/uploads/2euaqcuwec9f2k9g4hfyprvy7f1e)
#2: Post edited by (deleted user) · 2023-01-16T11:26:17Z (about 1 year ago)
New circuit
  • What we call this opamp configuration?
  • What's the advantage and the disadvantage of this circuit?
  • 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.
  • ![ ](https://electrical.codidact.com/uploads/2kvi2n4lcpmlmops2uf22gj6w3ei)
  • What we call this opamp configuration?
  • What's the advantage and the disadvantage of this circuit?
  • 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.
  • ![ ](https://electrical.codidact.com/uploads/2kvi2n4lcpmlmops2uf22gj6w3ei)
  • **Edit:**
  • ![](https://electrical.codidact.com/uploads/2euaqcuwec9f2k9g4hfyprvy7f1e)
#1: Initial revision by (deleted user) · 2023-01-15T21:43:17Z (about 1 year ago)
What we call this opamp configuration?
What we call this opamp configuration?  
What's the advantage and the disadvantage of this circuit?    
 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.

![ ](https://electrical.codidact.com/uploads/2kvi2n4lcpmlmops2uf22gj6w3ei)