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Circuit Idea/Bistable Mode of Current Inversion NIC
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Investigating the Bistable Mode of Negative Impedance Converters with Current Inversion
Circuit idea: Making the positive feedback dominate over the negative one.
right|thumb|300px|INIC operating in bistable mode is a current-driven N-shaped true negative resistor.__TOC__
Introduction
What a current inversion NIC to operate in bistable mode means
How to investigate the bistable mode of current inversion NIC
left|thumb|375px|Fig. 1a: A hysteresis IV curve of current-driven INIC.
right|thumb|375px|Fig. 1b: An N-shaped IV curve of voltage-driven INIC.
Investigating the circuit at ideal driving conditions
Increasing the input current
Negative input current, negative output voltage
left|thumb|380px|Fig. 2a: Scanning the left bottom part (0 - 1) of the curve.
right|thumb|375px|Fig. 2b: Sinking a current from INIC.
Zero input current, negative output voltage
left|thumb|380px|Fig. 3a: Investigating the point 1 of the curve.
right|thumb|375px|Fig. 3b: Sinking no current from INIC.
Positive input current, negative output voltage
left|thumb|380px|Fig. 4a: Scanning the left top part (1 - 2) of the curve.
right|thumb|375px|Fig. 4b: Injecting a current to INIC.
Voltage jump upward
...start...
left|thumb|380px|Fig. 5-1a: Investigating the starting point of the voltage jump.
right|thumb|375px|Fig. 5-1b: Making the op-amp "jump" to the positive rail.
...middle...
left|thumb|380px|Fig. 5-2a: Scanning the top jumping path (2 - 3).
right|thumb|375px|Fig. 5-2b: The op-amp "jumps" to the positive rail.
...final
left|thumb|380px|Fig. 5-3a: Investigating the final point of the voltage jump upward.
right|thumb|375px|Fig. 5-3b: The op-amp "calms down" at the positive rail.
Positive input current, positive output voltage
left|thumb|380px|Fig. 6a: Scanning the right top part (3 - 4) of the curve.
right|thumb|375px|Fig. 6b: Injecting a big current to INIC.
Decreasing the input current
Positive input current, positive output voltage
left|thumb|380px|Fig. 7a: Scanning the right top part (4 - 5) of the curve.
right|thumb|375px|Fig. 7b: Injecting a current to INIC.
Zero input current, positive output voltage
left|thumb|380px|Fig. 8a: Investigating the point 5 of the curve.
right|thumb|375px|Fig. 8b: Injecting no current to VNIC.
Negative input current, positive output voltage
left|thumb|380px|Fig. 9a: Scanning the right bottom part (5 - 6) of the curve.
right|thumb|375px|Fig. 9b: Sinking a current from INIC.
Voltage jump downward
...start...
left|thumb|380px|Fig. 10-1a: Investigating the starting point of the voltage jump.
right|thumb|375px|Fig. 10-1b: Making the op-amp "jump" to the negative rail.
...middle...
left|thumb|380px|Fig. 10-2a: Scanning the bottom jumping path (6 - 7).
right|thumb|375px|Fig. 10-2b: The op-amp "jumps" to the negative rail.
...final
left|thumb|380px|Fig. 10-3a: Investigating the final point of the voltage jump downward.
right|thumb|375px|Fig. 10-3b: The op-amp "calms down" at the negative rail.
Negative input current, negative output voltage
left|thumb|380px|Fig. 11a: Scanning the left bottom part (7 - 0) of the curve.
right|thumb|375px|Fig. 11b: Siniking a big current from INIC.
Investigating the circuit at real driving conditions
How to make INIC operate in bistable mode
What is the relation with the non-inverting comparator with hysteresis?
See also
Revealing the mystery of negative impedance
Investigating the linear mode of negative impedance converters with current inversion
Negative impedance converter from Wikipedia considers NIC with current inversion (INIC).
References
External links
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