Contents
Which converts negative current can be seen?
The negative impedance converter (NIC) is a one-port op-amp circuit acting as a negative load which injects energy into circuits in contrast to an ordinary load that consumes energy from them.
Why is the impedance of a capacitor negative?
The resistance of an ideal capacitor is zero. The reactance of an ideal capacitor, and therefore its impedance, is negative for all frequency and capacitance values. The effective impedance (absolute value) of a capacitor is dependent on the frequency, and for ideal capacitors always decreases with frequency.
How does a negative impedance converter ( NIC ) work?
The negative impedance converter (NIC) is a one-port op-amp circuit acting as a negative load which injects energy into circuits in contrast to an ordinary load that consumes energy from them. This is achieved by adding or subtracting excessive varying voltage in series to the voltage drop across an equivalent positive impedance.
Can a NIC be used as a negative resistor?
By using an NIC as a negative resistor, it is possible to let a real generator behave (almost) like an ideal generator, (i.e., the magnitude of the current or of the voltage generated does not depend on the load). An example for a current source is shown in the figure on the right.
Which is the input impedance of a GIC?
Figure 2 shows a GIC which is built using two op-amps and five impedances. The input impedance of a GIC is given by Z 1 Z 3 Z 5 / (Z 2 Z 4 ). Build a GIC to simulate (act as) a 10kΩ resistor using two op-amps and five resistors. Use this simulated resistor in series with a real 10kΩ resistor to build a voltage divider as shown in Figure 3.
What happens when the impedance of a generator is reduced?
In particular, the surplus current from the INIC generates positive feedback that causes the voltage driving the load to reach its power supply limits. By reducing the impedance of the load (i.e., by causing the load to draw more current), the generator–NIC system can be rendered stable again.