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Frequency-dependent Negative Resistor
A frequency-dependent negative resistor (FDNR) is a circuit element that exhibits a purely real negative resistance −1/(''ω''2''kC'') that decreases in magnitude at a rate of −40 dB per decade. The element is used in implementation of low-pass active filters modeled from Electronic filter topology, ladder filters. The element is usually implemented from a generalized impedance converter (GIC) or gyrator. The impedance of a FDNR is : Z = \frac or : Z = \frac, when ''s'' = j''ω''. The concept of frequency-dependent negative resistors was introduced by L. T. Bruton and is expounded upon within several chapters of his book. They are also discussed in Temes & LaPatra, Chen and Wait, Huelsman & Korn. Application If all the Electrical impedance, impedances (including the source and load impedances) of a passive ladder filter are divided by ''s''k, the transfer function is not changed. The effect of this division is to transform resistors into capacitors, in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frequency Dependent Negative Resistance Electronic Symbol
Frequency is the number of occurrences of a repeating event per unit of time. Frequency is an important parameter used in science and engineering to specify the rate of oscillation, oscillatory and vibration, vibratory phenomena, such as mechanical vibrations, audio signals (sound), radio waves, and light. The interval of time between events is called the period. It is the Multiplicative inverse, reciprocal of the frequency. For example, if a heart beats at a frequency of 120 times per minute (2 hertz), its period is one half of a second. Special definitions of frequency are used in certain contexts, such as the angular frequency in rotational or cyclical properties, when the rate of angular progress is measured. Spatial frequency is defined for properties that vary or cccur repeatedly in geometry or space. The unit of measurement of frequency in the International System of Units (SI) is the hertz, having the symbol Hz. Definitions and units For cyclical phenomena ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
