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Another example of frequency dependent capacitance occurs with ... In schematic diagrams, a capacitor used primarily for DC charge storage is often drawn vertically ...
The linear term in jω in this transfer function can be derived by the following method, which is an application of the open-circuit time constant method to this example. Set the signal source to zero. Select capacitor C 2, replace it by a test voltage V X, and replace C 1 by an open circuit.
A resistor–capacitor circuit (RC circuit), or RC filter or RC network, is an electric circuit composed of resistors and capacitors. It may be driven by a voltage or current source and these will produce different responses.
The electronic symbol for a frequency-dependent negative resistor. The symbol is intended to evoke a double capacitor. 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.
Wien's bridge is used for precision measurement of capacitance in terms of resistance and frequency. [3] It was also used to measure audio frequencies. The Wien bridge does not require equal values of R or C. At some frequency, the reactance of the series R 2 –C 2 arm will be an exact multiple of the shunt R x –C x arm.
This example also assumes A v is frequency independent, but more generally there is frequency dependence of the amplifier contained implicitly in A v. Such frequency dependence of A v also makes the Miller capacitance frequency dependent, so interpretation of C M as a capacitance becomes more difficult.
The resonant frequency for a driven RLC circuit is the same as a circuit in which there is no damping, hence undamped resonant frequency. The resonant frequency peak amplitude, on the other hand, does depend on the value of the resistor and is described as the damped resonant frequency.
A voltage-controlled capacitor is one method of making an LC oscillator vary its frequency in response to a control voltage. Any reverse-biased semiconductor diode displays a measure of voltage-dependent capacitance and can be used to change the frequency of an oscillator by varying a control voltage applied to the diode.