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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.
Another example of frequency dependent capacitance occurs with MOS capacitors, where the slow generation of minority carriers means that at high frequencies the capacitance measures only the majority carrier response, while at low frequencies both types of carrier respond. [61] [69]
An example is the capacitance of a capacitor constructed of two parallel plates both of area ... As a result, device admittance is frequency-dependent, ...
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.
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 frequency dependent AC resistance is called impedance ... This increases the resonance frequency of the capacitor and, for example, can follow the constantly ...
The following formulae use it, assuming a constant voltage applied across the capacitor and resistor in series, to determine the voltage across the capacitor against time: Charging toward applied voltage (initially zero voltage across capacitor, constant V 0 across resistor and capacitor together) V 0 : V ( t ) = V 0 ( 1 − e − t / τ ...
In electronics, a varicap diode, varactor diode, variable capacitance diode, variable reactance diode or tuning diode is a type of diode designed to exploit the voltage-dependent capacitance of a reverse-biased p–n junction.
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