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DC blocks also help suppress signal leakage, such as modulation leakage in signal sources, thereby improving the system’s signal integrity. They can enhance the signal-to-noise ratio (SNR) in sensitive communication systems by preventing the intrusion of unwanted currents.
For any discrete capacitor, there is a frequency above DC at which it ceases to behave as a pure capacitor. This frequency, where is as high as , is called the self-resonant frequency. The self-resonant frequency is the lowest frequency at which the impedance passes through a minimum.
A field-programmable analog array (FPAA) is an integrated circuit device containing computational analog blocks (CABs) [1] [2] and interconnects between these blocks offering field-programmability. Unlike their digital cousin, the FPGA , the devices tend to be more application driven than general purpose as they may be current mode or voltage ...
If, though, the output is taken across the resistor, high frequencies are passed and low frequencies are attenuated (since the capacitor blocks the signal as its frequency approaches 0). In this configuration, the circuit behaves as a high-pass filter. The range of frequencies that the filter passes is called its bandwidth.
Frequency is relative to the natural frequency ω 0. (Its damping ratio ζ and ω 0 would depend on the particular capacitor.) Lower frequencies are more capacitive. Around ω 0, the total impedance and voltage drop is primarily resistive. Higher frequencies are more inductive.
For a power supply line, a bypass capacitor from the supply voltage line to the power supply return (neutral) would be used. High frequencies and transient currents can flow through a capacitor to circuit ground instead of to the harder path of the decoupled circuit, but DC cannot go through the capacitor and continues to the decoupled circuit.
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Each coupling capacitor along with the input electrical impedance of the next stage forms a high-pass filter and the sequence of filters results in a cumulative filter with a cutoff frequency that may be higher than those of each individual filter. Coupling capacitors can also introduce nonlinear distortion at low frequencies. This is not an ...