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DC blocks are coaxial components that prevent the flow of audio and direct current (DC) frequencies while offering minimum interference to RF signals. There are three basic forms of DC blocks. There are three basic forms of DC blocks.
The "face-down" construction associated with multi-anode technology in tantalum electrolytic capacitors further reduced ESL. Capacitor families such as the so-called MOS capacitor or silicon capacitors offer solutions when capacitors at frequencies up to the GHz range are needed.
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.
This approximation can be extremely inaccurate in some cases where a zero in the numerator is near in frequency. [1] If all the poles are real and there are no zeros, this approximation is always conservative, in the sense that the inverse of the sum of the zero-value time constants is less than the actual corner frequency of the circuit. [2]
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.
Since capacitors differ in their high-frequency characteristics, decoupling ideally involves the use of a combination of capacitors. For example in logic circuits, a common arrangement is ~100 nF ceramic per logic IC (multiple ones for complex ICs), combined with electrolytic or tantalum capacitor (s) up to a few hundred μF per board or board ...
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