changing the capacitor value
http://en.wikipedia.org/wiki/Stiffening_capacitor
Aluminum electrolytic: Polarized. Constructionally similar to metal film, but the electrodes are made of etched aluminium to acquire much larger surfaces. The dielectric is soaked with liquid electrolyte. They can achieve high capacities but suffer from poor tolerances, high instability, gradual loss of capacity especially when subjected to heat, and high leakage. Tend to lose capacity in low temperatures. Bad frequency characteristics make them unsuited for high-frequency applications. Special types with low equivalent series resistance are available.
http://en.wikipedia.org/wiki/Stiffening_capacitor
Aluminum electrolytic: Polarized. Constructionally similar to metal film, but the electrodes are made of etched aluminium to acquire much larger surfaces. The dielectric is soaked with liquid electrolyte. They can achieve high capacities but suffer from poor tolerances, high instability, gradual loss of capacity especially when subjected to heat, and high leakage. Tend to lose capacity in low temperatures. Bad frequency characteristics make them unsuited for high-frequency applications. Special types with low equivalent series resistance are available.
Okay.
Quoted from page 3 of that article:
"This is because the equivalent series inductance does not vary significantly with capacitance"
So, how again does a bigger capacitor hurt treble?
Maybe I'm misunderstanding what they're saying, because I had always heard that bigger caps have more inductance.
Perhaps it's just that paralleled caps have less?
-Nick
Quoted from page 3 of that article:
"This is because the equivalent series inductance does not vary significantly with capacitance"
So, how again does a bigger capacitor hurt treble?
Maybe I'm misunderstanding what they're saying, because I had always heard that bigger caps have more inductance.
Perhaps it's just that paralleled caps have less?
-Nick
Bypassing and decoupling refers to energy transference from one circuit to another in addition to enhancing the quality of the power distribution system. Three areas are of concern: power and ground planes, components, and internal power connections.
Decoupling is a means of overcoming physical and time constraints caused by digital circuitry switching logic states. Digital logic involves two possible states, "0" or "1." Decoupling is required to provide sufficient dynamic voltage and current for proper operation of components during clock or data transitions when all component signal pins switch simultaneously under maximum capacitive load. Decoupling is accomplished by ensuring that a low-impedance source is present for the power and ground distribution network. Because capacitors decrease in impedance up to the point of self-resonance, high-frequency noise is effectively diverted from the power distribution system. Low-frequency RF energy transference remains relatively unaffected.
Three common types of capacitor usage exist: bulk, bypass, and decoupling. All capacitor values must be calculated for a specific function. In addition, properly select the dielectric properties of the capacitor, and not leave it to random choice from past usage or experience.
A capacitor may also be used in other applications such as timing, wave shaping, integration, and filtering. When discussing capacitors among associates, proper description and use of the capacitor is required. · Decoupling. Removes RF energy injected into the power distribution network from high-frequency components consuming power at the speed the device is switching at. Decoupling capacitors also provides a localized source of DC power for devices and components, and is particularly useful in reducing peak current surges propagated across the board. · Bypassing. Diverts unwanted common-mode RF energy from components or cables. This is essential in creating an AC shunt to remove undesired RF energy from entering susceptible areas in addition to providing other functions of filtering (bandwidth limiting). · Bulk. Used to maintain constant DC voltage and current to components when all signal pins switch simultaneously under maximum capacitive load. It also prevents power dropout due to dI/dt current surges generated by components.
Decoupling is a means of overcoming physical and time constraints caused by digital circuitry switching logic states. Digital logic involves two possible states, "0" or "1." Decoupling is required to provide sufficient dynamic voltage and current for proper operation of components during clock or data transitions when all component signal pins switch simultaneously under maximum capacitive load. Decoupling is accomplished by ensuring that a low-impedance source is present for the power and ground distribution network. Because capacitors decrease in impedance up to the point of self-resonance, high-frequency noise is effectively diverted from the power distribution system. Low-frequency RF energy transference remains relatively unaffected.
Three common types of capacitor usage exist: bulk, bypass, and decoupling. All capacitor values must be calculated for a specific function. In addition, properly select the dielectric properties of the capacitor, and not leave it to random choice from past usage or experience.
A capacitor may also be used in other applications such as timing, wave shaping, integration, and filtering. When discussing capacitors among associates, proper description and use of the capacitor is required. · Decoupling. Removes RF energy injected into the power distribution network from high-frequency components consuming power at the speed the device is switching at. Decoupling capacitors also provides a localized source of DC power for devices and components, and is particularly useful in reducing peak current surges propagated across the board. · Bypassing. Diverts unwanted common-mode RF energy from components or cables. This is essential in creating an AC shunt to remove undesired RF energy from entering susceptible areas in addition to providing other functions of filtering (bandwidth limiting). · Bulk. Used to maintain constant DC voltage and current to components when all signal pins switch simultaneously under maximum capacitive load. It also prevents power dropout due to dI/dt current surges generated by components.
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