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- Charge_amplifier abstract "A charge amplifier is a current integrator driven by an electrical source with capacitive nature such as a piezoelectric sensor. Contrary to what its name may suggest, a charge amplifier does not amplify the electric charge present at its input (it can amplify only the exciting input voltage). The charge amplifier just transfers the input charge to another reference capacitor and produces an output voltage equal to the voltage across the reference capacitor. Thus the output voltage is proportional to the charge of the reference capacitor and, respectively, to the input charge; hence the circuit acts as a charge-to-voltage converter. The input impedance of the circuit is almost zero because of the Miller effect. Hence all the stray capacitances (the cable capacitance, the amplifier input capacitance, etc.) are virtually grounded and they have no influence on the output signal.Common applications include piezoelectric sensors and photodiodes, in which the charge output from the transducer is converted into a voltage. Charge amplifiers are often found in instrumentation, and in the readout circuitry of CCD imagers and flat-panel X-ray detector arrays. In read-out circuits the objective is usually to measure the very small charge stored within an in-pixel capacitor, despite the capacitance of the circuit-track to the readout circuit being a couple of orders of magnitude greater than the in-pixel capacitor.Advantages include: Enables quasi-static measurements in certain situations, such as constant pressures on a piezo lasting several minutes Piezo element transducer can be used in much hotter environments than those with internal electronics Gain is dependent only on the feedback capacitor, unlike voltage amplifiers, which are affected greatly by the input capacitance of the amplifier and the parallel capacitance of the cable↑ ↑ 2.0 2.1 2.2 ↑".
- Charge_amplifier wikiPageExternalLink interface.
- Charge_amplifier wikiPageExternalLink chargeamp.gif.
- Charge_amplifier wikiPageID "3544941".
- Charge_amplifier wikiPageRevisionID "544245616".
- Charge_amplifier hasPhotoCollection Charge_amplifier.
- Charge_amplifier subject Category:Electronic_amplifiers.
- Charge_amplifier type Amplifier102705944.
- Charge_amplifier type Artifact100021939.
- Charge_amplifier type ElectronicAmplifiers.
- Charge_amplifier type ElectronicEquipment103278248.
- Charge_amplifier type Equipment103294048.
- Charge_amplifier type Instrumentality103575240.
- Charge_amplifier type Object100002684.
- Charge_amplifier type PhysicalEntity100001930.
- Charge_amplifier type Whole100003553.
- Charge_amplifier comment "A charge amplifier is a current integrator driven by an electrical source with capacitive nature such as a piezoelectric sensor. Contrary to what its name may suggest, a charge amplifier does not amplify the electric charge present at its input (it can amplify only the exciting input voltage). The charge amplifier just transfers the input charge to another reference capacitor and produces an output voltage equal to the voltage across the reference capacitor.".
- Charge_amplifier label "Charge amplifier".
- Charge_amplifier label "Ladungsverstärker".
- Charge_amplifier sameAs Ladungsverstärker.
- Charge_amplifier sameAs m.09kn0l.
- Charge_amplifier sameAs Q1800062.
- Charge_amplifier sameAs Q1800062.
- Charge_amplifier sameAs Charge_amplifier.
- Charge_amplifier wasDerivedFrom Charge_amplifier?oldid=544245616.
- Charge_amplifier isPrimaryTopicOf Charge_amplifier.
