Charge Converter

Charge Converter

Charge converters convert high-impedance charge output signals to low-impedance voltage or current. Piezoelectric, capacitive, and other charge-producing sensors are connected by transducers to an amplifier, which processes the signal and sends the voltage or current to a display such a front panel, touch screen, or computer monitor. Charge converters and charge amplifiers are inexpensive tools used for measuring things like:

  • dynamic pressure,
  • temperature
  • acceleration
    A voltage excitation supply or a current excitation supply may be used in some charge converters to power the sensor. Others include sensors that are integrated or pre-packaged.


  • The maximum output voltage precision,
  • adjustable gain,
  • signal isolation of charge converters are different.
    Additionally, they offer various outputs for voltage, current, and relays. Temperature, hysteresis, and signal conditioning linearity all affect accuracy. Programmable gain tracks amplification changes made by a front panel or other local interface or via a computer interface. Signal isolation, which separates the signal's direct electrical contact, can be accomplished using magnetic induction, optical isolation, and capacitors. Multiplexers, which combine many inputs into one output for transmission, can also be included in charge converters and charge amplifiers. Differential channels employ the difference between two signals as an input for analogue input channels.


Charge converters and charge amplifiers can use a variety of filter topologies. Applications requiring low noise levels use analogue filters, which are built with resistors and capacitors. Both finite impulse response (FIR) and infinite impulse response (IIR) filters are included in the design of digital filters, which use solid-state components. Anti-alias characteristics in filter functions, which rectify signal misinterpretation due to sluggish sampling, are frequently programmable. Filters with low pass and high pass ranges block or weaken signals that are above or below a predetermined cutoff frequency. Signals outside of the low pass and high pass cutoff frequencies are suppressed or blocked by band pass filters. While all-pass filters permit all frequencies to pass, band stop frequencies only block a subset of the frequency range.


Numerous aerospace, medical, and industrial applications use charge converters and charge amplifiers. These tools, for instance, are utilised in vehicle dynamics investigations along with pressure transducers and high intensity microphones. Additionally, they are employed in pacemakers equipped with accelerometers, which use motion to determine the proper pacing rate.


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