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2020年5月22日 (金)

High-Performance Analog Entrance Finishes

High-speed conversion programs, especially within the telecommunications

field, enable the enter to your ADC to be AC-coupled

possibly by a transformer, a capacitor, or a blend of

both of those. For your examination and measurement industry on the other hand, the frontend

design and style isn't as uncomplicated due to the fact this software location usually

necessitates the enter signal to generally be DC-coupled too as offer the

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ability for AC-coupling. The look of the lively entrance finish

that delivers very good pulse response and lower distortion from DC

around frequencies of 500 MHz (and further than) is complicated. This

issue with the Analog EdgeSM will give a handful of style suggestions and

suggestions for an analog entrance end for use with high-performance

ADCs ideal for high-speed information capture.

The preferred method of interfacing high-frequency analog indicators

towards the input of an ADC is through using differential

amplifiers. Therefore, the first component being selected really should

certainly be a differential output operational amplifier. When picking

this kind of unit, there are two most important things to consider: the obtain bandwidth

product and the capability to established the common-mode output

voltage of your op amp from an external voltage. This is due to

it is pretty critical the sign amplifier driving the ADC?¡¥s

inputs has its typical manner output voltage (VCMO) set in just

the the best possible selection for your ADC. If this ailment is not met,

the ADC?¡¥s general performance will fast degrade given that the disparity

in between the amplifier?¡¥s VCMO and also the ADC?¡¥s optimum input

widespread mode voltage boost.

The key drawback of wideband differential op amps is

they typically have constrained get and could even have their

gain level preset internally. Based on the application, it

may possibly be needed to include a pre-amplifier into the design and style to

meet the necessary obtain requirement.

For your pre-amplifier, a very wideband op amp should be

used in buy to satisfy the specified input frequency in the

ADC. For systems which sample approximately one GSPS, this equates

to an input bandwidth necessity of five hundred MHz for over

sampling units.

Related links:

The Evolution Of Sensor Analog Front Finishes

Conditioning Sensor Indicators

WHY You require AN ANALOG Front Finish And the way to Set IT UP

Most up-to-date configurable Analog Entrance Conclusion (AFE) simplifies interfacing to many sensors

A fresh Course of Sensor Analog Front Finishes

 

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