High-speed conversion techniques, particularly while in the telecommunications
area, let the enter to your ADC to get AC-coupled
possibly by a transformer, a capacitor, or even a mixture of
both equally. To the examination and measurement sector nonetheless, the frontend
design isn’t as simple mainly because this software region generally
needs the input signal to generally be DC-coupled in addition as supply the
ability for AC-coupling. The look of an active entrance conclusion
that provides excellent pulse reaction and small distortion from DC
as much as frequencies of 500 MHz (and outside of) is demanding. This
situation of the Analog EdgeSM will supply a couple of style and design strategies and
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ideas for an analog front end for use with high-performance
ADCs ideal for high-speed facts capture.
The preferred approach of interfacing high-frequency analog indicators
on the enter of the ADC is thru using differential
amplifiers. Hence, the very first part to be chosen really should
certainly be a differential output operational amplifier. When choosing
such a gadget, there are 2 key concerns: the obtain bandwidth
item plus the means to set the common-mode output
voltage with the op amp from an exterior voltage. It’s because
it is pretty critical that the signal amplifier driving the ADC?¡¥s
inputs has its prevalent manner output voltage (VCMO) established inside
the ideal range for the ADC. If this situation is not fulfilled,
the ADC?¡¥s effectiveness will quickly degrade as being the disparity
concerning the amplifier?¡¥s VCMO along with the ADC?¡¥s the best possible enter
popular manner voltage boost.
The leading downside of wideband differential op amps is
they normally have limited obtain and should even have their
acquire stage preset internally. Depending on the application, it
may well be required to add a pre-amplifier to your layout to
meet the necessary get need.
For the pre-amplifier, an exceedingly wideband op amp should be
used in buy to meet the specified enter frequency of the
ADC. For devices which sample as many as one GSPS, this equates
to an enter bandwidth necessity of five hundred MHz for more than
sampling techniques.
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