Gage CompuScope 14100C, Руководство по аппаратному обеспечению и инструкция по установке драйверов

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104 CompuScope 82GC
CompuScope 82GC - 1 GHz Bandwidth version
The CompuScope 82GC – 1 GHz is a special member of Gage’s high-performance CS82GC product family.
This section explains the key differences between the standard CS82GC and the special 1 GHz bandwidth
version.
1. Why is 1 GHz of bandwidth important?
A higher bandwidth increases the precision and widens the range of applications of fast digitizers. By
‘precision’ we mean “less distortion” of the high frequency components that can be found in the spectrum of
very fast transients.
While operating at 2 GS/s, the CompuScope 82GC – 1 GHz provides a bandwidth limit that is equal to the
Nyquist frequency of 1 GHz.
2. Specifications of the CS82GC – 1GHz Bandwidth version
The 1GHz bandwidth version of the CS82GC shares most of the specifications of the standard product.
However, a few key differences exist. This section will highlight these differences and describe how to best
operate the product so as to perform accurate measurements and prevent damage to the card.
Note that the CS82GC – 1 GHz can be ordered with or without Internal Triggering. Only the dynamic
performance of the product is affected by this choice.
2.1 – Input Characteristics and Protection
The modification made to the CS82GC to give it a 1GHz bandwidth requires the bypassing of most of
the protection from high voltages as well as of all but 1 input range in each of the operating modes.
The input must be single-ended with an impedance of 50 Ohms, which is protected by diode clamping.
Therefore, when operating a CS82GC – 1 GHz, users must be cautious to not exceed the absolute
maximum input voltage of ± 1V.
Furthermore, the only input ranges available for this product are ± 250mV in Dual Channel Mode, and
± 500mV in Single Channel Mode.
The following table provides the typical bandwidth of the CompuScope 82GC – 1 GHz with, and
without, Internal Trigger.
Single
Channel
Dual
Channel
Bandwidth with
Internal Trigger 1 GHz 380 MHz
Bandwidth without
Internal Trigger 1.3 GHz 1 GHz
2.2 – Dynamic Performance
The following tables provide the typical dynamic performance of the CompuScope 82GC – 1 GHz
with (and without) Internal Trigger.
Single Channel Mode – sampling at 2 GS/s
Signal Input:
15 MHz 100 MHz 200 MHz
SNR (dB) 43 (43) 42 (42) 41 (42)
SFDR (dB) 52 (55) 50 (55) 49 (54)
SINAD (dB)
43 (43) 41 (43) 40 (42)
THD (dB)
-56 (-56) -52 (-55) -47 (-54)
ENOB (bits) 6.8 (6.8) 6.7 (6.7) 6.5 (6.7)