CompuScope SDK Manua.. - Egmont Instruments
CompuScope SDK Manua.. - Egmont Instruments
CompuScope SDK Manua.. - Egmont Instruments
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FilteringThe output of an ideal D/A converter is a step function, which contains very high frequency components,usually not desirable for testing analog circuits. The output of an ARB may therefore need to be filtered inorder to smooth the signal. The CompuGen 1100 comes equipped with several software selectable lowpass output filters.Output BandwidthThe output bandwidth of an ARB is related to the D/A conversion rate as well as the analog bandwidth ofthe output amplifier. For example, the bandwidth of the CompuGen 1100 is specified as 20 MHz, eventhough the conversion rate is 80 MS/s. Generally, the bandwidth is four to ten times less than theconversion rate.Glitch EnergyOne of the key characteristics of any ARB is the Glitch Energy of the D/A.Glitch Energy is defined as the area under the curve around zero-crossing, when the signal is changing itspolarity. In simpler terms, Glitch Energy measures the error signal generated by switching the MSB from,say, low to high, while all other bits are switching from high to low (and vice-versa). This error is causedby a small skew in the internal switching of the signals. CompuGen cards are carefully designed to providethe lowest possible glitch energy.<strong>CompuScope</strong> <strong>SDK</strong> <strong>Manua</strong>l Appendix D Page 77