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- Hardware Features
- Special Features
49xx High Bandwidth Option (hbw)
All Spectrum digitizers have a bandwidth that is limited to around half of the maximum sampling rate which is a good restriction when looking at the Nyquist-Shanning sampling theorem. Sometimes applications require a higher bandwidth than that especially for undersampling applications. In undersampling (or bandpass sampling) applications a bandpass filtered signal is sampled at a sampling frequency below its Nyquist rate. The fast cards of 49xx series for all platforms allow a special option to increase the bandwidth in exchange for worse SNR and RMS noise.
Below you find a comparison of a standard M2i.4963 and M2i.4931 card with the high bandwidth option. The high bandwidth option figures are taken from a prototype card:
| Figure | M2.4931 | M2i.4963 | M2i.4963 with hbw option |
|---|---|---|---|
| Sampling rate | 30 MS/s | 60 MS/s | 60 MS/s |
| -3 dB Bandwidth | 15 MHz | 30 MHz | 65 MHz |
| RMS noise 200 mV | 5.5 LSB | 7.0 LSB | 12.0 LSB |
| RMS noise 1 V | 4.5 LSB | 5.0 LSB | 7.0 LSB |
| SNR 1 MHz signal 1 V | 76.4 dB | 74.5 dB | 73.4 dB |
| THD 1 MHz signal 1 V | -80.5 dB | -80.0 dB | -80.0 dB |
| ENOB (based on SNR) | 12.3 bit | 12.1 bit | 11.9 dB |
The high bandwidth option is available for the following product families:
- M2i.496x-exp PCI Express digitizer
- M2i.496x PCI/PCI-X digitizer
- DN2.496-xx digitizerNETBOX
- MX.496x PXI 3U digitizer
- MC.496x cPCI 6U digitizer