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Table 1 Specifications of OCTAD-S

From: OCTAD-S: digital fast Fourier transform spectrometers by FPGA

Spectrometer 4G4K 2G64K
RF input 4 2
ADC sample speed 4.096 GHz 2.048 GHz
Observation bandwidth 2.048 GHz 1.024 GHz
ADC resolution 10 bit
ENOB 8 bit
GFDR ~38 dB ~37 dB
Max. input power 0 dBm
Max. input frequency ~8 GHz
FPGA Xilinx Virtex-7 (XC7VX485T)
No. of FPGA per RF input 1 2
Frequency channel 2048 32,768
Channel separation 1 MHz 31.25 kHz
Spectral resolution (−3 dB) 2.0 MHz 64 kHz
Spectral resolution (−10 dB) 2.9 MHz 90 kHz
Acquisition time per spectrum 1 µs 32 µs
Spectral dump time 8 ms
Number of accumulation 8000 250
FFT resolution 32 bit
Accumulator resolution 45 bit 40 bit
Output resolution 16 bit
Temperature range 0–90 °C
Allan variance >1500 s