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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