Time Interleaved Offset Calibration Block (OCB) - 2.6 English

Zynq UltraScale+ RFSoC RF Data Converter Gen 1/2/3/DFE LogiCORE IP Product Guide (PG269)

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2.6 English

This block corrects for the DC offset of each of the sub-RF-ADCs. Any residual DC offset not corrected appears as a spur at k*Fs/N, where Fs is the composite sampling rate of the RF-ADC, N is the number of sub-RF-ADCs interleaved together, and k = 0, 1, 2, … N. N is 8 for the Dual RF-ADC tile variant and N is 4 for the Quad RF-ADC tile variant. This block is further divided down to two sub-blocks called OCB1 and OCB2. OCB2 only runs during FG CAL while OCB1 runs during both FG and BG CAL. The OCB2 block cancels offsets of the sub RF-ADCs at start-up. The OCB1 block cancels sub-RF-ADC offsets continuously in the BG calibration process without affecting the input signal content at the offset locations.