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DAC5687IPZP 数据表(PDF) 39 Page - Texas Instruments |
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DAC5687IPZP 数据表(HTML) 39 Page - Texas Instruments |
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39 / 72 page  www.ti.com X X ΣΣ X X X X Q(t) I(t) 11 11 10 qmb_gain/210 {0, 1/210 , …, 2 −1/210 } qm_phase/210 {−1/2, −1/2 + 1/210, … , 1/2 −1/210} qma_gain/210 {0, 1/210 , …, 2 −1/210 } L O L O side- band side- band Uncorrected Corrected DAC Offset Control DAC5687 SLWS164B – FEBRUARY 2005 – REVISED JUNE 2005 Figure 40. QMC Block Diagram Figure 41. Example of Sideband Optimization Using QMC Phase and Gain Adjustments Registers qma_offset and qmb_offset control the I and Q path offsets and are 13-bit values with a range of –4096 to 4095. The DAC offset value adds a digital offset to the digital data before digital-to-analog conversion. The qma_gain and qmb_gain registers can be used to backoff the signal before the offset to prevent saturation when the offset value is added to the digital signal. 39 |
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