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DAC348x + TRF3705 Filter Design and Gain Flatness

DAC348x + TRF3705 Filter Design and Gain Flatness. Prepared by Kang Hsia 09/23/2013. Gain Flatness Summary. Gain flatness tested on DAC34H84 + TRF3705 with 350MHz LPF in between the DAC and modulator. Gain flatness of less than 1dB gain variation is observed.

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DAC348x + TRF3705 Filter Design and Gain Flatness

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  1. DAC348x + TRF3705 Filter Design and Gain Flatness Prepared by Kang Hsia 09/23/2013

  2. Gain Flatness Summary • Gain flatness tested on DAC34H84 + TRF3705 with 350MHz LPF in between the DAC and modulator. • Gain flatness of less than 1dB gain variation is observed. • Gain flatness of the DAC and modulator is primarily due to the matching of the impedance between the DAC and modulator

  3. TI DAC348x + TRF3705 Interface + BB Filter

  4. Frequency Response

  5. DAC Output / Modulator Input Connection

  6. Gain Flatness Test Setup • TSW3100 + TSW30H84 EVM • 1228.8MSPS, 2x int • Inv sinc enabled • 2.7pF, 33nH, 8.7pF, 33nH, 2.7pF 5th order Butterworth 350MHz filter

  7. TSW3100 GUI Setup

  8. NCO Off (200MHz BW)

  9. NCO at 200MHz (200MHz BW)Filter roll-off = 350MHz (2150MHz RF)

  10. DAC output spectrum (corrected vs. uncorrected sinx/x roll-off)

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