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

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Presentation transcript:

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

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 2

TI DAC348x + TRF3705 Interface + BB Filter 3

Frequency Response 4

DAC Output / Modulator Input Connection 5

12/24/2015 Gain Flatness Test Setup TSW TSW30H84 EVM MSPS, 2x int Inv sinc enabled 2.7pF, 33nH, 8.7pF, 33nH, 2.7pF 5 th order Butterworth 350MHz filter

12/24/2015 TSW3100 GUI Setup

12/24/2015 NCO Off (200MHz BW)

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

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