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A 2-GS/s 3-bit ΔΣ-modulated DAC with tunable bandpass mismatch shaping

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4 Author(s)
Kaplan, T.S. ; Univ. of California, Los Angeles, CA, USA ; Jensen, J.F. ; Fields, C.H. ; Chang, M.-C.F.

Direct digital synthesis of signals in the hundreds of megahertz can lead to simpler, smaller transceivers, free of images and LO feedthrough that plague systems requiring analog upconversion. We present a 3-bit, 2 GS/s, ΔΣ-modulated DAC in InP HBT technology. The DAC is linearized using bandpass mismatch shaping. The mismatch shaper uses seven tunable 1.5-bit discrete-time bandpass ΔΣ modulators to dynamically route the digital signals to the DACs. These ΔΣ modulators operate in the analog domain to decrease system complexity and power consumption. The mismatch-shaped DAC can generate narrowband signals between 250-750 MHz with >68 dB SNR in a 1-MHz bw, >74-dB SFDR, and <-80-dBc intermodulation distortion with an 8.1-W power consumption.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:40 ,  Issue: 3 )

Date of Publication:

March 2005

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