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

Todd S. Kaplan; Joseph F. Jensen; Charles H. Fields; Mau-Chung Chang

doi:10.1109/JSSC.2005.843708

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

Todd S. Kaplan^*, Joseph F. Jensen, Charles H. Fields, Mau-Chung Chang

^*Corresponding author for this work

Department of Electronics Engineering

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	603-609
Number of pages	7
Journal	IEEE Journal of Solid-State Circuits
Volume	40
Issue number	3
DOIs	https://doi.org/10.1109/JSSC.2005.843708
State	Published - 1 Mar 2005

Keywords

Digital-analog conversion
Dynamic element matching
Mismatch shaping
Sigma-delta modulation

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

abstract = "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.",

keywords = "Digital-analog conversion, Dynamic element matching, Mismatch shaping, Sigma-delta modulation",

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