A Wideband 2 × 13-bit All-Digital I/Q RF-DAC

This paper presents a wideband 2[Formula Omitted]13-bit in-phase/quadrature-phase (I/Q) RF digital-to-analog converter-based all-digital modulator realized in 65-nm CMOS. The isolation between I and Q paths is guaranteed employing 25% duty-cycle differential quadrature clocks. With a 1.3-V supply an...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2014-04, Vol.62 (4), p.732-752
Main Authors: ALAVI, Morteza S, STASZEWSKI, Robert Bogdan, DE VREEDE, Leo C. N, LONG, John R
Format: Article
Language:English
Subjects:
Algorithms
Applied sciences
Circuit properties
Design. Technologies. Operation analysis. Testing
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Integrated circuits
Oscillators, resonators, synthetizers
Radiocommunications
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Signal convertors
Telecommunications
Telecommunications and information theory
Transmitters. Receivers
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Summary:This paper presents a wideband 2[Formula Omitted]13-bit in-phase/quadrature-phase (I/Q) RF digital-to-analog converter-based all-digital modulator realized in 65-nm CMOS. The isolation between I and Q paths is guaranteed employing 25% duty-cycle differential quadrature clocks. With a 1.3-V supply and an on-chip power combiner, the digital I/Q transmitter provides more than 21-dBm RF output power within a frequency range of 1.36-2.51 GHz. The peak RF output power, overall system, and drain efficiencies of the modulator are 22.8 dBm, 34%, and 42%, respectively. The measured static noise floor is below [Formula Omitted]160 dBc/Hz. The digital I/Q RF modulator demonstrates an IQ image rejection and local oscillator leakage of [Formula Omitted]65 and [Formula Omitted]68 dBc, respectively. It could be linearized using either of the two digital predistortion (DPD) approaches: a memoryless polynomial or a lookup table. Its linearity is examined using single-carrier 4/16/64/256/1024 quadrature amplitude modulation (QAM), as well as multi-carrier 256-QAM orthogonal frequency-division multiplexing baseband signals while their related modulation bandwidth can be as high as 154 MHz. Employing DPD improves the third-order intermodulation product [Formula Omitted] by more than 25 dB, while the measured error vector magnitude for a "single-carrier 22-MHz 64-QAM" signal is better than [Formula Omitted]28 dB.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2014.2307876