A Low Power and Low Quantization Noise Digital Sigma-Delta Modulator for Wireless Transmitters

Parikh, V.K.; Balsara, Poras T.; Eliezer, Oren; Mehta, Jaimin

doi:10.1109/iscas.2007.378210

Cited by 5 publications

(1 citation statement)

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“…For example, a pipelined ΔΣ modulator operating at 5.4 GHz was validated in [6]. Furthermore, a digital ΔΣ modulator with a multibit quantizer in a 90-nm CMOS for a wireless transmitter presented in [9] shows a submilliwatt power consumption running at 468 MHz for 7-bit signed data. For the DACs, a 6-bit full-Nyquist 3-GS/s DAC has been presented that only consumes 29 mW [10].…”

Section: A Nonlinear Inversion Using a δς Modulatormentioning

confidence: 99%

Adaptive Predistortion Using a $\Delta\Sigma$ Modulator for Automatic Inversion of Power Amplifier Nonlinearity

Boo

Chung

Dawson

2009

IEEE Trans. Circuits Syst. II

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This brief demonstrates a new adaptive digital predistortion architecture particularly suited to mobile handset applications. The central idea is to build a lookup table (LUT) that directly captures the static compressive nonlinearity of the power amplifier (PA) and then insert this LUT into the feedback path of a ΔΣ modulator. The oversampled ΔΣ modulator automatically performs both the inversion of the PA nonlinearity and the interpolation between LUT entries, permitting complex modulation strategies to be handled with an absolute minimum of LUT entries and with a dramatically simplified computational structure. The advantages of this architecture over previous methods include: 1) there is no need to explicitly invert the PA nonlinearity, reducing the complexity for the system designer; 2) the LUT training is done with an open-loop method, improving the training speed; 3) there is no need to explicitly employ numerical interpolation between LUT entries; and 4) digital-to-analog converter (DAC)nonlinearity is incorporated into the predistortion, allowing fast low-resolution DACs to be used in the final system. We built a proof-of-concept prototype for a 900-MHz, 27-dBm PA transmitting a 16-ary quadrature amplitude modulation (16-QAM) signal with a bandwidth of 3.4 MHz. The predistortion system reduced out-of-band distortion products by 10 dB and improved the error vector magnitude from 3.5% to 2.0%.

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Section: A Nonlinear Inversion Using a δς Modulatormentioning

confidence: 99%