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- W3147987962 abstract "A 16-element fully integrated 28-GHz digital beamformer combines with a custom eight-layer LTCC substrate with a 4 × 4 patch antenna array for a complete 16-element single-chip 28-GHz millimeter-wave (mm-wave)-to-digital beamforming system. Sixteen-element digital beamforming in a single integrated circuit (IC) represents an excellent tradeoff between die size, signal loss, and I/O routing complexity. Per-element RX slices with an inductor-less mm-wave front end and 4 × parallel continuous-time bandpass delta-sigma analog-to-digital conversion (ADC) arrays enable compact mm-wave-to-digital conversion. The 4 × parallel ADC array provides in-built finite-impulse response (FIR) filtering for additional harmonic suppression and anti-alias filtering. ADC sampling of a high (1 GHz) IF facilitates single-phase mm-wave local oscillator (LO) routing and moves the I/Q mixing into the digital domain. Optimum bump and RX slice placement shortens LO and mm-wave signal routing and reduces signal loss. Bit-stream processing (BSP) takes advantage of the narrow bit-width raw outputs of the RX slices to implement digital beamforming with area- and energy-efficient MUXes. The prototype 16-element beamformer generates four independent, simultaneous beams. Over-the-air measurements confirm accurate 3-D beam patterns and indicate a measured overall noise figure of 7 dB and QAM-4 error vector magnitude (EVM) of -18 dB." @default.
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- W3147987962 date "2021-05-01" @default.
- W3147987962 modified "2023-10-14" @default.
- W3147987962 title "A 16-Element Fully Integrated 28-GHz Digital RX Beamforming Receiver" @default.
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- W3147987962 doi "https://doi.org/10.1109/jssc.2021.3067504" @default.
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