A 900-MHz Direct Delta-Sigma Receiver

in 65-nm CMOS. The receiver for low-band cellular operations achieves NF of 2.3 and 6.2 dB in conventional and delta-sigma modes, respectively,and out-of-band IIP3 up to when the delta-sigma loop is active. The chip consumes 80 mW from a 1.2-V supply. Index Terms—Amplifier, anti-aliasing, cellular radio, CMOS, cognitive radio, continuous time, CR, delta-sigma, direct conver- sion, discrete-time mixing, distortion, filter, IIP3, LNA, Long Term Evolution (LTE), low-noise amplifier, multiband, multistandard, N-path filter, nonlinearity, oversampling, pre-filter, radio architec- tures, radio receivers, receiver, RF ADC, RF sampling, sampling, sampling receiver, SDR, software radio, software-defined radio, SWR, wideband, wideband receiver, Wimax, wireless.

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