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A wide-tuning-range low-power sigma-delta-based direct-RF-to-digital receiver architecture is implemented in 65 nm CMOS. A flat signal transfer function is chosen to support wide-frequency-range radios. A multilevel (two-bit) nonreturn-to-zero DAC improves jitter immunity to enable a high dynamic range, and, with a class-AB low-noise transconductance amplifier, guarantees a highly linear front end...
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