Abstract
This article presents a low-power passive mixer-first receiver (MFRX) with an N-path harmonic-rejection (HR) transformer-mixer for narrowband Internet-of-Everything (IoE) applications. Composed of only switches and capacitors, the N-path HR transformer-mixer integrates the behavior of a transformer and harmonic recombination into the passive mixer itself, providing voltage gain, HR, and high- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$Q$</tex-math> </inline-formula> filtering before any active components. A prototype RX in 22-nm fully-depleted silicon-on-insulator (FD-SOI) occupies 0.064 mm <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$^\mathbf{2}$</tex-math> </inline-formula> and operates from 300 MHz to 3.0 GHz while consuming 0.6–1.8 mW. It achieves 3.4–4.8-dB noise figure (NF), 14–18-dBm out-of-band (OB)-input-referred third-order intercept point (IIP3), <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$-5$</tex-math> </inline-formula> –0-dBm OB-B1dB, <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$-8$</tex-math> </inline-formula> / <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$-3$</tex-math> </inline-formula> -dBm H3/H5-B1dB, and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$<$</tex-math> </inline-formula> 1-dB NF degradation with a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$-15$</tex-math> </inline-formula> -dBm OB blocker.
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