A 2.5-to-4.5-GHz Switched-LC-Mixer-First Acoustic-Filtering RF Front-End Achieving <6dB NF, +30dBm IIP3 at 1×Bandwidth Offset

Hyungjoo Seo, Jin Zhou

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper describes an agile RF front-end that consists of an N-path switched-LC mixer in silicon followed by an acoustic filter-essentially a mixer-first acoustic-filtering RF front-end. The mixer frequency-translates a sharp but fixed acoustic filtering profile to a much higher and LO-defined tunable frequency while preserves input matching, high-linearity, and introduces minimal loss. In contrast to the existing N-path passive-mixer-first receivers which use active baseband filters after N-path switches, using a single acoustic filter as the N-path load is fraught with fundamental challenges. We introduce on-chip LC-tanks to suppress the acoustic filter out-of-band impedance and an all-passive recombination network to share one acoustic filtering among N paths. A front-end prototype using a CMOS switched-LC passive mixer followed by an off-the-shelf 1.6-GHz surface-acoustic-wave (SAW) filter is designed and optimized. In measurement, the RF front-end operates across 2.5-to-4.5 GHz achieving 5.5-dB NF and +29.4-dBm IIP3 at 1×bandwidth offset.

Original languageEnglish (US)
Title of host publicationRFIC 2020 - 2020 IEEE Radio Frequency Integrated Circuits Symposium
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages283-286
Number of pages4
ISBN (Electronic)9781728168098
DOIs
StatePublished - Aug 2020
Event2020 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2020 - Virtual, Los Angeles, United States
Duration: Aug 4 2020Aug 6 2020

Publication series

NameDigest of Papers - IEEE Radio Frequency Integrated Circuits Symposium
Volume2020-August
ISSN (Print)1529-2517

Conference

Conference2020 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2020
CountryUnited States
CityVirtual, Los Angeles
Period8/4/208/6/20

ASJC Scopus subject areas

  • Engineering(all)

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