A Passive-Mixer-First Acoustic-Filtering Chipset Using Mixed-Domain Recombination

Hyungjoo Seo, Mengze Sha, Jin Zhou

Research output: Contribution to journalArticlepeer-review


A mixer-first acoustic-filtering high-intermediate-frequency (IF) superheterodyne radio frequency (RF) front end is presented, which utilizes a mixed-domain recombination architecture. By having a set of commutated switches or essentially a passive mixer before fixed-frequency acoustic filters, mixer-first acoustic filtering enables a widely tunable RF for the front end while preserving the acoustic filter's high-order filtering response and high linearity. Compared to the prior work that uses IF-only recombination, the proposed IF-and-baseband mixed-domain recombination supports a wider instantaneous bandwidth (BW) and higher RF while reducing the number of IF passive components that are lossy and bulky. A proof-of-concept chipset is demonstrated; it consists of an RF front-end N-path commutated-LC passive mixer and an IF in-phase and quadrature (I-Q)-mismatch-compensating complex receiver in 65-nm CMOS as well as two 2.6-GHz Qorvo QPQ1285 bulk-acoustic wave (BAW) filters. In measurement, the chipset operates across 3.5-6.5 GHz RF with a 160-MHz instantaneous BW, 10-dB noise figure (NF) at 3.5-GHz RF, and an out-of-band IIP3 of +27 dBm at 1 × BW offset.

Original languageEnglish (US)
Pages (from-to)3346-3360
Number of pages15
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number7
StatePublished - Jul 1 2022


  • Acoustics
  • Bulk-acoustic wave (BAW)
  • filter
  • Impedance
  • impedance aliasing
  • interference
  • linearity
  • Linearity
  • mixer
  • Mixers
  • Radio frequency
  • receiver.
  • Resonant frequency
  • Resonators
  • Interference
  • Mixer
  • Impedance aliasing
  • Receiver
  • Filter

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Radiation
  • Electrical and Electronic Engineering


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