Analysis of a Switched Passive Input Network Based on a Surface Acoustic Wave Resonator for 433 MHz Wakeup Receivers

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A switched passive input network (SPIN) for 433 MHz ISM band wakeup receivers with on-off keying (OOK) is discussed. It is based on a surface acoustic wave (SAW) resonator which is operated in a switched mode. The signal energy accumulated in the SAW resonator during a charge period appears as a voltage pulse, exhibiting up to 24 dB (measured) voltage gain referred to the open-circuit antenna port voltage. Input signal and noise are narrowband band-pass filtered with 364 kHz bandwidth (measured), which is favourable compared to conventional input matching networks in the crowded 433 MHz ISM band. In this paper, we present an analytical expression for the transient voltage at the switched passive input network for arbitrary parallel resistances. The passive voltage gain is calculated and compared to simulation results and measurements of a trial system.


Original languageEnglish
Title of host publication2023 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)
Number of pages3
ISBN (print)979-8-3503-2068-8
Publication statusPublished - 9 Nov 2023


Title2023 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference
SubtitleMicrowave, terahertz and optics: towards smart innovations
Abbreviated titleIMOC 2023
Conference number20
Duration5 - 9 November 2023
LocationCentre Tecnològic de Telecomunicacions de Catalunya

External IDs

ORCID /0000-0002-5439-1401/work/151434255
ORCID /0000-0001-6778-7846/work/151436267
Scopus 85184347076



  • Antenna measurements, Band-pass filters, Voltage measurement, Surface acoustic waves, Switches, Receivers, Gain measurement