A Fully Integrated Wideband FM Transceiver for Low Data Rate

Abstract

A frequency-agile FM-UWB transceiver (Tx/Rx) with full on-chip calibration aimed at low data rate autonomous wireless sensing applications is described. The subcarrier VCO, 3-phase CCO, and frequency-tripling PA in the transmit path produce a wideband, double-FM output at 10.1 dBm-pk (FCC compl iant). A tunable LNA, envelope detector , limiter, and FSK demodulator comprise the receiver. Digitally programmable matching networks at the PA output and LNA input facilitate independe nt tuning of Tx and Rx across the 3–5 GHz band. An on-chip SAR-FLL con- trolling 5 DACs (3 I-DACs and 2 C-DACs) performs a full Tx/Rx c a l i b r a t i o ni nl e s st h a n2m s .D e s i g n e df o rc o n t inuous operation at 100 kb/s, measured Rx sensitivity is 80.5 dBm (10 BER), and average Tx/Rx energy efficiency is 6 nJ/bit. Total dissipation for the 0.9 mm I Ci m p l e m e n t e di n9 0n mR F - C M O Sis 630 µW in Tx and 580 µW in Rx mode from a 1 V supply.