Synchronous data recovery in RF communication channels

Synchronous data recovery schemes over narrowband radio-frequency (RF) data channels based on phase-shift keying and frequency-shift keying are described. Experimental systems were breadboarded with 50-MHz analog RF circuits fabricated using a 2-μm gate double-poly CMOS technology. Most circuits are developed for quadrature RF data transceiver applications in the 50-MHz commercial RF band, and an experimental frequency-aided Costas loop exhibits a 1-mV input sensitivity with an on-chip voltage-controlled oscillator. Developed circuits are applicable to general phase-locked-loop systems for data and clock recovery in VLSI chips. The 50-MHz quadrature RF section occupies 0.55 mm/SUP 2/ and consumes 150 mW with a 5-V supply.