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This single-chip RF-transceiver for DECT provides a complete transmission and reception radio interface between the antenna and the baseband digital bitstream. Integrated synthesizer, zero-intermediate frequency (zero-IF) receiver topology and digital modulation and demodulation, minimizes the number of external components: only an antenna filter and switch, a power amplifier, and decoupling. The local oscillator (LO) synthesizer uses a double-frequency voltage-controlled oscillator (VCO) with integrated spiral coils and digital self-calibration for process variations. The integrated phase-locked loop (PLL) synthesizer has a fast settling and stays closed-loop for the direct-upconversion transmitter. This allows non-blind-slot operation in high-end base stations and multislot operation for high-speed asymmetrical data links.