Design of a 2.4 GHz CMOS frequency-hopped RF transmitter IC

A 2.4 GHz frequency-hopped RF transmitter IC has been designed and implemented in a 0.5 /spl mu/m CMOS. This frequency hopped spread spectrum (FH/SS) transmitter is intended for use in a wide variety of indoor/outdoor portable wireless applications in the 2.4-2.4835 GHz ISM frequency band. The transmitter is capable of frequency and phase modulation. The key elements in the transmitter are: a quadrature direct digital synthesizer, digital-to-analog converters, low-pass filters, upconversion mixers and 90/spl deg/ phase splitter.