2002 · 47 citations · 3 references
EngineeringCommunicationElectrical EngineeringAnalog ElectronicsLow-power DesignMicroelectronicsAnalog Integrated CircuitsCmos Circuit DesignDigital Integrated CircuitsMixed-signal Integrated Circuit DesignRadio-frequency Integrated CircuitsWaveform GeneratorsCmos Analog Integrated CircuitsCmos Radio-frequency CircuitsDirect Digital SynthesisFrequency SynthesisFrequency SynthesizersLow-power Cmos DesignWireless Data TransmissionWireless Transmission
A low-power monolithic 1 /spl mu/m CMOS IC generates a 26 MHz-wide single-sideband, frequency-hopped spread-spectrum waveform for wireless transmission in the 902-928 MHz unlicensed ISM band. A direct digital frequency synthesizer (DDFS) on this IC produces 10b samples of sine and cosine waveforms whose frequency is selected with an 11b input word, followed by an on-chip 10b D/A converter (DAC) to convert the DDFS output into a sampled-data analog signal. Simplifications in architecture and circuits reduce dissipation of this 2.9/spl times/4.9 mm/sup 2/ IC to 40 mW at 40 MHz with 3 V supply.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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