Abstract
A 2-GHz direct digital frequency synthesizer (DDFS) chip-set that operates at the very low supply voltage of 2 V is introduced. This microwave DDFS, the first to be fully implemented using LSI technologies, consists of a CMOS DDFS-LSI with an internal 10-bit DAC and Si-bipolar up-converters. To achieve both high purity and low power dissipation, we use a distortion-free up-conversion architecture and an efficient ROM output bit-width reduction technique. The synthesizer achieves a wide spurious-free dynamic range of 53.7 dB and a low power dissipation of less than 160 mW at 2 GHz.
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