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This paper describes the design of a ROM-Less Direct Digital Frequency Synthesizer. The Spurious Free Dynamic Range (SFDR) of the proposed DDFS system is -91.5ldBc. A DDFS IC has been designed in HP 0.5μm standard N-Well CMOS process technology, and that's layout has 2.489mm2area. A 32-bit frequency control word gives a tuning resolution of 0.023Hz at 100MHz sampling rate. This DDFS consume 60mW with 3.3-V supply at 100MHz, and correctly operates up 106MHz.
Date of Conference: 19-21 Dec. 2005