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Analogue interpolation based direct digital frequency synthesis

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2 Author(s)
McEwan, A. ; Dept. of Eng. Sci., Oxford Univ., UK ; Collins, S.

A low-power ROM-less direct digital frequency synthesis (DDFS) system that exceeds the spectral purity of existing low-power DDFS systems by approximately 10 dB is presented. The design applies an analogue voltage to the CMOS differential current switch in one cell of a non-linear DAC to interpolate between the output values which would be available from a conventional non-linear DAC.

Published in:

Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on  (Volume:1 )

Date of Conference:

25-28 May 2003