Title :
Analogue interpolation based direct digital frequency synthesis
Author :
McEwan, Alistair ; Collins, Steve
Author_Institution :
Dept. of Eng. Sci., Oxford Univ., UK
Abstract :
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.
Keywords :
CMOS integrated circuits; circuit simulation; digital-analogue conversion; direct digital synthesis; integrated circuit design; interpolation; CMOS differential current switch; analogue interpolation based DDFS; direct digital frequency synthesis; low-power ROMless DDFS; nonlinear DAC; output value interpolation; spectral purity; Bandwidth; Degradation; Frequency synthesizers; Interpolation; Quantization; Read only memory; Signal synthesis; Switches; Table lookup; Voltage;
Conference_Titel :
Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on
Print_ISBN :
0-7803-7761-3
DOI :
10.1109/ISCAS.2003.1205640
