Title :
A phase interpolation direct digital synthesizer with an adaptive integrator
Author :
Yamagishi, Akihiro ; Nosaka, Hideyuki ; Muraguchi, Masahiro ; Tsukahara, Tsuneo
Author_Institution :
NTT Telecommun. Energy Labs., Kanagawa, Japan
Abstract :
A phase interpolation direct digital synthesizer (DDS) with an adaptive integrator is described. Unlike a conventional DDS, it does not use ROM and a D/A converter. Therefore less power is dissipated and the maximum speed is increased. The delay time for phase interpolation is generated by the adaptive integrator, which is composed of a capacitance switch array and a current switch array, and by a comparator with constant threshold voltage. The DDS was fabricated on 0.5-μm CMOS process technology. The spurious level is lower than -50 dBc and the power dissipation is 130 mW at a clock frequency of 40 MHz and output frequency of about 19 MHz
Keywords :
CMOS digital integrated circuits; adaptive systems; comparators (circuits); direct digital synthesis; integrating circuits; interpolation; 0.5 micron; 130 mW; 19 MHz; 40 MHz; CMOS process technology; adaptive integrator; capacitance switch array; clock frequency; comparator; constant threshold voltage; current switch array; delay time; output frequency; phase interpolation direct digital synthesizer; power dissipation; spurious level; Adaptive arrays; Capacitance; Delay effects; Frequency; Interpolation; Phased arrays; Read only memory; Switches; Synthesizers; Threshold voltage;
Conference_Titel :
Radio and Wireless Conference, 1999. RAWCON 99. 1999 IEEE
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-5454-0
DOI :
10.1109/RAWCON.1999.810987
