Design and Implementation of a 16-bit Flexible ROM-less Direct Digital Synthesizer in FPGA and CMOS 90nm Technology
Author | : Sunny Raj Dommaraju |
Publisher | : |
Total Pages | : 63 |
Release | : 2013 |
ISBN-10 | : OCLC:1038072794 |
ISBN-13 | : |
Rating | : 4/5 (94 Downloads) |
Download or read book Design and Implementation of a 16-bit Flexible ROM-less Direct Digital Synthesizer in FPGA and CMOS 90nm Technology written by Sunny Raj Dommaraju and published by . This book was released on 2013 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: A ROM-less direct digital synthesizer architecture is presented in this thesis. This architecture eliminates the ROM-based phase to sine wave amplitude converter, which is a bottleneck for pushing clock frequencies into the gigahertz range. The design consists of a 16-bit phase accumulator, a set of 18 band pass finite impulse response filters, a 12-bit digital to analog converter and a low pass filter to produce a sine wave with output frequencies ranging from 36 MHz to 72 MHz with a resolution of 3.05 kHz and a 55 dB spur free dynamic range. The same hardware can be used to achieve output frequency ranging from hertz to gigahertz and a 191 Hz resolution by changing the clock frequency. A resolution of 0.05 Hz can be achieved by using a 32-bit phase accumulator. The average phase noise obtained was -87 dBc/Hz at 100 kHz offset, -118 dBc/Hz at 1 MHz offset and -151 dBc/Hz at 5 MHz offset. This design was implemented on Virtex-6 FPGA. The analysis results of FPGA data show that the proposed design is an effective alternative. An ASIC design was also implemented in CMOS 90nm technology to reach higher frequency ranges.