, Anindya Sundar Dhar , Sunandan Bhunia DIRECT DIGITAL FREQUENCY SYNTHESIZER DESIGN WITH MODIFIED PARABOLIC METHOD APPROXIMATION METHOD
نویسندگان
چکیده
The efficiency of the traditional DDFS is greatly depends on the large size of memory. The ROM less architecture for generating sine wave and its necessary corrective measure based on parabola has already been developed. This paper proposes a modified parabola by adding a triangular wave to achieve a sine wave with less distortion. This architecture gives better performance.
منابع مشابه
Design and Simulation of a Modified 32-bit ROM-based Direct Digital Frequency Synthesizer on FPGA
This paper presents a modified 32-bit ROM-based Direct Digital Frequency Synthesizer (DDFS). Maximum output frequency of the DDFS is limited by the structure of the accumulator used in the DDFS architecture. The hierarchical pipeline accumulator (HPA) presented in this paper has less propagation delay time rather than the conventional structures. Therefore, it results in both higher maximum ope...
متن کاملSine Approximation for Direct Digital Frequency Synthesizers and Function Generators
There are several compression methods for phase to amplitude converter for sine function. In this paper, the linear and parabolic approximation of equi-section division utilizing the symmetry property and amplitude approximation of a sinusoidal waveform for direct digital frequency synthesizer (DDS) and also for other waveform applications, e.g. function generators and telecommunication devices...
متن کاملReduced-Memory Direct Digital Frequency Synthesizer Using Parabolic Initial Guess
Based on the parabolic approximation, which was recently introduced by the authors, a new architecture for sine-output direct digital frequency synthesizers has been developed. Due to using this approximation, and also considering several memory-reduction techniques, the proposed architecture is so designed that needs only 728 bits read-only memory for mapping a 12-bit phase address to 10-bit s...
متن کاملA Novel Approach for Fast and Accurate Mean Error Distance Computation in Approximate Adders
In error-tolerant applications, approximate adders have been exploited extensively to achieve energy efficient system designs. Mean error distance is one of the important error metrics used as a performance measure of approximate adders. In this work, a fast and efficient methodology is proposed to determine the exact mean error distance in approximate lower significant bit adders. A detailed d...
متن کاملA ROM-Less Direct Digital Frequency Synthesizer Based on Bezier Curve Approximation
This paper describes the design and implementation of a ROM-Less Direct Digital Frequency Synthesizer (DDS) using Bezier curve approximation. With Bezier curve approximation, phase values between 0 to π are mapped to sine amplitudes. Then, half wave symmetry of sine wave is exploited to construct full sine wave. The proposed approximation introduces maximum error of 7.9×10, which is equivalent ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2012