Title :
A Method Of Amplitude-Frequency Characteristic Compensation About DDS Signal Source
Author :
Ke, Liu ; Shulin, Tian ; Yindong, Xiao
Author_Institution :
Univ. of Electron. Sci. & Technol., Chengdu
fDate :
Aug. 16 2007-July 18 2007
Abstract :
DDS (direct digital synthesis) is widely applied in signal generator. In this paper, amplitude-frequency characteristic of DDS signal after D/A conversion (DAC) was analyzed. Then a method for improving amplitude-frequency characteristic was put forward. The method is based on characteristic of LC parallel circuits that signal can be amplified at resonance frequency. By this method, amplitude attenuation caused by DAC is compensated; amplitude frequency characteristic of DDS signal is improved. The experiment results indicate that amplitude flatness of arbitrary waveform generator increases about 2 dB at 0 Hz-40 MHz.
Keywords :
digital-analogue conversion; direct digital synthesis; waveform generators; D/A conversion; DDS signal source; LC parallel circuits; amplitude attenuation; amplitude frequency characteristic compensation; arbitrary waveform generator; direct digital synthesis; frequency 0 Hz to 40 MHz; resonance frequency; signal generator; Clocks; Frequency synthesizers; Low pass filters; RLC circuits; Resonance; Resonant frequency; Sampling methods; Signal generators; Signal synthesis; Table lookup;
Conference_Titel :
Electronic Measurement and Instruments, 2007. ICEMI '07. 8th International Conference on
Conference_Location :
Xi´an
Print_ISBN :
978-1-4244-1136-8
Electronic_ISBN :
978-1-4244-1136-8
DOI :
10.1109/ICEMI.2007.4351264
