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

fYear

2007

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICEMI.2007.4351264

Filename

4351264