Title :
Programmable sine wave generator employing a mismatch-shaping DAC
Author :
Hernandez, Luis ; Quesada, Alejandro
Author_Institution :
Dept. of Electr., Electron. & Autom., Carlos III Univ., Madrid, Spain
Abstract :
A programmable signal generator is described along with some experimental results. The generator may be used as the reference of a PLL frequency synthesizer. It consists of a digital band-pass sigma-delta oscillator and a low-resolution D/A converter employing a dynamic element-matching algorithm. The prototype uses an inexpensive, untrimmed analog circuit to provide a variable frequency sinusoid in the MHz range with 92 dB of SFDR. The hardware complexity of both the analog and digital circuits is smaller than an equivalent DDS-based generator
Keywords :
digital circuits; digital-analogue conversion; frequency synthesizers; programmable circuits; sigma-delta modulation; waveform generators; DAC; FPGA; PLL frequency synthesizer reference; digital band-pass sigma-delta oscillator; dynamic element-matching algorithm; low-resolution D/A converter; mismatch-shaping DAC; programmable sine wave generator; untrimmed analog circuit; variable frequency sinusoid; Analog circuits; Delta-sigma modulation; Digital circuits; Frequency synthesizers; Hardware; Heuristic algorithms; Oscillators; Phase locked loops; Prototypes; Signal generators;
Conference_Titel :
Electronics, Circuits and Systems, 1998 IEEE International Conference on
Conference_Location :
Lisboa
Print_ISBN :
0-7803-5008-1
DOI :
10.1109/ICECS.1998.813287
