Title :
A novel versatile modulator circuit
Author :
Tuwanut, Panwit ; Koseeyaporn, Jeerasuda ; Wardkein, Paramote
Author_Institution :
Dept. of Telecommun., King Mongkut´´s Inst. of Technol., Bangkok, Thailand
Abstract :
In this paper, a novel versatile modulator that can function either as delta modulator, sigma-delta modulator, amplitude modulator and frequency modulator is proposed. The principle of the proposed scheme is based on Schmitt-trigger circuit and composed of a few components: three OTAs, one capacitor and two resistors. The advantage of this circuit is that the clock (carrier) signal employed for modulation is inherent in the circuit. The modulating signal is therefore an external input requirement. Based on the compactness of the circuit, it is suitable for IC realization. The computer simulation demonstrates the results which agree well with the theoretical analysis.
Keywords :
capacitors; modulators; operational amplifiers; resistors; sigma-delta modulation; trigger circuits; OTA; Schmitt-trigger circuit; amplitude modulator; capacitor; clock signal; computer simulation; frequency modulator; resistors; sigma-delta modulator; signal modulation; versatile modulator circuit; Amplitude modulation; Capacitors; Circuits; Clocks; Delta modulation; Delta-sigma modulation; Digital modulation; Frequency modulation; Pulse width modulation; Resistors;
Conference_Titel :
Communications and Information Technology, 2005. ISCIT 2005. IEEE International Symposium on
Print_ISBN :
0-7803-9538-7
DOI :
10.1109/ISCIT.2005.1567044
