Title :
Generation and design of sinusoidal oscillators using OTAs
Author :
Linares-Barranco, B. ; Rodrìguez-Vázquez, A. ; Huertas, J.L. ; Sánchez-Sinencio, E. ; Hoyle, J.J.
Author_Institution :
Dept. of Electron. & Electromagn., Seville Univ., Spain
Abstract :
The design of voltage-controlled oscillators (VCOs) using operational transconductance amplifiers (OTAs) is discussed. Several oscillator structures are proposed. They use only OTAs and capacitors (OTA-C) and are very appropriate for silicon monolithic implementations. The resulting oscillation frequencies are proportional to the transconductance of the OTA and this makes the reported structures well suited for building VCOs. Amplitude stabilization circuits using both automatic gain control (AGC) mechanisms and limitation schemes that are compatible with OTA-C oscillators are studied. Experimental results from breadboard prototypes are included, showing the good potential of OTA-based oscillators for high-frequency VCO operation.<>
Keywords :
automatic gain control; nonlinear network synthesis; operational amplifiers; variable-frequency oscillators; AGC; VFO; automatic gain control; high-frequency VCO operation; limitation schemes; monolithic implementations; operational transconductance amplifiers; sinusoidal oscillators; voltage-controlled oscillators; Buildings; Capacitors; Circuits; Frequency; Gain control; Operational amplifiers; Prototypes; Silicon; Transconductance; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 1988., IEEE International Symposium on
Conference_Location :
Espoo, Finland
DOI :
10.1109/ISCAS.1988.15536
