Title :
CMOS OTA-C high-frequency sinusoidal oscillators
Author :
Linares-Barranco, Bernabé ; Rodriguez-Vazquez, Angel ; Sánchez-Sinencio, Edgar ; Huertas, Jose L.
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
fDate :
2/1/1991 12:00:00 AM
Abstract :
Several topology families are given to implement practical CMOS sinusoidal oscillators by using operational transconductance amplifier-capacitor (OTA-C) techniques. Design techniques are proposed taking into account the CMOS OTA´s dominant nonidealities. Building blocks are presented for amplitude control, both by automatic gain control (AGC) schemes and by limitation schemes. Experimental results from 3- and 2-μm CMOS (MOSIS) prototypes that exhibit oscillation frequencies of up to 69 MHz are obtained. The amplitudes can be adjusted between 1 V peak to peak and 100 mV peak to peak. Total harmonic distortions from 2.8% down to 0.2% have been measured experimentally
Keywords :
CMOS integrated circuits; automatic gain control; gain control; network topology; operational amplifiers; radiofrequency oscillators; 1 to 100 V; 2 micron; 3 micron; 69 MHz; AGC; CMOS; MOSIS; OTA-C; RF type; amplitude control; automatic gain control; high-frequency sinusoidal oscillators; limitation schemes; operational transconductance amplifier-capacitor; topology families; Automatic control; Distortion measurement; Frequency; Gain control; Operational amplifiers; Oscillators; Prototypes; Topology; Total harmonic distortion; Transconductance;
Journal_Title :
Solid-State Circuits, IEEE Journal of
