Title :
10 MHz CMOS OTA-C voltage-controlled quadrature oscillator
Author :
Linares-Barranco, B. ; Rodriguez-Vazquez, Angel ; Sanchez-Sinencio, Edgar ; Huertas, Jose Luis
Author_Institution :
Texas A&M Univ., College Station, TX, USA
fDate :
6/8/1989 12:00:00 AM
Abstract :
A quadrature-type voltage-controlled oscillator with operational transconductance amplifiers and capacitors (OTA-C) is presented. A monolithic integrated CMOS test circuit is introduced to verify theoretical results. The attainable frequency range of oscillation of the chip test circuit is 3-10.34 MHz. The total harmonic distortion (THD) is 0.20-1.87% for corresponding peak-to-peak amplitude voltages between 100 mV and 1 V. This amplitude can be controlled either by using a diode connection of two MOS transistors or a proposed nonlinear resistor.
Keywords :
CMOS integrated circuits; operational amplifiers; variable-frequency oscillators; 3 to 10.34 MHz; diode connection; monolithic integrated CMOS test circuit; nonlinear resistor; operational transconductance amplifiers; peak-to-peak amplitude voltages; total harmonic distortion; voltage-controlled quadrature oscillator;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19890517
