Title :
Precise 90° quadrature current-controlled oscillator tunable between 50-130 MHz
Author :
Linares-Barranco, B. ; Serrano-Gotarredona, T. ; Ramos-Martos, J. ; Ceballos-Cáceres, J. ; Mora, J. Miguel ; Linares-Barranco, A.
Author_Institution :
Inst. de Microelectron. de Sevilla, Spain
fDate :
5/29/2003 12:00:00 AM
Abstract :
A VLSI continuous time sinusoidal OTA-C quadrature oscillator fabricated in a standard double-poly 0.8 μm CMOS process is presented. The oscillator is tunable in the frequency range from 50-130 MHz. The two phases produced by the oscillator show an extremely low phase difference error (less than 2° over the whole frequency range). A novel current mode amplitude control scheme is developed that allows for very small amplitudes. Experimental results are provided.
Keywords :
CMOS analogue integrated circuits; VHF oscillators; circuit tuning; continuous time systems; current-mode circuits; integrated circuit layout; network topology; variable-frequency oscillators; 0.8 micron; 50 to 130 MHz; 90° quadrature current-controlled oscillator; VLSI continuous time sinusoidal OTA-C quadrature oscillator; current mode amplitude control scheme; double-poly 0.8 μm CMOS process; low phase difference error; oscillator phases; tunable oscillator;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20030558
