On the design of voltage-controlled sinusoidal oscillators using OTAs

A unified systematic approach to the design of voltage-controlled oscillators using only operational transconductance amplifiers (OTAs) and capacitors is discussed. Two classical oscillator models, i.e. quadrature and bandpass-based, are employed to generate several oscillator structures. They are v...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems 1990-02, Vol.37 (2), p.198-211
Main Authors: Rodriguez-Vazquez, A., Linares-Barranco, B., Huertas, J.L., Sanchez-Sinencio, E.
Format: Article
Language:English
Subjects:
Amplifiers
Applied sciences
Bipolar integrated circuits
Buildings
Capacitors
Circuit properties
CMOS integrated circuits
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Frequency
Gain control
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Operational amplifiers
Silicon
Transconductance
Voltage-controlled oscillators
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Summary:A unified systematic approach to the design of voltage-controlled oscillators using only operational transconductance amplifiers (OTAs) and capacitors is discussed. Two classical oscillator models, i.e. quadrature and bandpass-based, are employed to generate several oscillator structures. They are very appropriate for silicon monolithic implementations. The resulting oscillation frequencies are proportional to the transconductance of the OTA, and this makes the structures well-suited for building voltage controlled oscillators (VCOs). Amplitude stabilization circuits using both automatic gain control (AGC) mechanisms and limitation schemes are presented. The circuits are compatible with the transconductance amplifier capacitor oscillator (TACO). Experimental results from bipolar breadboard and CMOS IC prototypes showing the potential of OTA-based oscillators for high-frequency VCO operation are included.< >
ISSN:0098-4094
1558-1276
DOI:10.1109/31.45712