A precise 90º quadrature OTA-C oscillator tunable in the 50-130-MHz range

We present a very-large-scale integration continuous-time sinusoidal operational transconductance amplifiers quadrature oscillator fabricated in a standard double-poly 0.8-μm CMOS process. The oscillator is tunable in the frequency range from 50 to 130 MHz. The two phases produced by the oscillator...

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Bibliographic Details
Authors: Linares Barranco, Bernabé, Serrano Gotarredona, María Teresa, Ramos Martos, J., Ceballos Cáceres, Joaquín Francisco, Linares Barranco, Alejandro
Format: article
Status:Versión aceptada para publicación
Publication Date:2004
Country:España
Institution:Universidad de Sevilla (US)
Repository:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/76164
Online Access:https://hdl.handle.net/11441/76164
https://doi.org/10.1109/TCSI.2004.823673
Access Level:Open access
Keyword:Amplitude control
Analog very large-scale integration (VLSI)
Impedance probe
Multiphase oscillators
Operational transconductance amplifiers (OTA)-C
Oscillator stability
Phase noise
Quadrature oscillators
Sinusoidal oscillators
Transconductance-capacitance oscillators
Description
Summary:We present a very-large-scale integration continuous-time sinusoidal operational transconductance amplifiers quadrature oscillator fabricated in a standard double-poly 0.8-μm CMOS process. The oscillator is tunable in the frequency range from 50 to 130 MHz. The two phases produced by the oscillator show a low-quadrature phase error. A novel current-mode amplitude control scheme is developed that allows for very small amplitudes. Stability of the amplitude control loop is studied as well as design considerations for its optimization. Experimental results are provided.

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