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...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2004 |
| País: | España |
| Institución: | Universidad de Sevilla (US) |
| Repositorio: | idUS. Depósito de Investigación de la Universidad de Sevilla |
| OAI Identifier: | oai:idus.us.es:11441/76164 |
| Acceso en línea: | https://hdl.handle.net/11441/76164 https://doi.org/10.1109/TCSI.2004.823673 |
| Access Level: | acceso abierto |
| Palabra clave: | 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 |
| Sumario: | 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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