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A simple quadrature oscillator for the built-in self-test (BIST) of integrated analogue filters is proposed. A new hardware-efficient approach for amplitude control is described, the main assets being: (i) the technique requires little hardware, which makes it very useful for BIST; (ii) the oscillation amplitude is well defined, and (iii) the distortion-level introduced by the amplitude control loop is under the control of the designer.
References
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Linares-Barranco, B., Serrano-Gotarredona, T., Ramos-Martos, J., Ceballos-Cceres, J., Mora, J.M., Linares-Barranco, A.: `A precise 90° quadrature OTA-C VCO between 50–130 MHz', IEEE Int. Symp. on Circuits and Systems, (ISCAS), 2004, Vancouver, BC, Canada, p. 541–544.
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K. Martin
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Complex signal processing is not complex.
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L.B. Oliveira ,
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I.M. Filanovsky ,
C.J.M. Verhoeven ,
M.M. Silva
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(2008)
Analysis and design of quadrature oscillators.
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2010.3297
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