Accurate automatic tuning circuit for bipolar integrated filters

Heij de, Wim J.A. and Hoen, Klaas and Seevinck, Evert (1990) Accurate automatic tuning circuit for bipolar integrated filters. In: IEEE International Symposium on Circuits and Systems, ISCAS 1990, 1-3 May 1990, New Orleans, USA.

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Abstract:	An accurate automatic tuning circuit for tuning the cutoff frequency and Q-factor of high-frequency bipolar filters is presented. The circuit is based on a voltage controlled quadrature oscillator (VCO). The frequency and the RMS (root mean square) amplitude of the oscillator output signal are locked to the frequency and the RMS amplitude of a reference signal, respectively. Special attention is paid to the actual Q-factor in the oscillator. Experimental results for a breadboard circuit operating from 136 to 317 kHz are presented
Item Type:	Conference or Workshop Item
Copyright:	©1990 IEEE
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Integrated Circuit Design (ICD)
Link to this item:	http://purl.utwente.nl/publications/17033
Official URL:	http://dx.doi.org/10.1109/ISCAS.1990.112327
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