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.

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
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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