Abstract
Techniques are presented for the design of a second-order MOSFET-C filter which can be programmed by two external reference frequencies. Two identical automatic tuning circuits are used to achieve programmability of the centre frequency, peak gain and quality factor Q, with excellent stability against environmental variations. This filter, which consists of non-inverting and inverting integrators, can provide several kinds of filtering functions. As an example, a bandpass filter with continuously and independently variable centre frequency ω0 and quality factor Q is designed. Experimental results show that Q can be varied from 2 to 200 while the centre frequency can be varied from 60 to 240 kHz.
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