Abstract

The MOSFET-C continuous-time biquadratic building block proposed by A.E. Said et al. (1991) does not realize all generic transfer functions. When implemented in a high-order realization, it requires the addition of unity gain inverters. A new biquad circuit is proposed to overcome the above problems. It achieves a complete MOS nonlinearity cancellation and does not require the use of fully balanced op amps. An example of a second-order biquad filter is analyzed using SPICE. A high-order implementation of the proposed biquad is also given. All design steps are matched with the 3.3- mu m CMOS design rules. >

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