Component quantization effects on continuous-time filters

Recent trends in precision continuous-time active filter design use post fabrication tunable structures. Digitally adjustable quantization components are often used as tunable elements. It is shown that the trim resolution of continuous-time filters is strongly dependent upon the circuit topology and component quantization schemes. Tradeoffs between number of bits, quantization schemes and resolution for some representative bandpass active filter structures are addressed. It is shown that the optimal circuit structure and component quantization scheme are application dependent.