High-Q factor circuit with reduced sensitivity

An active network is suggested that uses one differential-input operational amplifier and is suitable for realising high-Q factor second-order bandpass functions. Its Q sensitivity to component values is found to be less than the optimum Q sensitivities of the corresponding networks of Huelsman and Antoniou. The network has been used to realise a sixth-order bandpass filter in three cascaded stages. Experimental results are given.