A Novel Second-Order All-Pass Filter Using Square-Root Domain Blocks

In this study, a new second order all-pass filter is synthesized in the square-root domain by using the state- space method. The proposed second order all-pass filter is constituted by current mirrors, current sources, current- mode square-root circuits and capacitors. The pole fre- quency of the filter can be tuned electronically by varying the values of the current sources of this circuit. The filter is simulated in PSpice using 0.35m CMOS technology pa- rameters. Quality factor of the circuit is selected as 5 and supply voltage is set to 2.7 V. The simulation results show that the proposed circuit has the merits of electronic tun- ability. We also performed noise, THD and Monte-Carlo analyses. Various simulation results are presented to show the effectiveness of the proposed circuit.

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