A New Trans-admittance-Mode Biquad Filter Suitable for Low Voltage Operation

The trans-admittance-mode (TAM) might act as a transforming bridge for voltage-mode to current-mode conversion. In this study a new low voltage operated electronically tunable TAM biquad filter structure realizing all the seven standard filtering functions namely; low-pass (LP), band-pass (BP), high-pass (HP), regular-notch (RN), low-pass-notch (LPN), high-pass-notch (HPN) and all-pass (AP) from the same configuration through appropriate selection of voltage input signals is presented. The proposed circuit structure comprises of three current conveyor trans-conductance amplifiers (CCTAs). Moreover, the new biquad filter structure still enjoys (i) realizations require neither inverted, nor scaled voltage input(s), (ii) the employment of two capacitors, hence providing canonical structure, (iii) the pole frequency can be tuned electronically, and (iv) possesses low incremental active and passive sensitivity performance and useful in low-voltage low-power applications. Personal simulation program with integrated circuit emphasis (PSPICE) simulation results using 0.25 mu m taiwan semiconductor manufacturing company (TSMC) complementary metal-oxide semiconductor (CMOS) parameters verify the theoretical analysis.