SIMO Transadmittance Mode Active-C Universal Filter

Abstract

This paper presents two transadmittance mode universal filters having single voltage input and multiple current outputs. The filter employs three multiple output current controlled conveyors (MOCCCII) and two grounded capacitors. It can realize low pass, high pass, band pass, notch and all pass responses. As desired, the input voltage signal is inserted at high impedance input terminal and the output currents are obtained at high impedance output terminals and hence eases cascadability. The filter enjoys low sensitivity performance and low component spread; and exhibits electronic and orthogonal tunability of filter parameters via bias currents of MOCCCII. SPICE simulation results confirm the workability of the proposed structure.

Electronically Tunable Current Controlled Current Conveyor Transconductance Amplifier-Based Mixed-Mode Biquadratic Filter with Resistorless and Grounded Capacitors

“…(1) (2) (3) (4) (5) (6) (7) (8) (9) [13] no no no no no yes yes yes yes [14] no no no no no yes no yes yes [15] no no no no no yes no yes yes [16] no no no yes yes yes yes no yes [17] no yes no no no yes yes no yes [18] no no no no no yes yes no no [19] no no no no no no no no yes [20] yes no no no yes yes yes yes yes [21] yes no no no yes yes yes no yes [22] yes no no no yes yes no no yes [23] yes no no yes yes yes no no yes [24] yes yes no no no yes yes no yes [25] yes yes no yes no yes no no yes [26] yes yes no no yes yes no no yes [27] yes yes no yes yes yes yes no yes this work yes yes yes yes yes yes yes yes yes 1 (1) resistorless and electronically tunable structure; (2) simultaneous realisation of three generic filtering responses in all the four possible modes; (3) capability to realise bandstop and allpass filtering responses in the voltage mode, current mode and transadmittance mode without critical component-matching conditions; (4) low-input and high-output impedances for current signals; (5) high-input impedance for voltage signal; (6) use of only grounded capacitors; (7) orthogonal control of the parameters quality factor (Q) and resonance angular frequency (ω o ) of the filter; (8) independent control of the voltage mode filter gains without affecting the parameters Q and ω o ; and (9) low active and passive sensitivity performances. …”

“…Hence, mixed-mode circuits are worthy of study. Many types of mixed-mode circuits have been developed [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27], utilizing assorted types of active elements such as conventional second-generation current conveyors (CCIIs) [13,14], current feedback operational amplifiers (CFOAs) [15], differential voltage current conveyors (DVCCs) [16], differential difference current conveyors (DDCCs) [17], fully differential current conveyors (FDCCIIs) [18], four-terminal floating nullors (FTFNs) [19], operational transconductance amplifiers (OTAs) [20][21][22], current controlled current conveyors (CCCIIs) [23][24][25], and current controlled current conveyor transconductance amplifiers (CCCCTAs) [26,27]. High [13] 7 CCII 2C + 8R 7 CCII [14] 3 CCII 3C + 4R + 2 switch 3 CCII [15] 4 CFOA 2C + 9R + 1 switch 4 CFOA [16] 3 DVCC 2C + 3R 3 DVCC [17] 3 DDCC 2C + 4R 3 DDCC [18] 1 FDCCII 2C + 3R 2 DDCC [19] 3 FTFN 2C + 3R 3 × 2 CFOA [20] 7 OTA 2C 7 OTA [21] 5 OTA 2C 5 OTA [22] 4 OTA 2C 4 OTA [23] 4 MOCCCII 2C 4 MOCCCII …”