Novel Electronically Tunable Biquadratic Mixed- Mode Universal Filter Capable of Operating in MISO and SIMO Configurations

Abstract

In this paper, a novel electronically tunable biquadratic universal mixed-mode filter is presented. The filter is based on extra X current conveyor transconductance amplifier (EXCCTA), recently introduced by authors. The proposed filter employs two EXCCTAs, two capacitors, a switch, and four resistors. The filter can work in both multi-input-single-output (MISO) and single-input-multi-output (SIMO) configurations without change in its structure. The filter provides all five responses in voltage-mode (VM), current-mode (CM), transimpedance-mode (TIM), and transadmittance-mode (TAM). The attractive features of the filter include (i) ability to operate in both MISO and SIMO configurations in all four modes, (ii) no requirement of capacitive matching, (iii) tunability of quality factor (Q) independent of natural frequency (ω 0) in MISO & SIMO configurations and (iv) no requirement for double/negative input signals (voltage/current) in MISO configuration. The non-ideal gain and sensitivity analysis is also carried out to study the effects of process variations and passive components spread on filter performance. The filter is designed in Cadence Virtuoso using Silterra Malaysia 0.18µm PDK. The complete layout of the EXCCTA is designed and the parasitic extraction is done. The filter is tested at a supply voltage of ±1.25 V and the obtained results validate the theoretical findings.

Voltage Differencing Buffered Amplifier-Based Novel Truly Mixed-Mode Biquadratic Universal Filter with Versatile Input/Output Features

“…The design of mixed-mode universal filters that can provide low-pass (LP), high-pass (HP), band-pass (BP), band-reject (BR), and all-pass (AP) filter responses in CM, VM, TAM, and TIM modes of operation are needed for the mixed signals system architecture [1,2,[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The popular analog building blocks (ABBs) that are used in the design of active filters include operational transconductance amplifier (OTA) [5], second-generation current conveyor (CCII) [6], differential voltage current conveyor (DVCC) [16], extra current conveyor transconductance amplifier (EXCCTA) [21], differential difference current conveyor (DDCCII) [18], fully differential current conveyor (FDCCII) [15], current differencing buffer amplifier (CDBA) [3], etc. The voltage differencing buffered amplifier (VDBA) is another popular ABB that is very simple in design and versatile in realizing numerous applications [3,[22][23][24].…”

Single VDGA-Based Mixed-Mode Universal Filter and Dual-Mode Quadrature Oscillator

“…In many analog signal processing applications, an active mixed-mode universal biquadratic filter (MUBF) with input voltages and/or currents, and output voltages and/or currents, is necessarily required. Over the last decade, numerous universal biquad filter realizations in mixed-mode operations based on different active components have already been developed in [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ].…”

“…However, little effort has been made on the design of DMQO [ 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ]. The realizations in [ 1 , 2 , 4 , 5 , 6 , 7 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 17 , 18 , 19 , 20 , 22 , 23 , 25 , 26 , 29 , 30 , 31 , 33 , 34 , 37 , 39 , 42 , 43 , 44 , 45 , 46 , 47 , 49 , 50 ] need two or more active components. Four or more passive components were used in the circuits described in [ 2 , 3 , 4 , 6 , 8 , 9 , 12 , 13 , 14 , 15 , 16 , …”

Tunable Mixed-Mode Voltage Differencing Buffered Amplifier-Based Universal Filter with Independently High-Q Factor Controllability

“…Additionally, a multitude of the previously discussed mixed-mode filters [3][4][5][6][7][8]10,12,16,18,22,23,25,27,31,35,36,38,41,42,44,45] employ an excessive number (at least five) of passive components. It has been observed that the realizations of [3][4][5][6][7][8]12,[14][15][16]18,[21][22][23][24]26,27,31,[33][34][35][37][38][39][41][42][43]45,46] still used some floating passive components, whic...…”

“…It has been observed that the realizations of [3][4][5][6][7][8]12,[14][15][16]18,[21][22][23][24]26,27,31,[33][34][35][37][38][39][41][42][43]45,46] still used some floating passive components, which is unfavorable from integrated circuit (IC) implementation viewpoint. To obtain various filtering responses or to change the operating mode, the designs in [5,7,27,32,42] need structural modification with a programmable switching technique. This technique needs to employ some external switches, which practically lead to increasing switching noise.…”