###### Abstract  
A recently developed active building block, namely Voltage Differencing Extra X Current Conveyor (VD-EXCCII), is employed in the design of multi input single output (MISO), electronically tunable mixed-mode universal filter. The filter provides low pass (LP), high pass (HP), band pass (BP), band reject (BR) and all pass (AP) responses in current-mode (CM), voltage-mode (VM), trans-impedance-mode (TIM) and trans-admittance-mode (TAM). The filter employs a single VD-EXCCII, three resistors and two capacitors. Additionally, a CM single input multi output (SIMO) filter can be derived from the same circuit topology by only adding current output terminals. The attractive features of the filter include: (i) the ability to operate in all four modes, (ii) the tunability of the Q factor independent of pole frequency, (iii) the low output impedance for the VM filter, (iv) the high output impedance current output for CM and TAM filters and (v) no requirement for double/negative input signals (voltage/current) for response realization. The VD-EXCCII and its layout is designed and validated in Cadence Virtuoso using 0.18 \(\upmu\)m pdk from Silterra Malaysia with a supply voltage of \(\pm\)1.25 V. The operation of the filter is examined at the 8.0844 MHz characteristic frequency. A non-ideal parasitic and sensitivity analysis is also carried out to study the effect of process and components spread on the filter performance. os 2020 2020  
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 best suited for the task. Numerous exemplary mixed-mode filter structures have been developed that employ different variants of the CM ABBs [8; 9; 10; 11; 12]. The filters can be segregated in two broad categories single input multi output (SIMO) and multi input single output (MISO) type. The MISO filter configuration is one of the most sought after. The filters can be compared on many criteria, some important measures of comparison are: (i) number of ABBs employed, (ii) number of passive components needed, (iii) employment of all grounded passive components, (iv) no requirement for resistive matching except for AP response, (v) provision to control quality factor (\(Q\)) independent of the center frequency, (vi) ability to provide all five filter responses in all four modes of operation, (vii) low output impedance for VM mode, (viii) availability of explicit current output in CM and TAM modes, (ix) no requirement for double/negative input signals (voltage/current), (x) inbuilt tunability and (xi) test frequency. A detailed comparison of the state-of-the-art MISO filters with the proposed design is presented in Table 1 [6; 7; 8; 9; 10; 11; 12; 13; 19; 20; 21; 22; 23; 24; 25; 26; 27; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39] and Table 2 [7; 9; 12; 13; 19; 20; 24; 25; 26; 27; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39]] employ more than one ABB. The designs in [6; 7; 10; 12; 22; 28; 29; 30; 36; 37; 39]] use more than five passive components. The filter structures proposed by [6; 7; 9; 10; 12; 13; 18; 19; 21; 24; 25; 27; 30; 32; 33; 36; 39] do not provide frequency control independent of quality factor. The filter structures [6; 8; 9; 11; 13; 14; 15; 16; 18; 21; 23; 25; 26; 27; 29; 34; 35; 41] do not provide all five filter responses in VM, CM, TAM and TIM operators. The filter structures [6; 7; 10; 12; 14; 16; 22; 25; 27; 29; 30; 34; 36; 37; 39; 41] lack inbuilt tunability property. In addition, only four mixed mode filter structures [14; 25; 27; 40] employing a single ABB can be currently found in the literature. Moreover, among single ABBs based mixed mode filters only [40] provides all five filter responses in all four modes of operation. Furthermore, the design in [40] does not provided VM response at low impedance node. It can be deduced from the literature survey that a limited number of mixed-mode filters are available, and to fill this technological void, additional novel mixed-mode filter structures are needed.