Abstract
A new universal multiple input multiple output (MIMO) type current-mode biquad employing two dual output current conveyors (DOCCII), one multiple output current controlled current amplifier (MOCCCA) and four passive grounded elements is proposed which can realize all the five basic filtering functions namely, low-pass (LP), high-pass (HP), band-pass (BP), band-stop (BR) and all-pass (AP) in current mode from the same configuration. The centre frequency can be set by the passive elements of the circuit and the quality factor Q0 is electronically tunable through bias currents of the MOCCCA. Therefore, the biquad filter has independent tenability for the and Q0. The active and passive sensitivities of Q0 and are low. The workability of the new configuration has been demonstrated by PSPICE simulation results based upon a CMOS CCII in0.35μm technology.
Highlights
IntroductionChunhua, Hiaguang and Yan presented two new universal multiple input single output (MISO) current-mode (CM) biquadatic filters using one multiple output current controlled current amplifier (MOCCCA), two grounded capacitors (GC) and two grounded resistors (GR) and realize all the five generic filter responses in CM (i.e. with current as input and current as output) [1].The purpose of this paper is to introduce a new configuration which uses exactly same number of active and passive components but in contrast to the circuit of reference [1] realizes a multiple input multiple output (MIMO)-type biquad and does not require any additional hardware to duplicate/invert current inputs which is required in case of MISO-type filters of [1].In the literature there are SIMO-type filter circuits which have three active devices but suffer from the independent tunability as in [2,3,4,5] or have more passive or active elements as in [4,5,6,7,8,9]
The centre frequency o can be set by the passive elements of the circuit and the quality factor Qo is electronically tunable through bias currents of the multiple output current controlled current amplifier (MOCCCA)
The workability of the new configuration has been demonstrated by PSPICE simulation results based upon a CMOS CCII in 0.35 μm technology
Summary
Chunhua, Hiaguang and Yan presented two new universal multiple input single output (MISO) current-mode (CM) biquadatic filters using one MOCCCA, two grounded capacitors (GC) and two grounded resistors (GR) and realize all the five generic filter responses in CM (i.e. with current as input and current as output) [1].The purpose of this paper is to introduce a new configuration which uses exactly same number of active and passive components but in contrast to the circuit of reference [1] realizes a MIMO-type biquad and does not require any additional hardware to duplicate/invert current inputs which is required in case of MISO-type filters of [1].In the literature there are SIMO-type filter circuits which have three active devices but suffer from the independent tunability as in [2,3,4,5] or have more passive or active elements as in [4,5,6,7,8,9]. Chunhua, Hiaguang and Yan presented two new universal multiple input single output (MISO) current-mode (CM) biquadatic filters using one MOCCCA, two grounded capacitors (GC) and two grounded resistors (GR) and realize all the five generic filter responses in CM (i.e. with current as input and current as output) [1]. The purpose of this paper is to introduce a new configuration which uses exactly same number of active and passive components but in contrast to the circuit of reference [1] realizes a MIMO-type biquad and does not require any additional hardware to duplicate/invert current inputs which is required in case of MISO-type filters of [1]. The circuit in [14] has two MO-CCCIIs and one MOCCCA but realizes only SIMO-type biquad
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