Sajai Vir Singh

Electronically tunable low-voltage mixed-mode universal biquad filter

This study presents an electronically tunable low-voltage mixed-mode universal biquad filter. The proposed filter employs only three current controlled current conveyor trans-conductance amplifiers (CCCCTAs) and two grounded capacitors. The proposed filter can realise low pass, band pass and high pass responses in all the four possible modes, that is, voltage-mode, current-mode, trans-admittance-mode and trans-impedance-mode from the same configuration. The filter can also realise regular notch, low-pass notch, high-pass notch and all pass responses in current and trans-admittance-mode, with interconnection of relevant output currents. The filter parameters namely pole frequency, quality factor, bandwidth and filter gains can be tuned electronically. Moreover, the circuit parameters such as pole frequency and quality factor can be simultaneously current controlled without affecting bandwidth. Effects of non-idealities and parasitic are also discussed. The circuit possesses low active and passive sensitivity and can be operated at low power supply (±1 V). The validity of the proposed filter is verified through computer simulations using PSPICE, the industry standard tool. Possible experimental setup for CCCCTA using commercial available integrated circuits is further discussed.

Universal Current-Controlled Current-Mode Biquad Filter Employing MO-CCCCTAs and Grounded Capacitors

This paper presents a universal current-controlled current-mode biquad filter employing current controlled current conveyor trans-conductance amplifiers (CCCCTAs). The proposed filter employs only three MO- CCCCTAs and two grounded capacitors. The proposed filter can simultaneously realize low pass (LP), band pass (BP), high pass (HP), band reject (BR) and all pass (AP) responses in current form by choosing appropriate current output branches. In addition, the pole frequency and quality factor of the proposed filter circuit can be tuned independently and electronically over the wide range by adjusting the external bias currents. The circuit possesses low active and passive sensitivity performance. The validity of proposed filter is verified through PSPICE simulations.

An Electronically Tunable SIMO Biquad Filter Using CCCCTA

This paper presents an electronically tunable single input multiple output (SIMO) biquad filter using current controlled current conveyor transconductance amplifiers (CCCCTAs). The proposed filter employs only two CCCCTA and three capacitors out of which two are permanently grounded. The proposed filter realizes low pass (LP), band pass (BP) and high pass (HP) responses in voltage form as well as in transadmittance form simultaneously. The circuit can also realize band reject (BR) as well as all pass (AP) responses in transadmittance form, with interconnection of relevant output currents. The circuit enjoys an independent current control of pole frequency and bandwidth as well as quality factor and bandwidth. Both the active and passive sensitivities are no more than unity. The validity of proposed filter is verified through PSPICE simulations.

Single MO-CCCCTA-Based Electronically Tunable Current/Trans-Impedance-Mode Biquad Universal Filter

This paper presents an electronically tunable current/trans-impedance-mode biquad universal filter employing only single multi-output current controlled current conveyor trans-conductance amplifier (MO-CCCCTA) and two grounded capacitors. The proposed filter realizes all the standard filter func-tions i.e. low pass (LP), band pass (BP) and high pass (HP), notch and all pass (AP) filters in the current form at high impedance output through appropriate selection of the input signals, without any matching conditions. Simultaneously, it can also realize all the standard filter functions in trans-impedance form from the same circuit topology. The circuit does not require inverting-type input current signal(s) and double input current signal(s) to realize all the responses in the design. The validity of proposed filter is verified through PSPICE simulations.

Novel Electronically Tunable Mixed-Mode Biquad Filter

This paper presents a novel electronically tunable mixed-mode biquad filter. The proposed filter employs only three multi-output current controlled current conveyor trans-conductance amplifiers (MO-CCCCTAs) and two grounded capacitors. With the current as an input, the proposed filter can realize low pass (LP), band pass (BP), high pass (HP), band reject (BR) and all pass (AP) in current-mode and LP, BP and BR responses in trans-impedance-mode. When the voltage acts as an input, the proposed filter can realize LP, BP, HP, BR and AP responses in trans-admittance-mode and LP, BP and BR in voltage-mode. Moreover, the filter also offers the feature of quality factor control of independent of pole frequency through only single bias current. PSPICE simulation results are included for verification of the proposed circuit.

Single CCCCTA-based SITO biquad filter with electronic tuning

In this paper a new single-input three-output (SITO) electronically tunable voltage-mode biquad filter using single current controlled current conveyor trans-conductance amplifier (CCCCTA) is proposed. The proposed voltage-mode filter employs only one resistor and two grounded capacitors as passive elements and can simultaneously realize low pass (LP), band pass (BP), and band reject (BR) filter functions. The circuit possesses low active and passive sensitivity. The effects of parasitic and non-idealities are also considered. PSPICE simulation results are included for verification of proposed circuit.

High input impedance SIMO versatile biquad filter

This paper presents a new Single Input Multiple Output (SIMO) versatile biquad Filter based on fully differential current conveyor (FDCCII). The filter uses grounded passive components suitable for monolithic implementation. The proposed circuit realizes all the standard filter functions in voltage and current form, that is, high-pass, band-pass, low-pass, notch, and all-pass filters simultaneously without changing the passive elements. PSPICE simulation results are given to verify the proposed circuit.

Electronically Tunable Current-Mode Universal Biquad Filter Based on the CCCCTA

This paper presents an electronically tunable current-mode universal biquad filter based on the current controlled current conveyor transconductance amplifiers (CCCCTAs). The proposed filter employs only three CCCCTAs, two capacitors one of which is permanently grounded. The proposed filter realizes low pass (LP), band pass (BP) and high pass (HP) responses simultaneously. The filter can also realize regular notch and all pass(AP) responses with interconnection of relevant output currents. The low pass notch (LPN) and high pass notch (HPN) responses can also be realize without passive component matching conditions. The circuit enjoys an independent current control of pole frequency and bandwidth . Both the active and passive sensitivities are no more than unity. The validity of proposed filter is verified through PSPICE simulations.

Fully integrated electronically tunable universal biquad filter operating in current-mode

A new current-mode universal filter structure consisting of three current-follower transconductance amplifiers (CFTAs) and two grounded capacitors is described in this paper. By the proper selection of three current input (s), it can realize all the five standard filtering responses namely, low pass (LP), band pass (BP), high pass (HP), band reject (BR), and all pass (AP) at single high impedance current output terminal. Thus, the proposed biquad structure is a multi-input single-output type filter configuration. It offers number of remarkable features such as wide range of orthogonal electronic tunability of filter parameters, capability to realize various filtering responses without using inverted current input signal(s) and low sensitivities with respect to active and passive components. The circuit performance is examined through P-SPICE simulation on ORCAD tools.

Current tunable current-mode TISO biquad filter consisting of two MCFTAs and minimum number of grounded capacitors

This paper introduces a new current tunable current-mode biquad filter topology which is based on the active elements namely, modified current follower transconductance amplifiers (MCFTAs) and two grounded capacitors. It can realize all the five standard filtering responses such as band pass (BP), low pass (LP), high pass (HP), band reject (BR), and all pass (AP) at single high impedance current output through appropriate selection of three applied current inputs. So this circuit is three input single output (TISO) current-mode filter topology. The circuit offers an advantage of wide range of orthogonal electronic tunability of pole-frequency and quality factor and capable of realizing various filtering responses without using inverted and double current input signal. Moreover, the circuit also provides low active and passive sensitivities. Performance of the circuit is verified through P-SPICE simulation on ORCAD tool.