Electronically Tunable Resistorless Mixed Mode Biquad Filters

This paper presents a new realization of elec¬tronically tunable mixed mode (including transadmittance- and voltage-modes) biquad filter with single input, three outputs or three inputs, single output using voltage differ-encing transconductance amplifier (VDTA), a recently introduced active element. It can simultaneously realize standard filtering signals: low-pass, band-pass and high-pass or by selecting input terminals, it can realize all five different filtering signals: low-pass, band-pass, high-pass, band-stop and all-pass. The proposed filter circuit offers the following attractive feature: no requirement of invert-ing type input signal which is require no addition circuit, critical component matching conditions are not required in the design, the circuit parameters ω0 and Q can be set orthogonally or independently through adjusting the bias currents of the VDTAs, the proposed circuit employs two active and minimum numbers of passive components. Fur-thermore, this filter was investigated from the point of view of limited frequency range, stability conditions, effects of parasitic elements and effects of non-ideal and sensitivity. Thus, taking these effects and conditions into considera¬tion, working conditions and boundaries of this filter are determined. We also performed Monte Carlo, THD and noise analyses. Simulation results are given to confirm theoretical analyses

Electronically Tunable SIMO type Mixed-mode Biquadratic Filter using Single FTFNTA

629-637In this manuscript, a new electronically tunable single input multiple output (SIMO) type a mixed-mode biquad filter is proposed. It is made up of a single Four Terminal Floating Nullor Transconductance Amplifier (FTFNTA) as an Active Building Block, one resistor, and two grounded capacitors. So, the presence of grounded capacitors renders the circuit compatible for IC development. As it is a SIMO type structure so no matched inputs are required. Also, the matching of passive components is not an issue with this design. For current as an input, the proposed design can generate current mode (low-pass, high-pass, and band-pass) filters as well as transimpedance mode (band-pass and inverting low-pass) filters. Similarly, when given a voltage as input, it can generate voltage mode (high-pass and inverting band-pass) filters as well as transadmitance mode (inverting band-pass and inverting high-pass) filters at the same time. The pole frequency (ω0) and quality factor (Q0) of designed filters can be tuned electronically through a grounded capacitor without disturbing the bandwidth (ω0/Q0). The effectiveness of the proposed design is checked through PSIPCE simulation. Monte Carlo, sensitivity, and noise analysis are also performed to ensure the robustness of the proposed design

Electronically Tunable SIMO type Mixed-mode Biquadratic Filter using Single FTFNTA

In this manuscript, a new electronically tunable single input multiple output (SIMO) type mixed-mode biquad filter is proposed. It comprises of single Four Terminal Floating Nullor Transconductance Amplifier (FTFNTA) as an Active Building Block, one resistor, and two grounded capacitors. The proposed design can generate current mode (low-pass, high-pass, and band-pass) filters and transimpedance mode (band-pass and inverting low-pass) filters simultaneously for current as an input. Similarly, for voltage as input, it can generate voltage mode (high-pass and inverting band-pass) filters and transadmitance mode (inverting band-pass and inverting high-pass) filters simultaneously. The pole frequency (ω0) and quality factor (Q0) can be tuned electronically as well as through a grounded capacitor without disturbing the bandwidth (ω0/Q0). Design is independent from the input as well as passive component matching constraint. The presence of grounded capacitors makes the circuit feasible for IC realization. The functionality of the proposed design is validated through PSIPCE simulation. To check the robustness of the proposed design Monte Carlo, sensitivity, and noise analysis is also performed

Multi mode Resonator based Concurrent Triple band Band pass Filter with Six Transmission Zeros for Defence Intelligent Transportation Systems Application

A compact and highly selective triple-band bandpass filter (BPF) is designed and presented in this paper. Proposed filter offers low insertion loss, and passband characteristics is achieved by using two coupled MMR multi-mode resonators (MMR1 and MMR2) and an inverted T and circular shape MMRs. The filter operates at frequency 2.43 GHz (Vehicular Communication), 5.91 GHz (ITS band), and 8.86 GHz (satellite communication band). The simulation and measurement results show a minimum insertion loss of 1.6 dB, 0.73 dB, and 2.8 dB for triple-band BPF. The return loss is found to be greater than 13.06 dB, 28.6 dB, and 21.55 dB. It is noted that measurement results are in accordance with the result of electromagnetic simulation. Desired triple-band multi-mode resonators (MMRs) filter characteristics are achieved with six transmission zeroes (TZs). The filter comprises of MMRs which provide small size and control over the spurious frequency. By using a parallel-coupled microstrip line, the first and third passbands are realised. Whereas by using an end-coupled microstrip line, the second passband is recognised. At the input and output ports, the resonator coupling technique is used. By using the anti-parallel microstrip line arrangement, the transmission zero is acquired. The dimensions of the designed filter are 25×16 mm 2

A novel triangular wave quadrature oscillator without passive components for sinusoidal pulse width modulation DC-AC power conversion

In this study, a low-cost quadrature triangle oscillator using a voltage-controlled closed-loop dual operational amplifier (Op-Amp) architecture is proposed. Unlike other typical designs, this oscillator does not require any passive components. The use of an Op-Amp-based circuit is attractive for a triangle oscillator because it is more cost-effective than a microcontroller-based solution. This is especially true for sinusoidal pulse width modulation (SPWM) DC-AC power conversion applications. The slew-rate restriction of an Op-Amp is a useful characteristic for producing a triangle waveform when seen from the perspective of wave shaping techniques. The MC4558 and the JRC4558D are two examples of dual Op-Amps that are evaluated, contrasted, and described in this article. At supply voltages of +7 V and -7 V, the suggested quadrature triangle oscillator that uses Op-Amps MC4558 and JRC4558D has the same oscillation frequency, which is 63 kHz, as demonstrated by simulation and experimental data. The frequency stability is estimated to be around 0.23%. In addition, the findings from the experiment demonstrate that the proposed oscillator is a practical solution for the SPWM DC-AC power conversion application

A Novel Mixed-Mode Current-Controlled Current-Conveyor-Based Filter

A new mixed-mode biquad circuit is presented. The circuit uses four dual-output second-generation currentcontrolled current-conveyors (DOCCCIIs) and two grounded capacitors and can realize lowpass, highpass, bandpass and notch responses from the same topology. The circuit can be driven by voltage or current and its output can be voltage or current. The parameters ωo and ωo /Qo enjoy independent electronic tunability. Simulation results are included

Compact Wideband Hybrid Filters in Rectangular Waveguide With Enhanced Out-of-Band Response

[EN] This paper describes the design procedure of a compact wideband waveguide filter, based on stepped impedance resonators (SIR) and a combined usage of capacitive and inductive coupling irises, that provides a significant improvement in the out-of-band response of the filter with respect to the state-ofthe- art. In addition to theory, several filter prototypes have been designed and manufactured. A detailed sensitivity analysis has been also carried out. Finally, simulations and measurements are compared, showing very good agreement, thereby fully validating the new filter topology.This work was supported in part by the Ministerio de Economia y Empresa (MINECO) (Spanish Government) through the R&D Project under Grant TEC2016-75934-C4-1-R and in part by Generalitat Valenciana through Santiago Grisolia under Grant GRISOLIA/2017/073.Valencia-Sullca, JF.; Boria Esbert, VE.; Guglielmi, M.; Cogollos, S. (2020). Compact Wideband Hybrid Filters in Rectangular Waveguide With Enhanced Out-of-Band Response. IEEE Transactions on Microwave Theory and Techniques. 68(1):87-101. https://doi.org/10.1109/TMTT.2019.2947911S8710168